EMCABS

Following are abstracts of papers from previous EMC symposia, related conferences, meetings and publications.

EMCABS COMMITTEE
Bob Hunter, Consultant
r.d.hunter@ieee.org
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

“How Can I Get a Copy of an Abstracted Article?”
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 or 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, you can 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.
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. EMC

EMCABS: 01-02-2005
EVALUATION OF LIGHTNING SURGE CHARACTERISTICS INDUCED IN SUBSCRIBER LINES AT TELECOMMUNICATION CENTER IN A TROPICAL AREA
Tetsuya Tominaga +, Nobuo Kuwabara ++, Jun Kato +, Annuer Ramli +++, A. Halim Samad +++ and Hussein Bin Ahmad ++++
+ NTT Energy and Environment System Laboratories, NTT Corporation, Musashino-shi, 180-8585 Japan
++ Kyushu Institute of Technology, Kitakyushu-shi, 804-8550 Japan
+++ Telekom Malaysia R&D Berhad, UPM-MTDC, 43400 UPM Serdang, Malaysia
++++ Universiti Teknologi, Locked Bag 80990 Johor Bahru, Johor, Malaysia
tominaga.tetsuya@lab.ntt.co.jp
IEICE Transactions on Communications, Vol.E87-B, No. 3, March 2004, pp. 742-751
Abstract: Lightning surge protection devices must take into account the environment of the locale in which they are applied. This study compares surge data in a tropical area to that in a temperate area on both cables and wire pairs. Measurements were made using a Rogowski coil and current and voltage probes. The data shows that surges, normalized by the number of thunderstorm days and number of subscriber lines, agreed with results for temperate areas. That means that designs for temperate areas may be used if account is taken of the number of thunderstorm days in the area. Differential and common mode surges were similar.
Index terms: Lightning surge protection, surge measurement, surge at telecom centers in tropical areas.

EMCABS: 02-02-2005
CHAOS-BASED GENERATION OF PWM-LIKE SIGNALS FOR LOW-EMI INDUCTION MOTOR DRIVES: ANALYSIS AND EXPERIMENTAL RESULTS
Michele Balestra +, ++, Alberto Bellini +++, Sergio Callegari ++, +++, Riccardo Rovatti ++, ++++ and Gianluca Setti +, ++
+ DI, University of Ferrara, Italy
++ ARCES, University of Bologna, Italy
+++ DII, University of Parma, Italy
++++ DEIS, University of Bologna, Italy
mbalestra@ing.unife.it, alberto.bellini@unipr.it, scallegar@deis.unibo.it, rrovatti@deis.unibo.it, gsetti@ing.unife.it
IEICE Transactions on Electronics, Vol. E87-C, No. 1, January 2004, pp. 66-75
Abstract: PWM (Pulse Width Modulation) drives for induction motors are well known and generate substantial Electromagnetic Interference (EMI), both conducted and radiated. Prior art drives used an fm (frequency modulation) modulating signal to spread the spectrum of the generated emissions and reduce peaks, thus providing compliance with EMC regulations. The system disclosed here replaces the pseudo-random and similar fm drive signals with chaotic signals, produced by an algorithm that is described. The use of chaos-generated signals reduces the emissions of the drive (and motor), requires less filtering and can be developed by simpler circuits (as compared to pseudo-random generators). By analysis, simulation and experiment, a 15-20 dB reduction of the peaks in the power density spectrum is achieved.
Index terms: PWM motor controls, spread spectrum methods, chaos based drive signals, frequency modulation.

EMCABS: 03-02-2005
A PEEC-BASED METHODOLOGY AND A HYBRID CODE FOR THE ANALYSIS OF 3D IRREGULAR INTERCONNECTS
E. Vialardi +, ++ and G. Akoun +
+ Environmental Simulation and Computation Department, EADS CRC 12 rue Pasteur, 92152 Suresnes Cedex, France
++ Department of Electrical and Computer Engineering, INSA Toulouse 135 avenue de Rangueil, 31077 Toulouse Cedex 04, France
enrico.vialardi@eads.net, gilles.akoun@eads.net
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 1, pp.18-23
Abstract: Two methodologies for the modeling of 3D complex irregular structures are presented in this paper, with discussion of their performances and examples of their applications. The first one is based on the PEEC modeling technique in conjunction with a model order reduction method: the PRIMA algorithm, which is necessary for reducing the size of the problem and providing a passive equivalent circuit of the structure analyzable in reasonable time by a SPICE-like circuit simulator. The second methodology uses the so-called “frequency compression” to describe as a multiport the examined structure and the “time compression” to approximate, via Padé polynomials, the terms of the obtained matrix and to interpret it as an equivalent circuit. The two proposed modeling processes are applied to the time-domain analysis of an IEEE challenging delay line problem: the output voltage waveform of a serpentine-shaped trace is calculated and compared to the response of a straight line of the same length. Secondly, we compute in the frequency domain the impedance matrix characterizing a particular structure made of a holed ground plane and a four-legs stripline
crossing it in its middle by means of a via.
Index terms: 3D complex irregular structures, SPICE-like circuit simulator, IEEE challenging delay line problem.

