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 vi