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EMCABS |
EMC AbstractsOsamu 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.
MEASUREMENT OF NOISE SOURCE IMPEDANCE OF OFF-LINE CONVERTERS
Dongbing Zhang+1, Dan Y. Chen+2, Mark J. Nave+3,
and Dan Sable+4
+1 National Semiconductor, Santa Clara, CA; +2 Virginia Polytechnic
Institute and State University, Blacksburg, VA; +3 Network Appliance,
Sunnyvale, CA; and +4 Virginia Polytechnic Institute and State University,
Blacksburg, VA
IEEE Transactions on Power Electronics, September 2000, pp. 820-825
Abstract: The conducted noise emissions of Switch Mode Power Supplies operated off-line require line filters for their reduction to meet EMC regulations. The design of a line filter of predictable performance requires a knowledge of the noise source impedance of the SMPS involved using the insertion loss method. The measurement techniques for determining both common mode and differential mode source impedances are developed and compared with measured data. The attenuation of the line filter is then predictable.
Index terms: Design of line filters for off-Line SMPS, noise source impedance measurement, insertion loss method.
ANALYSIS AND SPECTRAL CHARACTERISTICS OF A SPREAD-SPECTRUM TECHNIQUE FOR
CONDUCTED EMI SUPPRESSION
K. K. Tse, Henry Shu-Hung Chung, S. Y. (Ron) Hui. And H. C. So
Department of Electronic Engineering, City University of Hong Kong, Hong Kong
IEEE Transactions on Power Electronics, March 2000, pp. 399-410.
Abstract: Frequency Modulation (FM) and Random Carrier Frequency (RCF) techniques have been applied to reduce conducted emissions of Switch Mode Power Supplies (SMPS). What has been lacking were analytic methods for comparing these techniques to the Pulse Width Modulation (PWM) scheme. For example, how much randomness is desirable for RCF dc-dc converter? This paper describes methods that permit the analytic predictions, hence comparisons, of the spectrums of conducted noise produced by the three converter methods. The analysis, confirmed by experiment, shows that RCF method is superior to FM and permits exploring the degree of randomness that is desirable.
Index terms: Spread spectrum in SMPS, random carrier frequency in SMPS, frequency modulation in SMPS, PWM converters, conducted EMI suppression in SMPS, random noise circuit hence comparison.
MEASUREMENT OF COMPLEX TRANSFER IMPEDANCES OF SHIELDED MULTICONDUCTOR CABLES
WITH SHIELD INHOMOGENEITIES INSIDE CABLE BUNDLES
Lorenz Jung, Jan Luiken ter Haseborg
Hamburg University of Technology, Dept. of Measurement Engineering /EMC, Harburger Schloss
Strasse 20, D-21071 Hamburg, Germany
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 83-88.
Abstract: The determination of the complex transfer impedances and transfer admittances of shielded multiconductor cables is the prerequisite for calculating disturbing currents on the inner wires of the cable. This paper shows a measurement procedure based on the improved triaxial measurement set-ups using multiconductor transmission line theory for evaluation. With this method of evaluation it is possible to determine individual transfer impedances and admittances for each inner conductor of a shielded multiconductor cable over a broad frequency range. In this paper the measurement method is extended to cables which are located inside a cable bundle.
Index terms: Shielded multi-conductor cable, complex transfer impedance, measurement, multi-conductor transmission line theory.
OPTIMAL UTILIZATION OF A REVERBERATION CHAMBER
Frank B.J. Leferink, Thomson-CSF Signal,
Environmental Competence Centre, P.O. Box 42, 7550 GD Hengelo, The Netherlands
leferink@signaal.nl
University of Twente, Faculty of Electrotechnical Engineering, Telecommunication
Engineering, P.O. Box 217, 7500 AE Enschede, The Netherlands
leferink@cs.utwente.nl
Wim C. van Etten
University of Twente, Faculty of Electrotechnical Engineering, Telecommunication
Engineering, P.O.Box 217, 7500 AE Enschede, The Netherlands
etten@cs.utwente.nl
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 201-206.
Abstract: The impact of the structure of a reverberation chamber, as used for electromagnetic compatibility testing, on spatial uniformity, isotropicity and quality factor are described. A new reverberation chamber with varying angles between wall, floor and ceiling and with vibrating walls is presented. Inside this Vibrating Intrinsic Reverberation Chamber (VIRC) a diffuse, statistically uniform electromagnetic field is created without the use of a mechanical, rotating, mode stirrer. This chamber results in a better homogeneity and increased field strength compared to conventional mode stirred reverberation chambers (MSC). Test results obtained in the VIRC are presented.
