Osamu Fujiwara,
Associate Editor
Following are abstracts of papers from previous EMC symposia, related conferences, meetings and publications.
Bob Hunter
Consultant
r.d.hunter@ieee.com
Sha Fei
EMC Research Section, Northern Jiatong University, Beijing, China
emclab@center.njtu.edu.cn
Ferdy Mayer
L.E.A.D., Maisons, Alfort France
FerdyMayerLEADFrance@compuserve.com
Maria Sabrina Sarto
Department of Electrical Engineering, University of Rome, Italy
sarto@elettrica.ing.uniroma1.it
Engineering college/university libraries, public libraries, company or corporate libraries, National Technical Information Services (NTIS), or the Defense Technical Information Center (DTIC) are all possible sources for copies of abstracted articles of papers. If the library you visit does not own the source document, the librarian can probably request the material or a copy from another library through interlibrary loan, or for a small fee, order it from NTIS or DTIC. Recently it became clear that EMCABs were more timely than publications which were being listed in data files. Therefore, additional information will be included, when available, to assist in obtaining desired articles or papers. Examples are: IEEE, SAE, ISBN, and Library of Congress identification numbers.
Also, the steering staffs of the Japan Technical Group and the EMC Japan Tokyo Chapter have offered to act as a central point for requests of papers abstracted here. Most of the papers will be available in Japanese only. Abstracts of papers from EMC Japan will be clearly identified. As a member of the steering staff, I will assist in routing your request to the author(s) but will not translate the papers.
Some of the Chinese papers are not available in English. Professor Sha Fei, EMC Research Section, Northern Jiatong University, has offered his time and assistance in routing requests for papers to appropriate author(s). He is not furnishing a translation service.
As the EMC Society becomes more international, we will be adding additional worldwide abstractors who will be reviewing articles and papers in many languages. We will continue to set up these informal cooperation networks to assist members in getting the information or contacting the author(s). We are particularly interested in symposium proceedings which have not been available for review in the past. Thank you for any assistance you can give to expand the EMCS knowledge base.
A ZERO-CURRENT-SWITCHING PWM FLYBACK CONVERTER WITH A SIMPLE AUXILIARY SWITCH
H. S-H Chung+, S.Y.(Ron) Hui + and W-H Wang++
+Dept. of Electronic Engineering, City University of Hong Kong, Hong Kong,
++Dept. of E.S., University of Sydney, Sydney, Australia.
IEEE Transactions on Power Electronics, March 1999, pp. 329-342.
Abstract: It is well known that Switch Mode Power Supplies (SMPS) that use “soft switching” generate less conducted emissions than the “hard switched” units. A simple modification, an auxiliary winding, a switch and a small capacitor, converts a conventional isolated flyback PWM circuit to a ZCS (Zero-Current Switching) circuit with several advantages, including reduced conducted emissions. The analysis in the paper is complemented with measured data on a multi-output 80 W circuit. A simplified design procedure is shown by an example.
Index terms: Conducted emission reduction, soft-switching flyback SMPS
A STUDY ON THE OPTIMIZATION OF A 60 GHz WIRELESS LAN INSTALLATION ENVIRONMENT
Tomoya KUBO, Masafumi KIMURA and Risaburo SAT0, Electromagnetic Compatibility Research
Laboratories Co., Ltd., 6-6-3, Minami-Yoshinari, Aoba-ku, Sendai, 989-3204 Japan
Proceedings of 1999 Asia Pacific Microwave Conference, Singapore, November 30 —
December 3, pp.178-181
Abstract: This paper describes the conditions for placing electromagnetic absorbers to control the delay waves appearing in a 60 GHz band wireless LAN installation environment. It was found that absorbers located at the reflection points of the waves, which were calculated using a ray-tracing method simulation, could suppress the delay waves effectively, and the level of delay waves could be controlled by the size of the absorber.
Index terms: Wireless LAN, absorber location, ray-tracing method, computer simulation
CALCULATION OF LOAD EFFECT PRODUCED BY FERRITE CORE ATTACHED TO WIRE ABOVE A GROUND PLANE
Al Zaher Samir and Osamu Fujiwara, Faculty of Engineering, Nagoya Institute of
Technology, Showa-ku, Gokiso-cho, Nagoya 466-8555 Japan, Phone: +81-52-735-5421, Fax:
+81-52-735-5442, E-mail: fujiwara@odin.elcom.nitech.ac.jp
Proceedings of 1999 Asia Pacific Microwave Conference, Singapore, November 30 —
December 3, pp.182-185
Abstract: Ferrite cores are commonly attached to a cable/wire to reduce the electromagnetic noise emission from digital information equipment. In this paper, an equivalent circuit for the load effect produced by a ferrite core attached to a wire above a ground plane was considered. A practical method for determining the equivalent circuit parameters was presented, and the resultant load effect was calculated. The validity was confirmed by measurements of scattering transmission parameters for the wire with attachment of a commercially available ferrite core above a ground plane.
