EMCJ2000-101 (2000-12)
Propagation Characteristics of Electric
Fields Due to an Electrostatic Discharge occurring in a Corridor
Yuko Murase and Osamu Fujiwara
Faculty of Engineering, Nagoya Institute of
Technology
Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
Abstract The electrostatic
discharge (ESD) due to charged metal objects produces the electromagnetic
fields having broad-band frequency spectra over a microwave region, which cause
serious electromagnetic interference to high-tech information equipment. For
this kind of ESD fields, focusing on electromagnetic fields due to the spark
discharge between metal spheres, we previously demonstrated numerically and
experimentally that the existence of metal spheres enhances the field level
according to their sizes. In this paper, we analyzed electromagnetic fields due
to the ESD event occurring in a corridor using the dipole model inside a
rectangular waveguide, and examined numerically the distance dependence of the
field peak for the ESD occurring horizontally to the floor. As a result, we
found that the far-field peak dopes not always decrease with increasing the
distance and that there exists a region in which the field peak is enhanced
with the distance. This finding was also confirmed by the spark experiment of
metal spheres.
Key
words:
Corridor space, electrostatic discharge, dipole model, distance attenuation,
ESD Detector
EMCJ2000-102 (2000-12)
Distance Attenuation of Transient Magnetic
Fields Generated by Spark Discharge between Charged Metal Spheres
Motonobu Funato, Hideaki Seko, and Osamu
Fujiwara
Faculty, of Engineering, Nagoya Institute of
Technology
Gokiso-cho, Showa-ku, Nagoya 466-8555,
Japan.
Abstract The ESD (electrostatic discharge) between
charged metals generates transient electromagnetic fields having broadband
frequency spectra, which often gives a fatal EMI (electromagnetic interference
) to high-tech information equipment. For the EMI of this kind, propagation
characteristics of ESD fields and electromagnetic coupling between the ESD
fields and equipment still remain unknown. From this perspective, we have
proposed FDTD methods and an image-dipole method to analyze the ESD fields due
to charged metals. The former method, however, is unable to analyze the
propagation characteristics of the ESD field over the broad region because of
the limited analysis space, and the latter is limited for calculation to the
sphere sizes that can keep the equip-potential on the metal surface. In this
paper, in order to investigate the feasibility of our previously proposed
computation methods for the spark discharge between metal spheres, we made a
comparison between measurement and calculation of the magnetic field waveform
and the distance attenuation of the field peak with respect to various kinds of
the sphere sizes. As a result, we could confirm that there is in good agreement
between measurement and calculation for the spark discharge between the metal
spheres with diameters of 3 cm to 10 cm.
Key words:
Charged metal, ESD, transient magnetic field, distance attenuation, spark
experiment, calculation
EMCJ2000-103 (2000-12)
Electromagnetic Absorption and Scattering
Characteristics of Conducting Elliptic Cylinder Coated with Absorber using
Ferrite
Tadahiro Masuda and Yasumitsu Miyazaki
Department of Information and Computer
Sciences, Toyohashi University of Technology,
1-1 Hibarigaoka, Tempaku-cho, Toyohashi,
441-8580 JAPAN
Tel: 0532-47-0111, FAX: 0532-47-0152,
E-mail: miyazaki@emlab.tutics.tut.ac.jp
Abstract The
electromagnetic compatibility characteristics are analyzed for electromagnetic
wave scattering model consisting of an infinite conducting elliptic cylinder
coated with absorber using ferrite. The advantages of using elliptic cylinder
are that the model can be applied to various structures and we can perform the
analysis by expanding the electromagnetic fields in terms of Mathieu functions
on elliptic cylindrical coordinate system. This paper describes the exact
formulation for this model using the Mathieu functions in the free-space region
and the complex Mathieu functions in the absorption region.
