EMCJ2000-1
(2000-04)
1/f Noise and Tunnel Resonance by Interaction
Coulomb Force between Electrons
Masanobu
BAN
Tokyo Metropolitan Southern District Small and
Medium-sized Business Promotion Center
l-20-20 Minamikamata,Ohta,Tokyo,144-0035,Japan
TEL: 03(3733)6233
E~mail:banm0k@mail.iri.metro.tokyo.jp
Abstract:
1/f Noise, that amplitude of the wave was in inverse proportion to frequency
value of alternating current, might appear when an electric current flowed
through the vacuum tube. The reason of the noise was the resonance which
interacted between electrons. Electrons were at constant positions that opened
an interval and had lined up. These electrons made Kronig Penny's potential
barriers. And there were another electrons flowing to the anode at same time. I
consider the 1/f noise rose up by tunnel resonance because these two kinds of
electrons gave influence mutually.
Key words: l/f noise, spectral density, soliton,
interaction, transition probability, electron, tunnel effect
EMCJ2000-2
(2000-04)
A Radiation Noise Reduction Technique in Small
Size Notebook Computer Systems
Tsutomu
Hara, Mariko Kasai, Hitoshi Yokota*, Takashi Maruyama*,
and Hideki Itokawa*
System Development Laboratory, Hitachi, Ltd.
292 Yoshida-cho,Totsuka-ku,Yokohama,244-0817,Japan
* PC Division, Hitachi, Ltd. 810 Shimoimaizumi,
Ebina-shi, Kanagawa 243-0435, Japan
Abstract:
Small size Note-type PC becomes a major Product in PC products today. Because
of' its size and thickness, the Battery-pack of Note-type PC is usually a
columnar shape and located on the back of the Note-type PC. In the
battery-pack, wiring to positive and negative poles are branched at the center
of the buttery, then they form a strong radiation source as a dipole antenna.
As a countermeasure against that radiation mechanism, a means of connecting
each electrode to ground at a high
frequency was provided. The effect was over 15dB for reducing radiated noise.
Key words: Printed Circuit Board, Note Type PC,
Battery, Radiation Noise
EMCJ2000-3
(2000-04)
A Simulation Of High
Frequency Current from LSI On Printed Circuit Board
Yuichi
MABUCHl*, Tohru HAYASHl**, Shigenori OHTAKE*, Shinji SHIRAKAWA*, Hideshi
FUKUMOTO*, Atsushi NAKAMURA*, and Gohichi YOKOMIZO **
* Hitachi Research Laboratory, Hitachi, Ltd.
Omika-cho 7-chome, Hitachi-shi, Ibaraki-ken,
319-1292, Japan Phone : +81 294 52 5111 Fax : +81 294 52 7948
** Semiconductor & Integrated Circuits Div.,
Hitachi, Ltd.
20-1 Jousuihon-cho, 5-chome, Kodaira-shi,
Tokyo-to, 187-8588, Japan Phone : +81 42 320 7300 Fax : +81 42 327 8631
E-mail :
ymabuchi@hrl.hitachi.co.jp
Abstract:
A technique to simulate high frequency current on power and ground planes of
printed circuit boards(PCB's) due to high speed switching of LSI’s has been
developed. The electromagnetic characteristics of multilayered and complicated
shaped PCB patterns are modeled using coupled simulation between finite element
current distribution calculation and circuit calculation. The technique is
applied to power-bus-decoupling method. The result of simulation agrees with
measurement with average 1.2dB difference (maximum difference is
4.0dB).
Key words: High
Frequency Current, Electromagnetic emission, EIVII , Printed Circuit Board, LSI,
Simulation
EMCJ2000-4
(2000-04)
A New Description for
Model of LSI at Power Supply Terminal for EMI Simulator
Masashi
OGAWA, Hiroshi WABUKA, and Hirokazu TOHYA
EMC Engineering
Center, Production Technology Laboratories, NEC Corporation
1-1, Miyazaki 4-Chome, Miyamae-ku, Kawasaki,
Kanagawa 216-8555, JAPAN
TEL: +81-44-856-2376 E-mail: m-ogawa@bk.jp .nec.com
Abstract:
For models of LSI at power supply to simulate for EMI, we proposed a
variable-resistor-model which is composed of variable resistors and load
capacitors. In this report, we invent a new description using variable
resistors composed of power supplies and resistors and switches, and load
capacitors calculated by a current at power supply terminals on LSI, and the
simulated values of current spectra in the power supply line of a PCB using the
proposed model agreed well with the measured values.
