EMCJ2000-27 (2000-07)
Rationalizing
Technical Issues about Globally Standardizing Free-Space Type EMC Site.
-
Proposal to deleting traditional concepts of AF and NSA in the CENELEC's draft
for 30MHz through 18GHz bands –
Shigekazu Shibuya, Haruo Ishizuka, Toshio Kinoshita*, Akinori
Kameshima, Hideya Andou**, Kazuaki Yoshimura**, Naoki Suzuki***, Yutaka
Ohno****, Naoki Kaku*****, and Juichi Kaku*****
Shibuya. Ishizuka or Kameshima Consultant office
*EMCT Study Group
**Touin Yokohama University
***Woobden Bell Consultant
****Systemtechnico
*****Pax EMC
Abstract Although rationalizing the EMI test
methods for 30MHz through 18GHz bands using the free-space test site are
expected to proceed greatly by an official acceptance of the fully anechoic
chamber by the CENELEC (European Committee for Electro-technical Standards
organized by 18 nations), they still remain inappropriate traditional concepts
such as AF (Antenna factor) and NSA (Normalized Site Attenuation). This paper
explains how the traditional concepts be unsuitable and then proposes the
introduction of the free-space deviation derived from the antenna gain and the
free space propagation loss to evaluate the site suitable for ones of the
free-space type.
key
words: EMC, CENELEC, antenna factor, NSA, free
space, free space deviation
EMCJ2000-28
(200-07)
Radio Noise Measurement in City Area at
300MHz
Hiroshi Echigo, Toshiyuki Hachiya and Risaburo
Sato*
Tohoku Gakuin University,
1-13-1 Chuo Tagajo City,Japan 985 8537
* EMC Laboratories
Abstract Authors have been studying on the radio
noise in city area in VHF band, especially at 300MHz. Using a spectrum-analyzer
and the APD measurement equipment which was newly developed by EMC Lab., the
time histories of 1 sec APD were measured. For the measurement points, 2 kinds
of area were selected, one of which was at the side of a road with heavy
traffic and the other was in our University campus where it was very quiet,
especially in the midnight through the early morning. For the data, some
comments were given. The levels for the specific time-rate are changed
according to some special distribution.
Key
words: Electromagnetic environment, Metropolitan
radio noise , APD , Time rate
EMCJ2000-29
(2000-07)
A Study on the CNR Estimation under
Man-made Noise and Multipath Fading Environments and Its Application to
Improvement of 2.4GHz Band Wireless LAN System with Sector Antenna
Shinpei Tou, Shinichi Miyamoto, and Norihiko
Morinaga
Graduate School of Engineering, Osaka University Yamadaoka
2-1, Suita, Osaka 565-0871 Japan
Tel: +81-6-6879-7738, Fax:
+81-6-6879-7602,
e-mail:
s-tou@mercury.comm.eng.osaka-u.ac.jp
Abstract
With the increase of demands for Wireless Local Area Network (WLAN)
systems, 2.4GHz band WLAN system has been taking a great attention, as it provides
the attractive features such as relative high-speed transmission, low cost, and
unnecessary of the license. However, the performance of 2.4GHz band WLAN system
is seriously degraded by man-made noise emitted from ISM apparatus and
multipath fading caused by multipath propagation of transmitted signal. Since
radio channel is varied with time under man-made noise and multipath fading
environments, it is effective to estimate channel condition for the
improvement, which adapt to time varying of the channel. In this paper, we
focus on Carrier-to-Noise Power Ratio (CNR as the most basic parameter which )
characterizes radio channel condition, and evaluate performance of CNR
estimation under man-made noise and multipath fading environments. And next, we
evaluate the improvement in Bit Error Rate performance of 2.4GHz band WLAN
system using sector antenna with CNR estimation
key
words: 2.4GHz band WLAN system man made noise,
multipath fading, CNR estimation, sector antenna
EMCJ2000-30
(2000-07)
Estimation of Electromagnetic Noise from
Digital IC in GHz Band by Using Small Size TEM Cell
Masahiro Takahashi, 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 of using small size TEM cells to evaluate
electromagnetic noise from digital ICs in the GHz band. In this evaluation
method, the device under test (DUT) is rotated in four directions and the
output voltage is measured; then, the magnetic field coupling components and
the electric field coupling components are calculated. For this evaluation
method, used small size TEM cells with the upper limit frequency extended to
3GHz, and conducted verification with a micro-strip line. As a result,
demonstrated that this evaluation method can be effectively applied at
frequencies up to 3GHz.
key words:
Digital IC, Electromagnetic noise, EMI, Measuring method Evaluation method
EMCJ2000-31
(2000-07)
Analysis of Far-end Crosstalk using Two
Paralell Microstrip Lines Considering C-V Characteristics
Akiyoshi Hirao, Fujihiko Matsumoto, and Yasuaki
Noguchi
Department of Applied Physics, National
Defense Academy,
1-10-20, Hashirimizu, Yokosuka, 239-8686,
JAPAN
E-mail :noguchiy@cc.nda.ac.jp
Abstract
The high-speed and large-capacity digital communication has been
required to date. The crosstalk noise is one of the most important problems to
be solved, which leads malfuction in data transmission equipments. In this
study, a silicon diode and a variable capacitance diodes are used as nonlinear
loads of the microstrip lines. The waveform of the far-end of crosstalk is
measured and analyzed using a 4-port network model in the time domain. It is
shown that the C-V characteristics of diode influences the waveform of the
crosstalk and that it is valid to calculate the waveform considering the
capacitance of the loads to be constant, if the dependence of the capacitance
upon the voltage is small.
key
words: Microstrip Lines, Far-end Crosstalk,
4-port network , Silicon diode, Variable diode
EMCJ2000-32
(2000-7)
Investigation of Electromagnetic
Interference in Automobile
Yasuhiro Shiraki, Shinji Tanabe, Tetsushi
Watanabe*, and Katsuya Nakamoto*
Advanced Technology R&D Center,
Mitsubishi Electric Corporation
8-1-1 Tsukaguchi-Honmachi, Amagasaki,
Hyogo 661-8661 Japan
Tel: 06-6497-7506, E-mail: shiraki@ele.crl.melco.co.jp,
tanabe@ele.crl.melco.co.jp
*Himeji Works Mitsubishi Electric
Corporation
840 chiyoda-Machi, Himeji Hyogo 670-8677
Japan
Tel: 0792-98-9877, E-mail: watanate@hime.melco.co.jp,
nakamok@hime.melco.co.jp
Abstract Electromagnetic radiation from
electronics in automobile has been analyzed numerically and experimentally. The
source of the noise is not only the noise from electric devices themselves, but
also the wire harness. The numerical method is a combination of the finite
difference time domain method (FDTD method) and the transmission line analysis.