Index terms: New reverberation chamber, vibrating walls, EMC test.
RADIATED EMISSION OF AN ELECTRICAL CIRCUIT INSIDE A PENETRABLE SHIELDED
ENCLOSURE: A NUMERICAL TIME-DOMAIN APPROACH
Mauro Feliziani, University of L'Aquila, Department of Electrical Engineering,
67040 Poggio di Rio, L'Aquila, Italy
Francescaromana Maradei, University of Rome "La Sapienza," Department of
Electrical Engineering, Via Eudossiana 18, 00184 Rome, Italy
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 227-232.
Abstract: The electromagnetic field radiated by an electromagnetic source inside a shielded enclosure with penetrable walls is calculated by a numerical procedure based on the mixed Finite-Difference/Whitney-Elements Time-Domain (FD/WETD) method. The domain inside the enclosure is modeled by the WETD method, while the exterior domain is modeled by the FDTD method. The two methods are interfaced on the surfaces of the shielded enclosure by the impedance network boundary conditions (INBCs), which couple the tangential components of the electric and magnetic fields on both shield surfaces. The solution scheme of the resulting equation system is implicit-explicit. The proposed method is applied to analyze the radiated emission produced by an electrical circuit with lumped parameters placed inside the penetrable shielded enclosure adopting the formulation of the circuit-oriented WETD method.
Index terms: Electromagnetic source, penetrable shielded enclosure, radiated emission, numerical time domain approach.
EMC EFFECTS CAUSED BY RADIATED AND CONDUCTED ESD FIELDS
Francescaromana Maradei, University of Rome "La Sapienza," Department
of Electrical Engineering, Via Eudossiana 18, 00184 Rome
maeadei@elettrica.ing.uniroma1.it
Marco Raugi, Dept. of Electrical Systems and Automation, University of Pisa,
Via Diotisalvi 2, 56126 Pisa
raugi@dsea.unipi.it
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 339-344.
Abstract: In this paper a scattered field finite-difference time-domain (FDTD)
formulation is proposed to analyze an electrostatic discharge (ESD) event. Analytical
expressions for the field radiated during the ESD discharge phase are determined and
considered as incident fields during the current discharge phase. In order to take into
account the electromagnetic field penetration through shielding structures, the conductive
panels are efficiently modeled in the FDTD by the impedance network boundary conditions
(INBCs), which are suitably formulated in terms of scattered field. The method is applied
to carry out the analysis of ESD events in some configurations.
Index terms: Electrostatic discharge, radiated and conducted fields, shielding structure,
filed penetration, analysis.
INFLUENCE OF MICROWAVE OVEN DISTURBANCE ON SPREAD SPECTRUM SYSTEM
Takeshi Kowada, Takashi Shinozuka and Risaburo Sato
Electromagnetic Compatibility Research Laboratories Co., Ltd.
6-6-3 Minami-Yoshinari, Aoba-ku, Scndai, 989-3204 JAPAN
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 381-385.
Abstract: We have been examining the influence of electromagnetic disturbance that invade spread spectrum communication system. In these experiments, the amplitude probability distribution (APD) of the electromagnetic disturbance and the bit error rate (BER) of the communication system were measured and the relation between the two was evaluated quantitatively. Evaluation using the APD measurements was compared with the methods proposed by CISPR (peak measurement) and their respective noteworthy points were investigated. In addition, we will report together with communication quality evaluation results with microwave ovens on the market.
Index terms: Spread spectrum system, microwave oven, electromagnetic disturbance, statistical measurement, CISPR measurement.
MODELING OF GRIDS BY USING THE METHOD OF EQUIVALENT DIPOLES
Koen Vervoort, Alcatel Bell, Francis Wellesplein 1, B-2018 Antwerpen (Belgium)
Tel.: +32/3/240.92.76, Fax.: +32/3/240.99.88, e-mail: koen.vervoort@alcate1.be
Kathleen De Jongh, Ronald De Smedt,
Alcatel Bell, Francis Wellesplein 1, B-2018 Antwerpen (Belgium)
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 465-470.
