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 λ/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-Savart’s 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**
Engineering, Aerospace division, The
Yokohama Rubber Co., Ltd.
*Engineering, Headquarters, Uniden
Corporation.
**College of Science and Engineering,
Aoyama Gakuin Univ.
6-16-1 , Chitosedai , Setagaya-ku ,
158-572 Tokyo , Japan
TEL: +81-3-03-5384-1121 ,FAX:
+81-3-03-5384-1121, E-mail: hasimoto@ee.aoyama.ac.jp
Abstract It is pointed out that source of noise influence
on electronic parts by the electromagnetic coupling and the resonance
phenomenon in the package, because an integrated circuit in the package can be
a source of noise. It will be considered that the wave absorber is attached in
the package for the noise countermeasure To the authors knowledge, however,
there are few studies on the effect of absorption under the conventional wave
absorber is attached in the package. Because inside of package is considered to
be near fields. In this study, the absorption effect was measured in the model
for 76GHz band, on condition that the wave absorber was attached in the
package. The measured result was compared with the calculated result by FDTD
method. As a result, it is confirmed that the good performances are obtained by
the attachment of wave absorber in the package, on condition that the thickness
of wave absorber is more than 30% conventional one.
Key
words: wave absorber, FDTD method
millimeter-wave, near fields
EMCJ2000-70,
MW2000-114 (2000-10)
Study of Complex Specific Inductive
Capacity of Carbon Black Dispersive Rubber Material at X Band.
Hiroki Kobayashl, Shinan Wang, Fumro Aida, Keisuke
Kagiwda, and Osamu Hashimoto
Showa Electric Wire & Cable
Co.,Ltd.
No. 1 -1, Minami-Hashimoto 4-Chome,
Sagamihara. Kanagawa 229-1133 JAPAN
TEL: +81-42-773-2477, E-Mail :
k870171@sntl.swcc.co.jp
*Aoyama Gakuin University6-16-1
Chitosedai, Setagaya-ku Tokyo 157-8572, JAPAN
TEL:+81-3-5384-1121, E-Mail : hasimoto@ee.aoyama.ac.jp
Abstract Dielectric loss material is one of
the main streams for electromagnetic wave absorber (EMA) at GHz range. It is
well known that carbon black dispersive rubber material is better adapted to
EMA in this wave range. But few recipes were reported, especially choices of
carbon blacks. In this paper, we study the correlation of structure of carbon
black, complex specific inductive capacity and volume resistivity. Carbon black
with low-structure is better in order to make thin EMA, but it has to fill
extremely high content.
Key
words:
electromagnetic wave absorber, carbon black, structure, volume
resistivity
EMCJ2000-71,
MW2000-115 (2000-10)
Suppression Effect of Emission from
Printed Circuit Board with Finite Ground Plane Using Ferrite Sheets
Teruo Tobana, Qiang Chen*, Kunio Sawaya*, Takayuki Sasamori, and
Kohshi Abe
Faculty of System Science and
Technology,
Akita Prefectural Univ., Honjou,
015-0055, Japan
phone : 0184-27-2226 E-mail :
tobana@akita-up.ac.jp
*School of Engineering, Tohoku Univ.,
Aoba-ku, Sendai, 980-8579, Japan
Abstract Radiated emission from a printed circuit board (PCB)
is a serious problem in a field of EMC/EMI. In order to suppress the radiated
emission from a PCB, some types of magnetic absorbers, such as a ferrite sheet
are used. To investigate the appropriate use of ferrite sheets, we analyze the
suppression effect of ferrite sheets that are placed nearby a PCB with a finite
ground plane and a microstrip line. Frequency dependent finite different time
domain (FD-FDTD) method is applied as an analysis method. The calculated
results show that the characteristic of the emission depends on the size of the
ground plane and large suppression effect is achieved by using a ferrite sheet
larger than the ground plane or a ferrite sheet placed on the side of ground
plane.
key
words: PCB, Ferrite, FD-FDTD, EMI, Emission
EMCJ2000-72,
MW2000-116 (2000-10)
Relation to The Effect of Suppress
between Conducted and Radiated-Electromagnetic Noise by Installing
Magnetic-Polymer-Composite Sheeting on Transmission Line
Fumishiro Tsuda, Shinichi Shinohara, and Risaburo
Sato
Electromagnetic Compatibility Research
Laboratories Co., Ltd.
6-6-3, Minamiyoshinari Aoba-ku, Sendai,
989-3204
TEL: +81-22-279-3781, FAX:
+81-22-279-3640, E-mail: tsuda@emc-l.co.jp
Abstract Recently, MPC-Sheeting is used for
the suppress to the electromagnetic noise generated by electronic equipment. In
this report, the relations to the effect of suppress between a conducted and
radiated-electromagnetic noise was examined on the same installation condition.