Key words: LSI model at power supply terminals,
simulation, variable resistor
EMCJ2000-5
(2000-04)
Estimation of
Electromagnetic Noise from Digital IC by Using Small Size TEM Cell
Masahiro
Takahashi, Masakazu Fujita, Satoshi Kazama, Shinichi Shinohara,
and Risaburo Sato
Electromagnetic Compatibility Research
Laboratories Co., Ltd.
6-6-3 Minamiyoshinari Aoba-ku Sendai-shi
989-3204
TEL 022-279-3781 E-mail:taka@emc-1.co.jp
Abstract:
This paper describes a method for measuring
adjacent electromagnetic fields from digital ICs using small size TEM cells.
This method calculates the adjacent electric and magnetic fields from the IC by measuring the outputs from the
TEM cell in a four-directional setup of the device under test (DUT). The method
is verified by using micro-strip lines as the DUT. The adjacent magnetic field
from the digital IC as measured by this method agrees with the adjacent
magnetic field as measured by a magnetic probe (shielded loop). This method is
effective for evaluating adjacent electromagnetic fields from digital ICs.
Key words : Digital IC, Electromagnetic noise,
EMI, Measuring method, Evaluation method
EMCJ2000-6
(2000-04)
A Study on Measurement of Complex Permittivity
of Dielectric Sample using Rectangular Cavity Resonator by FDTD Method
Koji
Shibata*, Hirofumi Inagami*, Osamu Hashimoto*, and Takeshi Takahashi**
Dept. of Electronics and Electrical Engineering,
Aoyama Gakuin University
* * Materials Research
Center, TDK Corporation
6-16-1 Setagaya-ku Chitosedai Tokyo,157-8572
JAPAN Phone & Fax : 03-5384-1121
E-mail : shibata@ee.aoyama.ac.jp inagami@ee.aoyama.ac,jp hasimoto@ee.aoyama.ac.jp
Abstract:
In this study, the author presents the non-destructive measurement method that
the imaginary part of the complex permittivity of thin dielectric sample which
conforms the slit of the cavity resonator is estimated. In the present study, the
author calculates the quality factor using finite difference time domain
(FDTD)method, on condition that a thin sample is inserted into the rectangular
cavity resonator. The excellent agreement is obtained between calculation and
measurement, where the variation of the absolute reflection coefficient between
them, is about 9 percent. The author provided here the measurement chat by the
relation between the quality factor calculated by FDTD method and the imaginary
part of the permittivity, and then the measurement chart could be used for
practical measurement.
Key words: non-destructive measurement,
Rectangular Cavity Resonator, Complex Permittivity, Error
EMCJ2000-7
(2000-04)
A Study on the Door Seal Structure of Microwave
Oven with Inserted Sheet Type Lossy Material Using FDTD Method
Kouta
Matsumoto, Yuusuke Kusama, and Osamu Hashimoto
Dept. of Electronics and Electrical Engineering,
Aoyama Gakuin University
Setagaya-ku Chitosedai
6-16-1 Toky0,157-8572 JAPAN Phone & Fax : 03-5384-1121
E- Mail : kouta@ee. aoyama. ac. jp yuusuke@ee. aoyama. ac.jp hasimoto@ee.
aoyama. ac . jp
Abstract:
In this paper, a shielding effectiveness (SE) is examined by finite difference
time domain (FDT]D) method of 3-dim under the use of a lossy material inserted
into the gap instead of the conventional choke structure, as a method for
suppressing a leakage waves from the gap between the main body of a microwave
oven and a door. Concretely, the SE versus the variation of the gap size or the
insertion length of the lossy material is examined on TE40 mode
which is similar to the leakage wave in various higher-modes. It was found out
that the SE of 30dB or more was obtained in the case that some lossy material
filled up the gap. If the gap becomes 1mm, the insertion length of the lossy
material of 50mm or more is necessary to obtain the SE of 30dB or more. It was
confirmed quantitatively that the desired SE for practical use was obtained by
using the new door seal structure.
