EMCJ99-1
(1999-04)
Comments on
Epidemiologic Papers Related to Childhood Leukemia and Magnetic Fields of Power Lines (Part 6) - On Assessments of Epidemiologic Papers in
the Draft of the RAPID Program, June 1998 -
Yoshifumi Amemiya
Kanazawa Institute
of Technology
Kanazawa-South
Ishikawa-ken 921-8501 Japan
Abstract: It is a matter of concern for those who reside in
the neighborhood of power lines whether EMFs is a possible human carcinogen. A divided panel of the National Institute
of Environmental Health Sciences (NIEHS) published a draft by WG organized by the NIEHS with support of the EMF
Research and Public Information Dissemination (EMFRAPID) Program, and stated that EMFs should be considered a possible
cause of cancer. The WG could not consider that the EMFs is carcinogenous in animal and cellular experiments. The
WG's opinions were divided as to an assessment of epidemiologic papers, and the WG voted 19 to 9 to power line
EMFs as a possible cause of cancer. But a measure of the assessment is not obvious in this draft; the WG took no
account of the authors' assessments to be no problem for public health in their investigations. In this paper,
we review the assessments in this draft on the related epidemiologic papers for childhood leukemia.
Index terms:
magnetic field /childhood leukemia/cancer /RAPID Program /epidemiology
EMCJ99-2
(1999-04)
A condition
of addition between 1/f Noise Phenomena
Masanobu Ban
Tokyo Metropolitan
Southern District Small and Medium-sized Business Promotion Center
1-20-20 Minamikamata,
Ohta, Tokyo, 144-0035, Japan
Abstract: Since the discovery of l/f noise by Johnson, generated
from cathode rays several l/f noises have been found in physical phenomena that is regarded as movement of a flowing
particle. This is considered as there will be a squarewave and an integrator, because it has l/f noise frequency
characteristics. Then it become clear that will be made by the addition of the waves which were similar and
the same squarewave. When the addition had happened, the wave was limited to only a squarewave which stood alone.
The wave doesn't have the alternating current ingredient that can be always observed, but I can explain contradiction
of observation by transition probability. Because the transition probability and the squarewave that related to
momentum and kinetic energy which is derived from perturbation about time of quantum mechanics. Actually the example
that showed a characteristic of a squarewave is found.
Index terms:
l/f noise, power spectrum, Fourier integrals, squarewave, transition probability, orthogonal functions
EMCJ99-3
(1999-04)
Improvements
of a SAR Estimation Method Based on Temperature Measurement
Osamu Kagaya*, Soichi Watanabe*, Satoko Omura*, Toru Uno*,
Koichi Ito***, and Yukio Yamanaka**
*Tokyo University
of Agriculture and Technology
**Communications
Research Laboratory, M.P.T.
***Chiba University
*2-24-16 Nakamachi,
Koganei-shi, Tokyo, 184-8588, Japan
Abstract: SAR estimation methods based on temperature measurement
are used for biological studies using laboratory animals exposed to electromagnetic field (EMF). In this report,
some improvements of the SAR measurement method are presented. The emissivity of the phantom is determined by using
a temperature and humidity-controlled chamber with higher accuracy and repeatability than by the ordinary method.
The most appropriate exposure conditions are also investigated for solid phantoms with different shape and different
thermal properties.
Index terms:
Exposure setup, SAR, temperature measurement, phantom, emissivity, thermal conduction
EMCJ99-4
(1999-04)
Characteristic
Improvement of Balance Mode in Common Mode Choke Coil for High Frequency
Fumishiro Tsuda, Shinichi Shinohara, and Risaburo Sato
Electromagnetic
Compatibility Research Laboratories Co. , Ltd.
6-6-3, Minamiyoshinari
Aoba-ku, Sendai, 989-3204 Japan
Abstract: Common mode choke coil (CMC) is used to suppress
the common mode current become a factor of the electromagnetic radiation noise. We researched CMC for a GHz band.
In this frequency area, a transmission loss increase in the balance mode becomes a problem simultaneously with
the effect of suppression of common mode current. In this report, CMC with the transmission line structure was
examined by combining the capacity of two lines and the magnetic circuits for the transmission loss improvement.
CMC that the loss is few was obtained in the high frequency area by matching the characteristic impedance of the
balance mode with the insertion system of CMC.
Index terms:
Balance Mode, Common Mode, Characteristic impedance, Magnetics
EMCJ99-5
(1999-04)
The Estimation
of Current and Voltage Distributions by Using a Small Size Probe
Satoshi Kazama, Shinichi Shinohara, and Risaburo Sato
Electromagnetic
Compatibility Research Laboratories Co., Ltd.
6-6-3 Minamiyoshinari
Aoba-ku Sendai-shi 989-3204
Abstract: In this paper, the estimation method of current
and voltage distributions by scanning a probe is proposed. This method uses the phenomenon that the coupling between
the current and the probe is varied by the probe direction. Actually, the current and voltage are estimated by
calculating the probe vector output at four directions. Therefore, both current and voltage vector distributions
can be estimated at the same time by one probe. The current and voltage distributions in a digital IC package by
this method are estimated. And, the method is investigated by using these estimated results. The probe used in
this method seems to be able to reduce its size, because it has simple structure.
Index terms:
Current distribution, Voltage distribution, Estimation. Digital IC, Small size probe
EMCJ99-6
(1999-04)
Manufacturing
Method of Sandwich-Type Magnetic Wood and its Application to Electromagnetic Wave Absorber
Koichi Narita and Hideo Oka
Graduate School
of Electronic and Electronical Engineering, Iwate University
3-4-5, Ueda,
Morioka, 020-8551, Japan
Abstract: The purpose of this article is to examine the possibility
of using sandwich-type magnetic wood as an electromagnetic wave absorber. The sandwich-type magnetic wood (two
piece of wood boards are pressed with sandwiched magnetic adhesive) has better electromagnetic wave absorb characteristic,
small weight difference according to the part and woody surface compare to previously reported magnetic woods.
This article covers experimental electromagnetic wave absorbs characteristic for sandwich-type magnetic wood when
using different parameters. The results show that the sandwich-type magnetic wood, which made with 40vol% mixture
of Ni-Zn ferrite with particle diameter of 355ľm and 3mm layer of magnetic adhesive has good reflection loss. It
has 20dB reflection loss under 1.55GHz.
Index terms:
electromagnetic wave absorber, magnetic wood, EMC, interior material, magnetic power, composite functional material
EMCJ99-7
(1999-04)
Dynamic Response
for Impulse Noise on Vcc Line of Asymmetrical Noise Immunity Flip-Flop
Tsuneo Tsukagoshi *, Shuichi Nitta**, and Atsuo Mutoh**
*NEC Corporation
EMC Engineering Center
**Department
of Mechanical system Engineering, Tokyo Univ. of Agriculture & Technology
*4-1-1 Miyazaki
Miyamae-ku, Kawasaki-shi, 216-8555, Japan
**2-24-16 Naka-cho,
Koganei-shi, Tokyo, 184-8588, Japan
Abstract: Dynamic responses for impulse noise on power supply
line (Vcc) of asymmetrical noise immunity Flip-flop with two transistors are investigated to clarify its malfunction
mechanism. By analyzing the time constant of RC circuit which controls base current of initially saturated transistor,
it is revealed that the reversal action of output Q is caused by inverse current of collector resistor of cutoff
transistor (RC l ). The inverse
current of Rc1 is generated
by abrupt voltage drop of Vcc line which occurs at the end of positive impulse noise and the beginning of negative
impulse noise.
Index terms:
flip-flop, asymmetrical noise immunity, noise on power supply line, impulse response
EMCJ99-8
(1999-06)
Electromagnetic
Induction Characteristics of Twisting Pairs
Satoshi Onishi* and Ken-Ichi Hayashi **
*Canare Electric
Corp.
**Aichi Institute
of Technology
*Canare Buil,2-2-10
Asakusabashi
Taitou-Ku Tokyo 111-0053
**1247 Yachigusa
Yagusa Toyota-City Aichi-Ken 470-0392
Abstract: Balanced pair cables are commonly twisted since
the reduction of electromagnetic induction is preferred. When there are electric currents in cable wires, the effect
of shielding is considered by how much magnetic-flux produced near the cable. We obtained the each flux densities
produced by the five kinds of twisted cables, that is twisting, pairs composed of one, two, three, four or six
element-wires. The shielding effect of each pair is evaluated by the amount of magnetic flux induction generated
by pairs. The one-wire twisting cable corresponds to one-element cable in the case of twisting state. In the case
of many composed twisting wires, the amount of magnetic flux is possible to obtain by means of superposition of
this one-wire twisting element. The three-wires twisting cables that are used widely in industrial field are composed
by three wires and one wire of them is assigned to earth line. Increasing the number of composed-wires means the
improvement of electromagnetic property of the cable.
Index terms:
Balanced pair cables reduction of electromagnetic induction effect of shielding, flux densities
EMCJ99-9
(1999-06)
Computation
of Classical Site Attenuation using FDTD Method
Masayuki Mitsuzawa, Toshiyuki Karube, and Jun-ichi Miyashita
Precision Technology
Research Institute of Nagano Prefecture
9959 Okaya-City,
Nagano 394-0000
Abstract: We made a program to calculate classical site attenuation
using FDTD method and compared the result with the theoretical value. For absorbing boundary condition, we use
Mur's secondary one. And calculated frequency range is from 30MHz to 300MHz. AS the result, in the convergence
time the calculated value has fairly difference between theoretical one because of the reflection from the absorbing
boundary. But at the initial time with no reflection there is a good agreement with calculated value and theoretical
one.
Index terms:
FDTD method, Classical Site Attenuation, Electromagnetic Field Analysis, EMC
EMCJ99-10
(1999-06)
Investigation
of Measuring Accuracy and Means of Improvement in EMI Measuring System without antenna below 1GHz
Hiroshi Nakajima
Fuj i Xerox
Co., Ltd.
2274 Hongo Ebina-Shi,
Kanagawa-Ken 243-0494 Japan
Abstract: As we were doubting about the linearity of the measuring
EMI level against the emitted EMI level of EUT, we have investigated the linearity in EMI measuring system (without
antenna) of 4 sites below 1GHz. It is easy to investigate the linearity of EMI measuring system without antenna,
as the output level of antenna can be simulated by the output level of standard signal generator using signal generator
instead of antenna. We found that the deviation from linear curve are greater than not only the measuring error
of measuring method of linearity but also the tolerance of accuracy required by CISPR 16-1 in the EMI measuring
system of all sites investigated. So, we study the means to keep the deviation from the linear curve within the
tolerance of CISPR16-1 in the range of the simulated EMI level between VCCI class B level and class B minus 6dB
level and we have introduced actually in a EMI measuring system of certain site.
Index terms:
linearity, deviation, measuring accuracy, NF, SN ratio, preamplifier
EMCJ99-11
(1999-06)
A Study on
Electromagnetic Spatial Distribution Radiated from a PCB
Takashi Kasuga*, Motoshi Tanaka*, Takashi Komakine**, and
Hiroshi Inoue*
*Department
of Electrical and Electronic Engineering, Faculty of Engineering and Resource Science, Akita University
**Akita Research
Institute of Advanced Technology
*1-1 Tegata
Gakuen-machi, Akita 010-8502 Japan
**4-21 Sanuki,
Araya, Akita 010-1623 Japan
Abstract: In this paper for the modeling about electromagnetic
transmission, comparison with close field spectrum and electric field distribution radiated from a printed circuit
board (PCB) is discussed. Close field spectrum and line impedance was compared by the calculation using FDTD-method.
It is clear that close field spectrum has relationship with characteristic of line impedance, because dip around
430 MHz of close field spectrum agrees with maximum of line impedance. So as to model on far field transmission,
electric field distribution was measured in the anechoic chamber. As the antenna is move away father from the PCB,
the amplitude of the electric field decreases, but spectrum pattern did not change. When close field spectrum compared
with electric field distribution, close field spectrum did not agree with electric field at lower frequency range.
So, it is clear that electromagnetic distribution should be simulated more in detail.
Index terms:
close field spectrum, line impedance, electric field distribution, FDTD-method, anechoic chamber
EMCJ99-12
(1999-06)
Pseudo Noise
Generator with Arbitrary Amplitude Probability Distribution
Koji Yamane* Takashi Shinozuka* and Koichi Ohnuma**
*Electromagnetic
Compatibility Research Laboratories Co., Ltd.
**Tohoku Gauin
University
*6-6-3 , Minami-Yoshinari,
Aoba-ku,Sendai, 989-3204 Japan
**1-13-1, Chuo,
Tagajyo-city, 985-8537 Japan
Abstract: We developed the pseudo noise generator according
to specified amplitude probability distribution (APD) and evaluated the performance. This device generates the
M-bit binary random numbers by using the binary-tree search techniques based on the conditional probability calculated
from specified APD. Three types of pseudo noise which have uniform distribution, normal distribution and special
distribution specified with microwave oven (MWO) noise are evaluated by measuring those statistical parameters
as APD, CRD and PDD. This device generated the pseudo noise which corresponded exactly to specified APD. Moreover
we confirmed that the independently occurred pseudo noise also corresponded well to theoretical CRD, PDD. However
the pseudo noise specified APD of MWO noise did not give the CRD, PDD characteristics of actual MWO noise for the
reason of time correlation.