We found that standing waves appear inside the automobile. This phenomenon was
confirmed by measurements.
key
words: FDTD method, Transmission line analysis
Electromagnetic interference, Wire harness, Electronic control unit, Standing
wave
EMCJ2000-33
(2000-07)
Impedance Analysis On Power Distribution
Lines in Multi-1ayer Printed Wiring Board
Kabayama Hideki, Fujio Shouhei, and Sakirai Akihisa
EMC Engineering, Yamato Laboratory IBM
Japan Ltd.
1623-14 Shimotsuruma, Yamato-shi,
Kanagawa 242-8502 Japan
e-mail: kabayam@jp.ibm.com
Abstract To research the relationship between a
board resonance and an effect of an additional inductance to the power lines in
a module on PWB, we constructed a real-board and made measurements of its
radiated emissions. In addition, impedance for elements of the board was
measured and is related to its emissions. As a conclusion, for a board with a
power-plane structure, the method of an additional inductance is much
influenced by the effect of a loop resonance which includes a path through a
decoupling capacitor Each impedance of elements in a board can be a
characteristic to evaluate the effect of an additional inductance.
key
words: EMI, Inductance ,Impedance, Printed
Wiring Board, Decoupling, Resonance
EMCJ2000-34
(2000-07)
LSI model to Simulate High Frequency
Current on Printed Circuit Board
Shigenori Ohtake*, Yuichi Mabuchl**, Tohru
Hayashi*, Takashi Sato*, Gohichi Yokomizo*, Shinji Shirakawa**, Hideshi
Fukumoto**, and Atsushi Nakamura*
*Semiconductor & Integrated Circuits Div.,
Hitachi Ltd..
20-1 Jousuihon-cho, 5-chome, Kodaira-shi,
Tokyo, 187-8588, Japan
Phone: +81 42 320 7300, Fax: +81 42 327
8631
**Hitachi Research Laboratory, Hitachi,
Ltd.
1-1 Omika-cho
7-chome, Hitachi-shi, Ibaraki, 319-1292, Japan
Phone: +81 294 52 5111, Fax: +81 294 52
7948, E-mail : otake-shigenori@sic.hitachi.co.jp
Abstract
A LSI macro model to simulate high frequency current on power and ground
planes of printed circuit board (PCB) for EMI estimation has been developed.
The simulated value of current on power supply line of a PCB with standard
logic circuits using developed model agrees with the simulated value using
transistor level model with average 2dB difference. And a methodology to
generate macro model parameter with measurement has been developed Simulated
value of current spectra on power supply line of a PCB using macro model whose
parameter is generated with the methodology agrees with measured value within
4dB difference.
key
words: High Frequency Current, macro model,
LSI, Simulation, Electromagnetic emission, EMI
EMCJ2000-35
(2000-07)
Parameter Identification for a Power
Current Model of LSI
Yukihiro Fukumoto*, Takuya Matsuishl**, Yoshitaka
Toyota**, Osami Wada**, and Ryuji Koga**
*Matsushita Electric Industrial Co.,
Ltd.
1006 Kadoma, Kadoma-shi, Osaka
571-8501
TEL: +81-6-6900-9224, E-mail:
fukumoto@isl.mei.co.jp
**Okayama University
3-1-1 Tsushima-naka, Okayama 700-8530
Abstract
A power terminal model, which represents high frequency current on power
terminal of IC/LSI, is necessary to perform power bus noise simulations of
digital printed circuit boards. In this report, the model, which has equivalent
internal impedance and an equivalent internal current source, is proposed. The
model can express high frequency current, which is affected by the impedance of
bypass capacitors and power bus traces on printed circuit board. Parameters in
the equivalent internal impedance are given by the impedance analyzer, and the
equivalent internal current source can be calculated by measured high frequency
current which is obtained under certain external impedance. Furthermore, it is
shown that outputs of the model give good agreement with experimental results
under various conditions of external impedance
Key
words: EMI, LSI, simulation, current source
model, internal impedance internal current source
EMCJ2000-36
(2000-07)
Reduction of Electromagnetic Radiation by
Placing Capacitors Between Adjacent Power Planes for Printed Circuit Board
Ayako Takagi and Haruhiko Okumura
Corporate Research and Development
Center, Toshiba Corporation
1 , Komukai Toshiba-cho, saiwai -ku,
Kawasaki 212-8582, Japan
TEL: +81-44-549-2254, FAX:
+81-44-520-1255 E -mail: ayako.takagi@toshiba.co.jp
Abstract
Reduction of electromagnetic radiation technique for Printed circuit
board whose power plane is divided by some voltage power sources in the same
layer is reported. By placing capacitors between adjacent power planes, high
frequency current is distributed another power plane and high frequency voltage
is suppressed at both ends of power planes. Electromagnetic radiation reduces
by 10dB at the result of test circuit board measurement. At first capacitors
must be placed at both ends of adjacent side each other to suppress another
extra resonance by linear circuit simulation
key
words
EMI, capacitors, resonance frequency, noise, S-parameter, printed
circuit board
EMCJ2000-37
(2000-07)
PCB Layout Dependence of Common-Mode
Radiation
Hideki Sasaki, Takashi Harada, and Toshihide
Kuriyama
EMC Engineering Center, Protection
Technology Laboratories, NEC Corporation
1-1, Miyazaki 4-Chome, Miyamae-ku,
Kawasaki, Kanagawa
TEL: 044-856-2071, E -mail:
h-sasaki@di.jp.nec.com
Abstract This
paper presents that radiated emissions from printed circuit boards (PCBs) vary
with depending on the PCB layout, even though the circuit structure and the
ground plane shape of the PCBs are same. Measurements of radiated emissions and
radiation patterns for two kinds of PCBs demonstrate that the variety is caused
by common-mode radiation from the excited ground plane in the PCBs.