Key words: Microwave oven, Lossy material,
Shielding effectiveness, FDTD method
EMCJ2000-8
(2000-04)
A Simple Method for Measuring a Complex
Permittivity of Powders using Standing Wave Method on a Rectangular Waveguide
Keisuke
Kagiwada, Koji Tsuzukiyama, and Osamu Hashimoto
* College of Science and Engineering, Aoyama
Gakuin University
* Mitsui Chemicals, Inc.
Setagaya-ku Chitosedal
6 16 1 Tokyo, 157-8572 JAPAN Phone & Fax : 03-5384-1121
E-Mail : kagi@ee.aoyama.ac.jp,
Koji.Tsuzukiyama@mitsui-chem.co.jp, hasimoto@ee.aoyama.ac.jp
Abstract:
In this paper, a method for measuring a complex permittivity of a powder sample
is proposed based on the standing wave method on a rectangular waveguide for
measuring a complex permittivity in microwave band. The complex permittivity of
the powder sample, e.g., polyethylene powder and silica powder, was measured by
inserting the sample box made of the teflon filled with the powder sample into
the waveguide. The influence of the air existed between the particles of the
powders was removed by the corrective equation derived from Mossotti-Clausius'
equation, and then only the complex permittivity was estimated. The
effectiveness of the present method of measurement was confirmed by comparing
the powder sample with the measured result of the solidificated sample. In the
case of the real part of the complex permittivity, there was a difference in
the first decimal place. The estimation of the imaginary part was also carried
out under the accuracy with the difference appeared in the second decimal
place. It was shown that the effectiveness of our present method for measuring
the complex permittivity of the powder.
Key words: Rectangular Waveguide, Complex
Permittivity, Powder
EMCJ2000-9
(2000-04)
Uncertainty Evaluation
of Dosimetry in Small Animals for an In-vivo Local Exposure Setup
Takashi
Saito, Jianqing Wang, and Osamu Fujiwara
Faculty of Engineering, Nagoya Institute of Technology,
Gokiso-cho Showa-ku, Nagoya 466-8555, Japan
Abstract:
We previously developed an in-vivo
exposure setup for testing the possible promoting effects of 1.5GHz digital
cellular phones on mouse skin carcinogenesis. In this report, we analytically
and experimentally evaluated the uncertainty of SARS inside the mouse in the
exposure setup, which should be affected by the presence of an acrylic holder
for restraining the mouse as well as the movement of the mouse in the holder.
The artifact of peak SAR obtained in one cell by FDTD analyses was also
investigated. As a result, we found that (1) the peak SAR was increased 16% due
to the presence of holder, (2)the peak SAR in one-FDTD cell normally determined
from the considered wavelength was overestimated up to 17% in comparison with
that spatially averaged from the one-eighth size FDTD cell. In addition,
simultaneous measurements of the antenna input and reflection powers revealed
that the peak and average SARs vary within ±7%
due to the movement of mouse, which do not almost depend on the mouse weight.
Key words: cellular
phone, biological effect ,in vivo experiment, exposure setup, uncertainty
evaluation
EMCJ2000-10
(2000-05)
Electromagnetic Noise Characteristics between
Two Unshielded Twisted-Wire Pair for the Number of Twist.
Naoki
YAMAMOTO*, Yoshifumi SHlMOSHIOf*, Hiroaki KOGA*, and Masamitsu TOKUDA* *
Department of Information and Communication
Engineering, Kumamoto National College of Technology,
2659-2, Suya, Nishigoshi, Kikuchi, Kumamoto,
861-1102 Japan TEL: 096-242-6069 e-mail: naoki@tc.knct.ac.jp
* Department of
Electrical Engineering, Kyushu Institute of Technology,
l-1, Sensui, Tobata, Kitakyushu, 804-8550 Japan
Abstract :
This report describes an inducing mechanism of the electromagnetic noise between
a generator twisted pair cable and a receptor twisted pair cable above ground.
