EMCABS

WILLIAM H. McGINNIS ASSOCIATE EDITOR

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

EMCAB COMMITTEE
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

“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 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.

NUMERICAL MODELING OF MOBILE PHONE EQUIPMENT

R. Ehmann
CST Gmbh, Darmstadt, Germany
e-mail: ehmann@temf.tu-darmstadt.de
S.Gutschling, B.Trapp and T. Weiland
Darmstadt University of Technology, Darmstadt, Germany

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.334-338

Abstract: The influence of using a cellular phone inside a car on the radiated electromagnetic field is analyzed numerically. The specific absorption rate (SAR) inside the head and the antenna characteristics are considered for a simulation with and without car. For the computations, the Finite Integration Technique in time domain implemented in the Software Package MAFIA (Maxwells Finite Integration Algorithm) is used.

Index terms: cellular phone, SAR, antenna characteristics, simulation

MICROSTRIP ANTENNAS ON MULTILAYER DIELECTRIC FOR MOBILE SYSTEM COMMUNICATION

M.Wnul, W.Kolosowski and M.Amnowicz
Military University of Technology, Warsaw, Poland
e-mail: mwnuk@wel.wat.waw.pl

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.346-350

Abstract: Intensive development of cellular personal communication systems has been observed lately. Thus, protection of a man, and especially protection of his head against non-ionizing electromagnetic radiation generated by cellular telephones is becoming one of the most important problems. The results of elaborated microstrip antennas which have minimized radiation towards the user’s head are presented in this paper.

Index terms: cellular telephones, radiation protection, microstrip antennas

ENGINEERING MODEL FOR SHIELDING EFFECTIVENESS EVALUATION

V.Lenivenko
MITEC Ltd., Brisbane, Australia
M.Mostafa
Nokia Research Center, Tampere, Finland

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.300-305

Abstract: This paper presents results of the modeling of Shielding Effectiveness for modular type shielding enclosures of 3-m and 10-m EMC chambers. Propagation of electromagnetic waves inside and outside the shielding enclosure was analyzed. Engineering models based on the equivalent circuit approach and mode matching solution were employed. Results of the two approaches were compared with each other and with experimental data. Influence of structural configuration and mechanical tolerances on the overall Shielding Effectiveness of the chamber was studied based on the typical enclosure design. Frequency band from 1 to 20 GHz was taken under consideration though results might be applicable for other frequency bands as well.

Index terms: shielding enclosures, shielding effectiveness, analysis

EFFECTS OF ELECTROMAGNETIC INTERFERENCES ON OPERATIONAL AMPLIFIERS

J.Kolodziejski
Institute of Electron Tecnology, Warsaw, Poland
e-mail: jekolo@ite.waw.pl
M.Skorupski
Technical-Agriculture Academy, Bydgoszcz, Poland

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.522-526

Abstract: In the work some results of simulation and experimental investigations are given, concerning the susceptibility of operational amplifiers (OpAmps) to electromagnetic interferences (EMI). The effects of EMI, mainly hf (out-of-band) in the form of short pulses, on the inputs of OpAmps and on their power supply lines are considered. Conventional (voltage dependent) and current feedback amplifiers (FCAs) are taken into account. Final conclusions embrace some practical recommendations.

Index terms: operational amplifiers, EMI, simulation, experiment

HAZARD FOR ELECTRONIC SYSTEMS DUE TO EFFECTS OF LIGHTNING ELECTROMAGNETIC IMPULSES

C.Mazzetti
University of Rome, “La Sapienza”
Rome, Italy
Z.Flisowski and B.Kuca
Warsaw University of Technology, Warsaw, Poland

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.500-505

Abstract: The paper deals with a simplified method of the hazard assessment for electronic systems due to lightning electromagnetic impulses (LEMP). The main idea of the method is presented in which the immunity level of the considered system is to be correlated with the statistical distribution of overvoltages appearing inside the protected structure. On the basis of this correlation, the way for risk and frequency of possible damages of the system under consideration is discussed and evaluated.

Index terms: lightning EMP, hazard assessment, statistical analysis

THE OCCURRENCE OF TRANSIENT FIELDS AND ESD IN TYPICAL SELECTED AREAS

S.Frei
Berlin University of Technology, Berlin, Germany
e-mail: frei@ihs.ee.tu-berlin.de

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.486-490

Abstract: The occurrence rate of Electrostatic Discharges (ESD) depends extremely on the environment. Several parameters influence ESD and the severity of this interference. A special measurement system to measure the transient fields of ESD was designed. Measurements were done in different environments. A theoretical model was developed, helping to predict and to evaluate the severity level of an environment towards ESD.

Index terms: ESD, transient fields, measurement system

COMPUTER SIMULATION OF ESD FROM OBJECT WITH SURFACE
RESISTANCE

P.I.Shubitidze, R.Jobava and D.Karkashadze
Tbilisi State University, Tibilisi, Georgia
e-mail: lae@resonan.ge
D.Pommerenke, Hewlett Packard, Roseville, USA
R.Zaridze, Tbilisi State University, Tibilisi, Georgia

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.511-513

Abstract: Electrostatic discharge of the body with different surface resistance is investigated. Influence of the surface resistance on the current in the arc and on the radiated by the body fields is studied. The problem is formulated in the terms of surface integral equation for magnetic field. The equation is solved by the Method of Moments in time domain. Results are given for spheroid with different surface resistance. It is shown that for some kind of distribution of surface impedance, the level of radiation from electrostatic discharge can be reduced.