Measurements and electromagnetic simulations based on FDTD (Finite Difference
Time Domain) method also prove that the common-mode radiation was able to be
suppressed by PCB design considering relationship between the ground plane
shape and the direction along signal traces.
key
words: Common-mode radiation, printed circuit
board, EM simulator, FDTD
EMCJ2000-38
(2000-07)
Power/Ground Plane Resonance Reduction
using High Resistance Conductor Pattern Yoshihiro
Takeshita, Satoru Taicenouchi, Shinya Terao, and Ryuji Koga*
Kyocera Corporation, R&D Center
Kagoshima
1-4 Yamashita-cho Kokubu, Kagoshima
899-4312
TEL:0995-45-5200, E-mail :
Yoshihiro_Takeshita@rdg.kyocera.co.jp
*Faculty of Engineering, Okayama
University
3-1-1, Tsushima-naka, Okayama 700-8530
TEL:086-251-8137, E-mail:
koga@cne,okayama-u.ac.jp
Abstract
We propose a printed circuit board (PCB) with a circuit of lossy
structure to reduce radiated emissions generated by digital devices. To suppress
undesirable resonance, high resistance conductor patterns are placed around
solid power/ground planes. The high-resistance conductor patterns can disperse
the high frequency electromagnetic energy The properly designed resistance
patterns conscious of impedance matching can reduce ground bounces and
resulting radiation cased by the resonance associated with the solid
power/ground planes and decoupling capacitors
key
words: EMI, PCB, Resistance, Power and Ground
Plane, Resonance Ground bounce
EMCJ2000-39
(2000-07)
Calibration of Magnetic Near-Field Probes
and Measurement of Magnetic Field Distribution Change by Conductive Plane
Placed Near the PCB
Hisashi
Takita, Motoshi Tanaka, and Hiroshi Inoue
Akita
University, Faculty of Engineering and Resource Science, Department of
Electrical and Electronic Engineering
1-1
Tegata Gakuen-machi, Akita 010-8502 Japan
Tel:
+81₯18-889-2491, Fax: +81- 18-835-4651, E
-mail: takita@venus.ee.akita-u.ac.jp
Abstract To
measure magnetic near-field distribution with high spatial resolution, four
magnetic near-field shielded loop probes which have deferent coil area are
calibrated by comparing with magnetic field strength measured by HP
closed-field probe as the standard, on a microstrip line of printed circuit
board (PCB). Then, to discuss modes of the emission and the suppression of
noise with the conductive plane shielding near the PCB, the magnetic near-field
distributions were measured using the calibrated probe. The results on the
input impedance of printed line show that the distance between a PCB and a
conductivity plane is needed 8 mm to reduce the effect of the electromagnetic
coupling. And from the measurement of magnetic filed, it was cleared that the
changing the area of the conductive plane make the change of magnetic field
strength above 300 MHz frequency range.
key
words: magnetic near-field probe, antenna
factor, printed circuit board, conductive plane magnetic field distribution
EMCJ2000-42
(2000-08)
The Current Ratio Induced by A Lightning
Surge at A Modeled Tower in A Microwave Relay Station
Chikashi Okabayashi*, Naoki Inoue*, Hironao
Sakamori**, and Hideomi Takahashi***
*SANKOSHA CORPORATION
1-12 MIYASHINO 1-CHOME,SAGAMIHARASHI
Tel:042-770-0258,042-770-0258,
e-mail:okabayashi@sankosya.co.jp, inoue-n@sankosya.co.jp
**CHUBU ELECTRIC POWER COMPANY
12-14,CHIYODA 2-CHOME,NAKAKU NAGOYASHI
Tel:052-269-1277, e-mail:sakamori
Hironao@chuden.co.jp
***UNIVERSITY OF THE RYUKYUS
1 SENBARU,NISHIHARA,OKINAWA
Tel:098-895-8684,
e-mail:takahasi@eee.u-ryukyu.ac.jp
Abstract The
long-range investigations of the lightning damage mechanism in the microwave
relay stations at the power companies were conducted in many research
organizations, and the present lightning protection methods for the stations
were based on the results of the investigations The protection measures show
several effects, however they can not be sufficient at present. In the future,
when taking the new measures, it is very important to know at what rate the
lightning current flows (down) through each part of the tower legs and
waveguides in the tower and so on In this report, we measured the time history
of the lightning current which flows through each parts of the equivalent steel
tower model manufactured, by impressing pulse voltage on the certain points of
the tower.
key
words: Microwave relay station, Transmission
tower model, Lightning surge propagation speed, Mutual induction, Lightning
surge ratio, waveguides
EMCJ2000-43
(2000-08)
Measurement of the Ground Potential Rise
around a Test Transmission Tower for Lightning Current Triggered by Rocket
Masayuki Minowa*, Jyuken Mitsutsuji*,
Hitoshi Sakurano**, and Koichi Nakamura***
*TOENEC
Corporation
1-79, Takiharu-cho, Minami-ku, Nagoya
457-0819, Japan
TEL 052-619-1746, E-mail:
minowa@fslab.toenec.co.jp
**Ishikawa National College of Technology
***Nagoya Institute of Technology
Abstract The
measurement of the ground potential rise around a building struck by lightning
is important for the suitable lightning protection plan. However, there is
quite few papers on the ground potential rise caused by lightning strike to the
building This paper presents the measurements of the ground potential rise
around a tower foot of an EHV test transmission line, with the lightning
current induced by the rocket triggered lightning. Enough data were obtained
for two triggered lightning flashes in 1998. From the analysis of the current
and the corresponding potential characteristics, the relation of potential to
the distance from the tower foot was indicated. key words: Lightning, Ground Potential, Ground
Potential Rise, Rocket Triggered Lightning, Grounding
EMCJ2000-44
(2000-08)
The Damage Due to The Lightning Discharge
and The Example of The Measure
Yasuhiro Shimojima and Kazushi Otsuki
OTOWA Electric Industrial Co., Ltd.