EMCABS: 04-02-2005
UNCONDITIONALLY STABLE NUMERICAL MODELING AND BROADBAND OPTIMIZATION OF ARBITRARILY-SHAPED ANECHOIC AND REVERBERATING EMC CHAMBERS
N. V. Kantartzis and T. D. Tsiboukis
Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki GR-54124 Thessaloniki, Greece
tsibukis@auth.gr
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 1, pp.48-53
Abstract: A 3-D curvilinear alternating-direction implicit finite-difference time-domain (ADI-FDTD) algorithm for the unconditionally stable analysis and the optimal design of anechoic and reverberating chambers is presented. In this paper, the novel frequency-dependent method develops consistent non-standard forms, which suppress the serious dispersion errors of existing approaches and avoids prolonged simulations via time-steps significantly beyond the Courant limit. To model inherent grid intricacies, the proposed formulation introduces a low-pass filtering scheme with an efficient stencil procedure for dissimilar interfaces. Hence, wideband performance evaluations of critical chamber quantities are rapidly and accurately conducted, before the structure’s actual implementation. Numerical results confirm the prior merits through realistic test facilities and measurement arrangements.
Index terms: ADI-FDTD algorithm, anechoic and reverberating chambers, unconditionally stable analysis, optimal design.

EMCABS: 05-02-2005
A THEORETICAL APPROACH TO THE SENSITIVITY DIAGRAM OF A PRINTED DOUBLE-LOADED LOOP FOR NEAR FIELD MEASUREMENTS
Marcos Quílez, Andreu Atienza and Ferran Silva
Electromagnetic Compatibility Group (GCEM), Technical University of Catalonia (UPC), Campus Nord Edifici C4, Jordi Girona 1-3, 08790 Barcelona, Spain
marcos@eel.upc.es
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 1, pp.198-202
Abstract: Some works assume that a double-loaded loop behaves, in essence, like a dipole for the electric field and like a loop for the magnetic one. With that assumption, they study the behavior of the probe considering only the orientation, which provides the maximum response. In this article, we present how the theoretical response of the probe changes as a function of the direction of incidence and the orientation of the fields. We also suggest plotting this variation in diagrams that show the spatial variation of sensitivity more clearly than the patterns usually used with antennas. The diagrams we present can also be used to reformulate the spatial response in terms of near-field incidence, instead of using a formulation based on plane waves. Some measurements were done using a printed double loaded loop and the obtained values agreed with the calculated sensitivity diagram.
Index terms: Near field measurements, double-loaded loop, sensitivity diagram.

EMCABS: 06-02-2005
INVESTIGATION OF THE ELECTROMAGNETIC RADIATION FROM MOTHERBOARD-DAUGHTERBOARD STRUCTURES
M. Leone
Siemens AG, Corporate Technology 91050 Erlangen, Germany
marco.leone@siemens.com
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 1, pp.355-360
Abstract: Motherboard-daughterboard structures represent a source of unintentional electromagnetic emission, driven by small voltage differences, caused by the finite signal-return impedance in the connector. The presented model describes the radiation mechanism in terms of an antenna transfer function and the driving antenna voltage, which is determined by means of a partial-inductance equivalent circuit. This allows us to separate the influence of the board geometries from the influence of the signal parameters and the connector configuration. It is found that the total signal-path impedance and the pin length mostly determine the radiation level. The radiation-level reduction by ground pins is most effective when using only a small number, which is closely spaced to the signal pin. Validation is provided by computational examples and experimental results.
Index terms: Electromagnetic emission, motherboard-daughterboard structures, radiation mechanism, antenna transfer function, driving antenna voltage.