The experiment result and the effect of suppress were analyzed b),' using the
transmission line circuit. As for the effect of suppress, on a conducted-
electromagnetic noise, the factor of the loss is large. However, the relation
to the radiated-electromagnetic noise is a little.
key words: Electromagnetic noise,
Transmission line, Magnetics,
Magnetic-polymer-composite sheeting
EMCJ2000-73,
MW2000-117 (2000-10)
Fundamental Design and Characteristics of
Local SAR Estimation System Using Fixed E-field Probe
Takahiro Iyama, Yoshiaki Tarusawa, and Toshio
Nojima
NTT DoCoMo, Inc.
3-5 Hikari-no-oka, Yokosuka-shi,
Kanagawa, 239-8536, Japan
Tel.: (0468)40-3500, E-mail:
iyama@mlab.yrp.nttdocomo.co.jp
Abstract A local SAR estimation method that uses a solid
phantom and E-field probe is proposed. The method allows local SAR to be
measured using a simple setup and procedures. This paper examines the effects
of the hole in the solid phantom for E-field probe insertion and inaccuracy in
setting the complex permittivity of the solid phantom on antenna input
impedance and local SAR. The PDTD method is used to show that antenna Input
Impedance and local SAR are unaffected by the hole in the solid phantom for
E-field probe insertion. However, antenna Input impedance strongly depends on
the complex permittivity of the solid phantom and if local SAR is to be
measured accurately, ±30%, the complex permittivity should lie in the range –20% £ Der’ £+50% and –50% £ Ds £+60%. Experiments using 2
solid phantoms with different complex permittivities confirm the usefulness of
the proposed method.
key
words: SAR (Specific Absorption Rate), solid
phantom, antenna input impedance, PDTD method
EMCJ2000-74,
MW2000-118 (2000-10)
Multi-grid FDTD Analysis of
Electromagnetic Absorption in the Human Head for 5GHz Band Portable Terminals
Jianqing Wang, Hideaki Seko, Osamu Fujiwara, and
Toshio Nojima*
Faculty of Engineering, Nagoya Institute
of Technology
Gokiso-cho, Showa-ku, Nagoya 466-8555,
Japan
* NTT Mobile Communication Network Inc.,
Yokosuka 239-8536, Japan
Abstract A multi-grid finite-difference time-domain
(FDTD) method was applied for numerical dosimetry analysis in the human head
for 5GHz band portable terminals. By applying fine FDTD grids to the volumes in
the human head where the highest electromagnetic absorption occurs and coarse
grids to the remaining volumes of the head, the spatial peak specific
absorption rate (SAR) assessment was achieved with a less computation memory
and time. The accuracy of applying the multi-grid FDTD method to the spatial
peak SAR assessment was checked in comparison with the results obtained from
the usual uniform-grid method, and then the spatial peak SARS for three typical
situations of a person using a 5.2GHz band portable terminal were calculated in
conjunction with an anatomically based human head model.
key words: Multi-grid FDTD, EM absorption, portable terminal, anatomically realistic head model
EMCJ2000-75,
MW2000-119 (2000-10)
A Study on Absorbing Boundary Condition
on FDTD Method
- On the Possibility of Electromagnetic
Near-Field Calculation at Low Frequency -
Syusaku Sone, Takashi Kasuga, Motoshi Tanaka, and
Hiroshi Inoue
Akita University, Faculty of Engineering
and Resource Science,
l-1 Tegata Gakuen-machi, Akita 010-8502,
Japan
Tel: +8l-18-889-2492, Fax:
+81-18-835-465l, E-mail: sone@venus.ee.akita-u.ac.jp
Abstract To estimate the possibility of low frequency
electromagnetic near-field calculation by FDTD method, the influences of the
distance from radiation model to absorbing boundary are discussed, by the
comparison of theoretical and simulated electrical field for the half wave
dipole antenna put in the smaller analytical space than the wavelength.
Comparison of the electric near-field strength calculated by FDTD and the
theoretical value for PMLS and Mur’s ABCs, and influence of the number of
calculation step (i.e. long time calculation) are discussed. In the case of
PML, it was confirmed that the calculated electric field strength has constant
when the distance between the radiation source and the absorbing boundary is in
the near-field, even at 0.07λ. For Mur’s, the error is increased as
nearing the desistance to less than λ /2. PML can be used when the
distance from the analysis model to the absorbing boundary is less than λ /2. It is also resulted that
there is almost no effect on the long time calculation, because the results up
to 800,000 time step calculation with PML’s and Mur’s ABCs are both consistent.
key
words:
FDTD, absorbing boundary condition, electromagnetic near-field, long
time calculation, PML
EMCJ2000-76,
MW2000-120 (2000-10)
1/ｆ Noise Measurement of HF Band
SIT
Keiichi Itoh and Hiroshi Inoue*
Department of Electrical Engineering,
Akita National College of Technology
1-1 Bunkyou-cho, Iijima, Akita, O11-8511
Japan.
