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.
POWER FACTOR IMPROVEMENT USING DCM CUK CONVERTER WITH COUPLED INDUCTOR
G. Ranganathan and L. Umanand
Electrical and Computer Engineering, PO Box 3055, University of Victoria, Victoria V8W
3P6, Canada and Centre for Electronics Design and Technology, Indian Institute of Science,
Bangalore 560012, India
IEE Proceedings, Electric Power Applications, March 1999, pp. 231-236 (Vol. 146, No. 2).
Abstract: Most Power Factor Regulators (PFRs) in Continuous Conduction Mode (CCM) require bulky magnetics, PFRs in Discontinuous Conduction Mode (DCM) have high harmonic production. A modified Cuk converter, in the DCM, uses a coupled inductor to transfer ripple from the input to the output, thus reducing switching harmonics in the line current. The technique is compared with the boost converter and the flyback converter. Design details and results of a 500W prototype are presented.
Index terms: Modified Cuk converter, power factor improvement, reduction of line harmonics.
THREE-PHASE BUCK ACTIVE RECTIFIER WITH POWER FACTOR CORRECTION AND LOW EMI
Th.Gro Dfen+, E. Menzel ++ and J.H.R.Enslin++++
INSTA Elektro, LFCdensheid, Germany
++ Fachhochschule Dortmund, Germany
+++ The University of Stellenbosch, Republic of South Africa
IEE Proceedings, Electric Power Applications, November 1999, pp. 591-596 (Vol. 146, No. 6)
Abstract: A 3-phase rectifier is presented which has a high power factor, low harmonics (complying with IEC 1000-3-2 and 1000-3-4) requirements, and a low radiated EMI. Two single-phase buck circuits are connected to the neutral conductor. The active rectifier is controlled by a low-cost microprocessor to shift the current phasors so as to maintain a 120-degree separation. The relatively slow microprocessor, running at 16 MHz, is able, by using data from an EPROM lookup table and a specially developed algorithm, to control the active rectifier. A 12kW prototype, operated from 400Vac, has an output voltage that is continuously variable from 0-420V, loaded or unloaded.
Index terms: 3-phase buck active rectifier, power factor improvement, reduction of line harmonics, microprocessor controlled rectifier, radiated emission reduction in 3-phase rectifier.
MITIGATION OF RADIO INTERFERENCE IN XDSL* TRANSMISSION
Luc de Clercq; Miguel Peeters; Sigurd Schelstraete and Thierry Pollet
Alcatel Corporate Research Center, Antwerp, Belgium
IEEE Communications Magazine, March 2000, pp. 168-173
* XDSL is an abbreviation for several families of Digital Subscriber.
Abstract: Loops that include Asymmetric Digital Subscribe Loops (ADSL) and Very-high Speed Digital Subscriber Loops (VSDL) as members. This paper reviews the EMC issues of the copper parts of XDSL subscriber loops and the amateur radio bands. Several techniques for dealing with emissions (egress) by spectral shaping via window-ing and dummy tones in Discrete Multitone (DMT) are described. On the immunity (ingress) side, analog RFI canceling using an adaptive algorithm is described. Digital RFI canceling, using Fast Fourier Transform (FFT) and similar techniques is also covered. The measured performance of an Alcatel RFI canceller is presented.
Index terms: Digital subscriber loop/amateur radio EMC, spectrum management, ham radio EMC, spectral shaping, analog RFI cancellation, digital RFI cancellation.
ON THE NON-UNIQUENESS OF THE TRANSIENT SOLUTIONS OF MAXWELL'S EQUATIONS IN LOSSY MEDIUM
Huang Binke and Gang Wang
Xi’an Jiaotong University, Xi’an 710049, China
Proceedings of the China-Japan Joint Symposium on Antennas and Propagation, Xi’an,
China, March 16-17, 2000, pp.25-29.
Abstract: It was once reported that the two solutions of Maxwell's equations in Lossy medium derived with two commonly used techniques were different, which implies a non-unique solution of the wave equation in Lossy medium. Computer plots at the same computation accuracy demonstrate the consistency between the solutions of electric field strength solved in different methods. The discrepancy between the solutions can be viewed as the results of Gibbs phenomenon caused by cutting off the high frequency components in computing the integral of Harmuth's solution.
Index terms: Maxwell's equations, transient solution, non-uniqueness, Gibbs phenomenon.
ELECTROMAGNETIC SCATTERING BY MULTIPLE CONDUCTING OBJECTS
Jin Mouping, Liang Changhong and Shi Xiaowei
Xidian University, Xi’an 710071, China
Proceedings of the China-Japan Joint Symposium on Antennas and Propagation, Xi’an,
China, March 16-17, 2000, pp.45-48.