Index terms:
Pseudo noise generator, amplitude probability distribution, crossing rate distribution, pulse duration distribution
EMCJ 99-13
(1999-06)
A Simulating
Method for Random Noise Controllable of APD and CRD Characteristics
Koichi Ohnuma*, Shinya Tomitsuka*, Koji Yamane **, and Takashi
Shinozuka**
* Faculty of
Engineering, Tohoku Gakuin University
** Electromagnetic
Compatibility Research, Laboratories Co., Ltd.
* 1-13-1, Chuo,
Tagajo, 985-8537
** 6-6-3, Minamiyoshinari,
Aoba-ku, Sendai, 989-3204
Abstract: A simulating method for pseudorandom noise controllable
of two kinds of fundamental statistical characteristics, that is an amplitude probability distribution (APD) and
a crossing rate distribution (CRD), is described. The principle of this method is to generate the random numbers
having the required CRD characteristics, and then to control the interval of the numbers by the required APD characteristics.
For the use of digital techniques , the programmable pseudorandom noise generator based on this principle can be
built up by only digital circuits except a digital to analog converter of final stage. Therefore, it is easy to
repeat the measurements by using the generator.
Index terms:
pseudorandom noise, statistics, APD, CRD, arbitrary random number DA conversion
EMCJ99-14
(1999-06)
Near Field
Shielding Effect for Oval Human Model using High Loss Magnetic and Dielectric Materials
S. NISHIZAWA and O. HASHIMOTO
Department of
Electrical and Electronic Engineering, Graduate School of Science and Engineering, Aoyama Gakuin University
6-16-1 Chitosedai
Setagaya-ku, 157-8572 Tokyo, Japan
Abstract: In this paper, the high loss magnetic and dielectric
material are selected as the shield material, and the shielding effect of these materials itself, and also by locating
these materials in front of the oval human model are investigated for near and far field exposure, using the half
wave-length dipole antenna. According to the results, the magnetic material shows a large shielding effect (20dB),
compared to dielectric material at the distance of 0.5É, which is able to be considered to the plane wave shield. Also the reduction of the shielding
effect was small (2dB) for magnetic material, on the other hand large for the dielectric material, by decreasing
the distance between the antenna and shield. Moreover, by locating the magnetic material in front of the human
model, the variation of the shielding effect compared with the humanless result was small (0.2-1.5dB), for the
gap distance between the human and shield, on the other hand, large for the dielectric material.
Index terms:
High Loss MagnetiDielectric Material, Oval Human Model, É /2 Dipole Antenna, Near-field Shield, FDTD
EMCJ99-15
(1999-06)
A Novel Exposure
Setup of Small Aninlal Locally Exposed to Near Fields for Biological Effect Tect of Cellular Telephones
Osamu Fujiwara*, Jianqing Wang*, Takashi Saito*, Yasuo Hashimoto**,
So-ichi Watanabe***, and Yukio Yamanaka***
*Department
of Electrical and Computer Engineering, Nagoya Institute of Technology
**TDK Corporation
***Communications
Research Laboratory
*Gokiso-cho,
Showa-ku, Nagoya 466-8555, Japan
**Higashi-ohwada,
Ichikawa, Chiba 272-8558, Japan
***Nukui-kitamachi,
Koganei, Tokyo 184-8795, Japan
Abstract: A novel in vivo exposure setup has been developed
for testing possible promoting effects of 1.5 GHz digital cellular phones on mouse skin carcinogenesis. The exposure
setup possesses two main features. One of the features is the employment of an electrically short monopole antenna
with capacitive-loading, which supplies the ability to realize a highly localized peak SAR above 2 W/kg under a
whole-body-averaged SAR below 0.08 W/kg for a mouse. Another feature is the adoption of transparent absorber, which
supplies the ability to observe the exposure process as well as mouse activities during the exposure. Dosimetric
analyses for the exposure setup have been carried out both numerically and experimentally. A fair agreement between
the numerical and experimental results have been confirmed, which verifies the validity of the novel exposure setup.
Index terms:
Cellular telephone, biological effect, in vivo exposure setup, mouse, transparent absorber
EMCJ 99-16
(1999-06)
Dosimetry and
Its Dependence of Irradiation Direction in MRI Based Head Model for 1.5GHz
Microwave Far-fields
Takuji USHIMOTO, Jianqing WANG, and Osamu FUJIWARA
Faculty of Engineering,
Nagoya Institute of Technology
Gokiso-cho,
Showa-ku, Nagoya 466-8555, Japan
Abstract: Public concerns regarding potential health hazards
due to microwaves radiating from the communication towers for cellular phones, have been growing. In order to examine
the dependence on irradiation direction of SAR (specific absorption rate) inside the head for microwave far-field
exposure, we conducted dosimetric computations using a newly-developed MRI (Magnetic Resonance Imaging) based head
model. The FD-TD (finite-difference time-domain) method was used to compute the local SARs in the head for 1.5GHz
far-fields with 1.0 mW/cm2.
Dosimetric comparison with the results for our previously developed head model was also made.
Index terms:
Microwave far-fields, dosimetry, FDTD analysis, MRI based head model, dependence of irradiation direction
EMCJ99-17
(1999-07)
Researches
on EMC Problems on Printed Circuit Boards Presented at 1999 International Symposium on Electromagnetic Compatibility
(EMC '99/ TOKYO)
Osami WADA and Ryuji KOGA
Faculty of Engineering,
Okayama University
3-1-1 Tsushima-naka,
Okayama
Abstract: The fourth International Symposium on Electromagnetic
Compatibility in Japan (EMC'99/ TOKYO) was held on May 17-21, 1999, at Surugadai Memorial Hall, Chuo University
.
Within 200 regular papers, including invited papers, 31 papers are presented at Sessions "Printed Circuit
Boards (1)-(4)" . The authors classifies the papers into categories of 'power system on PCB', 'simulation',
'imperfect ground plane on a PCB and common mode', 'others', and review the research trends related to EMC design
of PCBs.
Index terms:
printed circuit board, EMC, international symposium, review
EMCJ99-18
(1999-07)
Application
of Fuzzy Logic in EMC Constraint PCB Design
Ang Teck Lin, Yuji Tarui*, Takashi Sakusabe, Takehiro Takahashi,
and Noboru Schibuya
Department of
Computer Science, Takushoku University
*Department
of Management and Information Science, Jobu University
Tatemachi 815-1,
Hachioji, Tokyo 193-8585, Japan
Abstract: Application of fuzzy logic structures in the EMC
constraint PCB design substantially improves quality of design solutions by providing designers with flexibility
in layout. Membership function of the fuzzy logic has an advantage for describe complicated rule for EMC constraint.
It is expected that the knowledge and empirical rule are also included with same manner as numerically represented
rule in fuzzy system. Fuzzy logic structures are applied successfully for selection of EMC constraint design solutions
in conjunction with the constructive algorithms.
Index terms:
electromagnetic noise, printed circuit board, design support system, fuzzy logic
EMCJ99-19
(1999-07)
A Simulation
Analysis on the EMI Radiation from a High-speed Clock Net placed at the Card Edge from Electric and Magnetic Dipole
Moments Calculation
Shinichi Ikami
EMC Engineering,
IBM Japan Ltd.
1623- 14, Shimotsuruma,
Yamato-shi, Kanagawaken 242-8502, Japan
Abstract: An analysis was done on the electromagnetic radiation
from the clock net placed near the card edge. The electric and magnetic moments were calculated using the current
distribution obtained by an moment-method based EM solver. It was appeared that by placing the net near the edge,
there arise the common mode currents both in normal and parallel direction of the signal net. Also there arise
loop currents in the PCB ground plane and signal trace. It depends on the termination value. From the analysis
on the current distribution at the instance when its electric and magnetic dipole moments corresponds to its maximum
value, the mechanism of generation of each common and differential mode current is studied.
Index terms:
EMI simulation, Common mode radiation, Differential mode radiation, PCB wiring
EMCJ99-20
(1999-07)
Modeling and
Analysis on Pass-through Current Decoupling Method for Multi-layer Printed Circuit Board
S. Fujio, H. Momijiyama, and A. Sakurai
EMC Engineering,
Yamato Laboratory IBM Japan Ltd.
1623-14 Shimotsuruma,
Yamato-shi, Kanagawa 242-8502 Japan
Abstract: It is well known that pass-through current, caused
by an IC during its output transient state, can be one of dominant sources of the radiated field from the printed
circuit board (PCB). In this paper, a modeling method is proposed to analyze this problem with a full-wave electromagnetic
simulator. An analysis on the decoupling method, specifically for the case which the IC is placed on a multi-layer
PCB with a segmented power island over a ground plane structure, has been carried out and found that there is close
relationship between the PCB layer structure and the adequate location of the decoupling capacitors. Measurements
have also been done with experimental model and the results are presented.
Index terms:
EMI, Simulation, Modeling, Pass-through Current, Decoupling
EMCJ99-21
(1999-07)
Reduction of
Power and Ground Plane Radiation in Printed Circuit Board Using Capacitors
Osamu Ueno, Daisuke Iguchi, and Hitoshi Arakaki
Advanced Technology
Development Center, Fuji Xerox Co., Ltd.
2274 Hongo,
Ebina-shi, Kanagawa 243-0494, Japan
Abstract: Power and ground planes are one of the most important
noise sources in printed circuit boards. This report discusses a noise reduction method using capacitors and shows
that a good combination of board-edge capacitors and near-IC capacitors decreases the power and ground plane radiation
without exciting other noise. The condition of the edge capacitor is clarified using the moment method simulation
and the transmission line theory.
Index terms:
EMI, PCB, Power, Ground, Resonance, Capacitor, Method of Moment
EMCJ99-22
(1999-07)
Analysis of
Radiation Noise Causeed by Power Distribution on Multilayer Printed Circuit Board
Tsutomu Hara, Mariko Kasai, Hitoshi Yokota*, and Atsushi Nakamura**
Systems Development
Laboratory, Hitachi, Ltd.
* PC Division,
Hitachi, Ltd.
** Semiconductor
and Integrated Circuits Group, Hitachi, Ltd.
292 Yoshida-cho,Totsuka-ku,
Yokohama, 244-0817, Japan
*810 Shimoimaizumi,
Ebina-shi, Kanagawa 243-0435, Japan
**20-1, Josuihoncho
5-chome, Kodaira-shi, Tokyo 187-8588, Japan
Abstract: In this paper, the mechanism of radiation noise
from power-bus of printed circuit board was investigated, and an evaluation method and a simple approximate model
were induced. Radiation noise from the power-bus has two causes: (1) resonance due to power and ground shapes of
a printed circuit board; and (2) resonance due to IC's electrical characteristics.
Index terms:
Printed Circuit Board, Power-bus, IC, Scattering parameter, Cavity resonance
EMCJ99-23
(1999-07)
Magnetic Near
Field Detection using Thin-Film Shielded Loop Coil
Hiroyuki Yurugi, Shin Yabukami, Masahiro Yamaguchi, Ken-Ichi
Arai, Norio Masuda*, Naoya Tamaki*, and Hirokazu Tohya*
Research Institute
of Electrical Communication, Tohoku University
*EMC Engineering
Center, Device Analysis Technology Laboratory, NEC Corporation
2-1-1 Katahira,
Aoba-ku, Sendai, Miyagi, 980-8577 Japan
*4-1-1, Miyazaki,
Miyamae-ku, Kawasaki, Kanagawa, 216-8555 Japan
Abstract: This paper proposes a new miniature thin-film coil
whose area is down to 25ľm x 110ľm to sense magnetic near field from PCBs (Printed Circuit Boards) or ICs. The
proposed coil has multi-layer planar shielded loop structure and it is insensitive to electric field. Spatial resolution
of 300ľm was obtained using the coil at 800MHz. This value is about 3 times better than the PCB-made type we have
already presented. Magnetic field distribution near the LSI packaged on PCB has been demonstrated.
Index terms:
thin-film, shielded loop coil, EMC, Magnetic near field detection, high spatial resolution, micro magnetic device
EMCJ99-24
(1999-07)
Effect of Insertion
Position of Noise Suppression Devices for Induced Voltage Caused By External Electromagnetic Field.
Hidetoshi Yamamoto, Shinichi Shinohara, and Risaburo Sato
Electromagnetic
Compatibility Research Laboratories Co., Ltd .
6-6-3, Minami-yoshinari,
Aobaku, Sendai, 989-3204, Japan
Abstract: In this paper, the suppression effect of noise suppression
device for induced voltage on printed wire at various insertion point was discussed. The effect was calculated
from transmission theory and results shows good agreement with measured value.
Index terms:
Immunity, Induced voltage, Noise suppression device, Suppression effect
EMCJ99-25
(1999-07)
Investigation
of Diagnosis for Equipment's Malfunction Due to the Cable Induced Common-node Noise Test
Kohji Sasabe, Kazuhisa Yoshida, and Osamu Fujiwara*
Corporate Quality
R&D Center, Matsushita Electric Works, Ltd
*Faculty of
Engineering, Nagoya Institute of Technology
1048, Kadoma,
Kadoma-shi, Osaka 571-8686, Japan.
*Gokiso-cho,
Showa-ku, Nagoya 466-8555, Japan.