Key words:
conducting elliptic cylinder, Mathieu function, absorption coating, ferrite
EMCJ2000-104 (2000-12)
Analysis of Electromagnetic Compatibility
Characteristics of Mobile Communication and Wireless LAN in Buildings by 3-D
FDTD Method
Koichi Takahashi and Yasumitsu Miyazaki
Department of Information and Computer
Sciences, Toyohashi University of Technology,
1-1 Hibarigaoka, Tempaku-cho, Toyohashi,
441-8580 JAPAN
Tel: 0532-47-0111, FAX: 0532-47-0152,
E-mail: miyazaki@emlab.tutics.tut.ac.jp
Abstract The radio
communication systems such as cellular phones and wireless LAN systems have
been developed rapidly in the recent years, and accordingly the electromagnetic
compatibility characteristics in buildings are paid more attention in the
world. In particular, multi-path fading due to various indoor environments
causes delay and interference. Understanding of propagation characteristics of
radio communication waves is necessary to design high performance communication
systems. Ray-tracing method is mainly applied for the analysis of indoor
propagation channels. However, for the analysis of complex indoor environments,
ray-tracing approach cannot give sufficient accuracy. In this paper, FDTD
method is applied to show the electromagnetic compatibility characteristics in
buildings. Results are compared with that of 2-D FDTD method for investigating
of the effect of ceiling and floor of the building.
Key words: mobile
communication, indoor propagation, FDTD Method, electromagnetic compatibility
EMCJ2000-105 (2000-12)
Analysis of Electromagnetic Characteristics
for Mobile Communications in Urban Areas using a Parallel FDTD Algorithm
Glen Rodriguez and Yasumitsu Miyazaki
Dept. of Information and Computer Sciences,
Faculty of Engineering, Toyohashi University
of Technology
Hibarigaoka1-1, Tempaku-cho, Toyohashi,
441-8580, Japan.
Tel: 0532-47-0111, FAX: 0532-47-0152,
E-mail: miyazaki@emlab.tuticstut.ac.jp
Abstract The increasing use of wireless personal
communications and the high density of users in urban areas has created the
necessity of efficient technologies. One subject of interest is the
electromagnetic wave propagation and scattering in large areas, such as the urban
areas. One of the simulation methods to accomplish this study is the FDTD
method, but it is not convenient for large scale problems. In this paper we
discuss a new approach, which transform the Yee's formulas into an equivalent
representation as a system of linear equations. While the formulas are the
same, the algorithm is changed. The coefficient matrix is triangular and no
factorization is required. The algorithm is shown to be able to deal with 2-D
problems in this approach is tested.
key words:
mobile communication, FDTD method, parallel processing, system of linear
equations
EMCJ2000-106 (2000-12)
Study on sensing-stability for Code-sensing
Communication System using a magnetic sensor
Youji Kotsuka and Takayuki Miyagaki*
Department of Telecommunication Engineering
Tokai University
Lab. 8, 2F-BLDG. 9, Dept. of
Telecommunications, shounan-campus, Tokai University
1117 , Kitakaname, Hiratsuka-shi, Kanagawa
259-1292 Japan
Tel: 0463-58-1211(Ex. 4056), E-mail:
ykotsuka@keyaki.cc.u-tokai.ac.jp
Abstract Code-sensing
Communication System (COSCOS) have so far been proposed as a local simple
mobile communication system, particularly from EMC viewpoints.
This paper proposes a new code available for
general mobile communications. Father, to improve the characteristics of the
sensing-stability, Fuzzy inference is introduced
key words: EMC,
magnetic sensor, Code-sensing, communication system, resonance, Fuzzy inference
EMCJ2000-107 (2000-12)
Static and Dynamic Evaluation Methods for a
VDT Periphery Electromagnetic Environment ---Regression and/or Inverse
Regression Models and a Dynamic Digital Filter
Hitoshi Ogawa, Mitsuo Ohta* and Akira
Ikuta**
Hiroshima Natl. College of Maritime Tech.
4272-1,Higashino-Cho,Toyota-Gun,Hiroshima
Pref.,725-0200 Japan
TEL:08466-7-3105, E-mail:
ogawa@hiroshima-cmt.ac.jp
*Emeritus Professor of Hiroshima Univ.
New Life Hiroshima
1106,1-7-10,Motoba,Minami-Ku,Hiroshima-City,732-0824 Japan
TEL:082-262-4678, E-mail:
ohta-3322@mdd.spacetown.ne.jp
**Faculty of Human Life and Environmental
Science, Hiroshima Prefectural Womenfs Univ.