Index terms: Wire above a ground, ferrite core, load effect, equivalent circuit
RISE TIME EFFECTS ON CROSSTALK IN HIGH-SPEED MICROSTRIP TRANSMISSION LINES
Settapong Malisuwan and Vichate Ungvichian, Chulachomklao Royal Military Department of
Electrical Engineering Academy, Nakhon-Nayok, Thailand, Department of Electrical
Engineering EMI R&D LAB, Florida Atlantic University, Boca Raton, Florida, USA
Proceedings of 1999 Asia Pacific Microwave Conference, Singapore, November 30 —
December 3, pp.202-205
Abstract: Effects of a high-speed pulse with rise time (quadratic-linear-quadratic transition) on crosstalk along microstrip transmission lines are investigated. Closed form analysis equations for coupled microstrip lines have been used to calculate the crosstalk transfer function. The substrate loss, line loss, line thickness correction factor, and cover plate correction factor are included in the calculation. The simple closed form expressions of crosstalk in this paper are given in a form such that they can be implemented easily on a desktop computer or a programmable pocket calculator.
Index terms: Microstrip lines, rise time, crosstalk, closed form analysis
MEASUREMENT FOR ELECTROMAGNETIC SUSCEPTIBILITY OF THE ELECTRONIC MEDICAL EQUIPMENT
Han-Kil Bae and Jong-Heon Kim, Dept. of Radio Sci. and Engr., Kwangwoon Univ., 477-l
Wolgye-dong, Nowon-ku, Seoul 139-701, Korea E-mail: ihkim@daisy.kangwoon.ac.kr
Proceedings of 1999 Asia Pacific Microwave Conference, Singapore, November 30 —
December 3, pp.206-209
Abstract: In this paper, the electromagnetic immunity of electronic medical equipment was tested by employing a standard test method for medical equipment. In addition, the electromagnetic interference to the medical equipment caused by two different types of portable transceivers have been studied. In this study, 20 medical equipments of 14 different types were investigated. There are a patient monitor, an infusion pump, a neonatal incubator and so on. In the case of the EMS test, interferences were detected for seven medical products of four different types (53.3%) such as the patient monitor. For the two portable transceivers, 16 medical equipments of 11 different models (80%) were affected. The experiment results show that the malfunction of the electronic medical equipments is dependent upon the frequency range and the electric field strength of the mobile phones.
Index terms: Medical equipment, portable transceiver, malfunction, electromagnetic immunity test
FORMATION OF HOT SPOTS IN THE HUMAN EYE FOR PLANE WAVE EXPOSURES
A. Hirata, G. Ushio, and T. Shiozawa, Department of Communication Engineering, Osaka
University, Yamacla-oka 2-1, Suita-shi, Osaka, 565-0871, Japan
Proceedings of 1999 Asia Pacific Microwave Conference, Singapore, November 30 —
December 3, pp.477-480
Abstract: The interaction between the human eye and EM waves in the hot spot frequency range is investigated with the aid of the FDTD method. Numerical results show that hot spots appear in a certain frequency range, and the location and number of hot spots depend upon the frequencies of the incident wave. In particular, hot spot formation is found to be mainly caused by the resonance due to the geometrical structure of the eye. Additionally, temperature rises in the human eye are calculated to assess the possibilities of microwave-induced cataract formation. The numerical estimate shows that the EM wave with the power density 22 mW/cm^2 induces a temperature rise of 3.0 degrees centigrade, the threshold temperature rise for cataract formation.
Index terms: Human eye, electromagnetic wave exposure, FDTD method, temperature rise, hot spot formation
DEPENDENCE ON ANTENNA OUTPUT POWER OF TEMPERATURE RISE IN HUMAN HEAD FOR PORTABLE TELEPHONES
Jianqing Wang, Takahiro Joukou and Osamu Fujiwara, Department of Electrical and
Computer Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya
466-8.555, Japan, E-mail: wang@odin.elcom.nitech.ac.jp
Proceedings of 1999 Asia Pacific Microwave Conference, Singapore, November 30 —
December 3, pp.481-484
Abstract: Since biological hazards due to RF exposure are caused mainly by a temperature rise in tissue, the localized specific absorption rate (SAR) should be related to the temperature rise in the human head for portable telephones. Although the SAR is known to be directly proportional to the antenna output power of portable telephones, the dependence of temperature rise on the antenna output power remains unclear. In this paper, the relationship between the peak temperature rise in a human head and the antenna output power is investigated by using the finite-difference time-domain (FDTD) method. It is found that the peak temperature rise is approximately proportional to the antenna output power below 1 W and also that the peak temperature rise in the brain can be estimated from its blood-flow and heating potential.