Abstract: A simple method for diagnosing the electric equipment's
malfunction by cable induced common-mode noise injection test was proposed, which can contribute to the Printed
Circuit Boards (PCBs) trace designs for common-mode noise. A grading index, which is defined as the ratio of the
stray capacitances with and without critical IC of malfunction, was introduced to distinguish the PCBs susceptible
to the common-mode noise. This proposed method was validated experimentally using four PCBs with the same circuit
but different trace design. It was observed that the noise immunity of PCBs had a good correlation with the values
of these grading indices.
Index terms:
malfunction, diagnosis, common-mode, noise, impedance, capacitive coupling
EMCJ99-26
(1999-07)
EMI Resulting
from High-Speed Routing between Power and Ground Planes
Motoshi Tanaka*, Yimin Ding**, James L. Drewniak**, Todd H.
Hubing**, Hiroshi Inoue*, Thomas P. VanDoren*, and Richard E. DuBroff**
*Akita University
**University
of Missouri-Rolla
*1-1 Tegata
Gakuen-machi, Akita 010-8502, Japan.
**1870 Miner
Circle, Rolla, MO 65409, USA.
Abstract: EMI coupling paths in an automotive controller are
investigated experimentally through common-mode (CM) current measurements on the attached cable, CM vs DM testing,
the effect of a ferrite sleeve on the cable, shielding various portions of the PCB, and, high-speed trace routing
considerations. A methodical means of identifying and characterizing EMI coupling paths in functioning hardware,
and relating them to design features, is demonstrated. Also, fundamental investigations of DC power bus excitation
from interstitial high-speed routing in the layers between the parallel plane power layers are conducted experimentally.
Index terms:
EMI, common-mode current, EMI coupling path, high-speed routing, DC power bus
AP99-67, EMCJ99-27
(1999-08)
Effects of
Airplanes and Rainfall on a Vsat Satellite Communication - Evaluation of Propagation Characteristics Using Plural
Terminals -
Hitoshi Yoshida, Kenichi Ishida, Kiyotaka Fujisaki, and Mitsuo
Tateiba
Dept. of Computer
Science and Communication Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu
University
6-10-1 Hakozaki
Higashi-ku Fukuoka 812-8581
Abstract: Satellite communication experiments using the VSAT
system have been performed at Kyushu University since 1993. At first, we evaluated propagation characteristics
from communication between one earth terminal and the satellite. We have established more terminals one after another
since 1996 and now have five terminals. We constructed experimental system using four terminals of them to evaluate
effects of airplanes and rainfall. In this paper, we describe the experimental system and present the experimental
results.
Index terms:
satellite communication, VSAT, rain attenuation
AP99-68, EMCJ99-28
(1999-08)
Delay Profile
Measurement by the Sector Antenna at the Outdoor
Kohei Mori, Hiroyuki Arai, and Ebine Yoshio*
Faculty of Engineering,
Yokohama National University
*NTT Mobile
Communication Network Inc
79-5 Tokiwadai,
Hodogaya-ku, Yokohama, Kanagawa, 240-8501, Japan
*3-5 Hikari
no oka, Yokosuka, Kanagawa, 239-8536, Japan
Abstract: The delay signal is occurred from multi-path propagation
by a reflection or diffraction. The quality of transmission is deteriorated by the delay signal. This paper presented
a delay profile was measurement by using the sector antenna at the outdoor. We presented the effect such as the
decrease of delay spread by using sector antenna.
Index terms:
Delay profile, Sector antenna Delay spread
AP99-69, EMCJ99-29
(1999-08)
A Novel CMA
Adaptive Array Applicable to DS-SS Systems
Yukihiro Kamiya*, Satoshi Denno*, Yoshihiko Mizuguchi*, Masaaki
Katayama**, Akira Ogawa**, and Yoshio Karasawa***
*ATR Adaptive
Commun. Res. Labs.
**Department
of Information Electronics , Nagoya University
***Department
of Electrical Engineering, The University of Electro-Communications
*2-2 Hikaridai
Seikacho Sorakugun,Kyoto 619-0288 Japan
**Nagoya 464-8603,
Japan
***1-5-1 Choufugaoka,
Choufu-shi, Tokyo 182-8585, Japan
Abstract: Adaptive arrays have been paid attention widely
as an attractive solution for multipath fading in the mobile communication systems. Although many configurations
of the adaptive array and adaptive control schemes are proposed, its complexity prevents it from practical use.
In this paper, we propose novel configuration of the adaptive array which achieves beamforming, equalization and
despreading simultaneously based on CMA algorithm applicable to one-user Spread Spectrum communication systems.
It is expected that it allows us to implement easily due to its simple configuration. The performance is examined
through computer simulations.
Index terms:
DBF/Spread Spectrum system/CMA/mobile communications
AP99-70, EMCJ99-30
(1999-08)
Dual-polarized
Diversity Antenna and the Propagation Characteristic
Xin Zhang, Tsukasa Hiruta, Seiji Kado, Osamu Nitta, and Toru
Watari
Hitachi Cable,
Ltd.
880, Isagozawa
Hitachi-city, Ibaraki, 319-1418, Japan
Abstract: We proposed a vertically polarized wave antenna
that has omnidirectional pattern into a horizontal plane and is applied fro spade diversity. Also, a wideband slot
antenna composed on a dielectric substrate of the narrow width was proposed. We herein propose to compose on a
same plane these 2. Furthermore, 4 diversity antennas by using this polarization diversity antenna were experimentally
produced. The diversity effect was compared with a conventional vertical diversity antenna. This paper reports
antenna characteristics, propagation characteristics and the structure of this polarization diversity antenna.
Index terms:
Microstrip antenna, Dual-polarized, Diversity antenna, Antenna array
AP99-71, EMCJ99-31
(1999-08)
Grating lobe
Suppression for Non-uniform array and its Experiments
Osamu Mizokami, Toshiyuki Nakazawa and Masanori Shinriki
2nd Research
Center, TRDI, Japan Defense Agency
1-2-24 Ikejiri,
Setagaya-ku, Tokyo 154-8511, Japan
Abstract: The array antenna with an uniform space often generates
an grating lobe in the broadband frequency range or in the slant direction. We study a way of the grating lobe
suppression by using an array antenna arrangement with non-uniform space. The suppression effect is verified by
simulations and some experiments, which is given by 15 elements of spiral antennas in the range of 6-18GHz.
Index terms:
Non-uniform, Array antenna, Grating lobe, Broadband
AP99-72, EMCJ99-32
(1999-08)
A Triplate
Line Feed Slot - Coupled Microstrip Antenna with a Via-hole Cavity
Hiroyuki Ohmine, Takeshi Ishida*, Tatsuhiko Suzuki, and Shigeru
Makino
Mitsubishi Electric
Corporation
* Mitsubishi
Electric Engineering Company Limited
5-1-1 Ofuna,
Kamakura, Kanagawa, 247-8501 Japan
Abstract: This paper presents a new configuration of triplate
line feed slot-coupled microstrip antenna with a via-hole cavity which suppresses parallel plate mode . This configuration
has a feature of little influence of input impedance because position of via-holes are apart from the slot and
has an advantage of structural simplicity due to novel use of a LTCC (Low Temperature Co-fired Ceramics) triplate
line. First of all, input impedance characteristics with changing a cavity length are indicated. Next, it is clarified
that there is a optimum cavity size which affect little influence of input impedance. Finally, fabrication and
measurement of this antenna in Ka-band are described , and good performance has been confirmed.
Index terms:
microstrip antenna, electromagnetically coupling, triplate line, cavity, multi-layer ceramic
AP99-73, EMCJ99-33
(1999-08)
Ripples in
the an Aperture Distribution of a Cylindrical Slot-Array Antenna
Kyouichi Iigusa and Masato Tanaka
Communications
Research Laboratory M.P.T.
893-1 Hirai,
Kashima, Ibaraki 314-0012 Japan
Abstract: In an aperture distribution of a slot-array antenna
on a coaxial cylinder calculated from a measured antenna pattern data using the cylindrical near-field antenna
measurement theory, an unintentional ripple appears. The ripple appears in both amplitude and phase distributions,
and its period depends on the shape of the beam pattern. Considering that each element on the cylindrical antenna
surface is excited by the traveling wave in the waveguide, we calculated excited array distribution and far-field
pattern. Then we recalculated the aperture distribution in a way that watched the measured data. In this case too,
a ripple appeared. However, its features were different from those of the one measured in the case of beam tilt
antennas. So, we assumed the existence of another traveling wave in the waveguide, in order to explain the ripple'
s property. We conclude that a reflected wave causes the ripple in the aperture distribution and that it is generated
in the coaxial waveguide of the cylindrical slot array antenna.
Index terms:
ripple, slot array, aperture distribution, reflected wave, cylindrical array, traveling wave antenna
AP99-74, EMCJ99-34
(1999-08)
45-Degree Linearly-Polarized
76GHz Post-Wall Waveguide Fed Parallel Plate Slot Array Antennas
Jiro Hirokawa and Makoto Ando
Dept. of Electrical
& Electronic Eng., Tokyo Institute of Technology
2-12-1 Ookayama,
Meguro-ku, Tokyo 152-8552, Japan
Abstract: New configuration of three slots is proposed to
radiate a 45-degree linearly-polarized wave in post-wall waveguide fed parallel plate slot arrays. The configuration
consists of one tilted radiation slot for desired polarization and two parallel É/2-spaced reflection-canceling slots without radiation in the boresight. Uniform aperture
field is designed in a 76GHz antenna. Good cross polarization level below -25dB is achieved in the boresight. Gain
of 29.8dBi is obtained with 46.4% efficiency in a 5cm-square antenna.
Index terms:
slot antenna, parallel plate waveguide, post, millimeter-wave, linear polarization
AP99-75, EMCJ99-35
(1999-08)
MOM Analysis
of a Waveguide Cross Slot Antenna in Terms of Eigenmodes as the Basis Functions
Takuichi Hirano, Jiro Hirokawa, and Makoto Ando
Dept. of Electrical
& Electronic Eng., Tokyo Institute of Technology
2-12-1 Ookayama,
Meguro-ku, Tokyo 152-8552, Japan
Abstract: In the method of moments of a cross slot, we propose
use of eigenmode functions of an X-shaped waveguide with its cross section as the basis functions. The reaction
in the waveguide wall region can be easily evaluated as a function of the wall thickness and the cutoff wavenumbers
of the eigenmodes according to the orthogonality. This method predicts accurately the flow of the magnetic current
in the crossing part of the slot. The calculated results have good agreements with the measured ones in the transmission
coefficient and the radiation patterns.
Index terms:
cross slot, slot antenna, waveguide, method of moments, finite element method, circularly polarized wave
AP99-76, EMCJ99-36
(1999-08)
Analysis for
Wide-Angle Radiation Patterns of Three-Dimensional Radome Antennas Taking Account of Reflection by Radome Surface
Hiroyuki Deguchi, Isamu Chiba, Shuji Urasaki, and Ryuji Ishii
Mitsubishi Electric
Corporation
5-1-1 Ofuna,
Kamakura, Kanagawa 247-0056, Japan
Abstract: For improving analysis accuracy in wide-angle radiation
patterns for three-dimensional radome antennas, an analysis based on secondary sources taking account of both transmission
and reflection by the radome surface is presented. In this paper, we propose a method for the analysis of large
three-dimensional radomes. In order to evaluate the reflection by the radome surface, measured and calculated radiation
patterns for an element antenna with a conical radome were compared. Also, the validity of the analysis method
was confirmed by comparing between measured and calculated radiation patterns for an array antenna with a three-dimensional
radome.
Index terms:
radome, array antennas, radiation patterns, secondary source
AP99-77, EMCJ99-37
(1999-08)
Study on Electromagnetic
Wave Absorber with Bincho Charcoal
Jong-Hwan Kim, Hideya Matsubara, Akafumi Fujimoto, Kazumasa
Tanaka, and Mitsuo Taguchi
Faculty of Engineering,
Nagasaki University
1-14 Bunkyo-machi,
Nagasaki-shi, 852-8521
Abstract: The complex permittivity and permeability of the
materials with bincho charcoal powder and silicon are measured at the frequencies from 50MHz to 4.05GHz. The measured
data are compared with the conventional materials for the electromagnetic wave absorber. The imaginary part of
permittivity is large compared with the conventional materials for absorber. The reflection, transmission coefficients
and absorbing coefficient of single layer 10 mm or 50 mm thick are calculated by using FDTD method. More than 96%
of the incident power is absorbed within the single layer of 50 mm in thickness.
Index terms:
FDTD method, Bincho charcoal, Electromagnetic wave absorber, Permittivity
AP99-78, EMCJ99-38
(1999-08)
Thermal Effects
of EM waves on the Human Eye
Akimasa Hirata, Gou Ushio, and Toshiyuki Shiozawa
Graduate School
of Engineering, Osaka University
Yamada-oka 2-1,
Suita-shi, Osaka 565-0871
Abstract: The interaction between the human eye and EM waves
in the microwave range is discussed with the aid of FDTD method. Numerical results show that hot spots appear in
a certain frequency range, and the location and number of hot spots depend on the frequencies of the incident wave.
Additionally, temperature rises in the human eye are calculated to assess the possibility of microwave-induced
cataract formation. The numerical estimate shows that,
for the worst case, the EM wave with the power density 22[mW/cm2] induces temperature rise 3.0C, the threshold
temperature rise for cataract formation.