We have derived a calculation method using chain matrices for the induced
voltage on the receptor twisted pair cable. In this report, we have predicted
the electromagnetic noise characteristics between two twisted pair cables for
a, LAN cable. The report shows the calculated electromagnetic noise
characteristics for pitch, cable length, and cable height theoretically.
Key words :Twisted
pair cable, Pitch, Induced voltage
EMCJ2000-11
(2000-05)
A Study on LCTL and
Radiated Emission for Balanced Cable
Seiji
HAMADA*, Tetsuya KAWASHIMA*, Masahiro MAKI***, Naoki YAMAMOTO**, Yoshifumi
SHIMOSHIO**, and Masamitsu TOKUDA*
*Graduate School of
Kyushu Institute of Technology
1-1,Sensui-cho, Tobata-ku,Kitakyushu 804-8550,
Japan TEL : 093-884-3258 E-mail : seiji@buddy.elcs.kyutech.ac.jp
** Dept. of Information and Communication Eng.
Kumamoto National College of Tech.
2569-2,SUYA,Nishigoshi-machi,Kumamoto-ken
861 - 1102,Japan
*** Matsushita Electric Industrial Co. Ltd.
Kyushu Multimedia Systems Research Laboratory
693 -47,kawatsu,
Iizuka, Fukuoka-ken 820-0067, Japan
Abstract:
We investigated LCTL(Longitudinal Conversion Transfer Loss) and radiated
emission characteristics for the few kHz to MHz using the twisted pair wire in
UTP Category 5. First, we inserted the unbalance elements to imitate on a
terminal equipment and measured the LCTL and radiated emission. As the result,
it can be seen that the LCTL becomes worse for inserting unbalance element and
the radiated emission increases. Second, we analyze the wire height dependency
and the line length dependency of the radiated emission. As the result, it has
been understood that the radiated emission increases as the wire height rises
and become a shape of waves with the cycle corresponding to the line length.
Key words: Balanced Cable LCTL Radiated Emission
Chain Matrix
EMCJ2000-12
(2000-05)
Reduction Characteristics of Common Mode
Effective Power on Metallic Lines When Putting a Thin Metal Plate Close to Them
Tsuyoshi
IDEGUCHI, Yasuo IDETA, and Yukinobu YAMAKITA
School of Engineering Kyusyu Tokai University
9-1-1 Toroku, Kumamoto-shi, 862-8652 Japan
E-mail : tideguti@ktmail.ktokai-u.ac.jp
Abstract :
This paper investigates the reduction characteristics of effective power
propagating on common mode circuit between metallic lines and the earth when a
thin metal plate is put close to these lines partially. As a result,
outstanding reduction effect is observed over several hundreds MHz when the
thickness of the metal plate is quite less than skin depth at concern frequencies. And the shape of the
metallic plate such as width and length has influence on the reduction
characteristics. If large reduction effect is necessary at a certain frequency,
the length of metal plate can be adjusted to a appropriate length by slitting.
This reduction effect is not obtained by the reflection of the effective power,
but obtained by traveling the effective power from lines -earth circuit to
metal p]ate-earth circuit. This phenomena could be used as a reduction method
of conducting noise on metallic lines installed in the building or in the
equipment.