7-18 , MEISHlNCHO 3 - CHOME AMAGASAKI
CITY, HYOGO 661-0021 JAPAN
PHONE +81 6 6429 5059
Abstract The progress of technique of
semiconductor device makes the electrical appliances small and highly
efficient. And it makes the life comfortable and convenient But the
microcomputer or electric-circuit used in the those electrical appliances work
by very low voltage, so easily they work wrong or break by the overvoltage ,
and the serious confusion come about . In the factory, park, golf ground,
school, and so on, the lightning discharge dose great damage widely, and their
function must stop. Now I am introducing how the damage is and how we prevent
the damage caused by direct stroke or ground flash.
Key
words:
ground flash, lightning, Arrester, insulation transformer
EMCJ2000-45
(2000-08)
Characteristics of Transition Duration
and Frequency Spectra of Transient Voltage Due to Micro Gap Discharge in Air
Ken Kawamata, Shigeki Mineglshi*, and Akira Haga*,
Dept. of Electrical and Electronic
Engine., Hachinohe Inst., of Tech..,
88-1 Ohbiraki Myo Hachinohe, 031-8501
JAPAN
*Dept. of Electrical Engine., Tohoku
Gakuin Univ.,
1-13-1 Chuou Tagajo, 985-8537 JAPAN
Abstract: The transition durations due to micro
gap discharge were investigated in time domain and frequency domain. The gap
space was set very small for voltages below 1500 V as a simulation of the ESD
Measurement system consists of a distributed constant line system with a
tapered coaxial electrode which has a matched impedance for the characteristic
impedance of the distributed constant line system The insertion loss of the
tapered coaxial electrode was within -3dB in the frequency range below 4.5GHz As
a consequence of the experiment, the relationship between discharge voltage and
transition duration were confirmed. The voltage rise time was slowed down
gradually in positive polarity, while the voltage fall time was slowed down
remarkably in negative polarity for the 0.1 mm needle. The frequency spectra
were over 2.9GHz in positive polarity.
Key
word: Transition duration, Discharge, ESD,
Distributed constant system, Frequency spectra
EMCJ2000-46
(2000-8)
Two Types of Stochastic Evaluation
Methods for Electromagnetic Wave in Near Field Leaked from ITE Group under
Parallel Working Situation
----Introduction of Compound Law in Space and Time Domain
Akira
Ikuta and Mitsuo Ohta*
*Hiroshima
Prefectural Women's University
1-1-71
Ujina-Higashi, Minami-ku, Hiroshima, 734-8558 Japan
TEL:
082-251-9763, E-mail: ikuta@hirojo-u.ac.jp)
**Hiroshima
University, Emeritus
Abstract In
this study, for the compound electromagnetic wave in near field leaked from ITE
group under parallel working situation, two typical types of stochastic
evaluation methods are proposed from a bottom-up viewpoint by constructing
structurally the unified fundamental processes existing objectively in the
actual phenomena. More specifically, as a fundamental additive process for the
mechanism on spatial distribution of electromagnetic waves generated in near
field, an evaluation method based on an additive rule of cumulants among
independent fluctuations including well-known an additive property of energy is
proposed. Next, as a fundamental process in a time domain, an evaluation method
for a compound of time ratios existing in each state based on a stochastic
exclusive property is proposed by paying our attention to the specific
fluctuation form in near electromagnetic field. The effectiveness of the
proposed theory is experimentally confirmed by applying it to the observation
data leaked from VDT in the actual work environment.
key
words: Stochastic evaluation for
electromagnetic wave in near field, space and time domain stochastic compound
law
EMCJ2000-47
(2000-8)
A Stochastic Signal Processing Method for
Linear and Nonlinear Mutual Correlation Effect among Electromagnetic, Sound and
Light Waves Leaked from VDT
Yoshifumi Fujita and Mitsuo Ohta*
Department of Management and Information
Science, Onomichi Junior College,
1600 Hisayamada-Chou, Onomichi, 722-8506
Japan,
Tel: +81-848-22-8311, E-mail
:fujita@onomichi-jc.ac.jp
*Professor Emeritus of Hiroshima
University,
1 -7- 10 Matoba-Chou, Minami-Ku,
Hiroshima, 732-0824 Japan,
Tel: +81-82-262-4678, E-mail : ohta-3322
@mdd.spacetown.ne.jp
Abstract
Nowadays, owing to the widely applied electronic technology equipments,
we are always exposed to electromagnetic wave radiated from them. At the same
time, we are affected by the sound noise and light wave. In such environment,
it is necessary to find whether some accumulative and multiplicative effects
are caused by them both physically and psychologically. For this purpose,
first, it is important to know the correlation information among them as deeply
as possible However, since originally these fluctuate respectively in a
non-Gaussian distribution form, it is difficult to find this correlation by
employing the usual standard type correlation analysis in terms of artificially
established linear and/or nonlinear type regression functions. In this paper, a
new trial extracting correlation is proposed based on the conditional
probability density function form derived from a statistical type Hermite
series expansion expression of two-variate joint probability density function.