Index terms:
human eye, FDTD method, specific absorption rate, hot spots
AP99-79, EMCJ99-39
(1999-08)
A Study on
Man-made Noise Elimination Technique for ISM-Band DS-SS Systems Using Multicode and Noise Observation Channel
Sakda Unawong, Shinichi Miyamoto, and Norihiko Morinaga
Department of
Commun. Eng., Graduate School of Eng., Osaka University
2-1 Yamada-oka,
Suita, Osaka 565 Japan
Abstract: It is well known that electromagnetic interference
(man-made noise) radiated from industrial, scientific and medical (ISM) apparatus can seriously degrade the performance
of ISM-band (2.4-GHz) wireless local area networks (WLANs). In this paper, an ISM-band WLAN which employs a DS-SS
(Direct Sequence-Spread Spectrum) system is designed to be sufficiently robust and reliable to operate in the presence
of this man-made noise. To satisfy this goal, a technique to suppress the man-made noise in the DS-SS system using
a multicode transmission and a noise observation channel is proposed. Numerical results demonstrate that the DS-SS
system using the proposed technique performs well even in the presence of the man-made noise.
Index terms:
ISM-Band DS-SS, Man Made Noise, Multicode, Noise Observation
AP99-80, EMCJ99-40
(1999-08)
Study on Balance-Unbalance
Conversion Characteristics of Untwisted Off-Balanced Metallic Pair Lines and Electromagnetic Wave Emission
Tsuyoshi Ideguchi*, Hiroaki Koga**, and Yoshihumi Shimoshio**
*Department
of Electronics and Information Technology Kyusyu, Tokai University
**Kumamoto National
College of Technology
*9-1-1 Toroku,
Kumamoto-shi, 862-8652 Japan
Abstract: Balance-unbalance conversion characteristics of
effective power on untwisted off-balanced metallic pair lines are investigated over a wide range of frequencies
in the MHz region. First, we developed a method to estime effective power conversion factors using a cascade connection
of F matrixes, where the imbalance in impedance
and admittance of each pair line is distributed uniformly along the
line. As a result , the frequency dependency of the effective power conversion factors shows periodic fluctuations
at frequencies higher than the frequency corresponding to the wavelength, which is about six times as long as the
pair lines. And the conversion factor fluctuates around the conversion factors of the balance-unbalance conversion
transformer itself connected to the pair lines when the height of pair lines increases or the balance-unbalance
conversion factor of the pair lines decreases at high frequencies. Furthermore, electric field intensities of electromagnetic
wave emitted from metallic pair lines were measured at an open field site, when electric signals were fed to the
normal mode circuit of pair lines. As a result, relations between the effective power conversion characteristics
and the electric field intensity characteristics were obtained.
Index terms:
Untwisted off-balanced metallic pair lines, Effective power, Balance-unbalance conversion characteristics, Electromagnetic
wave emission
AP99-81, EMCJ99-41
(1999-08)
Method for
Finding Radiated Emission Sources with Arbitrary Directional Current Components
Yasuhiro Ishida * Kazuo Murakawa ** Kouji Yamashita***, and
Masamitsu Tokuda ***
* Mechanics
& Electronics Research Institute, Fukuoka Industrial Technology Center
**NTT Network
Service System Laboratory
***Kyushu Institute
of Technology
*3-6-1 Norimatsu,
Yahatanishi-Ku, Kitakyushu-Shi 807-0831, Japan
**3-9-11 Midori-Cho,
Musashino-Shi, Tokyo 180-8585, Japan
***1-1 Sensui-Cho,
Tobata-Ku, Kitakyushu-Shi 804-0015, Japan
Abstract: Relating to the radiated emission sources finding
method utilizing CISPR emission measurement system, which uses only amplitude data without phase data, we propose
a new finding algorithm in order to apply this method to sources with arbitrary directional current components.
As a result of experimental verification by using two spherical dipole antennas, estimated values show good agreement
with the original ones in the frequency range from 300 MHz to 1 GHz, where the position estimation deviation d was
less than 0.15 m, the amplitude estimation deviation j was less than 2.1 dB, and furthermore the angle of current direction could be estimated.
Index terms:
Radiated emission, CISPR emission measurement system, Sources finding method
AP99-82, EMCJ99-42
(1999-08)
Characteristics
of Radiated Emission from a Bend Microstripline
Keiji Miyauti *, Tetsuya Kawashima*, Yasuhiro Ishida**, and
Masamitsu Tokuda*
*Kyushu Institute
of Technology
**Fukuoka Industrial
Technology Center
*1-1 Sensui-
Cho, Tobata-Ku, Kitakyushu-Shi 804-
0855,
Japan
**3-6- l, Norimatsu,
Yahatanishi-Ku, Kitakyushu-Shi 807-0831, Japan
Abstract: On attempt for radiated emission from electronic
equipment, it is necessary to investigate characteristics of radiated emission from signal-line on printed circuit
board in electronic equipment. We analyzed and measured radiated emission from printed circuit board which is a
90 bend microstripline in this paper. We confirmed computed result obtained by using method of moment for the
prediction of radiated emission from printed circuit board. Moreover, we investigated characteristics of radiated
emission from a 90 bend microstripline by comparing with straight microstripline.
Index terms:
printed circuit board, microstripline, equivalent-wire method of moment
AP99-83, EMCJ99-43
(1999-08)
Scattered Fields
by a Rectangular Cylinder with Surface Impedance
Hirokazu Kobayashi And Kohei Hongo
Fujitsu System
Integration Laboratories
Faculty of Science,
Toho University
Abstract: We have treated scattering from a rectangular cylinder
with surface impedance illuminated by plane wave, considering Transition Current (TC). When the size of the scatterer is large
with respect to wave-length, the Physical Optics approximation method (PO) is known to be a useful approach for
predicting a diffracted or radiated fields. However, the traditional PO approximation is not reliable since it
uses current of Geometrical Optics. In this paper, we introduce transition electromagnetic current determined from
Maliuzhinet Function which is canonical problem for wedge with surface impedance and formulate radiation from a
rectangular impedance cylinder by using proposed method named PTD-TC (Physical Theory of Diffraction with Transition
Current).
Index terms:
PO, Transition Current (PTD-TC) , Rectangular Impedance Cylinder , Maliuzhinet Function
AP99-84, EMCJ99-44
(1999-08)
Interpretation
of Strong Enhancement of Waves Scattered from Concave-Convex Targets
H. El Ocla and M. Tateiba
Dept. of Computer
Science and Communication Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu
University
6-10-1 Hakozaki
Higashi-ku Fukuoka 812-8581
Abstract: Study of wave propagation through random medium
manifested strong enhancement in the radar cross-section for a target with concave-convex surface. Such phenomenon
that occurs when H-wave illuminates the convex portion can't be interpreted only as a conventional specular contributions
from the stationary points. In the contrary the anomalous increase in the radar cross-section is absent for wave
incidence on concave portion. In this paper we will show clearly that the large contribution arised from inflection
points especially those which lie in the shadowed region provides a satisfied interpretation for that anomalous
increase. Such contribution can be interpreted as specular ones due to creeping waves which undergo focusing at
the concave portion although those points are non-specular points in real space. However such large increase in
RCS does not happen in case of concave illumination because the inflection points contribution of shadowed region
is much smaller than convex illumination case. Moreover, plane and beam waves are different as well known which
leads to different contributions arised from inflection points especially those which lie in the shadowed region.
For these two reasons the anomalous enhancement in RCS has been occurred with convex illumination portion.
Index terms:
scattering problem, concave-convex, radar cross-section, beam wave
AP99-85, EMCJ99-45
(1999-08)
Plane Wave
Scattering from Perpendicularly Crossed Multilayered Strip Gratings
Akira Matsushima, Tatyana L. Zinenko, Hiroyuki Nishimori,
and Yoichi Okuno
Department of
Electrical and Computer Engineering, Kumamoto University
Kurokami 2-39-1,
Kumarnoto-shi, 860-8555 Japan
Abstract: We develop a numerical solution to the scattering
problem with regard to perpendicularly crossed multilayered strip gratings . This structure is regarded as a microscopic
model of electromagnetic wave absorbing sheet of the fiber type. The boundary value problem is formulated into
the set of integral equations, which is discretized to the linear equations by applying the moment method. Numerical
computation is carried out for the distribution of the incident power to the reflected, transmitted, and absorbed
powers. The absorbing rate exceeds 94 % by a proper choice of grating parameters. The equivalent circuit parameters
of the crossed resistive grating is also obtained.
Index terms:
strip gratings, electromagnetic scattering, electromagnetic absorption, moment methods
AP99-86, EMCJ99-46
(1999-08)
Analysis on
Connection Problem of Three Dimensional Optical Waveguides using Fourier Series Expansion Method (II)
Michiko Momoda, Tokuo Miyamoto, and Kiyotoshi Yasumoto
Department of
Electronics Engineering and Computer Science, Faculty of Engineering, Fukuoka University
Graduate School
of Information Science and Electrical Engineering, Kyushu University
8-19- 1, Nanakuma,
Jonan-ku, Fukuoka-shi, FUKUOKA 814-0180 Japan
6- 10- 1, Hakozaki,
Higashi-ku, Fukuoka- shi, FUKUOKA, 812-8581 Japan
Abstract: We present an effective numerical method for three-dimensional
optical waveguide system introducing a virtual periodicity in both transverse directions, in which the propagation
characteristics can be solved as an eignvalue problem on a second order differential equation concerning the coefficients
in the double Fourier series expansion of the electric and magnetic fields in the Maxwell equations. Using the
method, accurate analysis of the connection problem between an optical fiber (refractive index difference n=0.3%)
and an embedded optical waveguide (n=0.6%) whose index distribution is parabolic is tried. Then transmitted, reflected
and radiated powers are made clear, when the center of both waveguides is shifted transversely and the gap distanse
is changed, comparing with the case of n=1%.
Index terms:
Optical fiber, embedded thin-film waveguide, connection problem, numerical analysis
AP99-87, EMCJ99-47
(1999-08)
Waveguide Analysis
for a Broad-Area LD with a Wide Stripe
Naoyuki Morimoto and Tadashi Takano
The Institute
of Space and Astronautical Science
3-1-1, Yoshinodai,
Sagamihara, KANAGAWA, 229-8510 Japan
Abstract: A set of the wave equation and the diffusion equation
are solved simultaneously in an analysis the wave guides of LD. The diffusion equation is possible to be solved
by Runge-Kutta method sequentially. However, since there is much error at the stripe edges, it is difficult to
converge at wider stripe. In this study, we apply the relaxation method iteratively for LD analysis to avoid the
difficulties in Runge-Kutta method. Both methods are compared and investigated. It is shown that the relaxation
method is effective to analyze LDs with a wider stripe.
Index terms:
diffusion equation, relaxation method, Runge-Kutta method, broad-area laser, filamentation
AP99-88, EMCJ99-48
(1999-08)
Time-Frequency
Analysis of Electromagnetic Scattering Responses Using the Adaptive Normalized Gausian Bases Representation
Masahiko Nishimoto, Yoshihiro Kikukawa, and Hiroyoshi Ikuno
Dept. of Electrical
and Computer Engineering, Kumamoto University
Kurokami 2-39-1,
Kumamoto, 860-8555 Japan
Abstract: ADS (Adaptive Spectrogram), that is a new method
for joint time-frequency analysis and is based on AGR (Adaptive normalized Gaussian basis Representation), is applied
to the time-frequency analysis of scattering responses. Unlike the Short Time Fourier Transform and the Wavelet
Transform, the time and frequency resolutions and time-frequency centers of normalized Gaussian elementary function
are adjusted to best match the signal. Numerical simulations are curried out for scattering responses from a waveguide
cavity, and the properties of ADS are investigated.
Index terms:
adaptive spectrogram, time-frequency analysis, electromagnetic scattering, AGR, ADS
AP99-89, EMCJ99-49
(1999-08)
Analysis of
Time-Domain Inverse Scattering Problem for a Dispersive Chiral Slab
Atsushi Kusunoki and Mitsuru Tanaka
Faculty of Engineering,
Oita University
700 Dannoharu,
Oita 870-1192, Japan
Abstract: A time-domain inverse scattering problem for the
reconstruction of constitutive parameters of a dispersive chiral slab, which is located in free space, is investigated.
Time responses of the transmitted and reflected electromagnetic fields are simulated by using the FDTD method.
Applying the Levenberg-Marquardt-Morrison method to the minimization of a residual error being the difference between
the measured and calculated responses, an iterative algorithm of reconstructing the constitutive parameters is
obtained. It is seen from the numerical results that the reconstructions of a homogeneous dispersive chiral slab
show very good agreement with the true profiles.
Index terms:
inverse scattering problem, dispersive chiral slab, FDTD method, Levenberg-Marquardt-Morrison method, iterative
algorithm
AP99-90, EMCJ99-50
(1999-08)
FDTD Analysis
of Microwave Imaging of a Biaxial Anisotropic Cylindrical Object
Takashi Takenaka, Hongting Jja, and Toshiyuki Tanaka
Dept. of Electrical
and Electronic Eng., Faculty of Engineering, Nagasaki University
Abstract: A new iterative algorithm for the reconstruction
of two-dimensional biaxial anisotropic objects is developed using time-domain scattering data. All of the calculations
in both the forward and inversion algorithms are carried out efficiently in the time domain using the finite-difference
time-domain method. Computer simulations are presented to illustrate the usefulness of the present method.