Tel:018 (847) 6045,
E-mail:itok@ipc.akita-nct.ac.jp
*Department of Electrical and Electronic
Engineering, Faculty of Engineering and Resource Science, Akita University
1-1 Tegatagakuenmachi, Akita, 010-8502
Japan
Tel:018 (889) 2491, E-mail:
inoueh@ipc.akita-u.ac.jp
Abstract: In this report, the noise property is measured on HF
band SIT (Static Induction Transistor) in the frequency range of 10 Hz to 10MHz
, and the bias dependency on the 1/f noise is examined. As a result, both dram
current and gate bias dependencies are observed. In particular, when the
channel of SIT is not depleted completely, it is supposed that the 1/f noise is
strongly affected by the gate bias. When the channel is pinched off, the
magnitude of 1/f noise A at 1Hz is related to the drain current ID ,
which A is proportional to ID 0.10. It is considered that
the current dependency of the 1/f' noise is weak, comparing to another kind of
semiconductor devices.
key
words:
SIT, 1/f noise, Drain current dependency, Gate bias dependency
EMCJ2000-77,
MW2000-121 (2000-10)
Evaluation of Image Contrast in Scanning
Near-field Millimeter-wave Microscope with a Slit-type probe
Tetze Hamano, Shuji Nuimura, Fumio Watanabe, Tatsuo
Nozokido, Jongsuck Bae, and Koji Mizuno
Research Institute of Electrical
Communication, Tohoku University
2-1-1 Katahira. Aoba-ku, Sendai 980-8577,
JAPAN
Phone: +81 -22-217-5514, Email:
tetze@riec.tohoku.ac.jp
Abstract Scanning near-field microscopy in the millimeter
wave region is applicable to non-destructive test of a material, in high
spatial resolution much smaller than the wavelength. In our scanning near-field
microscope system, the reflection coefficients of object provide its image
contrast. Consequently, the material constant of object, which actively
determines the reflection coefficients, such as relative dielectric constant,
can be evaluated from the image contrast quantity. The following two points for
the quantification evaluation are presented in this paper: 1) the improvement
of the microscopy system in order to reduce the remarkable “noise” caused by
any planar objects, and 2) the development of equivalent circuit of our
microscope system having a slit-type probe. Applying a hemisphere-shaped or a
higher tan6 material base under an object reduced the fluctuation of the
measured data from more than 10% down to less than 5%, and the calculation data
by the developed equivalent circuit was comparable to the measurement ones.
Key
word: millimeter waves, scanning near-field
microscope, slit-type probe, surface wave propagation
EMCJ2000-78,
MW2000-122 (2000-10)
Spectrum Management of Pulse Transmission
Line Using an Absorptive High-Cut Filter
- A
proposal to operate a 200 MHz clock bus -
Taro Miura and Shiro Nakagawa*
TDK Techno Corp.
2-15-7 Higashi-Owada, Ichikawa, Chiba,
Japan 272-8558
Tel: 047-378-9185 E-mail:
taro_miura@mbl.tdk.co.jp
*TDK Corp.
Abstract A compact absorptive
high-cut filter having small reflection has been fabricated by a helical
transmission line embedded in a lossy magnetic material. Experiments have shown
that the clock speed of a computer bus was accelerated by installation of the
filter. The theoretical considerations on this clock time improvement has given
an idea of the spectrum management that means the control of the spectrum
distribution in the signal line to establish the optimum operation. The spectrum
management will make it possible to take more effective EMI countermeasures for
the general RF equipment as well as the pulse circuit.
key
words: Absorptive high-cut filter. Magnetic
substrate, Computer bus, Spectrum management
MCJ2000-79,
MW2000-123 (2000-10)
Characteristics of Circular Loop Antenna
with Parasitic Elements
Kenji Kubota, Kenji Yokosawa*, Hiroaki Kurita, and
Risaburo Sato**
Faculty of Engineering, Iwate University,
4-3-5 Ueda., Morioka, 020-8551 Japan.
Phone/Facsimile: 019-621-6385, E-mail:
kubota@dragon.elc.iwate-u.ac.jp
*Matsushita Communication Sendai R&D
Laboratories Co., Ltd.,
2-5 Akedori, Izumi-ku, Sendai, 981-3206
Japan.
Phone: 022-377-9601, Facsimile:
022-377-9608
**Electromagnetic Compatibility Research
Laboratories Co., Ltd.,
6-6-3 Minamiyoshinari, Aoba-ku, Sendai,
989-3204 Japan.
Phone: 022-279-3781, Facsimile:
022-279-3640
Abstract The circular loop antenna with the circumference of
one in wavelength radiates the maximum power to the direction of a loop axis. A
concentric loop antenna with the parasitic loop element with the circumference
of about four in wavelength makes increase the directive gain. In this paper,
it is discussed on the characteristics of a concentric antenna with a parasitic
loop and a circular loop antenna with two parasitic linear conductors. The
experimental values agree well with the calculated results.