EMCABS: 07-02-2005
SIGNAL RADIATION AND TRANSMISSION PROPERTIES OF TWISTED WIRE PAIRS IN THE GHZ RANGE
G.Antonini +, A. Ciccomancini Scogna +, A.Orlandi +, and V.Ricchiuti ++
+ UAq EMC Laboratory, Department of Electrical Engineering, University of L’Aquila Poggio di Roio, I-67040, L’Aquila, Italy
++ C.N.X. S.p.A. – A Siemens Company Loc. Boschetto, I-67100, L’Aquila, Italy
antonini@ing.univaq.it, scogna@ing.univaq.it, orlandi@ing.univaq.it,
vittorio.ricchiuti@siemens.com
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 2, pp.564-569
Abstract: In system interconnection among very high bit rate telecommunication equipment, Twisted Wire Pairs (TWPs) are still a popular choice due to their superior immunity to external noise. TWPs are used to overcome problems due to crosstalk and radiated emissions. The paper deals with the analysis, in the GHz range, of the radiation and transmission properties of TWPs running above a reference plane. Special attention is paid to the properties of differential and common mode voltages and currents. TWP is characterized by a three dimensional full wave analysis and its capability of transmitting over GHz signal is verified.
Index terms: Twisted wire pairs, radiation and transmission, three-dimensional full wave analysis.

EMCABS: 08-02-2005
CALCULATION OF RADIATED FIELD FROM UTP CABLE AT HIGH FREQUENCY USING 4-PORT NETWORK MODEL
S. Fujiishi +, N. Kuwabara + and F. Amemiya ++
+ Faculty of Engineering, Kyushu Institute of Technology 1-1 Sensui-cho, Tobata-ku, Kitakyushu-shi, Fukuoka, 804-8550, Japan
++ EMC center, NTT Advanced Technology 3-9-11 Midori-cho, Musashino-shi, Tokyo, 180-0012 Japan
fujiishi@buddy.elcs.kyutech.ac.jp
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 2, pp.570-575
Abstract: Radiated electric field from unshielded twisted pair cable should be investigated to maintain EMC for the high-speed telecommunication system. However, the analysis in the frequency range of more than 300 MHz has not been carried out yet. In this paper, we investigate the analysis method of the radiated electric field greater than 300 MHz by expressing the balanced pair cable and telecommunication equipment by the 4-port networks. The 4-port network parameters of the cable with ground plane were determined from the presented paper. The telecommunication equipment was expressed by a balance-unbalance transformer, and the 4-port network parameters were determined from the measured S-parameters. The segment length of the cable was determined to obtain a sufficient converged solution. The calculation results were compared with the measured one. The results indicated that the tendency of the calculated results almost agreed with the measured one.
Index terms: Unshielded twisted pair cable, radiated electric field, high frequency analysis, 4-port network model.

EMCABS: 09-02-2005
PREDICTION AND EXPERIMENTAL VERIFICATION OF RADIATED FIELDS FROM INTERCONNECT CABLES DUE TO COMMON-MODE CURRENTS
X. L. Liu, D. W. P. Thomas and C. Christopoulos
George Green Institute for Electromagnetics Research, The University of Nottingham, Nottingham NG2 7DR, United Kingdom
Dave.Thomas@nottingham.ac.uk
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 2, pp.590-594
Abstract: Common-Mode (CM) currents on interconnect cables within a product are significant contributors to the overall radiated electromagnetic (EM) fields of that product. An equivalent circuit model to predict steady state common-mode currents on a pair of parallel interconnect cables above ground is presented in this paper. The predicted currents can be either segmented onto a number of infinitesimal dipoles along the line or decomposed into forward and backward wave components. The near and far fields are then calculated by either a Hertzian dipole approach or traveling wave method. The theoretical predictions are compared with the experimental measurements of the radiated fields from two parallel wires above ground. The experimental verification shows that such methods are more accurate than the previous widely used Common Prediction Model, which is valid only for electrically short lines. Furthermore, the computation is more rapid compared with a full numerical field solver.
Index terms: Interconnect cables, radiated fields, common-mode currents, equivalent circuit model.