The proposed method has been confirmed by applying it to the electromagnetic,
sound and light leaked from VDT.
key
words: electromagnetic environrnental problem,
higher order correlation, statistical type Hermite series expansion
EMCJ2000-48
(2000-08)
Field Distribution and Absorbable
Condition of Thin Electromagnetic Wave Composed of Huge Dielectric Constant
Film
Toshio
Tsuno and Hidehito Hiratani
Department
of Electrical Engineering, Toyama National College of Technology 13 Hongo-machi,
Toyama-shi, Toyama-ken, 939-8630 Japan
Tel.
& Fax.: 076-493-5416, E-mail: tsuno@toyama-nct.ac.jp
Abstract @Inserting a film with huge
dielectric constant into the air layer of the Ι/4 wave absorber, we obtain a
thiner wave absorbable pane]. In this panel (resistance-film/air-2/huge
dielectric constant film/air-1/reflecting-film), the magnetic field has an
amplitude with several times larger than that of the incident wave, therefor
the electric field has steeper increase from O at the surface of the
reflecting-film, up to the amplitude of the incident wave at the resistance
film. The variation of the field is linear in space, then we approximate the
absorbable The results are (1) the condition in the first order of the
multiplication of wave number and layer thickness. (2) the absorbable
resistance of the absorbable frequency is independent to the incident angle of
the wave, resistance-film is the same as that of the l/4 absorber.
key
words: Electromagnetic wave absorber, Absorbable
condition, VHP, Devided conductive film, Transparent conductive film, Window
pane
EMCJ2000-49
(2000-08)
An Experimental Study on the Effect of
Noise Suppression Device on Radiated Interference Suppression from Printed Wire
Hidetoshi Yamamoto, Shinich Shinohara, and Risaburo
Sato
Electromagnetic Compatibility Research
Laboratories Co., Ltd.
6-6-3, Minami-yoshinari, Aobaku, Sendai,
989-3204, Japan
Phone: 022-279-3781, E-mail :
yamamoto@emc-1.co.jp
Abstract In this paper, the relation between the
suppression effect of noise suppression device on radiated interference from
printed wire and its install position was discussed. The experimental
investigation in the range of the frequency of 10 GHZ from 300 MHz was
conducted. The results show the possibility to predict the behavior of
suppression effect decreasing of noise suppression device from its install
position and its reflection coefficient.
key
words: Electromagnetic interference, Radiated
emission, Printed wire, Noise suppression device, Suppression effect
EMCJ2000-50
(2000-08)
Measuring Radiated Immunity
Characteristics of 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
TEL: 022-279-3781, E
-mail:aizawa@emc-1.co.jp
Abstract
We conducted experimental studies to verify the radiated immunity
characteristics of fiber optic modules The results of this measurement show
that the portion between the photodiode or the photodiode/amplifier module and
the back-end circuits had the lowest level of immunity to noise. We found that
this portion functions as an antenna and, therefore, it is the most
noise-susceptible. Perhaps we should shield the O/E section. Next, the results
of measurement that the radiated immunity frequency characteristics show the
noise-susceptible frequency characteristics are different by the O/E section
types.
key
words:
fiber optical modules, radiated immunity, PD module
EMCJ2000-51
(2000-08)
Relationship between Wetting Property of
Transmission Line and Audible Noise
Kiyotomi Miyajima and Kazuo Tanabe
Central Research Institute Of Electric
Power Industry
2-11-1, Iwado Kita, Komae-Shi, Tokyo
201-8511 JAPAN
Phone: +81-3-3480-2111, FAX : +81-3-3480-3642,
E-mail: miyajima@criepi.denken.or.jp
Abstract
Under rainy conditions, subconductors of transmission lines generate
audible noise due to corona discharge by waterdrops on their surfaces. In
general, the method of decreasing the corona activity is to reduce the electric
field (maximum conductor surface gradients: Gmax) using a bundle of conductors.
In this report, the conductor wetting property of waterdrops on conductors are
studied to establish a new method of decreasing corona activity. The result
from artificial rainfall tests shows that a super-water-repellent surface
conductor is the best method to decrease corona activity, because the waterdrop
does not remain on the surface.
key
words: transmission
line corona discharge, wetting property, super-water-repellent surface
EMCJ2000-52
(2000-08)
The Time-Frequency Analysis of The
Harmonics Sent Out From an Electric Power Conversion System
Keiji Akamatsu, Michihira Masakazu*, Funaki
Tsuyoshi, Kawasaki Zen-ichiro, and Kenji Matsuura
Osaka Univ.
*Kobe City C.T.
Abstract In recent years, the harmonics and EMI noise sent out from an
electric power conversion system are getting a great deal of attention in
electromagnetic environment problems. So, the considerations for mentioned
above have been getting important. Therefore, there is need to do a detail
frequency analysis such as transient phenomena at the switching. So, we have
proposed the analytic technique using Wavelet-transformer which is possible to
catch a phenomenon from the both sides of the time and the frequency. In this
paper, we performed the analysis using Wavelet-transformer against the actual
measured date at the switching interval Then, based on obtained result, we
describe the high validity of Wavelet-transformer and the application to the
power electronics field.