Key words: Metallic
pair lines, Effective power, Metallic evaporated sheet Conducted noise
reduction effect
EMCJ2000-13
(2000-05)
Visualization of
Radiated Emission Sources Using CISPR Measurement System
Yasuhiro
Ishida*, Yuichi Yamaguchi**, Kouji Yamashita***, and Masamitsu Tokuda**
Mechanics &
Electronics Research Institute, Fukuoka Industrial Technology Center
3-6-1 Norimatsu, Yahatanishi-Ku. Kitakyushu-Shi
807-0831, Japan
Phone: 093-691-0260
Facsimile: 093-691-0252 E-mail: ishida@fitc.pref.fukuoka.jp
** Kyushu Institute of Technology
1-1 Sensui-Cho, Tobata-Ku, Kitakyushu-Shi
804-0015, Japan
*** NEC corporation
1131 Hinode, Abiko-Shi, 270-1198, Japan
Abstract:
Relating to the radiated emission sources finding method utilizing only
amplitude data in CISPR emission measurement system, we propose a new finding
algorithm in which estimated sources are equally placed and fixed. This makes
it unnecessary to repeat the calculation for selecting optimum initial
positions and determining the total current number, thus it raises the
calculation efficiency and stabilizes the finding estimation. As the results of
computer simulation, it is shown that current sources can be accurately
visualized even when many sources exist, or sources are continuously
distributed, furthermore estimated values show good agreement with the original
ones in experimental verification by using two spherical dipole antennas.
Key words: radiated
emission, CISPR measurement system, sources finding method, anechoic chamber
EMCJ2000-14
(2000-05)
Electrical Power Feeding
Technique by Optical Energy Using an Optical Fiber
Takahiro
Nango, Kazunori Hano, and Masamitsu Tokuda
Faculty of Engineering, Kyusyu Institute of Technology
1-1Sensui-cho, Tobata-ku, Kitakyusyu, 804-8550,
Japan
TEL : 093-884-3285 E-mail :
nango@buddy.elcs.kyutech.ac.jp
Abstract:
Electrical power feeding technique for a imitated equipment including O/E
converter, in which optical energy is transmitted by optical fiber and
converted to electrical energy by a solar cell, is investigated. The short
circuit current density of a solar cell increase in proportion to optical power
even when optical power with high density such as 10 W/cm2 is
illuminated. Therefore, it is cleared that required electrical power could be
obtained on small size solar cell. Moreover, it is understood that the decrease
in the short circuit current can be suppressed by connecting the bypass diode
even if solar cells connected in series are not illuminated uniformly.
Key words: Imitated
equipment, Optical fiber, Solar cell, Short circuit current, Bypass diode
EMCJ2000-15
(2000-05)
Comments on Epidemiologic Papers Related to
Childhood Leukemia and Magnetic Fields of Power Lines (Part 7) - Some Doubts on an Epidemiological Paper
(June 1999) based on a Study in Ontario, Canada -
Yoshifumi
AMEMIYA
Kanazawa Institute of Technology Kanazawa-South,
Ishikawa-ken, 92 1.-8501 Japan
Abstract: An epidemiological paper is
different in a character from a paper of an experimental science, such as a
technological paper. It should be constructed at safety side, that is, it
should be written from the standpoint that any one of the potential causes of
disease in question does not be omitted, while there are some possible doubts
on the propriety of an assumption as a presume and on the logically of a
reasoning in Its description. We the electrical persons concerned. should make
a careful examination of these doubts and take measures to inform persons of a
thing when we can not remove these doubts. A newspaper, according to the paper published in June 1999 by members at
University of Toronto. Canada and others, said that a risk of childhood
leukemia at the power-line magnetic fields higher than 0.7mG is about four
times the risk at lower than 0.3mG In this report, we give an outline and make
an examination of this. paper.
Key words: magnetic
field /childhood leukemia /cancer/ epidemiological paper
EMCJ2000-16
(2000-05)
Current and Voltage
Distributions of Digital IC Package in the High-frequency Range above 1GHz
Satoshi
Kazama, Shinichi Shinohara, and Risaburo Sato
Electromagnetic Compatibility Research
Laboratories Co., Ltd.
6-6-3 Minamiyoshinari Aoba-ku Sendai-shi
989-3204 TEL 022-279-3781 E mail :kaze@emc-l.co.jp
Abstract:
Simultaneous measuring method for adjacent electric and magnetic field
distributions was proposed. This method is able to apply at frequencies that
exceed 1GHz, because it allows the use of a small probe with high
self-resonance frequency. Digital IC current and voltage distributions were
measured at GPS frequency using this method as example. It is shown that the
measured distributions can be used to estimate effective positions for
anti-adjacent-interference in the IC. This method is effective to evaluate
interference by adjacent electromagnetic fields.