EMCABS: 10-02-2005
EXPERIMENTAL ACTIVITY IN USING A REVERBERATION CHAMBER FOR EMISSION AND SHIELDING EFFECTIVENESS MEASUREMENTS: COMPARISON WITH TRADITIONAL DETERMINISTIC METHODS
D. Appicciutoli, G. Buoncompagni, V. and Mariani Primiani
Dipartimento di Elettromagnetismo e Bioingegneria Università Politecnica delle Marche Via Brecce Bianche – 60131 Ancona – Italy
valter.mariani@univpm.it
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 2, pp.717-722
Abstract: The paper concerns the comparison between reverberation chamber measurements (RC) and traditional deterministic measurement techniques; in particular, examples of emission and shielding effectiveness (SE) measurements are presented. The emission of a box with apertures, and an arbitrary source inside, is estimated by RC measurements and compared to those obtained on an OATS. Moreover, the SE of a braided shield coaxial cable and the SE of a metallic box with an aperture, covered by a metal loaded plastic material, are recovered in a reverberation chamber. In this case, the comparison is performed with other measurement techniques, the tri-axial and the absorbing clamp methods for the cable SE, and with a direct illumination free space measurement in the case of the SE of the metallic enclosure. In the emission case, the directivity choice is fundamental to predict the worst-case level, corresponding to a particular direction and polarization for the receiving antenna in the OATS. A similar situation occurs for the SE of the box, in the sense that the worst case, a particular direction and polarization of the incident wave, is hidden in the “mean” in the reverberation chamber.
Index terms: Emission and shielding effectiveness, reverberation chamber measurements, traditional deterministic methods, comparison.

EMCABS: 11-02-2005
AN INVESTIGATION INTO RADIATED SUSCEPTIBILITY OF IT NETWORKS
R. Hoad, N.J. Carter, D. Herke, S.P. Watkins, and A. Wraight
QinetiQ, Electromagnetic Compatibility Group, Building A5, Room 1005,Cody Technology Park, Ively Rd, Farnborough, Hants, GU14 0LX, United Kingdom
rhoad@qinetiq.com
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 2, pp.837-842
Abstract: Information Technology (IT) equipment and specifically Personal Computers (PCs) are an essential and integral part of our business and every day lives. Networks of computers are perhaps more at risk from upset or disruption from intentional or unintentional Electromagnetic Interference (EMI), than stand alone systems due to coupling routes via interconnecting cables. If the IT equipment is used in a security or safety critical application then upset or disruption is extremely undesirable. The susceptibility level of a COTS IT network and network components has been assessed using the mode stirred (reverberation) chamber technique. To this end a series of susceptibility tests were performed using an iterative approach. In this way, networking components were gradually added to a standalone PC to form a fully functional network. Results are provided which demonstrate the good repeatability of the method used and critical failure nodes of the network.
Index terms: Intentional EMI, Susceptibility, EMC.

EMCABS: 12-02-2005
ELECTROMAGETIC IMMUNITY: SYSTEM-VERSUS CHIP-LEVEL
Bernd Deutschmann+, Gunter Winkler++, Timm Ostermann+++ and Kurt Lamedschwandner++++
+ austriamicrosystems AG, Schloß Premstätten, A-8141 Unterpremstätten
++ Technische Universität Graz, Institut für Elektronik, A-8010 Graz
+++ Institut für integrierte Schaltungen, Universität Linz, A-4040 Linz
++++ ARC Seibersdorf Research GmbH, A-2444 Seibersdorf
bernd.deutschmann@austriamicrosystems.com, gunter.winkler@tugraz.at, oster@riic.at,
kurt.lamedschwandner@arcs.ac.at
Proceedings of the International Symposium on Electromagnetic Compatibility, Eindhoven, The Netherlands, September 6-10, 2004, Volume 2, pp.843-848
Abstract: The immunity of integrated circuits (ICs) to electromagnetic interference is an important issue in modern IC designs. Many years of characterizing the immunity of electronic systems and devices have lead to well-defined standards at the system-level. For the IC-level, new standards are currently under development. In this paper, one of the new immunity measurement methods at the IC-level (the direct power injection method) is compared to its corresponding measurement method at the system-level. The different measurement results, which have been obtained from the characterization of an IC and a simple electronic system using this IC, are correlated to figure out if it is possible to build a bridge between these two worlds.
Index terms: Integrated circuits, new immunity measurement methods, system versus chip level. EMC