EMCJ2000-53
(2000-08)
New Method for Characterization of
Magnetic Field near Electrical Appliances by Simple Estimation of Equivalent
Magnetic Dipole Moment
Kenichi
Yamazaki and Tadashi Kawamoto
Central
Research Institute of Electric Power Industry
2-11-1,
Iwado-kita, Komae-shi, Tokyo 201-8511
Tel:
03-3480-2111 , E-mail: yamazaki@criepi.denken.or.jp
Abstract
A new simple method to characterize magnetic field distribution around
electric appliances was proposed. The method consists of estimation of the
magnetic dipole moment vector, which is equivalent to an electric appliance. In
the proposed method, the dipole moment vector was assumed to be a scalar value
by allowing 6dB uncertainty in the estimated magnetic field, which allows us to
easily estimate the position and amplitude of the magnetic dipole moment. The
validity of the method was verified by experiments using three types of
appliances. In addition, frequency characteristics of the magnetic field were
taken into account by considering harmonics components in the magnetic field
waveform. We used the proposed method for several types of electric appliances,
and estimated their equivalent magnetic dipole moments and harmonics
components. The results showed that the proposed method had several advantages
compared with other methods, the main one being its simplicity. The conditions
required for adoption of the method were also clarified. The method is adequate
to quantify the magnetic field distribution around electric appliances.
key
words: ELF Magnetic Field, Electric Appliance,
Magnetic Dipole Moment
EMCJ2000-54
(2000-08)
Calculation of Current in a Human Model
Induced by Low Frequency Magnetic Field (2)
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 a 50-Hz uniform magnetic field. The human models with five internal organs
were constructed from the second order curved elements. The calculation method
is the boundary element method. In the homogeneous model, the maximum current
density appears near the body surface at the front and back for a horizontal
magnetic field and appears at the left and right side of the body for a
vertical one. Little effect was found on the induced current of each internal
organ for two different posture. We have shown that ratio of the induced
current density in an organ to the conductivity of its surrounding varies
proportionally to the ratio of the conductivities in many cases.
Key
words: numerical calculation, boundary element
method, ELF magnetic field, human model, induced current
EMCJ2000-55
(2000-08)
Historical Overview of the Problem of the
Effect of Electromagnetic Field (EMF) and Experimental Studies
Kitamura Satoshi
Tokyo Electric Power Co. Power
Engjneering R&D Center, Transmission & Substation Group
4-1, Egasaki-Cho, Tsurumi-ku, Yokohama,
230-8510 JAPAN
Phone 045-613-3221, E-mail:
t0392985@pmail.tepco.co.jp
Abstract
In 1989, Tokyo Electric Power Co. (TEPCO) started a life-span EMF
exposure experiment m rats, the earliest large-scale one in the world, in order
to test the relationship between 50Hz magnetic fields and cancer Since then
TEPCO has conducted various kinds of experiments using fruit flies, mice and so
on. In this paper, historical overview of the problem of the effect of EMF and
experimental studies are reported
Key
words: EMF, 50 Hz magnetic field,
Carcinogenicity test
EMCJ2000-56
(2000-09)
Making Free Space and Enhancement of
Existing EMC Test Site with a Metallic Floor
-Improvement of
30MHz to 40GHz free-space type test site
- keeping pace
with worldwide standardization -
Shigekazu Shibuya, Haruo Ishizuka, Toshio
Kinoshita*, Akinori Kameshima, Takashi Suzuki**, Kouichi Yamaguchi, Kunio
Takamura, Yutaka Ohno***, and Naoki Kaku****
Shibuya Ishizuka, or Kameshima Consultant
office
*EMCT
study Group
**Net
Alpha
***Systemtechnico
****Pax
EMC
Abstract
Ful1 scale introduction by the CENELEC and CISPR of the free-space
environment into the EMI test method over 30MHz through 40GHz band will be
expected in the near future. As a result, a very large improvement in the test
accuracy and operating efficiency may be realized, whereas existing test sites
with the metallic floor (the open test sites and semi-anechoic chambers may
amount to l200 or more in number.) may become useless naturally. To cope with
this worldwide trend, new provision of the free-space type test sites together
with improvement of the existing but would-be idle test sites through making
them to the free-space type will be very important.
As
a commercially and technically viable method to realize the free-space
environment and yet high performances, utilization of a broadband and
anti-reflection fence called U-fence is suggested. Key words:
EMC, metallic floor, indefinite scale, freespace, U-fence, U-site
EMCJ2000-57
(2000-09)
A New Method of EMI Analysis With Models
of LSI at Power Supply Terminals
Masashi OGAWA, Hiroshi WABUKA, and Hirokazu TOHYA
EMC Engineering Center, Production
Technology Laboratories, NEC Corporation
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@As models of LSI at power
supply to simulate for EMI, we proposed a model on time domain composed
variable-resistor and capacitors, and a method of generating the model from
whole net list of LSI. In this report, we propose a new method of EMI analysis
on frequency domain to reduce calculation time using the former model on time
domain, and the simulated values of current spectra in the power supply line of
a PCB using the proposed method agreed well with the measured values.
Key
words: LSI model at power supply terminals,
simulation, AC analysis
EMCJ2000-58
(2000-09)
Evaluation of Spatial Resolution Using 4
Line TEG by Measuring Near-Field Electro-Magnetic Radiation
Ken Nakano and Atsushi Nakamura
Association of Super-Advanced Electronics
Technologies (ASET)
Room C-B-4, Tsukuba Center Inc., 1-6,
Sengen 2-chome, Tsukuba, Ibaraki 305-0047, Japan
Phone: +81-298-60-2402, E-mail:
nakano@si3d-aset-unet.ocn.ne.jp
Abstract
@In
order to evaluate the spatial resolution by measuring near-field
electro-magnetic radiation, the radiated emission of the test pattern with 4
signal lines on a PCB was measured. It was necessary to evaluate correlation
between radiated components and line patterns. If the lines and spaces were
broader than the spatial resolution of a magnetic probe, 4 peaks of the
horizontal component of the magnetic field could be obtained. This result was
confirmed by calculating from Biot-Savartfs law. Fine evaluation of spatial
resolution was obtained by measuring the radiated emission of the test pattern
with 4 signal lines.