key
words:
1oop antenna, array, circular parasite, linear parasite, directive gain,
pattern
EMCJ2000-80,
MW2000-124 (2000-10)
A Study of Input Impedance of Half
Wavelength Rectangular Patch Antenna
Toru Ogasawara, Kenji Kubota, Yasusada Shimizu*,
and Risaburo Sato**
Faculty of Engineering, Iwate
University,4-3-5 Ueda, Morioka, 020-8551 JAPAN
Phone/Facsimile : 019-621-6385, E-mail :
kubota@dragon.elc.iwate'u.ac.jp
*Nippon Television City
Corporation,MinamiYoshinari,
6-6-3 MinamiYoshinari, Aobaku,
Sendai, 989-3204 JAPAN
Phone : 03-3433-5111,
Facsimile : 03-3431-2552
**Electromagnetic Compatibility
Research.Lab.Co.,Ltd.,
4-2-8 Shibakouen, Minatoku, 105-0011 JAPAN
Phone : 022-279-3787, Facsimile : 022-279-3640
Abstract Generally, an omnidirectional transmitting antenna for
TV broadcasting is actualized by means of' a circular array consisted of some
antenna units around a tower. The distance from the face of tower to the tip of
the antenna unit is desired as short as possible from the viewpoint of scenery,
the mechanical strength of' the tower, maintenance, and so on.
In this paper, it is discussed on the
capability of the application of patch antenna, which is matching low profile,
for a unit of a TV transmitting antenna from the viewpoint of' impedance
matching with the coaxial feeder
key
words: antenna, patch, impedance matching, TV
broadcasting
EMCJ2000-81,
MW2000-125 (2000-10)
Consideration on Modeling of the
Operation Frequency of an InP HEMT/MMIC Oscillator 11luminated by a 1 .5 μm Laser
Jun Kobayashi, Tatsuo Kuwayama, Shigeo Kawasaki,
Hiroyuki Furuta*, and Toshihiro Nomoto*
Tokai University Department of
Communication Engineering
1117 Kita-kaname, Hiratsuka, Kanagawa
259- 1292 Japan
Tel: +81-463-58-1211, Fax:
+81-463-58-8320, E-mail : kawasaki@keyaki.cc.u-tokai.ac.jp
*NHK Science and Technical Research
Laboratories
1-l0-11
Kinuta, Setagaya-ku, Tokyo157-8510, Japan
TEL:03-5494-2294/FAX:03-5494-2296
Abstract In this report, experimental data and their
investigation by a simulator of an oscillation frequency shift in MMIC
oscillator illuminated by a 1.5μm laser were described. Illumination with
the small gate-source bias, the operating frequency was shifted higher compared
to the self-oscillating one. Using a microwave circuit simulator, computed
operating frequencies with tuning the capacitance value in the FET equivalent
circuit model were observed using the harmonic balance analysis.
key words: InP HEMT, Illuminated MMIC Oscillator, 1.5μm Laser, Harmonic Balance Analysis
EMCJ2000-82,
MW2000-126 (2000-10)
A Study on Improvement of Out-of-Band
Characteristics of λ/4
Resonator Bandpass Filters
Kouji Wada, Atsushi Suzuki, Osamu Hashimoto, and
Hiroshi Harada*
College of Science and Engineering,
Aoyama Gakuin University
6-16-1 Chitosedai Setagaya-ku
Tokyo,157-8572 Japan.
Phone & Fax : +81-3-5384-1121,
E-mail: wada@ee.aoyama.ac.jp, atsushi@ee.aoyama.ac.jp, and
hasimoto@ee.aoyama.ac.jp
*Yokogawa Denshikiki Co.,Ltd.
500 Soya, Hadano-shi, Kanagawa-ken,
257-8502 Japan.
Phone & Fax.: +81-463-84-8763, E-mail
:hirosh_harada@ydk.yokogawa.co.jp
Abstract The purpose of this study is to examine the
basic properties of λ/4 resonators and there application to
bandpass filters(BPFs). First, the improvement of out-of-band characteristics
such as sharp skirt characteristics and low spurious responses by the tapped λ/4 resonator BPFs are discussed.
We also examine the improvement of skirt characteristics by multiple
attenuation poles on the basis of extended tapped λ/4 resonator BPF. The method
for improving out-of-band characteristics on the basis of the tapped resonator
is effective to the λ/4 resonator as well as the open-ended l/2 resonator.
Key
words l/4
Resonator, Tap-Connection, Attenuation Pole, Spurious Responses, Bandpass
Filter
EMCJ2000-83,
MW2000-127 (2000-10)
Considerations of Branch Line Couplers of
Power Split Ratio 2:1
Yoshichika Ohta, Shaozhou Zhang, and Iwata
Sakagami*
Department of Electrical and Electronic
Engineering, Muroran Institute of Technology
Mizumoto-cho, Muroran-shi, 050-8585 Japan
E-mail: isee@eee.elec.muroran-it.ac.jp
*Faculty of Engineering, Toyama
University
Gofuku, Toyama-shi, 930-8555 Japan, Tel:
076-445-6761
E-mail: sakagami@eng.toyama-u.ac.jp
Abstract A spurious-notch may occur by the design of a
stub, in the branch-line coupler that materialized 1/4 miniaturization in
comparison to area by compacting a transmission line by using two-step stubs.
In this paper, It examines about spurious notch of the miniaturized branch-line
coupler of power split ratio 2:1 . Also, we propose a branch-line coupler that
has a point that all S parameters agree in a higher frequency than a center
frequency. On the circuit that compensated a discontinuous part and lose joint
errors between 2 step stubs, the experimental results are reported.