Abstract: The electric field integral equation (EFIE) is used with the moment method to treat problems of scattering by multiple conducting objects. The objects are modeled using planar surface patches. A block-iterative algorithm is proposed to solve the matrix equation. Numerical results for surface current density and scattered fields are given for conducting objects. The conclusion is obtained that generalized resonance (a very strong scattered field at some frequency) occurs in scattering by multiple conducting objects. The phenomenon is noticeable in EMC design.
Index terms: Electromagnetic scattering, multiple conducting objects, generalized resonance, moment method, iterative method.
DESIGN OF ARRAY ANTENNA WITH HIGH RADIATION EFFICIENCY FOR PORTABLE TELEPHONE
Kenji Sato, Qiang Chen and Kunio Sawaya
Faculty of Engineering, Tohoku University, Sendai 980-8579, Japan
Proceedings of the China-Japan Joint Symposium on Antennas and Propagation, Xi’an,
China, March 16-17, 2000, pp.133-138.
Abstract: A 1/4-wavelength monopole Yagi-Uda array antenna with a parasitic monopole element is developed for portable telephones to improve the radiation efficiency. The antenna has a broad bandwidth and the power absorbed by the user's head is lower than that of the 1/4-wavelength monopole antenna. Numerical analyses are performed by using the finite-difference time-domain method, and the validity of the numerical results is confirmed by measurement.
Index terms: Array antenna, portable telephone, radiation efficiency, electromagnetic absorption.
A POLE-TYPE DISTRIBITION TRANSFORMER MODEL FOR ELECTROMAGNETIC TRANSIENT STUDIES
Taku Noda+, Hiroshi Nakamoto++ and Shigeru Yokoyama++
Komae Research Laboratory, Central Research Institute of Electric Power Industry, 2-11-1,
Iwado Kita, Komae-shi, Tokyo 201-8511, Japan, takunoda@criepi.denken.or.jp
++Kyushu Electric Power Co., 2-1-82 Watanabe-dori, Chuo-ku, Fukuoka-shi, 810-8720, Japan
EMC-Japan meeting at Tokyo University of Agriculture and Technology, Tokyo, January 18,
2000, EMCJ99-121
Abstract: This paper proposes a transient simulation model of pole-type distribution transformers for electromagnetic transient studies. The proposed model takes into account the following effects: (1) capacitance between windings and an enclosure and also between primary and secondary windings, (2) skin effects of winding conductors and an iron core, and (3) multiple resonance due to the combination of winding inductance and turn-to-turn capacitance. Thus, the model accurately reproduces the frequency characteristics of a pole-type distribution transformer in a wide range of frequency. The parameters of the models can easily be determined by frequency-characteristic measurements using an impedance analyzer. Because of the above capability, the proposed model enables the accurate evaluation of over-voltages on distribution lines including consumer-side over-voltages. In this paper, a 10-kVA pole-type distribution transformer is modeled, and the proposed model is validated by comparisons between simulated and laboratory-test results.
Index terms: Pole-type distribution transformer, transient studies, EMTP, consumer-side over-voltages.
ENVIRONMENTAL MAGNETIC FIELD IN OFFICE BUILDING AND DEVELOPMENT OF MAGNETIC SHIELDINGS FOR CRT
Kiyotomi Miyajima, Kenichi Yamazaki and Seietsu Tomita
miyajima@criepi.denken.or.jp
Central Research Institute of Electric Power Industry, 2-11-1, Iwado Kita, Komae-shi,
Tokyo 201-8511, Japan
EMC-Japan meeting at Tokyo University of Agriculture and Technology, Tokyo, January 18,
2000, EMCJ99-122
Abstract: Personal computer monitors and televisions with cathode ray tube (CRT) may have jitters in the alternating magnetic field. We measured magnetic fields in the office building that had jitters problems. In this report, a diurnal variation and distribution of the magnetic fields that have harmonics are shown. The occurrence mechanism of harmonics is explained. And, a new mitigation method of jitters by the compensation magnetic field is presented.
Index terms: CRT, jitters, alternating magnetic field, magnetic shielding.
ANALYSIS OF ELECTROMAGNETIC FIELDS IN THE EXTERNAL AUDITORY CANAL FOR PORTABLE TELEPHONES WITH A HELICAL ANTENNA
Jiaquing Wang and Osamu Fujiwara
wang@odin.elcom.nitech.ac.jp
Department of Electrical and Computer Engineering, Nagoya Institute of Technology
EMC-Japan meeting at Tokyo University of Agriculture and Technology, Tokyo, January 18,
2000, EMCJ99-123
Abstract: A half-wave dipole antenna trends towards being adopted for the immunity test of medical devices for portable telephones from the viewpoint of operation efficiency. In this paper, assuming the immunity test of hearing aids, we analyzed the electromagnetic fields in the external auditory canal for a portable telephone with a helical antenna using the finite-difference time-domain (FDTD) method, and compared the results with that for a half-wave dipole exposure. The helical antenna was modeled as a stack of dipoles and loops with an adequate relative weight according to Lazzi and Gandhi's proposal. The head model was developed from magnetic resonance imaging (MRI) data of a Japanese adult head. As a result, it was found both for the helical antenna and half-wave dipole that the electric field shows a standing-wave characteristic in the external auditory canal, while the magnetic field decreases gradually with deepening into the external auditory canal. The electric field around the entrance of auditory canal for the helical antenna is stronger than that for the half-wave dipole, and vice-versa in the middle auditory canal. The magnetic field in the external auditory canal for the half-wave dipole is generally higher than that for the helical antenna.