key
words: EMI, Line Pattern, Electro-Magnetic
Measurement, Resolution, Magnetic Probe, PCB
EMCJ2000-59
(2000-09)
High Performance EMI Evaluation System
Akira Bandoh, Tokihiro Abe**, Toshiyuki Yaguchi*,
and Yoshihisa Hayashi*
Quality Assurance Department, TDK
Corporation
2-15-7 Higashi-Owada, Ichikawa-shi, Chiba
272-8558 Japan
*Radio-Engineering Department, TDK
Corporation
2-15-7 Higashi -Owada, Ichikawa-shi,
Chiba 272-8558 Japan
** Now with Radio Engineering Department
Abstract
As a method to achieve highly efficient EMI measurement, a high speed
and high accuracy turn-table is devised. Several points to be solved inevitably
outbreak in a high speed turn-table has been investigated, and accuracy of
measured data on continuous and non-continuous emitted noise are evaluated. As
a result, deviation of measured data at 15 rpm from conventional 1rpm has been
found to be less than 0.4dB. A chart showing an optimum turn-table rotating
seed to attain definite measurement accuracy is presented with a dominant
parameter OFF-Time of emitted noise.
key
words: EMI turn-table rotating-speed
measurement accuracy
EMCJ2000-60
(2000-09)
Analysis on A Common Mode Filter Using
S-Parameters
Fujishiro Yoshikazu
TDK Corporation Electronic Components
Business Group
2-15-7 Higashioowada lchikawa-shi
Chiba-ken, 272-8558, Japan
Telephone: 81-47-378-9663, E-mail :
fujishi@mbl.tdk.co.jp
Abstract The characteristics of a common mode
filter can be described by using mode-transformed S-parameters. This paper
shows the mode conversion of Scd parameter between common mode and differential
mode as a function of frequency and asymmetry. The difference between
balance/unbalance S-parameters and mode-transformed S-parameters are made clear
and the relation between them are derived.
key
words: S-parameter Mode transformation,
Symmetry, Common mode, Unbalance
EMCJ2000-61
(2000-09)
Temperature Distribution Analysis of
Heated Material Put In Microwave Oven by Using FDTD-HTE Method
Shinya Watanabe, Osamu Hashimoto, Minoru Makida*
Dept. of Electronics and Electrical
Engineering, Aoyama Gakuin University
6-16-1 Setagaya-ku Chitosedai Tokyo,157-8572
Japan
Phone & Fax : 03-5384-1121, E-mail:
shinnya@ee.aoyama.ac.jp and hasimoto@ee.aoyama.ac.jp
**Appliance Systems Product Development
Lab., Sharp Corp.
Abstract
In this research, the temperature distribution on the surface of a
heated material put in a microwave oven is calculated using the finite
difference time domain (FDTD) method on the basis of the heat conduction
equation (HTE) As a result, the calculated result coincides excellently with
the measured result, where we confirmed that the temperature distribution of
the upper area of the heated material was high, and there are three areas with
high temperature distribution Consequently, We were able to confirm the
effectiveness of the FDTD-HTE method to the calculation of the temperature distribution
of the heated material in the microwave oven.
Key
words: Uneven Heating, Microwave Oven, Method
of FDTD-HTE, Heat Transport Equation
EMCJ2000-62
(2000-09)
A Quarter-Wavelength Wave Absorber using
An FSS For Two Frequencies of X and Ku Bands
Akihiko Itou, Osamu Hashimoto*, Masahiro Hanazawa*,
Hidemi Nakajima, and Tetsuya Takahashi
Technical Research Institute, TOPPAN
PRINTlNG CO.,LTD.,
4-2-3 Takanodai-minami, Sugito-mati,
Kita-katushika-gun, Saitama 345-8508, JAPAN
Phone: +81-480-33-9138, Fax.:
+81-480-33-9022, E-mail: akihiko.ito@toppan.co.jp
*College of Science and Engineering,
Aoyama Gakuin University
6-16-1 Chitosedai, Setagaya-ku, Tokyo
157-8572, JAPAN
Phone & Fax.: +81-3-5384-1121
Abstract
Two types of resistive-type wave absorbers are fabricated using a
frequency selective surface (FSS) for two frequencies of X and Ku bands. One
partly consists of the absorbing films with two layers, whereas the other one
is made by two layer FSS films. As a result, good shield and absorption of
proposed wave absorbers are obtained in X and Ku bands. It is possible to
realize the wave absorber with two layer absorption films. In this case, the
absorption film is assumed to be a metal plate for the wave absorber. On the
other hand, we also confirm that the wave absorbers with two layer reflection
films are simply realized by the basic design method of the single layer
absorber without the use of the point matching method, because the thickness
between FSS and absorption film can easily be determined by the classical
absorber design
key
words: Wave absorber, Two frequencies, FSS,
Resistive-film, X-band, Ku-band, Frequency selectivity
EMCJ2000-63
(200-09)
Effect of Resistive Sheet in Reducing
Electromagnetic Interference Level Induced in a Pacemaker for Portable
Information Terminals
Takeshi
OHSHIMA, Jianqing WANG, and Osamu FUJIWARA
Faculty
of Engineering, Nagoya Institute of Technology
Gokiso-cho,
Showa-ku, Nagoya 466-8555, Japan.
Abstract
A shielding technique is an effective means to protect implanted cardiac
pacemaker users from portable information terminals, whereas no evolution
methods have been available for this aim. We previously proposed a FDTD model
for predicting EMI (electromagnetic interference) levels in the pacemakers, and
showed that the open-voltage induced in the pacemaker connector can be used as
an appropriate index for determining the EMI level. With this model we
evaluated to what extent the EMI level in the pacemakers for half-wavelength
dipole antennas can be reduced by magnetic / resistive shielding sheet. As a
result, we have found that when the antenna is placed at a distance of 1 cm
from the torso surface, the magnetic sheet gives the identical EMI level at an
antenna distance of 6 cm, while the resistive sheet gives the same reduction
effect as the case for the antenna placed over a 20 cm distance from the torso.
This latter finding shows that even if the distance between the antenna and the
torso is as close as I cm, the resistive sheet enables one to secure the effective
distance longer than 22 cm being specified in the guideline of the Pacemaker
Committee of Japan.
key
words: portable information terminal, implanted
pacemaker, electromagnetic interference, resistive sheet, FDTD analysis
EMCJ2000-64
(2000-09)
The Study about The Multi-Drop
Transmission using The Balanced Cable
Masahiro Maki*, Satoshi Shinozaki**, Seiji
Hamada***, Masamitsu Tokuda***, Yoshifumi Shimoshio****, and Hiroaki Koga****
*Matsushita Electric Industrial Co., Ltd.