Key
words Branch-line coupler, Size-reduction, Spurious-notch,
Discontinuities Compensation, Mode impedance
EMCJ2000-84,
MW2000-128 (2000-10)
A Low Loss Series Power Combiner Using
Suspended Striplines
Yukihiro Tahara, Hideyuki Oh-Hashi, Tomohiko Ban,
Kazuyuki Totani, and Moriyasu Miyazaki
Mitsubishi Electric Corporation Information
Technology R&D Center
5-1-1, Ofuna, Kamakura City, Kanagawa,
247-8501 Japan
Phone: +81-467-41-2532/Fax:
+81-467-41-2519, E-mail: tahara@isl.melco.co.jp
Abstract This report proposes a combiner which consists of
suspended stripline couplers in series with additional parallel capacitances.
The capacitances compensate the difference of phase velocities between the,
even-mode and the odd-mode in the suspended stripline couplers . The fabricated
combiners have realized good performances in insertion loss which is less than
0.3dB over a bandwidth of 10 % in the S-band.
key
words: suspended striplines, power combiners,
directional couplers
EMCJ2000-85,
MW2000-129 (2000-10)
RF Characteristics Dispersion of the
L-Band Glass-Epoxy 5-bit Phase Shifter Module using SW-BANK Chips and Low Cost
L, C Chips
Kensuke Nakajima, Noriharu Suematsu, Eiji
Taniguchi, Hideji Takeda, Toshiyuki Shinbo, Yoshinobu Sasaki, and Tadashi
Takagi
Information Technology R&D Center
Mitsubishi Electric Corp.
5-1-1 Ofuna, Kamakura-city, Kanagawa,
247-8501 , JAPAN
e-mail: kensuke@isl.melco.co.jp
Abstract RF characteristics dispersion and reliability of the
low cost L-band 5-bit phase shifter module is described. This phase shifter
module consists of GaAs SW-BANK chips and chip. inductors/capacitors mounted on
glass-epoxy substrate. The calculated and fabricated RF characteristics
dispersion of the phase shifter module show that the tolerance of chip
inductors/capacitors is enough smal1 for phase shifter use. The results of two
reliability tests are indicated that this module configuration is feasible for
a phase shifter.
key
words: Microwave frequency, Phase shifter
module, L, C Chip, SW-BANK, Dispersion, Reliability
EMCJ2000-86,
MW2000-130 (2000-10)
An L Band Even Harmonic Balanced Mixer
With p-Type
Low Pass Filter
Kenji Kawakami, Daisuke Yamaguchi, Hiroshi
Ikematsu, and Yoji Isota
MITSUBISHI ELECTRIC CORPORATION
5-1-1 Ofuna, Kamakura-city, KANAGAWA
JAPAN
TEL:+81-467-41-2549, FAX:+81-467-41-2519,
E-mail: kawaken@isl.melco.co.jp
Abstract This paper presents an L band even harmonic balanced
mixer with π-type low pass filter. Conversion gain of
the mixer is improved by using the p-type low pass filter between
the balun and the diodes. The conversion gain from -6.0 dB to -5.5 dB is
achieved within the frequency range from 1050 MHz to 1850 MHz.
Key words: Even harmonic mixer, Balun,
Wide band characteristics
EMCJ2000-87,
MW2000-13 (2000-10)
Wide-Band Direct Synthesizer driven by
DDS Employing Phase Accumulator Over Flow Kenichi
Tajima, Masaomi Tsuru, Hiroshi Ikematsu, Kenji Itoh, and Yoji Isota
Mitsubishi Electric Corp., 5-1-1 Ofuna,
Kanagawa 247-8501, Japan
TEL : 0467-41-2549 , FAX : 0467-41-2519 ,
E-mail: ktajima@isl.melco.co.jp
Abstract A wide-band method of a narrow step, fast
frequency switching, low phase noise direct synthesizer was proposed in this
report. The proposed synthesizer consists of a quadrature mixer and DDS for a
base-band signal generator of the mixer. The proposed synthesizer forces to
overflow a DDS phase accumulator to accomplish twice wider bandwidth compared
with a typical direct synthesizer driven by a DDS. Also DDS is capable to
switch frequency phase continuously. A developed 2GHz-band frequency
synthesizer with 120MHz output DDS achieved phase continuous frequency
switching of 240MHz band employing the proposed method. Spurious level below
-29dBc and dissipated current of 69mA were also obtained.