1-1-71,Ujina-Higashi,Minami-Ku,Hiroshima-City
734-8558 Japan
TEL:082-251-9763, E-mail:
ikuta@hirojo-u.ac.jp
Abstract In this paper,
a methodological trial of static and dynamic evaluation for the near-electromagnetic-filed
leaked from an actually working VDT have been proposed. As a static method, in
order to estimate one from another by extracting various interrelation
characteristics between sound and electromagnetic waves, from some phenomenon-oriented
viewpoint, we have proposed 2 kinds of extended regression and
inverse-regression system models reflecting hierarchically not only linear
correlation information of the lower order but also nonlinear correlation
information of the higher order. As a dynamic method, in order to estimate
electromagnetic waves leaked from a specific VDT with an existence of a
background electromagnetic noise in the real environment, from an
operation-oriented viewpoint, we have proposed a practical estimation algorithm
derived by applying the well-known least mean squared method for the moment
statistics with several orders. Finally, the validity and effectiveness of
these proposed methods are experimentally confirmed too by applying them to the
actually observed data.
Key words:
VDT, Electromagnetic environment evaluation, Regression model, Inverse
regression model, Digital filter
EMCJ2000-108 (2000-12)
Influence of Geometric Configuration of
Magnetic Shielding Material Surrounding Single
- Phase Line Current
Katsuyuki Asano, Tomohiro Moriyama, Shinya
Ohtsuka, Mengu Cho, Hong Jin- Woong, and Masayuki Hikita
Department of Electrical Engineering, Kyushu
Institute of Technology
1-1 Sensui-cho, Tobata-ku, kitakyushu,
804-3550 Japan
Phone, FAX :+81-93-884-3241, E-mail: hikita@ele.kyutech.ac.jp
Abstract We investigated extremely law frequency
(ELF) magnetic field arising from asymmetric configuration of a single-phase
cable and a surrounding ferromagnetic (iron) or conductive (aluminum) pipe. As
the result, the magnetic field around the metal pipe was found to be enhanced
and reduced by a factor of 1.5 and 0.4 respectively, depending on the measuring
position compared with the case without the metal pipe. These results were
interpreted as follows; the loop magnetic field has incident angle because of
the asymmetric configuration, so that the magnetic field intensity in the
direction normal to the aluminum pipe was decreased by induced counter magnetic
field arising from eddy current flowing in the pipe. For the iron pipe, the
generated loop field is shunted in the ferromagnetic pipe due to the asymmetric
configuration.
Key words:
ELF magnetic field, Single-phase current, Asymmetric configuration of shielding
material, Flux shunting, Eddy current
EMCJ2000-109(2000-12)
Calculation of Current in a Human Model
Induced by Low Frequency Magnetic Field (3)
Boonchai Techaumnat, Shoji Hamada and Tadasu
Takuma
Department
of Electrical Engineering, Faculty of Engineering, Kyoto University
Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Tel:
(075)753-5290, E-mail: m54932@sakura.kudpc.kyoto-u.ac.jp,
takuma@kuee.kyoto-u.ac.jp, and shamada@kuee.kyoto-u.ac.jp
Abstract The paper describes
the calculation results of induced current in human models due to magnetic
field generated from a household appliance. The calculation method is the
boundary element method. Human models with five internal organs were
constructed from the second order curved elements. The household appliance is a
hall dryer located in two different positions, which is simulated by a magnetic
dipole. In the homogeneous model, maximum current density appears at the body
surface near the magnetic dipole. In the models with internal organs, induced
current density in the brain substantially varies with the conductivity.
However, the effect of organ conductivity is very close to that in the case of
a uniform magnetic field.
Key words:
numerical calculation, boundary element method, ELF magnetic field, human
model, induced current
EMC2000-110 (2000-12)
The Experimental Study of the Calibration
for Foot Current Meters
Yuya Nakamoto, Soichi Watanabe*,
Masao Taki**, Yukio Yamanaka*, and Masaharu Takahashi***
Musashi Institute of Technology
*Communications
Research Laboratory, M.P.T
4-2-1 Nukuikitamachi, Koganei-shi, Tokyo,
184-8795, Japan
Tel.+81-42-327-6512, Fax. +81-42-327-6675,
E-mail: wata@crl.go.jp
**Tokyo Metropolitan University
***Tokyo University of Agriculture and
Technology
Abstract A novel
calibration method using two monopole antennas in an anechoic chamber was
investigated for two commercial induced current cramp experimentally. Those
current cramp were initially calibrated by using coaxial lines. The calibration
factors determined by the new method were higher than the original values. It
was also shown that the current distribution at the point where the cramps
attached could affect the accuracy of the calibration factors.