Key words:
Digital IC, Electric field distribution, Magnetic field distribution, Adjacent
electromagnetic field interference, GPS
EMCJ2000-17
(2000-05)
Suppression Effect of
the Emission from a Printed Circuit Board Using a Ferrite Plate
Teruo
Tobana*, Qiang Chen**, Kunio Sawaya**, Takayuki Sasamori*,
and Kohshi Abe*
Dept. of Electronics and Information Systems,
Akita Prefectural Univ.,Honjou,015-0055,Japan
** Dept. of Electrical and Communication
Engeneering.
Tohoku Univ., Aoba-ku, Sendai, 980-8579 , Japan
phone ; 0184-27-2226 E-mail : tobana@akita-up.ac.jp
Abstract:
Radiated emission from a printed circuit board (PCB) is a serious topic in a
field of EMC/EMI. In order to
suppress the radiated emission it is used some type of electromagnetic absorber,
such as ferrite plates or carbon plates. To investigate the appropriate use of a ferrite plate,
we analyze the suppression effect of a ferrite plate that is placed nearby a
PCB with a microstrip line. Frequency dependent finite different time domain
(FD-FDTD) method is used as an analysis method. The calculated results show
that the suppression effect is achieved by the ferrite plate placed at a large magnetic
field intensity. In the case of a PCB with a finite ground plane, the
suppression effect is achieved by the ferrite plate placed on the ground plane
opposite side of a microstrip line.
Key words: PCB
Ferrite, FD-FDTD, EMI, Emission
EMCJ2000-18
(2000-05)
A Basic Study of a
Sheet Type Wave Absorber Using Carbon Micro-coils
Norikazu
Tomonari*, Osamu Hashimoto*, and Seiichi Takaoka**
* College of Science and Engineering, Aoyama
Gakuin University
6-16-1 Chitosedai
Setagaya-ku Tokyo,157-8572 JAPAN Phone & Fax. : 03-5384-1121
E-Mail : tomonari@ee.aoyama.ac.jp,
hasimoto@ee.aoyama.ac.jp
** Nitto Denko
1-11-2 Osaki Sinagawa-ku Tokyo,141-0032 JAPAN
Phone : 03-5384-1121 Fax. : 03-5740-2260
Abstract:
This paper is to study the realization of a single-layer type rubber sheet wave
absorber at X and V bands using carbon micro-coils paid attention as a new
industrial material.
First of all, a complex permittivity of
a dielectric material with carbon micro-coils was measured at X band under the
change of a content and a length of the carbon micro-coil. And then the new
wave absorber at X band was fabricated based on these measured results. As a
result, the wave absorber using carbon micro-coils realized at X band, where
the absorption of 20dB or more was obtained under the frequency between 9.4 and
10.7GHz and the incident angle ranging from 0 to 40 degrees.
From the measured result of the
presented absorber at V band based on the result mentioned above, it, was also
shown that the realization of the millimeter-wave absorber with the absorption
of 20dB or more under the frequency between 56.0 and 60.0GHz and the incident
angle ranging from 10 to 35degrees.
Key words: carbon
micro-coil, wave absorber, X-band, V-band
EMCJ2000-19
(2000-05)
Absorption
Characteristics of Organo-ceramics Containing Ferrite Powder
Hiroki
Anzai* and Dinil Puspalal**
Tsuruoka National College of Technology ; 104,
Aza Sawada Ooaza Inooka, Tsuruoka, Yamagata, 997-8511
Phone:0235-25-9064
E-mail :anzai@tsuruoka-nct. ac. Jp
** Maeta Techno-Research, INC. ; 6-7,
Kamihoncho, Sakata, Yamagata-ken, 998-8611
Phone : 0234-23-5022
Abstract:
This paper reveals the absorption characteristics of a newly developed
electromagnetic absorber. The absorber is a quasi--incombustible organo-ceramic
which containing ferrite powders, cement and phenol resin. The return loss is
higher than 20dB in the frequency range of 1 GHz to 8GHz. The effective
frequency range can be changed to desired frequency band by adjusting the
ferrite/cement ratio.