Index terms:
Biaxial anisotropic medium, Inverse problem, FDTD method
A P99-91, EMCJ99-51
(1999-08)
Edge-Preserving
Regularization Scheme for Time Domain ID Inverse Scattering
Hiromi Yoshida, Toshiyuki Tanaka, and Takashi Takenaka
Dept. of Electrical
and Electronic Eng. Faculty of Engineering, Nagasaki University
1-14 Bunkyou-machi
Nagasaki-shi, 852-8521, Japan
Abstract: A new iterative algorithm for the reconstruction
of one-dimensional object is developed using time-domain scatting data. Since many inverse problems are ill-posed,
regularization schemes are often used in order to get numerically stable solution and to improve the quality of
reconstruction. In this paper, we incorporate our previous iterative method with an edge-preserving (EP) regularization.
All of the calculations in both the forward and inversion algorithm are carried out efficiently in the time domain
using the finite-difference-time-domain (FDTD) method. Computer simulations are presented to illustrate the usefulness
of the present method.
Index terms:
Edge-Preserving Regularization, Inverse problem, FDTD method, Stratified media
EMCJ99-52
(1999-09)
The Characteristic
of VHF Broad-Band Pulse Caused by Corona Discharge
Jun-ichi Abe, T Ampol, R. Mardiana, Zen-ichiro Kawasaki, and
Kenji Matsuura
Power Engineering
Laboratory, Graduate School of Engineering, Osaka University
2-1 Yamadaoka,
Suita, Osaka 565-0871, Japan
Abstract: Partial Discharge (PD) on the power distribution
line is a warning or symptom of insulation breakdown and electromagnetic (EM) waves from it interfere with communication
system as noises. Therefore, the location and cause diagnosis of PD are very important to solve this problem. In
this paper, we use broadband antennas to detect the EM waves emitted from corona discharges, and analyze the characteristic
of VHF broadband pulse caused by various kinds of discharges. The result is useful to interpret the mechanism of
PD and applicable to PD diagnosis.
Index terms:
Partial Discharge, Insulation Diagnosis, Broadband Antenna (VHF), Pulse of EM wave, Insulator of Distribution line
EMCJ99-53
(1999-09)
An AC/AC Power
Conversion System Being Capable of Suppressing Both Harmonics and EMI
Masato Fujikawa, Satoshi Ogasawara, and Hirofumi Akagi
Dept. of Electrical
and Electronic Engineering, Okayama Univ.
3-1-1 Tsushima-naka,
Okayama 700-8530, Japan
Abstract: This paper proposes a new AC/AC power conversion
system that is capable of suppressing not only supply harmonic currents but also electromagnetic interference (EMI).
The conversion system consists of a PWM rectifier and inverter, and an active common-noise canceler (ACC) which
has been proposed by the authors. The ACC developed for this system is characterized by sophisticated connection
of a common-mode transformer which can compensate for common-mode voltages produced by both the PWM rectifier and
inverter. As a result, the size of the common-mode transformer can be reduced to 1/3, compared with the previously
proposed ACC. A prototype AC/AC power conversion system (2.2 kW) has been implemented and tested. Some experimental
results show reduction characteristics of the supply harmonic current and EMI.
Index terms:
Active common-noise Canceler (ACC), Common-mode voltage, PWM inverter, PWM rectifier
EMCJ99-54
(1999-09)
Design Considerations
of the Common-Mode Transformer (CMT) using an Amorphous Core -
Damping of Leakage-Current Oscillation -
Daisuke Adachi, Satoshi Ogasawara, and Hirofumi Akagi
Dept. of Electrical
and Electronic Engineering, Okayama Univ.
3-1-1 Tsushima-naka,
Okayama 700-8530, Japan
Abstract: This paper deals with high-frequency leakage currents
caused by voltage-source PWM inverters. A non-negligible amount of leakage current would flow through stray capacitors
between stator windings and a motor frame due to a large step change of the common-mode voltage produced by a PWM
inverter. It is shown that configuration of the common-mode transformer (CMT), which has been proposed by the authors,
is the most suitable for minimizing the magnetic core.
Furthermore, this paper presents a design method of the CMT for the
purpose of damping the leakage current. Combination of the design method and utilization of an amorphous core makes
the CMT small. Experimental results show that the prototype CMT can damp the leakage current and reduce the conducted
EMI.
Index terms:
Common-mode transformer (CMT), leakage current, EMI
EMCJ99-55
(1999-09)
The Electromagnetic
Wave Absorption Characteristic of Wasted Molding Sand Mixed Porous Cement Mortar Plate
Hiroki Anzai* and Ritsurou Makita**
*Tsuruoka National
College of Technology
**Maeta Techno-Research,
INC
Abstract: Recently, industrial wastes have been required to
recycle for environmental protection. A novel incombustible electromagnetic wave absorber using industrial wastes
is proposed for EMC problems. This new material has dielectric loss, which uses wasted molding sand . It is electromagnetic
wave absorption material consist of wasted molding sand mixed porous cement mortar. Here we reported about characteristics
of return loss of the absorber and experimental results are discussed.
Index terms:
wasted molding sand, absorber, porous, cement mortar, incombustible
EMCJ99-56
(1999-09)
The Relationship
between Placement of Decoupling Capacitors and High Frequency Cutrents on Power Terminal of ICs
Yukihiro Fukumoto*, Tetsuya Nakai**, Akihiro Namba**, Osami
Wada**, Ryuji Koga**, and Atsushi Nakamura@
*Matsushita
Electric Industrial Co., Ltd.
**Okayama University
@Hitachi, Ltd.
*1006 Kadoma,
Kadoma-shi, Osaka 571-8501
**3-1-1 Tsushima-naka,
Okayama 700-8530
@5-20-1 Jyosuihon-cho, Kodaira-shi, Tokyo 187-8588
Abstract: High frequency currents that flows out from the
power terminal of IC/LSI is thought as a main source of the electromagnetic radiation from the digital board. Therefore,
the method of measuring the currents of the power terminal is being examined by IEC, as a method of measuring EMI
of the semiconductor. In this report, the influence of mounting the decoupling capacitor and ideal way of power
supply on evaluation boards are discussed. From this experiment, the following results were observed. Evaluation
under same decoupling condition as actual case is preferable to keep actual running condition of DUT. Power supply
impedance must be specified to minimize deviation of measured data.
Index terms:
EMI, LSI, semiconductor mounting, power supply current, decoupling capacitor
EMCJ99-57
(1999-09)
A Method for
Reducing Radiated Emission from Multilayer Printed Circuit Boards with Decoupling Capacitors
Sadahiro Tani , Masa-aki Ozaki , Masamichi Naka, and Matahira
Kotani
Precision Technology
Development Center, Sharp Corporation
2613-1 Ichinomoto-cho,
Tenri 632-8567
Abstract: Radiated emission from multilayer PCBs is mainly
caused by a parallel plate resonator composed of the power and ground planes. To reduce the emission, methods for
placing decoupling capacitors between power and ground planes have been developed these days. We have developed
a new method for reducing emission by placing several decoupling capacitors on PCBs and shifting resonance frequencies
to over a cut-off frequency of the emission sources. In this report, the detail of the method is presented and
the experimental results show the effectiveness.
Index terms:
EMI, PCB, decoupling capacitor, power-ground plane resonance
EMCJ99-58
(1999-09)
Estimation
of Terminal Current of CMOSIC by Using an Equivalent Circuit
Satoshi Kazama, Shinichi Shinohara and Risaburo Sato
Electromagnetic
Compatibility Research Laboratories Co., Ltd.
6-6-3 Minamiyoshinari
Aoba-ku Sendai-shi 989-3204
Abstract: An equivalent circuit of the power-supply-terminal
and the signal-output-terminal of CMOS IC was proposed. This equivalent circuit includes the low-pass filter composed
of capacitance by the destruction prevention diode and inductance by the terminal frame lead of IC. The current
change on the power-supply-terminal and the signal-output-terminal when an EMI countermeasure part is inserted
in either power-supply-terminal or signal-output-terminal can be estimated by using this equivalent circuit. Moreover,
the effect which the inductance of the ground terminal frame changes the power supply current is estimated by using
this equivalent circuit.
Index terms:
CMOS IC, Current on terminal, Equivalent circuit, Lead inductance, Diode capacitance
EMCJ99-59
(1999-09)
A Study on
the Model of the Slit on the Ground Plane
Yukinori Mizuguchi, Hidetoshi Yamamoto, Shinichi Shinohara,
and Risaburo Sato
Electromagnetic
Compatibility Research Laboratories Co., Ltd.
6-6-3 Minamiyoshinari
Aoba-ku Sendai-shi 989-3204
Abstract: If there exists the slit on the ground plane perpendicular
to the line, this slit cause bad effect to the transmission characteristics of the line. This paper describes the
study on the model of the slit on the ground plane. We regard the structure that there exists a slit on the ground
plane as a slot line and make the model that the slit is represented in the transmission line. And, we can get
good agreement between measured results and calculated results using this model. Also, we make the model when forms
of the slit are changed, and we can get good agreement between measured results and calculated results.
Index terms:
slit, slot line, microstrip line, ground
EMCJ99-60
(1999-09)
Investigation
of The Protection Margin for Co-Channel Interference of 2.4-Ghz Band Spread Spectrum System in Indoor Wireless
Communication Environment
Kazuhiro Takaya and Yuji Maeda
NTT Lifestyle
and Environmental Technology Laboratories
9-11 , Midori-Cho
3-Chome Musashino-Shi Tokyo 180-8585 Japan
Abstract: We investigated the protection margin for the co-channel
interference of 2.4-GHz band spread spectrum system in indoor environment in order to predict the required desired
signal to undesired signal (D/U) ratio considering propagation characteristics. As a result, the required protection
margin for our office model was about 15 dB when BER = 10-4, which was the transmission quality required for the wireless LAN. The calculated co-channel
interference characteristics using Rician fading model were agreed well with experimental results, and the specular-to-random
ratio K was from 7 to 14 dB. It was considered that we can simulate the protection margin for the co-channel interference
using Rician fading model.
Index terms:
Indoor communication environment, Spread spectrum, Co-channel interference, BER, Protection margin
EMCJ99-61
(1999-09)
Analysis of
Anechoic Chamber Characteristic using FDTD Method
Yasunari Takiguchi, Mamiko Inokuchi, Eiju Kimura, and Masamitsu
Tokuda
Kyusyu Institute
of Technology
1-1 Sensui-Cho,
Tobata-Ku, Kitakyusyu-Shi 804-0855, Japan
Abstract: The ray tracing method is generally used for the
analysis of anechoic chamber characteristic, but, it has a problem concerning to accuracy deterioration on the
low-frequencies of hundreds MHz or less. Then, we try to introduce FDTD method as an analysis method of anechoic
chamber. In this paper, by using FDTD method, reflection coefficient of ferrite tile used as absorber in anechoic
chamber and NSA (normalized site attenuation) in free space with Mur's absorbing boundary are calculated. The result
of reflection coefficient from FDTD method agreed well with the theoretical value which was analytically obtained
from the material constant of the ferrite. Moreover, comparing with calculation result from the method of moment
(MoM), the result of NSA from the FDTD method agreed within almost } 1dB.
Index terms:
Anechoic chamber, FDTD method, Site attenuation
EMCJ99-62
(1999-09)
Characteristic
evaluation of PW (Parallel Wired) Cell
Ikuo Nakano*, Eiju Kimura*, Masamitsu Tokuda*, and Katsuo
Ishihara**
*Kyushu Institute
of Technology
**Matsushita
Electric Industrial Co., Ltd
*1-1, Sensui-cho,
Tobataku, Kitakyushu-shi, Fukuoka, 804-8550 Japan
**1-6, Matsuo-cho,
Kadoma-shi, Osaka, 571-0044 Japan
Abstract: The frequency characteristics of an electric field
inside the PW cell was measured. It has been understood that the electric field between the central wires and the
outer wires is more than 20dB up to 4.5GHz compared with an orthogonal electric field to the wire, and it was confirmed
to keep the uniformity of 6dB of all measurement point if the absorbers are arranged appropriately.
Index terms:
PW (Parallel Wired) cell, TEM cell, immunity test
EMCJ99-63
(1999-09)
Finding Method
of Radiated Emission Source from Cable Connected with Electronic Equipment
Yuichi Yamaguchi*, Yasuhiro Ishida**, Kouji Yamashita*, and
Masamitsu Tokuda*
*Kyushu Institute
of Technology
**Fukuoka Industrial
Technology Center
*1-1 Sensui-Cho,
Tobata-Ku, Kitakyushu-Shi 804-0855, Japan
**3-6-1, Norimatsu,
Yahatanishi-Ku, Kitakyushu-Shi 807-0831, Japan
Abstract: It is important to find the source to control the
electromagnetic disturbance generated from an electronic equipment. To confirm the generality of this technique
at this time, the method of finding the radiated emission source from the cable connected with the equipment was
examined. A radiated emission source imitating cable was first made, and the radiated electric field was calculated
by using the wire-grid method, and it was confirmed that the calculated value agreed with the measured value. Moreover,
an extremely excellent result was obtained since the radiated emission source was found with estimated accuracy
of 15cm by using calculated value of the radiation electric field.