key words:
Foot current, current cramp, calibration, method of moment, and whole-body
resonant
EMCJ2000-111 (2000-12)
The Dependence of the Accuracy of the SAR
Estimation Based on Temperature Measurement on the Material and Shape of
Phantoms
Osamu Kagaya, Soichi Watanabe*, Kanako
Wake*, Hiroki Kawai**, Toru Uno, Masaharu Takahashi, Yukio Yamanaka*, and
Koichi Ito**
Tokyo University of Agriculture and
Technology
2-24-16 Nakamachi, Koganei-shi. Tokyo,
184-8588. Japan
Tel: +81-42-388-7441 Fax: +81-42-385-6729
E-mail: kagaya@crl.go.jp
*Communications Research Laboratory, M.P.T.
**Chiba University
Abstract In the dosimetric investigation for
biological studies using laboratory animals, the specific absorption rate (SAR)
is usually estimated by temperature measurement method using thermographic
cameras and solid phantoms. There are however some large error factors in this
method. Using some simple model, the dependence of the error factors (thermal
conduction and heat transfer) on the material and shape of phantoms are
therefore investigated in this study.
key words:
SAR, temperature measurement, phantom, thermal conduction, heat transfer,
dosimetry
EMCJ2000-112 (2000-12)
Examination on distributed coupled lines for
improvement of coupling
Ken Kawamata*, Yoehikuni Kamo**, Akira
Haga**, and Shigeki Minegishi**
*Department of Electrical and Electronic
Engineering, Hachinohe Institute of Technology
88-1 Ohbiraki Myo Hachinohe, 031-8501, Japan
Phone +81 l78 25 8064 Fax, +81 178 25 143O
*Faculty of Engineering, Tohoku Gakuin
University
l-13-1 Chuo, Tagajo 985-8537, Japan
Phone&Fax. +81 22 368 7497
Abstract Frequency
characteristics of coupling of distributed coupled lines were examined. The
measurement by coupled lines is suitable for high voltage and high frequency
signal. However, coupling of parallel-distributed coupled line has the
comb-shaped characteristics, which depend on the length of the coupled lines.
The coupled lines will have the high-pass filter characteristics of constant
coupling in the passband, if coupled lines are nonparallel. Then, the following
were proposed: linear nonparallel coupled lines, circular arc coupled lines,
and the coupled lines that amorphous magnetic substance was inserted between
parallel lines. As a result of the experiment, the coupling of the coupled
lines of three types had the high-pass filter characteristics which the coupling
was constant.
Key words:
distributed coupled lines, nonparallel coupled lines, circular arc coupled
lines, coupling, amorphous magnetic substance
EMCJ2000-113 (2000-12)
On Electro Magnetic Wave Radiation out of a
2 Conductor Parallel Line .
Katsuhiro Sato, Yuukou Ito, Hiroshi Echigo,
and Risaburo Sato**
Tohoku Gakuin Univ .,
1-13-1, Chuo,Tagajo, JAPAN, 985-8537
Phane:022-368-7357, E-mail
echigo@tjcc.tohoku-gakuin.ac.jp.
* EMC Research Laboratories Co., Ltd.
Abstract It is well
known that 2 conductor parallel line are basic transmission systems for RF
signal and energy. It gives the fundamental concept and knowledge on the RF
transmission and radiation phenomena which are the main issues of EMC problems.
Adding to the EM filed measurement around a 2 conductor parallel line, EM field
patterns were measured on the plan that was parallel to the lines and placed
with a certain distance from the line. To find the radiation sources, inverse
projection was applied to the measured data, so that it may be supposed that
the feeding point and the end of the line would be the radiation portions.
key words:
parallel transmission line, far field, inverse projection, radiation source
finding
EMCJ2000-114 (2000-12)
LSI's EMI Noise Analysis on Gate Level
Simulator
Kenji Shimazaki, Shouzou Hirano, Hiroyuki
Tsujikawa, Takashi Yoneda, Eiji Takahashi, and Yukihiro Fukumoto
Matsushita Electric Industrial Co., Ltd.
1 ,Kotari-yakemachi, Nagaokakyo,Kyoto
617-8520 Japan
TEL: +81-75-956-9511, Email:
simazaki@ngk.csdd.mei.co.jp
Abstract Recently,
EMI-noise problem has become very important, and EMI-noise analysis of LSI is
required to correct the source of a noise from the origin.
