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
Osamu Fujiwara
Associate Editor
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.
EMCABS: 01-11-99
ANALYSIS OF SHIELDED TENTS AND OTHER ELECTRICALLY THIN
SHIELDED ROOMS
Lothar O. Hoeft+ and Carl Wiggins++
+ Consultant, Electromagnetic Effects, Albuquerque, NM 87112, USA
++TRW, Inc., Albuquerque, NM 87110, USA
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 60-64
Abstract: An analysis of a large shielded tent or enclosure with electrically thin walls showed that three frequency ranges for a single shield increases at the rate of 20dB/decade and depends on the surface resistivity and enclosure size. At mid frequencies, the shielding effectiveness is frequency independent and depends on the surface resistivity. At high frequencies, the standing waves inside the enclosure become apparent and the shielding effectiveness of a single shield on a large facility can be in the range of 60 to 85 dB for frequencies above a few hundred kHz. A shielded floor is essential if significant shielding was required.
Index terms: Shielding, shielded tent, enclosure, thin shielded room.
EMCABS: 02-11-99
SLOT AND APERTURE COUPLING FOR AIRFLOW APERTURE ARRAYS IN
SHIELDING ENCLOSURE DESIGNS
M. Li, J. L. Drewniak, T. H. Hubing, R. E. DuBroff, T. P. VanDoren
University of Missouri-Rolla, Rolla, MO 65409, USA
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 35-39
Abstract: The coupling between apertures or slots in airflow arrays is investigated numerically by means of the method of moments (MoM). Application to shielding enclosure design is of particular interest. Justification for a previously extracted simple empirical design approach for the relation between the number N and size a of apertures, and the shielding effectiveness up to ~ Na3 for an airflow aperture array is given. The coupling between slots is also investigated. The application limit of the empirical design approach is demonstrated.
Index terms: Shielding enclosure, slot coupling, airflow array, method of moments.
EMCABS: 03-11-99
MODELING OF THE GROUND BOUNCE EFFECT ON PCBS FOR HIGH SPEED
DIGITAL CIRCUITS
S. W. Leung, Lixi Wan and C. M. Ip
City University of Hong Kong, Hong Kong
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 110-115
Abstract: A Generalized Transmission Line Equation (GTLE) is modeled for studying the effect of Ground Bounce (GB) in high-speed digital circuits. The trace/ground configuration is modeled by a “local wave” concept. The GB effect is characterized in this modeling as a function of various PCB parameters, and simulation results confirm that GB is induced because of the resonant behavior.
Index terms: Print circuit board, ground bounce, generalized transmission line equation, computer modeling.
EMCABS: 04-11-99
EXPERIMENTAL ANALYSIS OF COMMON-MODE CURRENTS ON FIBRE
CHANNEL CABLE SHIELDS DUE TO SKEW IMBALANCE OF DIFFERENTIAL
SIGNALS OPERATING AT 1.0625 Gb/s
James L. Knighten+, Norman W. Smith+, Joseph T. DiBene II++, and Lothar O. Hoeft+++
+ NCR Corporation, San Diego, CA 92127, USA
++ Convergence Design, San Diego, CA 92131, USA
+++ Consultant, Electromagnetic Effects, Albuquerque, NM 87112, USA
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 195-200
Abstract: The spectral nature of common mode currents induced on high speed differential cables operating at 1.0625 Gb/s was investigated using specially constructed shielded test boards. The source test board provided a source with a selectable amount of delay skew. The load test board provided a simple 150 Ohm differential load. The two boards were placed in separate shielded enclosures with a one meter Fibre Channel cable connecting them. Common-mode cable shield current and radiated emissions at 3 meters were measured as a function of delay skew. At the fundamental frequency of 531.25 MHz, common-mode current and radiated emission increased at a rate of approximately 9 dB/decade of skew. At skew values much lower than the rise time of the signal, common-mode current increased nearly linearly with skew. The second harmonic was present on the cable shield due to duty cycle distortion and rise and fall time differences inherent in the driver transceiver.
Index terms: Coupling, fibre channel, cable shield, skew imbalance, common-mode current, radiated emission.