Key
word: Frequency synthesizer, Phase locked
loop, DDS, Wide-band, Phase accumulator, Over flow
EMCJ2000-88,
MW2000-132 (2000-10)
Ultra Low-Noise Wideband Amplifier with a
Series Drain Resistor and Lower Resonant Matching Stubs
Hidenori Yukawa, Kazuhiko Nakahara, Hiroshi
Kajikawa, and Yasushi Itoh,
Mitsubishi Electric Corporation
Ofuna 5-1-1 , Kamakura, Kanagawa,
247-8501 Japan
Tel: +81-467-41-2538, Fax:
+81-467-41-2519, E-mail:yukawa@isl.melco.co.jp
Abstract Low-noise amplifiers for use in the mobile and
satellite communication terminals are required to show small reflections, low
noise figure, miniaturized size, and low power consumption. To achieve small
reflections and low noise figure simultaneously, a source inductor is widely
used in the design of low-noise amplifiers. The source inductor, however,
produces instability, poor isolation, and larger size of the amplifier. To
address this problem, we present a design method to employ a series drain
resistor for high stability, high isolation, and small size in addition to
matching stubs comprised a short-circuited stub and a capacitor for simultaneous
gain and noise matching. In this paper, the design method and its application
are described.
key
word: low-noise amplifier, wideband, noise
figure, series drain resistor, microwave
EMCJ2000-89,
MW2000-133 (2000-10)
Efficient Spatial Power Combining of
94GHz-band Gunn Diodes
Jongsuck Bae, Masayuki Fujita, and Koji Mizuno
Research Institute of Electrical
Communication, Tohoku University
2-1-1 Katahira, Aobaku, Sendai 980-8577,
Japan
TEL: 022-217-5514, FAX: 022-217-5516
bae@riec.tohoku.ac.jp
Abstract A millimeter-wave oscillator which incorporates
an overmoded-waveguide resonator with an array of TE10_ mode
waveguides containing Gunn diodes, has been developed as a means for achieving
highly efficient spatial power combining. An efficiency of about 74 % and an
output power of 0.2 W (CW) at 94GHz, has been achieved with a 3 x 1 waveguide
Gunn diode array with dimensions of 8.1x8.2x3O mm3.
key
words: millimeter wave, spatial power combiner,
overmoded waveguide, Gunn diode
EMCJ2000-90,
MW2000-134 (2000-10)
A Report on the 2000 IEEE MTT-S
International Microwave Symposium
O. Ishida, S.Kitazawa*, H. Kondoh**, N.Suematsu, M. Tsuji***, A. Yamagishi****
Mitsubishi
*Matsushita Nitto
**Hitachi
***Doshisha Univ.
****NTT
Abstract This paper summarizes the 2000 IEEE MTT-S
International Microwave Symposium held at Boston, Massachusetts, U.S.A. from
June 11 to 16. The numbers of attendees and presented technical papers were
12,5000 and 516, respectively, and broke the highest record of last year. The
authors who attended the symposium review topics in the technical field of
amplifiers, oscillators, converters and control circuits, passive circuits, and
electromagnetic field analysis
key
word: microwave device circuit, system,
electromagnetic field, conference report
EMCJ2000-91
(2000-11)
Three-Dimensional Susceptibility Maps
Made by Using Electromagnetic Fields of Low Speed Rotation
Kimitoshi Murano and Yoshio Kami
The University of Electro-Communications
1-5-1 Chofugaoka, Chofu-shi, Tokyo 182-8585
Tel:+81-424-43-5241, E-mail:
murano@ice.uec.ac.jp
Abstract This report describes a way of making
susceptibility map, which shows susceptibility characteristics of equipment
under test (EUT). The map is made by applying electromagnetic fields of low
speed rotation (rotating fields) to EUT. The rotating fields are those of which
polarization rotates two-dimensionally at extremely low speed. By using the
fields together with a turntable, three-dimensional radiated susceptibility
characteristics (3D susceptibility map) of EUT can be obtained. To confirm the
usefulness of this method, some experiments are conducted. Also those results
show that susceptibility/immunity weak points can be found out by using the map
key
words: susceptibility map, electromagnetic
fields of low speed rotation, radiated immunity test method
EMCJ2000-92
(2000-11)
Evaluation of Decoupling Circuits by A
Miniature Magnetic Field Probe with Multilayered Glass Ceramic Substrate
Naoya Tamaki, Norio Masuda, and Kazuyoshi Ishizaka*
EMC Engineering Center, Production
Technology Laboratories, NEC Corporation
4-1-1 , Miyazaki, Miyamae-ku, Kawasaki,
Kanagawa, 216-8555, Japan
TEL: +81-44-856-8428 E-Mail:
n-tamaki@ap.jp.nec.com
*NEC Glass Components, Ltd.
4-3, Nanpeidai, Miyamae-ku, Kawasaki,
Kanagawa, 216-0024 Japan
Abstract A miniature shielded loop probe for measurement
of magnetic fields near LSI packages and printed circuit board(PCB) has been
developed. This probe is designed based on a multilayered glass ceramic
substrate, and achieves spatial resolution of 250μm, which is 4 times greater
than that of previous one using FR4-PCB. Improving a transitional structure
between a coaxial cable and a strip line connected to the loop enabled to
obtain the output which is proportional to frequency in the range below 3GHz.
The effectiveness of a decoupling capacitor connected to power supply terminal
of LSI is evaluated by measurement of RF currents flowing on both LSI-side
trace and power supply-side trace to the decoupling capacitor.