Abstract: The shielding effectiveness of a grid in an infinite screen is determined by replacing the apertures by equivalent dipoles. The results correlate well with those obtained with a more rigorous simulation tool based upon the method of moments. The advantage of the present method is the capability to handle much larger grids. The key factor to characterize a grid is the polarizable density. As application, it is shown how the total air surface can be increased while keeping the same shielding effectiveness.
Index terms: Shielding effectiveness, grid, infinite screen, equivalent dipoles, rigorous simulation tool.
VARIABLES OF SE MEASUREMENTS PERFORMED IN MODE-STIRRED CHAMBERS
W.Kürner, A.Schwab
Institut für Elektroenergiesysteme und Hochspannungstechnik,
Universität Kahlsruhe
Engesserswasse 12, Gebäude 30.36 D-76131 Kahlusruhe, Germany
Telephone: +49 721 608 2520/252l Fax: +49 721 69 52 24
(Key contact: kuemer@ieh.etec.uns-karlsruhe.de
)
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 499-503.
Abstract: Shielding effectiveness (SE) measurements in Mode-Stirred Chambers include many unknown variables concerning the operation mode of the chamber and the evaluation of measurement data. This paper aims at determining the best operational mode – e.g. mode-tuned or mode-stirred mode - and the minimum number of test samples. The obtained results from SE measurements are compared to measurements carried out in an anechoic chamber. It is shown that both measurement environments are comparable concerning the average shielding effectiveness of an EUT.
Index terms: Shielding effectiveness, mode-stirred chamber, operation mode, measurement.
A SIMPLE METHOD FOR REPRESENTING PCBS IN EQUIPMENT ENCLOSURES
A Denton*, D W P Thomas*, T KonefaI+, T M Benson*, C Christopoulos*,
J F Dawson+,
A C Marvin+ and J Porter+
*The University of Nottingham, UK and +The University of York, UK
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 509-513.
Abstract: In this paper we show a simple method for representing printed circuit boards (PCBs) within an enclosure, allowing the shielding effectiveness (SE) of the loaded enclosure to be assessed with only a limited amount of information. A number of measurements of the SE of an enclosure loaded with PCBs are presented, showing the range of values of SE that can be obtained by loading the enclosure with different PCBs.
Index terms: Printed circuit board, enclosure, shielding effectiveness, measurement.
ELECTROMAGNETIC FIELDS PRODUCED BY PCB STRIPLINE AND MICROSTRIP INSIDE A
SCREENED RECTANGULAR ENCLOSURE: A CIRCUIT APPROACH
T. Konefal, J.F. Dawson, A. Denton*, T.M. Benson*, C. Christopoulos*, A.C.
Marvin,
S.J. Porter, D.W.P. Thomas*
University of York, UK and the *University of Nottingham, UK
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 587-592.
Abstract: The problem of radiation from a PCB microstrip or stripline trace inside a rectangular enclosure is addressed. A circuit approach is taken whereby the PCB trace couples into the enclosure by a mutual inductance and capacitance. The enclosure is treated as a superposition of transmission lines (one for each waveguide mode) short circuited at each end by the enclosure walls. The technique allows the rapid solution of complex field problems.
Index terms: Printed circuit board, rectangular enclosure, electromagnetic fields, circuit approach.
PRINTED CIRCUIT BOARD POWER BUS DECOUPLING USING EMBEDDED CAPACITANCE
Todd Hubing, UMR Electromagnetic Compatibility Laboratory
University of Missouri-Rolla, Rolla, MO 65409 USA
M. Xu, I. Chen, I. Drewniak, T. Van Doren and A. DuBroff
UMR Electromagnetic Compatibility Laboratory
University of Missouri-Rolla, Rolla, MO 65409 USA
Proceedings of 4th European Symposium on Electromagnetic Compatibility, Brugge, Belgium,
September 11 -15, 2000, pp. 639-642.
Abstract: The purpose of decoupling capacitors on printed circuit boards is to meet the instantaneous current demands of high-speed active devices while minimizing power bus noise. Embedded capacitance is an alternative to discrete decoupling capacitors and is achieved by taking advantage of the natural capacitance between the power and ground planes. This paper investigates the electrical properties of boards manufactured with four different kinds of embedded capacitance. These boards have power-ground plane pairs separated by very thin materials with high dielectric constants. It is shown that some kinds of embedded capacitance work significantly better than standard decoupling schemes using discrete decoupling capacitors.
Index terms: Printed circuit board, power bus noise, decoupling capacitor, embedded capacitance. EMC