Key words: absorber, ferrite , cement, quasi
incombustible
EMCJ2000-20
(2000-05)
An Evaluation of the
Characteristics for Electromagnetic Wave Absorber Using the Strip Line
Hiroki
Anzai, Ryusuke Sasaki, Yoshihro Saito, and Kouichi lkeda
Tsuruoka National College of Technology ; 104.
Aza Sawada Ooaza Inooka, Tsuruoka, Yamagata, 997-8511
Abstract:
The measurement of shaped electromagnetic wave absorber using coaxial line is
very difficult. On this research, we present an evaluation method of the shaped
absorber by the standing wave method using the strip line. Here we reported
about estimate of the strip line characteristics, return loss of the absorber
and experimental results are discussed.
Key words: Electromagnetic
wave absorber, Shaped Structure, Strip Line, Standing wave method
EMCJ2000-21
(20C0-6)
Numerical Analysis of Electromagnetic Fields
within Rectangular Waveguide by Multi-port Network Theory
Satoshi
ICHIKAWA and Yuuji IMAI
Graduate School of Engineering, Kyoto University
Yoshida-honmachi Sakyo-ku Kyoto 606-8501, Japan
Tel. 075-753-5331 Fax.
075-751-1576 E-mail
ichikawa@kuee.kyoto-u.ac.jp
Abstract: When
the obstacle exists within the waveguide region, electromagnetic fields near the obstacle region requires, in
addition to the fundamental mode, many of non propagating higher order modes.
Propagating fundamental mode can be represented by transmission line model, but
non propagating higher order modes are represented by lumped elements and
electromagnetic fields in, the vicinity of obstacle region can be modeled by
multi-port equivalent circuit. In this paper, we solve this problem by deriving
a numerical solution for the integral equation which give rigorous higher order
electromagnetic fields. We use Galerkin method, which is one of the method of
moments to solve the integral equation.
Key words: rectangular waveguide, obstacle
within waveguide, higher order mode, multi-port network, Galerkin method
EMCJ2000-22
(2000-6)
A FDTD Analysis of
Load Impedance for Microwave Oven Cavity Seen from Magnetron
Takashi
NAGASAKA*, Jianqing WANG* , Osamu FUJIWARA*, Kazuhiro FURUTA**, and Tomimitsu
NODA**
* Faculty of Engineering, Nagoya Institute of
Technology
Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
** Toshiba Home Appliance Company.
991 Anata-cho, Seto-shi, Aichi 489-8610, Japan.
Abstract:
The load impedance of microwave oven cavity seen from a magnetron is a useful
parameter not only for the optimum design in saving development costs and time
but also for the suppression of unwanted emissions due to higher-order
harmonics. From this point of view, we have conducted a computer simulation for
the load impedance of microwave oven cavity using the FDTD (Finite-Difference
Time-Domain) method. The computation modeling was based on a cylindrical
monopole antenna simulating a probe usually used for the impedance test of
microwave oven cavity, which was validated by comparing of the calculated
results with measurement at 2.46GHz.
Key words:
Microwave oven, magnetron, harmonic emission, load impedance, FDTD method
EMCJ2000-23
(2000-6)
A Prediction of
Electric Far-Field Strength Radiated from Printed Circuit Boards by A FDTD
Approach
Kohji
SASABE, Jianqing WANG*, 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 new prediction method for the radiated far-field emission from PCBs (Printed Circuit Boards) with parallel traces was
proposed. An equation for calculating the electric far-field due to common-mode
(CM) currents on the traces being not always electrically short, was
theoretically derived. The FDTD (Finite-Difference Time-Domain) method was used
to compute the CM currents for the electric far-filed prediction. A comparison
of the predicted far-field
strength with the results actually measured for two types of prefablicated
sample PCBs having parallel traces was carried out in order to validate the
above prediction approach. As a result, good agreement was obtained between the
prediction and the measurement in the frequency range from 30 MHz to 1GHz.