Key
word: shielded loop, glass ceramic substrate,
spatial resolution, decoupling circuits
EMCJ2000-93
(2000-11)
Common Mode Signal Rejection
Characteristics by Ferrite Core in Transmission Line
Naoki Yamamoto, Keisuke Morita, Yoshifumi
Shimoshio, Hiroaki Koga, and Masamitsu Tokuda*
*Dept. of Information and Communication
Engineering, Kumamoto National College of Technology
2659-2 Suya, Nishigoshi-machi,
Kikuchi-gun. Kumamoto 861-1102, Japan
Tel.: +81-96-242-6069 naoki@tc.knct.ac.jp
** Dept. of Electric Engineering, Kyusyu
Institute of Technology
Abstract This paper describes how the common mode signal
in transmission line between two electronic devices can be rejected by a
ferrite core inserted through the line. A simple four-port chain matrix for the
core is derived from the two-port chain matrix of the core. All of common mode
rejection characteristics can be calculated by using this chain matrix. Common
mode rejection characteristics about the number of wire- turns passing the core
is investigated.
Key
word: Ferrite core, Balanced lines, Common
mode noise, Four-port network, Ferrite core, Chain matrix
EMCJ2000-94
(2000-11)
The experimental research On Suppressing
the electromagnetic Wave Induced to an earphone cable while using the cellular
phones
Hiroshi Ono, Ifong Wu*, Shigeyosi Yoshida, and
Osamu Hashimoto**
Tokin Corporation
6-16-1 Chitosedai, Setagaya-ku, Tokyo
157-8572, JAPAN
Tel. & Fax.: 03-5384-1121, E-Mail:
onoh@tokin.co.jp and ifong@ee.aoyama.ac.jp
*College of Science and Engineering, Aoyama
Gakuin University
Abstract The noise suppression sheet had adapted to an
earphone cable of the cellular phone to suppress the electromagnetic wave
conducted to the head parts through the earphone cable, and its effect had experimentally
verified. In the experiment, the electromagnetic wave coupled at one end of the
earphone cable by an mono-pole antenna which imitated the antenna of the
cellular phone, was made to lead to the other end which had connected to the
head imitated phantom. At first, the electric field strength distribution of
the electromagnetic wave induced to the cable had been measured, and then using
the noise suppression sheet which is made of a magnetic-polymer-composite
material, the suppression effect was measured, changing the position, the
dimension of the noise suppression sheet or the number of the placement,
respectively. As the result, it was confirmed that it is more effective when
the noise suppression sheet is placed at where the electric field strength
shows the minimum, and also confirmed in quantitatively, that the suppression
effect increases with the increase in the dimension or the number of the
placement of the noise suppression sheet.
Key
word: Noise suppression sheet, Head phantom,
Earphone, Monopole antenna
EMCJ2000-95(2000-11)
Electromagnetic Environment of Cellular
Phone Frequency Band
Yoshinobu Hayashl and Takashi Shinozuka*
Electromagnetic Compatibility Research
Laboratories Co., Ltd.
ICR Building., 6-6-3
Minami-Yoshinari,Aoba-ku,Sendai,989-32 Japan
Phone +81-22-279-3781 Fax +81-22-279-3640
E-mail rin@emc-l.co.jp
*Communications Research Laboratories,
M.P.T.
Abstract The cellular phone has become very popular. It worries
about whether the electromagnetic wave that radiate from the cellular phone
makes malfunction for the computers or other electronics devices. The necessity
for examining the influence which the electromagnetic wave which radiate from
the cellular phone gives the device has come out. The purpose of our
measurement is to offer basic data for influence investigation. We measured a
statistical parameter of electric field strength of the cellular phone
frequency band on the 2 measuring points. As a result, maximum electric field
strength under the measurement was ll5dBμV/m. Moreover, the rate of
time for electric field strength to exceed 90dBμV/m by the observation of 24
hours was about 0.l. We calculated Probability Distribution Function by
modeling the measurement place. And then, we compared it with the measurement value.
Key
word: Cellular phone frequency band,
Probability Distribution Function, Measurement of electromagnetic environment,
APD measuring equipment
EMCJ2000-96
(2000-11)
DOA Finding of a Single Short Pulse by
Vertically Waveform Reconstruction.
Masanori Ishii and Takashi lwasaki
Polarized Department of Electronic
Engineering, The University of Electro-communications
1-5-1 Chofugaoka, Chofu ,Tokyo, 182-8585
, Japan
Phone : 0424-43-5189, E-mail: ishiim@snow.ee.uec.ac.jp
Abstract A method for the finding direction of arrival (DOA) of
a single short pulse has been developed using a waveform reconstruction
technique with complex antenna factors (CAFS). However the conventional square
loop antenna is not applicable to the DOA in the free space. In this paper, a
dipole antenna complex is adopted. This antenna complex has sensitivity for
only vertically polarized components. The results of a simulation and an
experiment show the possibility to use this dipole antenna complex for this
waveform reconstruction method.