Index terms:
Discrete singularity method, Radiated emission source finding technique, cable
EMCJ99-64
(1999-09)
A study on
Structure and Shielding Effectiveness of Conductive Zipper and Shielding Tube
Kaoru Shinozaki
NTT Network
Service System Laboratories
9-11, Midori-Cho
3-Chome Musashino-Shi, Tokyo 180-8585 Japan
Abstract: With higher signal speeds and a greater variety
of telecommunication equipment, it is necessary to suppress the electromagnetic interference (EMI) field from equipment,so
that it does not disturb nearby radio and television receivers. The signal cable are the dominant EMI sources. Motivated
by this background, A Conductive Zipper and Shielding Tube has been developed to reduce electromagnetic emission
from signal cable. Shielding effectiveness of The Shielding Tube is about 4dB.
Index terms:
EMC, Signal Cable, EMI, Shielding
EMCJ99-65
(1999-09)
International
Trend and Technical Problems on EMC to Vehicles [2]
- Basic defects
of CISPR12 and how to overcome them in developing ITS -
Akinori Kameshima*, Shigekazu Shibuya*, Haruo Ishizuka*, Toshio
Kinoshita**, Yutaka Ohno***,
Naoki Suzuki@, Knio Takamura#, Kouichi Yamaguchi#, and Juiti Kaku#
*Kameshima,
Shibuya or Ishizuka Consultant office
**EMCT Study
group
***System Technico
@Wooden Bell Consultant
#Colory
Abstract: The 21st century is deemed as an era of the ITS
(Intelligent Transport Systems) where the information communication system will hold the key to the success. The
most important to do will be improvement of the electromagnetic compatibility environment in the automobile and
its on-board peripheral electronic equipment, however, a serious defect we have is a fact that the CISPR12 recommendation
for EMI test method may depend upon an indefinite measure. We have pointed out this problem in an EMC study group
meeting and in a JSAE (Society of Automotive Engineers of Japan) meeting in 1996, however, no agreement has been
obtained. This paper intends to elucidate the fact that the CISPR12 measurement system (new version) still depends
on the indefinite measure in theory and through practical data and explains that the definite measure be realized
by means of the free-space type U site.
Index terms: EMC test site, automobile,
metallic floor, free space, U-fence indefinite measure
EMCJ99-66, MW99-118
(1999-10)
Mode Conversion
of the Output Mode in the Overmoded-Waveguide Millimeter-Wave Oscillator
Jongsuck Bae, Masayuki Fujita, Shinjiro Toyota, and Koji Mizuno
Research Institute
of Electrical Communication, Tohoku University
2-1-1 Katahira,
Aobaku, Sendai 980-8577, Japan
Abstract: An overmoded-waveguide oscillator is a highly efficient
spatial power combiner for millimeter-wave Gunn diodes. The oscillators can produce a higher CW-power of more than
1W at the frequencies above 60 GHz. In order to transform an output mode of the oscillator (rectangular-waveguide
TEm0-modes) into the TE10 mode, mode converters using overmoded waveguides
have been developed.
Index terms:
millimeter wave, spatial power combiner, overmoded waveguide, mode converter
EMCJ99-67, MW99-119
(1999-10)
Numerical Analysis
of AC Losses in Wire Transmission Lines Composed of Imperfect Conductor
Akira Matsushima and Takayuki Kagehira
Department of
Electrical and Computer Engineering, Kumamoto University
Kurokami 2-391,
Kumamoto-shi, 860-8555 Japan
Abstract: An accurate numerical analysis is presented for
the AC effective resistance and the inductance of imperfectly conducting wire transmission lines. The number and
the allocation of the wires are arbitrary.
The analysis is based on integral equations combined with the moment
method. The numerical results are shown for the resistance and inductance of two-wire and three-wire lines, and
their behavior is considered physically in view of the skin and proximity effects. The present technique is also
applied to the microstrip lines and obtained good agreement with the results by other methods.
Index terms:
transmission lines, inductance, skin effect, proximity effect, integral equations
EMCJ99-68, MW99-120
(1999-10)
Computing Method
for Radiation Q, External Q and Unloaded Q Values of Resonator in Time Domain Electromagnetic Field Computation
Yukio Iida
Faculty of Engineering,
Kansai University
3-3-35 Yamate-cho,
Suita-shi, 564-8680 Japan
Abstract: Methods for computing the Q values in time domain
electromagnetic field computation are studied.
Four computing method based on energy relationship about the radiation
Q, external Q and unloaded Q are described, and the detailed results for cavity resonators with two ports and without
an port are presented. Computing methods with high accuracy are shown.
Index terms:
Q value, Resonator, FDTD method, Time domain method
EMCJ99-69, MW99-121
(1999-10)
Microwave Circuits
designed by the Genetic Algorithms
Tamotsu Nishino, Franco De Flaviis*, and Nicolaos G. Alexopoulos*
Mitsubishi Electric
Co.
*University
of California at Irvine, Irvine, CA 92697
5-1-1 Ohfuna
Kamakura Kanagawa 247-8501
Abstract: The Genetic Algorithm (GA) is used in this paper
for the design of compact size microwave circuits. We proposed a novel function to make a variety of circuit's
topologies out of sequences of binary system, which we call genes. As validation of the design approach, microwave
filters operating at 3 to 5 GHz are designed, and tested. Good agreement is found between measured and theoretical
data. This validates the GA approach as a novel method for the design of microwave circuits.
Index terms:
MICROWAVE, FILTERS, GENETIC ALGORITHMS
EMCJ99-70, MW99-122
(1999-10)
High-Frequency
Modeling of BJT Fabricated on High Resistive Si Substrate
M. Ono, N. Suematsu, S. Kubo, Y. Iyama, T.Takagi, and O. Ishida
Information
Technology R&D Center, Mitsubishi Electric Corp.
5-1-1 Ofuna,
Kamakura-city, Kanagawa 247-8501 , Japan
Abstract: The high resistive substrate enhances the RF performance
of BJT and enables to reduce the dielectric loss of spiral inductor. In this paper, to evaluate the effect of high
resistive substrate on RF performance of BJT, and the same dimension BJT's have been fabricated on both high resistive
substrate and conventional low resistive substrate . The equivalent circuit parameters have been extracted by using
the equivalent circuit model in consideration of dielectric loss of these substrates. The improvement effect of
RF performance of BJT can be explained only with the dielectric loss of the substrate by referring the extracted
equivalent circuit parameter.
Index terms:
Microwave circuits, Si-MMIC, Bipolar junction transistor, High resistive Si substrate
EMCJ99-71, MW99-123
(1999-10)
Development
of Schottky Barrier Diodes with a Quarter-Micron Anodes for THZ Applications
Minoru Araki*, Hiroaki Minamide**, Takanari Yasui**, Hirotomo
Fujishima**, Tetsu Suzuki***, and Koji Mizuno*
* Research Institute
of Electrical Communication, Tohoku University .
** Photodynamics
Research Center, The Institute of Physical and Chemical Research
*** Sendai National
College of Technology
2- 1- 1 Katahira,
Aobaku, Sendai 980-8577, Japan
Abstract: The work described here is specifically aimed at
fabricating Pt/GaAs Schottky barrier diodes (SBD) with a quarter-micron anodes for THz applications. To establish
stable fabrication process for SBD, an endpoint detection for ECR plasma etching has been developed using quadra-pole
mass spectroscopy. Video detection performances of SBD's at 1.4 THz were evaluated. The voltage sensitivity at
4 THz was theoretically estimated. NEP 7.3 x 10-11
W/Hz 1/2
is obtained at video frequency of 5 MHz. A mechanism of low-frequency noise was
discussed.
Index terms:
terahertz, Schottky barrier diode, ECR etching, video detection, low-frequency noise
EMCJ99-72, MW99-124
(1999-10)
Improvement
of a Laminated 2~2 Active Integrated Amplifier Antenna Array
Yoshiharu Kido, Hiroyuki Hayakawa, Yuki Yoshida, Shigeo Kawasaki
Tadashi Takano*, Makoto Nagatomo*, and Susumu Sasaki*
Tokai University,
Department of Communicaiton Engineering
*The Institute
of Space Astronautical Science
1117 Kita-Kaname,
Hiratsuka, Kanagawa 159-1292
*3-1-1, Yoshinodai
Sagamihara, Kanagawa 229-5810
Abstract: In this report, improvement of a 2 x 2 active integrated
amplifier antenna array was explained, and the better structure progressed on the problem of the function such
as high power was demonstrated. In order to improve characteristics as antenna pattern of the 2 x 2 array, a tuning
function using an open stubs was added to the array. Further, the two-stage FET amplifier was adopted in the unit
cell in order to enhance the design flexibility, and the fundamental data were obtained.
Index terms:
active integrated antenna, SPS2000, amplitude, microwave power transmissions
EMCJ99-73, MW99-125
(1999-10)
A Variable
Delay Line using FET ternminator in Ku-band
M. Hieda *, E. Taniguchi *, H. Kurusu **, H. Aruga ***, Y.
Iyama ***, T. Takagi *, N. Kadowaki @,
and T. Araki@
* Mitsubishi
Electric Corporation, Information Technology R & D Center
** Mitsubishi
Electric Corporation , High Frequency & Optical Semiconductor Div.
*** Mitsubishi
Electric Corporation, Kamakura Works
@ Communications Research Laboratory
*, **, *** 5-1-1
Ofuna, Kamakura-city, Kanagawa, 247 Japan
@ 4-2-1Takaikita, Koganei-city, Tokyo, 184 - 8795
Japan
Abstract: Active phased array antennas which developing by
CRL for the Giga-bit satellite need a variable delay line (VDL) to achieve wide band beam steering characteristics.
The bandwidths and maximum phase shifts of the VDL using switched line phase shifter circuits have been limited
by switched out line resonance effect.
An interesting technique for using resistive loading to reduce the resonance
effects was presented. This paper describes a VDL using small FET switch which serve both as resistive terminator
to reduce the resonance effects. The developed 4bit VDL has archived good performance in Ku-band.
Index terms:
Variable Delay Line, Termination, FET
EMCJ99-74, MW99-126
(1999-10)
Optical Interactions
with Magnetostatic Waves in Microstrip Lines on YIG Thin Film Substrate
Makoto Tsutsumi, Tetsuya Ueda, Kazuhiko Kikui, and Soven Kumar
Dana
Department of
Electronics and Information science, Faculty of Engineering and Design Kyoto Institute of Technology
Matsugasaki,
Sakyo-ku, Kyoto 606-8585, Japan
Abstract: Optical interactions with magnetostatic surface
wave, backward volume wave, and forward volume wave have been studied experimentally in the microstrip line which
consist of a 1mm-wide strip fabricated on YIG thin film substrate with the thickness of 100ľm. These have been
investigated in respect of optical modulation by microwaves for three modes. A few percent of modulation index
for three modes is obtained. By scanning the optical beam, it is observed that most of MSW energy is concentrated
under the strip conductor. To estimate the optical modulation index, coupling coefficient between the optical TEM
modes has been calculated for the MSW propagation using the coupled mode theory and it has also been compared with
experimental results.
Index terms:
magnetostatic waves, magneto optic effect, optical interaction with microwave, microstrip line, YIG
EMCJ99-75, MW99-127
(1999-10)
Wireless Thermometer
Using MMIC for Medical Treatment
*Youji Kotsuka, Hitoshi Kojima, Ken Orii, and Kenji Kamogawa**
*Dept. Telecommunication
Engineering, Tokai Univ.
**NTT Innovation
Laboratory
1117 Kitakaname,
Hiratsuka-shi, Kanagawa, 259-1292 Japan
Abstract: We have proposed the new wireless thermometer for
the thermal therapy using 3-D MMIC of a Si BJT VCO. This study has two goals. One is to develop a normal thermometer
for general thermal therapy, the other is to develop a new implant material built-in the thermometer, which has
local inductive heating and temperature measuring function. The fundamental characteristics of MMIC to be applied
to the thermometer have been examined. As a result, it had the linear frequency characteristic against the temperature
change from 30C to 50C. It was clarified that the MMIC has the fine propagation characteristic to detect temperature
at depth of more than 8 cm, and tolerance to magnetic field irradiation.
Index terms:
3-D MMIC, Si BJT VCO, Inductive heating, Thermometer, Implant material
EMCJ99-76, MW99-128
(1999-10)
A Report on
the 1999 IEEE MTT-S International Microwave Symposium
T. Tokumitsu*, T. Ueda**, T. Hirose***, S. Hidaka*4, M. Nakamura*5, H. Yano*6,
M. Shimozawa*7, K. Kamogawa*8, W. Chujo*9, T. Ohira*10,
Y. Umeda*8, and H. Ogawa*9
*Fuiitsu Quantum
Devices, ** Kyoto Institute of Technology, ***Fujitsu Labs., *4Murata
Mfg., *5Sony, *6NEC,
*7Mitsubishi, *8NTT, *9CRL, and *10ATR
Abstract: This paper summarizes the 1999 IEEE MTT-S International
Microwave Symposium held at Anaheim, CA, USA, in June 1999. The symposium chose the theme ""The Magic
Touch of Microwaves"" as an appropriate expression of how today's RF and microwave technology is magically
transforming our lives throughout the world. The attendance and the presented technical papers recorded the highest
numbers: greater than 10,000 and 468, respectively. The authors guide lots of interesting results on electromagnetic
analysis, device modeling, passive circuits and filters, amplifiers, frequency converters, oscillators, antennas
and sensors, digital circuits for microwave application, and future systems which were presented in the symposium.