Index terms: Portable telephone, immunity test, hearing aid, external auditory canal, FDTD analysis.
DEVELOPMENT OF ELECTROMAGNETIC ENVIRONMENT DESIGN SYSTEM FOR PRIVATE WIRELESS COMMUNICATION SYSTEM
Yuji Maeda and Kazuhiro Takaya
maeda@nttqn.tnl.ntt.co.jp
NTT Lifestyle and Environmental Technology Laboratories, 3-9-11 Midori-cho, Musashino-shi,
Tokyo 180-8585
EMC-Japan meeting at Tokyo University of Agriculture and Technology, Tokyo, January 18,
2000, EMCJ99-124
Abstract: Recently, several kinds of wireless communication systems such as 2.4 GHz band wireless LANs and cordless phones are used in buildings. Communication trouble due to electromagnetic interference has increased. This report describes the electromagnetic environment design system, which was developed to design ideal electromagnetic environments where communication trouble did not occur, for 2.4 GHz band wireless LANs and cordless phones. This system simulates the electromagnetic interference and effect of building materials for electromagnetic propagation. It can provide an ideal arrangement of center stations of wireless systems and an ideal indoor or outdoor environment where wireless systems are installed by estimating propagation characteristics and communication characteristics. The system configurations and two examples of actual design by using our system are introduced.
Index terms: Electromagnetic environment, private wireless system, propagation, ray tracing, communication characteristics.
A THEORETICAL STUDY ON ANALYSIS OF TV GHOST CAUSED BY SUPER HIGHRISE TOWER AND THE SUPPRESSION OF REFLECTED WAVE USING THE WAVE ABSORBER
Takahiro Aoyagi+, Yasutaka Shimizu+, Tishio Saito++ and Kenichi Harakawa++
+ CRADLE, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552,
Japan, aoyagi@cradle.titech.ac.jp
++ Research and Development Department, Takenaka Corporation, 15-1 Ohtsuka, Inzai, Chiba
270-1395, Japan.
EMC-Japan meeting at Tokyo University of Agriculture and Technology, Tokyo, January 18,
2000, EMCJ99-125
Abstract: In this report, TV ghosts caused by a super high rise tower are theoretically analyzed at the viewpoint of DU ratio. The scattering waves from three types of a super high tower are calculated taking into account distances between the transmission point, receive points and the tower. The effectiveness of the electromagnetic wave absorber is also considered when the absorber is put on the surface of the tower. As results, in this report, the absorber of -10 dB reflection coefficient is enough characteristics for cylindrical model to vanish the TV ghost problem caused by the reflected wave. For X-shaped model and the eight-column model, the absorber that has -15 dB characteristics, is satisfying.
Index terms: EMC, GMT, wave absorber, super high rise tower, TV ghost, scattering wave.
EXPERIMENTAL STUDY ON MANUFACTURING MAGNETIC WOOD USING ELECTROMAGNETIC WAVE ABSORBER IN GHZ BAND
Koichi Narita and Hideo Okahoka@iwate-u.ac.jp
Graduate School of Electronic and Electrical Engineering, Iwate University, 3-4-5, Ueda,
Morioka, 020-8551, Japan
EMC-Japan meeting at Tokyo University of Agriculture and Technology, Tokyo, January 18,
2000, EMCJ99-129
Abstract: The purpose of this article is to examine the possibility of using magnetic wood as a woody electromagnetic wave absorber in the GHz band. The results from measuring four types of different magnetic wood show that sandwich-type magnetic wood had good electromagnetic wave absorbing characteristics. This article covers experimental electromagnetic wave absorbing characteristics for sandwich-type magnetic wood under different parameters. The results showed that the 20 mm thickness sandwich-type magnetic wood which was made with 40 vol % mixture of Ni-Zn ferrite 400L with particle diameter of 600 micro-m over and 4 mm layer of magnetics, could be used as a woody electromagnetic wave absorber under 1.93 GHz.
Index terms: Electromagnetic wave absorber, magnetic wood, EMC, GHz band, magnetic-powder, composite material.