key
words: DOA, single short pulse, dipole antenna
complex ,waveform reconstruction, CAF, FTF
EMCJ2000-97
(2000-11)
Evaluation of an Antenna Calibration Test
Site (CALTS) According to the CISPR Standard
Takeshi Yoshida, Tomokazu Takita, Takashi Iwasaki,
and Yoshitaka Goto
Department of Electronic Engineering, The
University of Electro-communications
1-5-1 Chofugaoka,Chofu,Tokyo,
182-8585
Phone: 0424-43-5189, E-mail :
yoshida@snow.ee.uec.ac.jp
* Kyoritsu Corporation
14-1 Sengencho 4-chome Fuchu City,Tokyo,
183-0001
Phone: 042-365-6473, E-mail:
goto@kyoritsudenshi.co.jp
Abstract According to the evaluation method of antenna
calibration test sites (CALTS) provided by CISPR, the site attenuation of an
anechoic chamber is measured using two different sets of dipole antennas. The
both sets of dipole antennas give the same difference between the measured and
calculated results. Therefore, it makes clear that the difference is not due to
the characteristics of antennas but the quality of the anechoic chamber
key
words: CALTS, Site Attenuation, Dipole Antenna,
balun
EMCJ2000-98
(2000-11)
Analysis of Relationship between LSI
Operation Modes and Near Electromagnetic Field of Power Supply Lines
Ken Nakano, Satoru Haga, and Toshio Sudo
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 To study the relationship between LSI operation modes and
near electromagnetic field, the test printed circuit board with LSI operating
in specified mode was developed and its near-field magnetic distribution was
measured. The measurements near bypass capacitors and above ground plane show
that I/O buffer operation mode has a few different peaks in frequency compared
with other internal operation modes. The peaks are found to be relevant to
resonant frequencies between power and ground planes. The results show that
ground current of the noise source is considerably affected by the impedance
between power and ground planes when external traces are driven.
key
words: LSI, Operation Mode, Power Supply Line,
Electromagnetic Field, PCB, Impedance
EMCJ2000-99
(2000-11)
An Analysis of Absorption Characteristics
A Paintable Millimeter-Wave Absorber for Near Field
Ken Morishita, Tetsu Soh*, and Osamu Hashimotot
Dept. of Electronics and Electrical
Engineering. Aoyama Gakuin University
Setagaya-ku Chitosedai 6-16-1
Tokyo,157-8572 JAPAN
Phone & Fax: 03-5384-1121, E-Mail :
morisitaCee.aoyama.ac.jpand
hasimoto@ee.aoyama.ac.jp
**Engineering, Aerospace division, The
Yokohama Rubber Co., Ltd.
Abstract In this study, the
absorption of previously proposed paintable wave absorber is examined in the
near field on the basis of the coupling characteristics between half-wavelength
dipole antennas arranged near the absorber by using Finite Difference Time
Domain (FDTD) method. We calculate the antenna coupling level under the change
of the size of the absorber, the distance between the absorber and the antenna
and the distance between antennas, and then the calculated result is evaluated
as the absorption. As a result, it was confirmed that the absorption of the
absorber significantly decreased about 8.8-9.4 dB in the near field, and it
also produced the contrary effect under the condition mentioned before
Consequently, the absorption of the paintable wave absorber arranged near the
wave source was confirmed quantitatively.
Key
words: paintable wave absorber, near field,
coupling characteristics, FDTD
method
EMCJ2000-100
(2000-11)
Analysis for Transmission Characteristics
of Microstrip Line Covered with Lossy Magnetic Sheet
Nishikata, Atsuhiro and Saito, Akihiko
Tokyo Institute of Technology
.
2-12-1, O-okayama, Meguro-ku, Tokyo
152-8552 Japan
nisikata@cradle.titech.ac.jp
Daido Steel Co. Ltd
Abstract The rubber composite material, in which
the soft magnetic metal powder is highly mixed, is effectively being used for
EMI countermeasures above 1GHz. The composite material can be used, for
example, for the resonance suppression of metal enclosure of amplifiers, as
well as the coupling suppression between transmission lines. In this report,
the rubber composite material sheet is put on the microstrip line to give it
low-pass-filter characteristics, and the problem is numerically analyzed.
First, the propagation constant as well as the characteristic impedance is
calculated; and then, the transmission and reflection characteristics of a
section is evaluated. Since the complex
refraction index of the composite material is relatively high compared
to that of dielectric layer of printed circuit board, the quasi-TEM
approximation does not hold. Therefore, the Finite Difference Frequency Domain
method(FDFD method) is introduced which can count for all the electromagnetic
components. In the formulation, the Yee’s grid is used which is popular in FDTD
method. The formulation assumes that the complex relative permittivity and the
complex relative permeability of the material as diagonal tensors with respect
to the coordinate system.. In the calculation, the material is assumed to be
isotropic, and the measured material constants are used. In the experiment, the
S11 and S21 parameters of the composite-material-covered
section of the microstrip line are measured by network analyzer. The calculated
result shows good agreement with measured one in their tendency of frequency
characteristics.
Key words: microstrip lines, EMI, filter, soft magnetic metal, composite material, FDFD method