Key words: Printed circuit boards, far-field
emission, common-mode current, FDTD method, prediction.
EMCJ2000-24
(2000-6)
Experimental Study of Estimate Free Space
Radiated Emission by using FDTD Analysis and Time Domain Measurement.
Satoru
Kurokawa*, ** and Toru Sato**
*Kyoto prefectural Comprehensive center for small & medium enterprise 17 tyudoji-minamimachi ,
simogyo-ku , Kyoto City , Japan
TEL:075-315-8633
FAX:075-315-1551 Email:kurokawa@mtc.pref.kyoto.jp
** Graduate School of Informatics, Kyoto
University yoshida-honmachi , sakyo-ku , Kyoto City . Japan
TEL:075-753-3362
FAX:075-753-3342 Email:tsato@kuee.kyoto-u.ac.jp
Abstract:
In this paper, we investigate an EMI measurement method which can be carried
out at the places that do not conform the standard of EMI laboratory.
First, we measure the propagation
characteristic of electromagnetic waves in the EMI measurement room, which is used as a reference.
Then, we estimate the measured values in
the EMI measurement room from the values measured in an ordinary laboratory
using the reference values.
We separate the direct wave from measured
values in the laboratory, and applied a numerical scheme that compensate for
the effect of propagation in the EMI measurement room.
The estimated values compared well with
direct measurements in the EMI measurement room.
Key words: EMC,
EMI, Time domain measurement, FDTD Method, Dipole antenna
EMCJ2000-25
(2000-6)
A Basic Study for
Millimeter-wave Absorber Containing the Metal Oxide
Tetsu
Soh* and Osamu Hashimoto**
* Engineering, Aerospace division, The Yokohama
Rubber Co., Ltd.
* * College of Science and Engineering,, Aoyama
Gakuin Univ.
Address: 6-16-1 Chitosedai, Setagaya-ku 157-8572
Tokyo, Japan
Tel: 03-5384-1121, Fax: 03-5384-1121 E-mail:
hasimoto@ee. aoyama.ac.jp
Abstract:
In this study, for realizing a paintable millimeter-wave absorber is aimed. The
properties of epoxy resin, that has a good durability for outside use,
including titanium dioxide and carbon particles are studied in 50-110G Hz. As
this result, a good wave absorber that has the peak absorption over -25dB In a
required frequency between 50GHz to 110GHz with changing thickness and the
frequency band width over 8GHz for absorption over -20dB can be realized to
include 32phr of titanium dioxide and 1phr of carbon particles. The complex
permittivity of this material changes in almost parallel to no reflection curve
as frequency change. Therefore, it is explained that the frequency for the peak
absorption can be controlled to change the thickness of absorber without
changing contents of titanium dioxide or carbon particles.
Key words: millimeter-wave, absorber, titanium
dioxide, carbon particles, epoxy resin
EMCJ2000-26
(2000-6)
Proposal of Susceptibility-Measurement Method
Using Electric and Magnetic Fields Generated in a TEM Cell with Short Circuit.
Kimitoshi
Murano, Kana Sugawara, and Yoshio Kami
The Universitv of Electro-Cornmunications 1-5-1
Chofugaoka, Chofu-shi, Tokyo 182
Tel:+81-424-43-5241 E-mail: kami@ice.uec.ac.jp
Abstract: A
TEM cell for immunity test is usually used in a state of matched circuit load,
where electromagnetic fields play as same as a plane wave. When a TEM cell is
terminated with a short circuit, there is a standing wave in it. This fact
means that the electric or the magnetic fields are dominantely generated at
some specific positions. On the consideration, a susceptibility test method for
small electronics parts is proposed to investigate the coupling mechanism
caused separately by the fields. Characteristics of a trial test set, is
studied experimentally, and as examples, the susceptibility characteristics for
a small microstrip line and a coil are studied.
Key words:
Susceptibility test, short-circuited TEM cell, electric-field coupling,
magnetic-field coupling