EMCABS: 05-11-99
CHARACTERIZATION OF LARGE TEM CELLS AND THEIR INTERACTION WITH
LARGE DUT FOR VEHICLE IMMUNITY TESTING AND ANTENNA FACTOR
DETERMINATION
Ronald L. Monahan, Terry M. North, Andrew Z. Xiong
DaimlerChrysler Corporation, Auburn Hills, MI 48326, USA
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 245-249
Abstract: Transverse Electromagnetic Mode (TEM) cell testing of vehicles using a practical sized cell necessitates accommodation of a test object, the vehicle under test (DUT), higher than one third of the floor to septum height. Testing may be for immunity or for the determination of the vehicle’s antenna factor in the 150 kHz to 6 MHz frequency range. For this frequency range the environmental E-field is vertically polarized as is the TEM cell field, therefore the TEM cell should be useful for vehicle antenna factor measurements. A method is presented for overcoming the one third height “rule-of-thumb” for TEM cells which allows useful antenna factor measurements and an estimation of the field the vehicle is subjected to in immunity tests. The DUT causes an impedance discontinuity and the estimation of the corrected field strength, based on the decrease of the “free space” between the septum and the enclosure, is evaluated.
Index terms: TEM cell, vehicle immunity test, antenna factor, impedance discontinuity.
EMCABS: 06-11-99
MEASUREMENT OF CONDUCTED EMISSION - POSSIBLE SOURCES FOR MEASUREMENT UNCERTAINTIES
H. Krattenmacher and A. Schwab
University of Karlsruhe, 76128 Karlsruhe, Germany
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 370-375
Abstract: This paper presents results of investigations of the test setup for conducted emission measurements in the frequency range from 150 kHz to 30 MHz according to CISPR 14: 1993 and EN 55014: 1993, respectively. It is addressed to EMC test engineers to give them an idea how slight variations in the test setup can affect the measurement results and increase the measurement uncertainty. The investigations were performed by using a real EUT, namely a gas heating device with a repetitive ignition unit which produces broadband disturbances. Furthermore, a comparison of a Type A and Type B evaluation of the measurement uncertainty is presented. The obtained results confirm that the human factor as well as some degrees of freedom in the standards are sources of measurement uncertainty.
Index terms: Conducted emission, measurement uncertainty, ignition, human factor.
EMCABS: 07-11-99
THE MYTHOLOGY OF GROUND BOUNCE
Robert G. Kaires
Tektronix, Inc.
Beaverton, OR 97077, USA
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 405-410
Abstract: The concepts of “ground bounce” or “noisy reference planes” or “voltage drops along ground” are all tied in with the idea that a ground plane (or just a length of wire for that matter) can be modeled as an equivalent lumped inductor. If care is taken to consider the entire circuit, and mutual inductances are properly taken into account, this inductor model works. However, it appears that this model is often interpreted too literally. One notices that in the literature, authors often refer to “voltage drops” along ground. Some even purport to be able to measure this voltage. Others claim that this voltage can be used to drive antenna elements. In this paper we show that this voltage is fiction. The above inductor model is valid only when measuring a voltage from well-defined model “terminals” or “ports”. Misuse of the model can lead to erroneous conclusions.
Index terms: System EMC analysis, ground bounce, voltage drop, inductor model.
EMCABS: 08-11-99
WAVELET-BASED ADAPTIVE SIMULATION OF NONUNIFORM INTERCONNECTS WITH ARBITRARY LOADS
S. Grivet-Talocia and F. Canavero
Politecnico di Torino, I-10129, Torino, Italy
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 450-455
Abstract: This paper presents a wavelet-based adaptive discretization of the non-uniform multiconductor transmission lines. The resulting numerical scheme allows time-domain transient simulations of practical interest structures loaded with arbitrary dynamic and nonlinear termination networks. The advantage of the wavelet discretization is the usage of very few automatically determined unknowns for the computation of the solution at each time step. The adaptivity of the discretization does not affect the overall accuracy, which is the same as if a uniformly fine grid were used. The proposed scheme offers an optimized alternative to the more standard finite-difference (FDTD) approach for signal integrity analysis of interconnects.
Index terms: Time domain modeling, non-uniform multiconductor transmission line, interconnector, wavelet discretization.