Index terms:
IEEE IMS, Microwave, Millimeter-wave, Conference report
EMCJ99-77, MW99-129
(1999-10)
Search for
Pulse Noise Sources in Electric Power Distribution System
Ikuo Awai, Toshiki Morihiro, Hiroshi Kubo, Kazuaki Takaichi*,
and Koji Mochizuki*
Faculty of Engineering,
Yamaguchi University
* General Office
of Customer Relation and Services, The Kansai Electric Power Co., Inc.
2-16-1 Tokiwadai,
Ube 755-8611 Japan
*3-3-22 Nakanoshima,
Kita-ku, Osaka 530-8270 Japan
Abstract: Discharges at an insulator, bind or arrester on
the electric power distribution lines are induced by defective insulation or incomplete contact, emitting electromagnetic
noise of the wide frequency range of 0~100MHz and interfering with the low TV channels. This report proposes a
new and simple searching system of those discharges. The principle is to catch the localized magnetic field at
each utility pole and carry out a high-sensitive detection through the frequency selective amplification. This
is an interim report since the field test is not finished yet.
Index terms:
Electric power distribution lines, interfering pulse noise, EMC, localized magnetic field sensing
EMCJ99-78, MW99-130
(1999-10)
Disputation
for Matching Frequency Characteristics of Rubber EM-wave Absorber
Youji Kotsuka and Yoshihiko Komazawa
Dept. of Communication
Engineering, Tokai University
1117 Kitakaname,
Hiratsuka, Kanagawa, 259-1292, Japan
Abstract: We have proposed a simple method for changing and
improving the matching characteristics, using a EM-wave absorber with multi-Holes. This paper describes a method
of making a thin layer EM-wave absorber using ferrite and carbonyl iron materials. These characteristics have been
investigated by Spatial Network Method. In this paper, it is clarified that the matching characteristic for double
layer EM-wave absorber is changed and improved by adjusting the size of open-hole and the distance between holes.
For example, the matching thickness of 3 [mm] at 2.45[GHz] was obtained.
Index terms:
Open-hole ferrite, carbonyl iron, Matching frequency characteristics, Spatial Network Method
EMCJ99-79, MW99-131
(1999-10)
Estimation
of Attenuation Characteristics of Feed-Through Type EMI Filters using Fe-Si Alloy Flakes-Polymer Composite
Tadaharu Akino, Shinichi Shinohara, and Risaburo Sato
Electromagnetic
Compatibility Research Laboratories Co., Ltd.
6-6-3, Minami-Yoshinari,
Aoba-ku, Sendai, 989-3204 Japan
Abstract: The authors have constructed a prototype feed-through
type EMI filter by filling the hollow portion of a coaxial structure having an external diameter of 7 mm and an
internal diameter of 3.04 mm with composite magnetic material made up of Fe-Si alloy flakes and polyphenilene sulfide
resin. Insertion losses were measured in the frequency range from 100 MHz to 20 GHz for filter specimens differing
in length of composite magnetic material, and insertion loss of 10 dB and greater was observed from 1 GHz to 20
GHz in case of 20 mm. In addition, using material constants of composite magnetic material measured beforehand,
insertion losses were calculated, and it was found that the results of calculation agreed relatively well with
the above measurements. On the basis of the above, the authors have been able to clarify how the material constants
of the composite magnetic material affect insertion loss.
Index terms:
Feed-through type EMI filter, Insertion loss, Fe-Si alloy flakes-polymer, Material constants (Complex relative
permeability and complex relative permittivity)
EMCJ99-80, MW99-132
(1999-10)
Suppression
Effects of Electromagnetic Noise Derived from ICs Using Composite Magnetic Material for Package Molding
Yasuhiro Ono, Tadaharu Akino, Shinichi Shinohara, and Risaburo
Sato
Electromagnetic
Compatibility Research Laboratories Co., Ltd.
6-6-3, Minami-Yoshinari,
Aoba-ku. Sendai, 989-3204 Japan
Abstract: As high-speed switching became common in integrated
circuits (ICs), electromagnetic interference and mulfunctions caused by IC itself. As a suppression method of electromagnetic
noise from IC, it is considered to package IC by electromagnetic absorber. When high-speed CMOS standard logic
IC molded by ferrite-resin composite were driven by 10 MHz and 100 MHz input signal, high current flowing through
power supply terminal and output signal terminal were measured by RF current probe. At the same time electric field
strength were measured in an anechoic chamber. When the weight-% of ferrite powder content in the ferrite-resin
composite were changed 50 %, 65 %, and 80 %, the high frequency current flowing through power supply terminal was
decreased, and also electric field strength was reduced. These phenomena are considered that the high frequency
impedance of IC's power supply terminal are increased by complex relative permeability of composite magnetic material
using package.
Index terms:
IC, Package, Electric field strength, Composite magnetic material, Complex relative permeability
EMCJ99-81, MW99-133
(1999-10)
Measuring Electromagnetic
Interference Noise from Fiber-Optic Module
Takeshi Aizawa , Hidetoshi Yamamoto, Shinichi Shinohara, and
Risaburo Sato
Electromagnetic
Compatibility Research Laboratories Co., Ltd.
6-6-3 Minamiyoshinari
Aoba-ku Sendai-shi 989-3204
Abstract: Experiments were conducted to evaluate the influence
of the radiated emission from an optical transmission circuit of commonly used compact fiber optical modules. Far electric
field strength measurements show that the radiated emission has a clear peak at a high-order harmonic wave of the
signal pulse frequency. Near magnetic field distribution measurements show that the source of the interference noise
lies between an LED module and an LED driver.
By using a high-frequency equivalent circuit, it has been found as a
result of the comparison that both a peaking effect on deformed pulse waves, and the radiation property of the
fiber optical circuit form a factor that increases the radiated emission at particular frequencies from an optical
transmission module.
Index terms:
fiber optical modules, radiated emission, LED module, deformed pulse wave
EMCJ99-82, MW99-134
(1999-10)
A Study on
the Method of High-Speed Bus Circuit
Tetsuro Kato and Seiichi Saito
Mitsubishi Electric
Corporation, Information Technology R&D Center
5-1-1 Ofuna,
Kamakura, Kanagawa 247-8501, Japan
Abstract: Recently, in digital systems, such as computers,
the clock frequency is becoming faster and faster. On a bus which connects LSIs(CPU,chipset, etc.), the refrection
causes the waveform distortion of the bus. The waveform distortion makes the bus signal speed slow and the system
performance degraded. This study is about the proposed method of high-speed bus circuit which can reduce waveform
distortion without spoiling the signal transition speed and the better characteristics are verified by SPICE simulation.
Index terms:
high-speed bus, waveform distortion, propagation delay
EMCJ99-83, MW99-135
(1999-10)
Electromagnetic
Waves Cut-off by Metallic Lines on the Glass
Yutaka Kobayashi, Masaharu Takahashi, and Minoru Abe
Musashi Institute
of Technology
1-28-1 Tamatutumi,
Setagaya-ku, Tokyo 158-8557, Japan
Abstract: Concurrently with the remarkable development of
the electric and electronic equipments in recent years, those equipments have been rapidly in general use in offices.
These have created serious problems such as electromagnetic interference, signal mixture and so on, in particular
the information leakage due to the use of wireless LAN. This report addresses the methodology to cut-off the electromagnetic
waves by way of installing metallic lines on the window glasses. In view of MMAC being considered as the future
wireless IAN, we also propose the two frequency band cut-off using ring conductor and cross conductor for the purpose
of the cut~off of the 2.45GHz and 5GHz which is the frequency used for MMAC.
Index terms:
glass, electromagnetic waves cut-off, FD-TD method, metallic lines, wireless LAN, MMAC
EMCJ99-84, MW99-136
(1999-10)
Absorption
of Electromagnetic Waves by Dome Shape Concrete Walls
Hiroshi Sato, Masaharu Takahashi, and Minoru Abe
Musashi Institute
of Technology
1-28-1 Tamatutumi,
Setagaya-ku, Tokyo 158-8557, Japan
Abstract: In recent years, the office, home and so on are
equipped with various electric and electronic devices. Electromagnetic waves that are radiated from these devices,
reflect on the wall of the building or penetrate to the wall from outside, then they interfere to the other device.
It's necessary to decrease the reflection and transmission by the concrete wall.
In this paper, we analyzed the reflection and transmission characteristics of dome shape surface wall by the FD-TD
method. Its surface has asperity form that newly proposed. As a result, we obtained that the dome shape surface
wall consumed a power of electromagnetic wave in the wall more than a plain wall. Then the dome shape surface wall
can oppress reflection and transmission.
Index terms:
Reflection characteristic, Transmission characteristic, Concrete wall, FD-TD, Wireless LAN
EMCJ99-85, Mw99-137
(1999-10)
Non-destructive
Measurement of Complex Permittivity of Lossy Dielectric Slabs by using Quadrapole Antenna
Misao Furukawa*, Atsuhiro Nishikata**, and Yasutaka Shimizut***
*Graduate school
of Science and Engineering,Tokyo Institute of Technology
**CRADLE,Tokyo
Institute of Technology
***Graduate
school of Decision Science and Technology, Tokyo Institute of Technology
2-12-1 O-okayama,
Meguro-ku, Tokyo 152-8552
Abstract: A non-destructive, non-contact measurement method
for the complex permittivity of lossy dielectric slabs is investigated. A precise quadrapole antenna system is
constructed and actual measurements are performed by using it. The complex permittivities of three kinds of carbon-mixed
polystyrene foam slabs of 40mm-thick are measured at VHF band. Compared to a destructive measurement data by means
of parallel plate capacitor method, the presented method is found to have better reproducibility similar frequency
characteristics at frequencies below 140 MHz.
Analysis model assumes that the slab material is infinitely large, and the assumption is not always true. To evaluate
the influence of the slab edges, measurement is performed by moving the antenna system toward slab edges. This
gives a practical means to evaluate the measurement error due to the presence of the edge.
Index terms:
Quadrapole antenna, Dipole antenna Dielectric slab, Permittivity measurement, Non-destructive method, Non-contact
method, VHF band
EMCJ99-86, MW99-138
(1999-10)
EMI Measuring
Equipment above 1GHz
- Characteristic
Evaluation of Spectrum Analyzers
Hideaki Sugama* and Yukio Yamanaka**
*Kanagawa Industrial
Technology Research Institute
**Yokosuka Radio
Comnrunications Research Center, Communications Research Laboratory, M.P.T.
*705-1, Shimoimaizumi
Ebina, Kanagawa, 243-0435, Japan
**3-4, Hikarino-oka,
Yokosuka, Kanagawa, 239-0847, Japan
Abstract: Radiated EMI measurements
above 1GHz have been discussed in the CISPR (International Special Committee on Radio Interference). In the
relevant specifications, spectrum analyzers having peak detection function are specified as the mostly common measuring
equipment. In the EMI measurement, measured value depends on the filtering characteristics of the measuring equipment.
Therefore, CISPR specifies that the resolution bandwidth (RBW) which is defined by impulse bandwidth shall be 1MHz
}10%.
However, measurement method of the impulse bandwidth and measured data for the spectrum analyzers are not clearly
described. Then, we measured the characteristics of the commercially available ones and the results are compared
with the CISPR requirement. In addition, we also evaluate the effect of the video bandwidth (VBW) on the measurement
results as well as the weighted measurement by reducing the VBW.
Index terms:
spectrum analyzer, EMI measurement, impulse bandwidth, weighted measurement, frequency above 1GHz
EMCJ99-87, MW99-139
(1999-10)
Defects in
Conventional EMI Measuring Methods for Industrial, Scientific and Medical (ISM) Equipment and Its Effective Countermeasure
- Requirements
of Compatibility Among Electronic Technology Equipment and Stabilizing Measurement
Thereof -
Shigekazu Shibuya*, Hideya Andou**, Kazuaki Yoshimura**, Haruo
Ishizuka*, Toshio Kinoshita@,
Akinori Kameshima*, Takashi Suzuki@@,
Naoki Suzuki#, Yutaka Ohno##, and Juichi Kaku###
**Touin Yokohama University, *Shibuya, Ishizuka or Kameshima Consultant office, @EMCT EMC Study Group, @@Net Alpha, #Wooden Bell Consultant, ##Systemtechnico, and ###Colory
Abstract: Establishment of the methods of the EMI measurement
for industrial, scientific and medical (ISM) radio frequency equipment dates back to the times in which the radio
receivers only were in use. Therefore the methods have gone unmatched to the present art of technique where the
compatibility therein of the information technology equipment (ITE) is essential. To improve such situation, CISPR11 (3rd
version/1997) has recommended the method of measurement in common with ITE. Nevertheless the situation of producing
considerably large error when changing the ISM mounting height, measuring distance, polarization has not yet been
improved, This paper describes that the basic cause stems on the undefined measure inherent in the current measurement
system and proposes how to improve this through making free space the test site.