Index terms: ESD, object with surface resistance, computer simulation

ANALYSIS OF MICROWAVE ABSORPTION AND MATERIAL PROPERTIES OF M-TYPE HEXAGONAL FERRITES

H.Ota and M.Kimula, EMC Research Laboratories Co. Ltd., Sendai, Japan
R.Sato, Tohoku Gakuin University, Tagajo, Japan
K.Okayama and M.Honda, Tohoku University, Sendai, Japan

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.396-399

Abstract: The microwave absorption properties of M-type hexagonal ferrites are investigated. The complex permeability and permittivity were measured using a network analyzer. In the BaFe12-x(TiCo)xO19 system, the ferrimagnetic resonance frequency shifts down to the 1-20 GHz range, when x is increased. Due to the relatively high mu_r" value, thin matching thickness of 0.9-1.9 mm were obtained in the 5-10 GHz range. The frequency characteristics of mu_r’ and mu_r" were analyzed and simulated successfully using a parallel resonant circuit model based on the crystalline structure. Dual peak characteristics of mu_r" were observed for a certain sintering temperature and duration, and a relative absorption bandwidth of 16% was obtained. The simulation showed that a wider absorption bandwidth of 33% may be possible.

Index terms: M-type hexagonal ferrites, microwave absorption properties, measurement

SHIELDING OF THE DIELECTRIC BALL RESONATORS WITH WHISPERING-GALLERY MODES

S.Kharkovsky, Y.F.Fllipov, Z.E.Eremenko, V.V.Kutuzov and A.E.Kogut
National Academy of Sciences, Kharkov, Ukraine
e-mail: ire@ire.kharkov.ua

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.380-384

Abstract: New results of the investigation of shielded dielectric ball resonators (DBR) with whispering gallery modes (WGM’S) are represented. The characteristic relations TM and TE modes are obtained. The dependence of resonant frequencies Q-factor of WGM’S on resonator parameters have been calculated numerically. It is shown that the shielding of DBR provides the increasing modes Q-factor in ten times. A good agreement between theoretical and experimental results are obtained.

Index terms: shielded dielectric ball resonators, whispering gallery modes, theory, experiment

ELECTROMAGNETIC FIELD UNIFORMITY TEST USING MODULATED SCATTERING PROBES

R.Azaro
University of Genoza, Genoza
S.Caorsi
University of Pavia, Pavia, Italy

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.183-187

Abstract: The use of the Modulated Scattering Technique (MST) for electromagnetic field uniformity test is proposed. Measurement times associated with the conventional technique employing mechanical positioning of a single probe, are usually long. By using an array of modulated scattering probes, electronically driven, the technique allows a dramatic reduction in measurement time. In the paper, the theoretical basis of the technique is discussed, the prototype system is described and some measurement data is presented.

Index terms: field uniformity test, modulated scattering technique, prototype system

DEVELOPMENT OF FIELD PROBES PRINTED ON SUBSTRATES FOR DOSIMETRIC ASSESSMENTS IN THE FREQUENCY RANGE FROM 1 MHZ TO 18 GHZ

C.Probol and K.Gonshorek
Dresden University of Technology, Dresden, Germany
e-mail: probol@gmx.de

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.224-228

Abstract: The electric and magnetic fields in the proximity of strong sources of radiation (e.g. RADAR and broadcasting) can exceed the limits mentioned in the national standards for the exposition of persons. Several field probes have been developed to ensure that people working close to these sources of radiation will not be exposed to energy densities above the limit. However, many field probes have disadvantages in the everyday use by people that are not experienced in measuring electromagnetic fields.

Index terms: dosimetric assessments, field probes

TEM CELL VS. FREE SPACE: COMPARISON OF THE FIELDS INSIDE DIELECTRIC SPHERES

W.M.D‘Amico and R.Baselli, T
echnical University of Milano,
Milano, Italy
e-mail: damico@elet.polimi.it

Proceedings of 14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility, Wroclaw, Poland, June 23-25, 1998, pp.193-197

Abstract: The Crawford cell is a very convenient equipment for generating high intensity Transverse Electromagnetic fields; it has a straightforward design, and it is inexpensive to be built. Unfortunately, when an object is placed inside the cell, the field distribution can be significantly distorted. To date there is no definite answer on whether the (loaded) Crawford cell is a good approximation of (loaded) free space. In this work a typical Crawford cell is considered, properly designed to obtain a uniform TEM field when empty. A dielectric hemisphere is then assumed to be placed on the central conducting septum; this hemisphere is equivalent (for the images theorem) to a dielectric sphere in the free space. The field inside the dielectric hemispheres is numerically evaluated, using a 3DEM simulator; this field is then compared with that inside the corresponding sphere in free space, illuminated by a plane wave, for which the analytical solution is known. Comparisons are carried out at several frequencies, for (hemi)spheres of different sizes and refractive indices.

Index terms: Crawford cell, dielectric hemispheres, uniform TEM field, numerical evaluation

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