Index terms: Portable telephone, human head, FDTD method, antenna input power, SAR, temperature rise
SAR INDUCED IN A MULTILAYERED SPHEROIDAL HEAD MODEL BY THE EM FIELDS IRRADIATED FROM A CELLULAR PHONE
X.K. Kang, L.W. Li, M.S. Leong, P.S. Kooi and T.S. Yeo , Communications & Microwave
Division, Department of Electrical Engineering, National University of Singapore, 10 Kent
Ridge Crescent, Singapore 119260.
Proceedings of 1999 Asia Pacific Microwave Conference, Singapore, November 30 —
December 3, pp.485-488
Abstract: The recent development of cellular phones has resulted in an increasing public concern about the biological effects of electromagnetic (EM) fields on the human head. This paper presents the computation of the specific absorption rate (SAR) distribution inside a multilayered prolate spheroidal model of human head exposed to a GSM dipole, using spheroidal vector wave functions.
Index terms: Cellular phone, multilayered spheroidal head model, SAR, theoretical analysis
CALCULATION OF CURRENT IN A HUMAN MODEL INDUCED BY LOW FREQUENCY MAGNETIC FIELD
Boonchai Techaumnat, Shoji Hamada and Tadasu Takuma, Kyoto University, Kyoto
EMC-Japan meeting at Kyodai-Kaikan, Kyoto, December 3, 1999, EMC-99-1
Abstract: The paper describes the calculation result of induced current in a human model due to a 50 Hz uniform magnetic field. The calculation method is the boundary element method using a human model composed of the second order curved elements. Maximum current density was calculated at each z-plane in the human model. The overall maximum induced current was determined for the magnetic field in the horizontal direction from back to front and in the vertical direction. In the case of the horizontal magnetic field, five internal organs were simulated with ellipsoids and their maximum induced current was calculated.
Index terms: Numerical calculation, boundary element method, ELF magnetic field, human model, induced current
TEST METHOD OF ELF MAGNETIC SHIELDING EFFECTIVENESS USING MAGNETIC FIELD EXPOSURE METER
Kenichi Yamazaki+, Hideaki Yazaki++, Hiroyuki Satake+++ and Yasuo Okazaki+++ + Central
Research Institute of Electric Power Industry, ++ Tokyo University of Agriculture and
Technology, +++ Gifu University
EMC-Japan meeting at Kyodai-Kaikan, Kyoto, December 3, 1999, EMC-99-2
Abstract: A new test method for evaluation of ELF (extremely low frequency) magnetic shielding effectiveness was proposed. A cubic shielding box without any apertures and a magnetic field exposure meter, which contains a data storage function and placed in the center of the box, were used to characterize shielding effectiveness of several shielding materials. A procedure, an experimental setup and data formats of the proposed method are shown.
Index terms: ELF magnetic field, magnetic shielding, magnetic field exposure meter
ELF MAGNETIC FIELD MITIGATION NEAR ELECTRIC POWER LINES USING AUXILIARY CONDUCTOR LOOP
Hideaki Yazaki+, Yuzo Takahashi+, Kenichi Yamazaki++ and Tadashi Kawamoto++ + Tokyo
University of Agriculture and Technology, ++ Central Research Institute of Power Industry
EMC-Japan meeting at Kyodai-Kaikan, Kyoto, December 3, 1999, EMC-99-3
Abstract: Some investigations regarding ELF (extremely low frequency) magnetic field mitigation for the overhead power line were conducted. We focused on a mitigation method using an auxiliary conductor loop installed near the phase conductors. In this paper, the effect of the existence of conductor sag was investigated, for both passive and active loop methods. In addition, the concept of the current dipole moment was rewritten by a simple formula and some optimal conductor arrangements for effective active loop mitigation were shown.
Index terms: ELF magnetic field, passive loop, active loop, current dipole moment, conductor sag
STUDY ON A LOCATING SYSTEM OF A PARTIAL DISCHARGE OCCURRENCE POSITION FOR POWER DISTRIBUTION LINE
Hiroyuki Okamura+, Takamu Genji+, Makoto Kawasaki++ and Kiyoshi Oku++ + The Kansai
Electric Power Co., Inc., ++ Kansai Tech Co., Inc.
EMC-Japan meeting at Kyodai-Kaikan, Kyoto, December 3, 1999, EMC-99-6
Abstract: Equipment trouble may be caused by the partial discharge phenomenon that has its root in deteriorated insulation or contact. Besides the partial discharge pulse may generate an obstruction on television screen in area of low electric field strength. Under present condition we have to inquire poles one by one to specify that source. Since it is very inefficient, we developed the system mounted on a car, which analyze phase difference of pulse signals from partial discharge by receiving the signal on four antennas. The system can locate a partial discharge occurrence position in a short time. In this paper, the causes of location deviation in process with development of this system are reported.
Index terms: Partial discharge pulse, spatial phase difference method, antenna, global positioning system