Index terms:
EMC, ISM equipment, metallic floor, undefined measure, free space, U-site
EMCJ99-88, MW99-140
(1999-10)
Transient Analysis
of Lossy Nonuniform Transmission Line Using the Finite Difference Time Domain Method
Toshikazu Seklne*, Kunikatsu Kobayashi**, and Senji Yokokawa***
*Faculty of
Engineering, Gifu University
**Faculty of
Engineering, Yamagata University
***Faculty of
Engineering, Chubu University
*Gifu-shi 501-1193,
Japan
**Yonezawa-shi
992-8510, Japan
***Kasugai-shi
487-0027, Japan
Abstract: A method of applying the FDTD method to the lossy
nonuniform transmission line is described. The step response of the parabolic transmission line is analyzed, and
the effectiveness of this method is confirmed compared with an analytical solution.
Index terms:
lossy nonuniform transmission line, transient analysis, FDTD
EMCJ99-89
(1999-11)
Induced Voltage
on the Home Use Wiring in the Vicinity of MF Broadcasting Transmitting Station
Tsutomu Inada, Hirokuni Nagato*, and Kazuhisa Yoshida
Corporate Quality
R&D Center, Matsushita Electric Works, Ltd.
*Quality Evaluation
Technology (Tsu) Department, Matsushita Electric Works, Ltd.
1048, Kadoma,
Kadoma, Osaka 571-8686, Japan
* 1668, Fujikata,
Tsu, Mie, 514-8555, Japan
Abstract: There are some cases that the strong electromagnetic
field caused by the closely located broadcasting antenna lead a malfunction to an electronic equipment. In this
report, the induced voltage was calculated from the measured common mode current on the electrical wiring of the
general residential area in the vicinity of MF broadcasting antenna. It was found that the value of the induced
voltage was much higher than the level set in the global standard. Looking at the relationship between the EUT's
common mode impedance and the common mode current, we tried to reproduce the same environmental conditions. As
a result, we achieved to trace the same malfunction by the test in the screened room.
Index terms:
medium frequency broadcasting wave, induced voltage, common mode current, immunity, malfunction
EMCJ99-90
(1999-11)
Suppression
of Scattering Waves from Long, Thin Metal Rod by Magnetic Material Coating
Kenichi Hatakeyama and Kenji Yamauchi
Department of
Electronics, Faculty of Engineering, Himeji Institute of Technology
2167 Shosha,
Himeji, 671-2201 Japan
Abstract: Scattering waves from long, thin metal rod consist
3 main components; backward scattering at normal incidence , backward and forward scattering at oblique incidence.
These scattering waves can be suppressed by magnetic material coating on the rod. The relationship between suppression
for each component and permeability, thickness of the magnetic material is studied by numerical and experimental
approaches.
Index terms:
Scattering waves, Long thin metal rod, Magnetic material
EMCJ99-91
(1999-11)
A Radio Propagation
Modeling and it's Electromagnetic Characteristics on Bridge
Kenji Yamauchi, Kenichi Hatakeyama, and Naonori Morishita*
Faculty of Engineering,
Himeji Institute of Technology
*Hanshin Express
Public Corporation
Abstract: Recently, the vehicle Information and communication
system is available on expressway. It will trend toward more higher information rate and the performance will degrade
by multi-path interference. We observed the fairly interfered waves from roadside on the certain bridge. For the
side wall and vertical beams of bridge, we are modeling as a series of vertical stripe shape with reflection material.
The radio propagation losses between radio beacon and receiver are calculated by ray tracing method. We compared
the calculated one with measured data and then tried to discuss the relation of signals and interference components
by using delay profile.
Index terms:
radio propagation on bridge, multi-path interference, delay profile, ray tracing method
EMCJ99-92
(1999-11)
A Method of
Suppressing EMI from Printed Circuit Boards by Automatic Placement, Based on Limited Length of Critical Nets
Shin-Ichi Tanimoto, Takeshi Nakayama, Hiroshi Ikeda, Shinji
Mlura, Yukihiro Fukumoto, and Hirokazu Uemura
Multimedia Development
Center, Matsushita Electric Industrial Co., Ltd.
1006 Kadoma,
Kadoma City, Osaka 571-8501
Abstract: In recent years, EMC design for printed circuit
boards (PCB), which execute layout design by taking account of EMC constraints, becomes important. The principal
process of EMC design is placement of components, since quality of EMC layout depends heavily on the position of
components. In this report, the method of suppressing EMI from PCB by automatic placement is presented. At first,
EMI from signal nets are simulated, and the limited length for each signal nets are decided. Then, components are
placed automatically by two phases that are called "EMI balance placement" and "EMI-AI placement". As
a results, simulated EMI peak level from a sample PCB designed by the method reduced remarkably compared to the
layout designed by conventional method.
Index terms:
printed circuit board, CAD, automatic placement, EMI, EMC design
EMCJ99-93
(1999-11)
An Investigation
on Faulty operation of Electric Wheelchair for Electromagnetic Waves
Shigeaki Takahashi and Kazuyuki Asano
National Institute
of Technology and Evaluation
2-49-10, Nishihara,
Shibuya Ward, Tokyo 151-0066, Japan
Abstract: Recent cases have been reported where electromagnetic
waves cause faulty operation of electric wheelchairs. In order to investigate the malfunction causes of the wheelchairs
for electromagnetic waves, we conducted RF (radio frequency) immunity tests and near-field exposure tests by a
radiotelephone. The former tests have revealed that the RF radiation reduces the wheel speed, which is due to RF
noises entering the speed control circuit from the harness cable. Through the latter tests applied to the harness
part, therefore, we tried to specify the above-mentioned causes, by comparing the speed control voltages in normal
and abnormal states of the wheelchair. As a result, we found that the RF electromagnetic waves decrease the DC
output voltage of an operational-amplifier voltage-follower supplying a reference voltage for the speed control
circuit, which makes the safety circuit work in a slowdown mode. It was also found that the slowdown phenomenon
is caused by the reduced DC anode voltage of the diode for the snubber circuit incorporated in the speed control
circuit.
Index terms:
Electromagnetic wave, electric wheelchair, faulty operation, immunity test, operational amplifier
EMCJ99-94
(1999-11)
Load Effect
of Ferrite Core Attachment to Close Spaced Multiwires above a Ground Plane
Tetsuya Maekawa, A1 Zaher Samir, and Osamu Fujiwara
Faculty of Engineering,
Nagoya Institute of Technology
Gokiso-cho,
Showa-ku, Nagoya 466-8555, Japan
Abstract: Ferrite cores are commonly used to reduce the radiated
emissions from electronic information devices and also to improve the system immunity, while the effects for the
latter case are not being fully elucidated. This is due to lack of understanding on the load effect produced by
a ferrite core attachment. From this viewpoint, we previously analyzed the load effect caused by attachment of
the ferrite cores to a cable or a wire above a ground plane, and proposed equivalent circuits for the load effect.
In this paper, a two-wire transmission line with the ferrite core attachment was analyzed to obtain an equivalent
circuit for the load effect. Under the assumption that the ferrite core attached to the lines acts only on the
common-mode transmission, the resultant equivalent circuit was derived. Based on this finding, the far-end and
near-end crosstalk between the two-wire transmission line was calculated from the transmission line theory, which
was confirmed experimentally.
Index terms:
Immunity, two-wire transmission line, ferrite core, load effect, crosstalk
EMCJ99-95
(1999-11)
Effect of Installing
Magnetic-Polymer-Composite Sheeting on Transmission Line to suppress Conducted-Electromagnetic Noise
Fumishiro Tsuda*,Hiroshi Ono**, Shinichi Shinohara*, and Risaburo
Sato*
*Electromagnetic Compatibility Research Laboratories Co.,
Ltd.
**Tokin Corporation
*6-6-3, Minamiyoshinari Aoba-ku, Sendai, 989-3204 Japan
**Kawasaki Japan
Abstract: Magnetic-polymer-composite sheeting is used to suppress
radiated electromagnetic noise generated by electronic equipment. The sheeting is a combination of a soft-magnetic-metallic
powder and a polymer. Installing this sheeting on transmission lines on substrates attenuates the conducted-electromagnetic
noise. In this report we describe the change in transmission line characteristics due to the installation of the
sheeting, and the attenuation of high-GHz-conducted-electromagnetic noise by the sheeting.
Index terms:
Electromagnetic noise, Transmission line, Magnetics, Magnetic-polymer-composite sheeting
EMCJ99-96
(1999-11)
Investigation
on a Method for Increasing the Antenna Radiation Efficiency Using a Reflector Located Near a Dipole Antenna
Eiji Hankui*, Shinichiro Nishizawa**, and Osamu Hashimoto**
*NEC Corporation,
EMC Engineering Center
** Aoyama Gakuin
University
*4-1-1, Miyazaki,
Miyamae-ku, Kawasaki, Kanagawa 216-8555, Japan
**6-16-1, Chitosedai,
Setagaya-ku, Tokyo 157-8572, Japan
Abstract: This paper proposes an application of a reflector
located near an antenna for increasing antenna radiation efficiency of cellular telephones. In our study, a half
wavelength dipole antenna is used as a cellular phone model, and a cylindrical phantom model with a human head-sized
is treated. By evaluating the radiation efficiency by using FDTD method, an optimum material for the reflector
is selected for increasing the radiation efficiency, and the index of material constant for developing is revealed.
Index terms:
antenna Phantom model, antenna radiation efficiency, reflector, FDTD method
EMCJ99-97
(1999-11)
Fundamental
Study on Physiological Change Associated with ELF Electric Field Exposure -
Possibility of Blood Flow Change in Human Body Surface -
Hisae Oshimizu, Junji Arisawa, and Koichi Shimizu*
Hokkaido lnstitute
of Technology
*Graduate School of
Engineering Hokkaido University
7-15-4-1, Maeda,
Teine-ku, Sapporo, 006-8585, Japan
Abstract: To investigate the biological effect of an electric
field, a fundamental study was conducted on the human physiological change associated with electric field exposure.
The change in the surface blood flow was detected, when a strong electric field was exposed on the forearm, In
experiments, the dependence of the blood flow change on various physical factors was investigated. The results
suggest the close connection between the blood flow change and the filed perception.
Index terms:
Human effect, ELF Electric field, Detection threshold, Safety standard, Physiological effect, Blood flow change
EMCJ99-98
(1999-11)
Evaluation
of Anechoic Chamber Characteristics Using Spherical Dipole Antennas as Imitated Sources
Shikou Matsushima* Yasuhiro Ishida**, and Masamitsu Tokuda*
*Kyusyu Institute
of Technology
**Fukuoka Industrial
Technology Center
*1-1 Sensui-Cho,Tobata-Ku,
Kitakyusyu-Shi 804-8550, Japan
**3-6-1, Norimatsu,Yahatanishi-Ku,Kitakyusyu-Shi
807-083l, Japan
Abstract: Two spherical dipole antennas were used as imitated
sources to evaluate the characteristics of an anechoic chamber. It was shown to be able to achieve various radiating
pattern by controlling the phase between two spherical dipole antennas. Moreover, the correlation of fully anechoic
chamber and semi anechoic chamber was examined, and then a tendency different from the theoretical NSA was obtained.
Therefore, it has been understood that the imitated sources have a possibility that the characteristics not to
be covered by the standard dipole antenna can be evaluated.
Index terms:
Spherical dipole antenna, Imitated sources, Anechoic chamber, Emission measurement
EMCJ99-99
(1999-11)
Analyzing and
Improving Characteristics of Anechoic Chamber Using Ray Tracing Method
Mamiko Inokuchi*, Eiju Kimura**, and Masamitsu Tokuda*
*Kyushu Institute
of Technology
**NTT Lifestyle
and Environmental Technology Laboratories
*1-1 Sensui-Cho,
Tobata-Ku, Kitakyusyu-Shi
804-0855, Japan
**9- 11, Midori-cho
3-Chome Musashino-shi, Tokyo 180-8585 Japan
Abstract: When adding pyramidal carbon absorbers on absorbers
composed of ferrite and foamed ferrite in order to expand the characteristics of an anechoic chamber to the frequency
range from 10 GHz to 20 GHz, there is problem that the NSA characteristics at frequency around 200 MHz are worsened.
An improvement by decreasing material constant of pyramidal carbon was investigated by the ray tracing method.
By making the material constant of pyramidal carbon decrease by 20% or less, it is revealed that degradation of
the characteristics at frequency around 200 MHz was suppressed, keeping the NSA characteristics above 1GHz.
Index terms:
Anechoic chamber, Pyramidal absorbers, Site attenuation, Ray tracing method
EMCJ99-100
(1999-11)
Non-Woven Fabric
Type EM-Wave Absorber Containing Metal Fibers
Tohru Iwai *, Masato Yoshizawa**, and Hidekazu Nakata**
*Systems &
Electronics R & D Center, Sumitomo Electric Industries, LTD.
**Kanto Wire
Products Corp.
*1- 1- 3, Shimaya,
Konohana-ku, Osaka, 554-0024
**2- 5-12, Nishi-Kawada-Minami,
Utsunomiya- shi, 321-0155 Japan
Abstract: Non-woven fabric type EM-wave absorber containing
metal fibers is developed. The complex permittivity of the material depends upon not only the amount of the metal
fibers , but also the length of the metal fibers which are cut for mixing and fabricating. 2-layered EM-wave absorber
is fabricated, and its characteristic is as same as calculated characteristic.
Index terms:
EM-wave absorber, metal fiber, non-woven fabric