EMCABS: 09-11-99
LIGHTNING RADIATED ELECTRIC FIELDS AND THEIR CONTRIBUTION TO INDUCED VOLTAGES
M. G. Sorwar and I. G. Gosling
Nanyang Technological University, Singapore 639798
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 635-639Abstract: During
the return stroke, the radiated electric field from a lightning channel contains vertical
and horizontal components of electric fields, which are both responsible for producing
transients in power lines, telecommunication lines, and electronic circuitry of
communication and control systems. This paper analyses the characteristics of the vertical
and horizontal components of electric field depending on different parametric conditions
of the return stroke. Lightning induced voltages on an overhead telecommunication line are
also calculated for different elemental fields. The numerical results show that horizontal
electric field (HEF) produces high ringing of fields at distances far from the strike
point, and plays an important role in producing induced voltages in the vicinity of the
lightning channel. The radiation and the induction components of fields are found to be
responsible for the change in polarity of induced voltages.Index terms: Lightning,
lightning radiation, return stroke, overhead line.
EMCABS: 10-11-99
SOLUTION OF A COMPLEX VIA-PIN CONNECTOR PROBLEM USING THE
PARTIAL ELEMENT EQUIVALENT CIRCUIT (PEEC) METHOD
Albert E. Rurhli and George Papadopoulos
IBM Research Division, NY 10598, USA
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 673-678
Abstract: The complexity of realistic geometries for EMI simulation problems is increasing steadily as the clock frequencies and the speed of the electronic systems increase. Especially the increase in the clock rate for high-end servers and workstations requires a careful analysis of all parts of a computer package. In this paper we analyze a structure which involves multiple pin connections for a high-speed package. The problem involves the electrical properties of connecting pins in the presence of multiple ground pins. The problem is solved with an experimental program based on the Partial Element Equivalent Circuit (PEEC) method. This circuit-oriented solution is ideally suited for this case. We solve the electromagnetic problem in the presence of several conventional circuit elements.
Index terms: EMI simulation, multiple pins, via connector, partial element equivalent circuit method.
EMCABS: 11-11-99
SUPPRESSION OF RADIATED EMISSION FROM AN 8-BIT MICRO-CONTROLLER
USING GATE-OXIDE FILTERING CAPACITORS
Hyungsoo Kim, Jonghoon Kim, Woonghwan Ryu, Myunghee
Sung, Seungyoung Ahn and Joungho Kim
Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 811-815
Abstract: The voltage fluctuations of the power/ground lines on IC’s, packages, and modules have become the major source of the radiated emission. Combined suppression techniques including shielding, cabling and filtering at the package level and the module level are not enough for the complete suppression of radiated emission. Moreover, the power/ground line fluctuations and the resulted radiated emissions caused by the IC surge current must be controlled and considered at the IC design procedure. We have demonstrated more than 10-dB suppression of the radiated emission from a commercial 80bit micro-controller using on-chip gate oxide filtering capacitors. The filtering capacitors are placed under the power/ground buses and the signal buses without ever increasing the die size.
Index terms: Interference suppression, radiated emission, gate oxide filtering capacitor, micro-controller.
EMCABS: 12-11-99
SUPPRESSION EFFECTS OF ELECTROMAGNETIC RADIATION FROM
INNER-LEAD PORTION MODELED BY FERRITE-RESIN COMPOSITE
Tadaharu Akino, Yasuhiro Ono, Shinichi Shinohara and Risaburo Sato
Electromagnetic Compatibility Research Laboratories Co., Ltd., Sendai 989-3204, Japan
Record of 1999 IEEE EMC Symposium, Seattle, USA, August 2-6, pp. 1010-1015
Abstract: This paper describes the suppression effects of electromagnetic waves radiating from the inner-lead portion of lead terminals molded by ferrite-resin composite in semiconductor devices. First, using composites in molded cylindrical form having various ferrite power content, the complex relative permeability and complex relative permittivity were measured using the Nicolson-Ross, Weir method. Next, the impedance of the inner-lead portion of lead terminal specimens, molded by the same ferrite-resin composite, was measured. Following this, each of the lead terminal specimens was mounted on a printed wiring board settled to a shield box, and electromagnetic radiation from the inner-lead was measured in an anechoic chamber, while terminating one end of the lead terminal to 50 ohms resistor and feeding a high frequency signal through the other end. The results of these experiments showed that electromagnetic radiation from the inner-lead portion can be effectively suppressed by molding the lead terminal by ferrite-resin composite having a ferrite powder content of 80 weight-% or greater.
Index terms: Radiation suppression, ferrite-resin, ferrite powder, inner-lead of semiconductor device.