Kyushu Multimedia Systems Research Laboratory
693-47,kawatsu, Iizuka, Fukuoka-ken
820-0067, Japan
TEL: +81-948-21-2613, E-mail :
maki@qrl.mei.co.jp
**Matsushita Communication Industrial
Co., Ltd.
***Graduate School of Kyushu Institute of
Technology
****Dept. of Information and
Communication Eng. Kumamoto National College of Tech.
Abstract In
recent years, the growth of networks progresses quickly, in the multi-drops
communication system that used the balanced cable currently used with the
telephone network etc., realization of the Wide-Band transmission came to be
desired from the former In this report, in order to realize such the Wide-Band
transmission, the transmission model used as the worst attenuation and the
worst group delay in the multi-drops communication system was specified, and
transmission-characteristic analysis by the simulation was performed From the
analysis result, making showed obtaining the transmission characteristic of the
Wide-Band Frequency the branch line way length in the multi-drops communication
system.
key
words: Balanced Cable Multi-drop transmission Wide-Band transmission
EMCJ2000-65, MW2000-109 (2000-10)
RF
Responses of Non-Linear Devices to Induce the Faulty Operation of Electronic
Apparatus for Electromagnetic Waves
Shigeaki
Takahashi
National
Institute of Technology and Evaluation
2-49-10,Nishihara,
Shibuya Ward, Tokyo 151-0066, Japan.
Phone:
03-3481-1921, E-mail takahashi-shigeaki@miti.go.jp
Abstract It has been reported that
radio-frequency (RF) electromagnetic waves can cause the faulty operation of
electronic apparatus. We investigated the cause of the faulty operation of an
electric wheelchair, and concluded that RF electromagnetic waves induced
abnormal responses of the operational (OP) amplifiers and diodes being used in the
control circuit, which made the DC output voltages change, leading to the
faulty operation. In this paper, we examined experimentally the responses to RF
electromagnetic waves of non-linear devices commonly used in the control unit
of electric wheelchairs. We observed the output waveforms of the diode and OP
amplifier for RF sinusoidal signals with respect to the frequency and
amplitude. The RF responses of transistors constructing the OP amplifier were
also examined in order to investigate the change cause of the output voltage of
the OP amplifier. As a result, we found that the change of the DC output
voltages due to RF electromagnetic waves is caused by the rectification and
smoothing effects of non-linear devices.
key words: Electromagnetic wave, electric
wheelchair, faulty operation, non-linear device, RF response
EMCJ2000-66,
MW2000-110 (2000-10)
Calculation for The Lightning Surge
Current Distribution in Reinforced Concrete Building Caused by Direct Strikes
Jun Kato, Hidehiro Kawano, Tetsuya Tominaga, and
Shoichi Kuramoto
NTT Lifestyle and Environmental
Technology Laboratories
Tel: 0422-59-3428, Fax: 0422-59-3314,
E-mail: kato.j@lab.ntt.co.jp
Abstract @ Lightning surges appear in
the telecommunication cables, power lines, and grounding lines when the direct
lightning is stroke telecommunication center building. These might be a cause
of trouble for telecommunications equipment. We should study the current
distribution in the building due to the direct stroke, and observe the
lightning surge current distribution in order to improve the immunity of
telecommunication system In this report, the beams and pillars in building were
assumed by the equivalent radius column conductors, which have same surface
area of the complex reinforced concrete beams and pillars. The building
structure was modeled lattice structure with the column conductors. The
lightning surge current at the beams and pillars were calculated with this
model, and the results are compared with the observed results. The deviation
between calculated and observed value is around 200%. Further study to reduce
calculation error is needed to develop the effective model for analysis
Key
words: Direct lightning, Lightning surge
current, Building, Current distribution
EMCJ2000-67,
MW2000-111 (2000-10)
Magnetic Near Fields of Coupled Printed
Pattern Type Filter
Weikun Liu, Sayaka Nishikado, and Yoshio Kami
The University of Electro-Communications
Chofu-shi, Tokyo 182-8585, Japan
TEL: 0424-43-5241, FAX: 0424-89-3780,
liu@ice.uec.ac.jp
Abstract Magnetic near fields of coupled
printed-circuit trace type filter are studied. When two transmission lines such
as microstrip lines are set in the neighborhood, a coupling or crosstalk fields
may be generated between them. The fields can be obtained by estimating vector
potentials of currents on the line section and the terminals in terms of a
terminal voltage and current of the line concerned. The performance
characteristics and the fields are measured and calculated for the filter with
open and short terminal conditions, respectively. The pass and stop bands are
discussed for the distributed fields of the filters with different frequencies
and terminal conditions.
key words: coupling, transmission line, filter, magnetic near field.
EMCJ2000-68,
MW2000-112 (2000-10)
On EM Field around a 2 Conductor Parallel
Line.
Yuukou Ito, Katsuhiro Sato, Hiroshi Echigo And
Risaburo Sato*
Faculty of Engineering
1-13-1, Chuo, Tagajo, JAPAN, 985-8537
Phone: 022-368-7357/E-mail
echigo@tjcc.tohoku-gakuin.ac.jp
*EMC Laboratories
Abstract It is well known that 2 conductor parallel lines 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. We tried to measure the EM filed around the
lines to visualize the fields. It may help to understand the phenomena more
intuitively and therefore to solve the EMI and EMS problems and to develop new
techniques for EMC.
Key
word: parallel transmission line, near field,
field visualization
EMCJ2000-69,
MW2000-113 (2000-10)
A Study on Improvement of Electromagnetic
Environment in Package at 76GHz Band, using Wave Absorber.
Tetsu Soh, Yasuhisa Yamamoto*, and Osamu
Hashimotot**