In this paper, an EMI-noise analysis method
with general gate-level simulator is proposed. Moreover, the EMI-noise spectrum
of this technique is compared with measurement using a test chip for
microcomputers.
By experimental results, it was shown that
our gate-level EMI-noise analysis method has sufficiently correlation with
measurement and is very fast as compared with transistor leve1.
key words: EMI
noise, LSI, semiconductor mounting, power supply current, decoupling
capacitance
EMCJ2000-115 (2000-12)
Local Decoupling Effects of Decoupling
Capacitors on a Multilayer PCB: Fast Analysis by a Closed-Form Expression
Osami Wada, Zhi Liang Wang, Yoshitaka Toyota
and Ryuji Koga
Dept. of Communication Network Engr.,
Faculty of Engineering,
Okayama University, Tsushima-naka 3-1-1,
Okayama 700-8530, Japan
Tel: 086-251-8137, Fax: 086-251-8136, E-mail:
wada@cne.okayama-u.ac.jp
Abstract Decoupling capacitors are
often utilized to mitigate ground bounce and EMI problems in a printed circuit
board (PCB). In this report, a new modeling approach to investigate the
decoupling effect is proposed, base on a closed-form expression for the
Z-matrix of the power/ground planes in a multi-layer PCB together with the
lumped circuit models of decoupling capacitors. The calculated results show
that the input impedance which determines the excitation efficiency of the
power/ground resonance is locally decreased by a decoupling capacitor closely
spaced to the excitation port. The local decoupling effect is quantitatively
presented as a function of the spacing between the excitation port and the
local decoupling capacitor.
Key words:
multilayer PCB, decoupling capacitor, local decoupling effect, power/ground
plane resonance, EMI, impedance matrix
EMCJ2000-116 (2000-12)
A Study of Painting Wave Absorber for 5GHz
Frequency Band
Tetsu Soh, Yasuhiko Asakura*, Osamu
Hashimoto*
Yokohama Rubber Co., Ltd.
2-1 Oiwake, Hiratsuka-shi, Kanagawa-ken,
254-8601 Japan.
Tel.: +81-463-35-9695 , Fax:
+81-463-35-9772, E-mail: soh-tetsu@mta.yrc.co.jp
*College of Science and Engineering, Aoyama
Gakuin University
6-16-1 Chitosedai Setagaya-ku Tokyo,157-8572
Japan.
Tel. & Fax.: +81-3-5384-ll21, E-mail:
hasimoto@ee.aoyama.ac.jp
Abstract We have already
confirmed that a millimeter-wave absorber between 50GHz and 110GHz was realized
using epoxy resin including lossy dielectric materials as titanium dioxide of
32phr and carbon particles of 1phr. In this study, the permittivity of this
material is measured at 5GHz and it is confirmed that the measured permittivity
is almost satisfied with no reflection condition. The design and fabrication of
the wave absorber are performed on the basis of the result mentioned before.
This wave absorber showed maximum absorption between 40dB and 45dB under the
thickness is 3.82mm. It was confirmed that the absorption more than 20dB are
obtained at the incident angle between 0 and 35
under TE and TM waves.
Key words: epoxy
resin, titanium dioxide, carbon particles, wave absorber, 5GHz band
EMCJ2000-117 (2000-12)
An Improvement of the Environment for DSRC
by using Circularly-Polarized Wave Absorber
H. Kurihara, Y. Hirai, K. Takizawa, and S.
Fuyama*
TDK Corporation
2-15-7 Higashiowada, Ichikawa-shi,
Chiba-ken, 272-8558, Japan
Phone: 047-378-9480
* Matsushita Communication Industrial Co.,
Ltd.
4-3-1 Tunashima, Kouhoku-ku, Yokohama,
223-8639, Japan
Phone: 045-544-3488
Abstract The environment for DSRC at
5.8GHz is improved by using circularly-polarized wave absorber to suppress the
multiple reflection caused between the roadway and the canopy The wave absorber
was designed for TE and TM wave, was measured for TE and TM wave, Circularly
wave. The absorbing level of wave absorber could be realized above 20dB at the
oblique incident angle from 0 to 45.
By using this circularly-polarized wave absorber, the power level of the except
communication zone could be realized lower than – 70.5dBm at the DSRC test
roadway.
key words:
Dedicated Short Range Communication, Electronic Toll Collection System,
Circularly-Polarized Wave, Oblique Incident Angle, Wave Absorber