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.
SITE ATTENUATION CHARACTERISTICS OF FULLY ANECHOIC CHAMBER
USING FOAMED FERRITE AS NEW ABSORBING MATERIAL
Masamitsu Tokuda+, Kazuo Simada++ and Hiroshi Ishii++
Kyushu Institute of Technology
++Riken Eletech Corporation
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.181-184
Abstract: Fully anechoic chamber using a foamed ferrite as a new absorbing material, which thickness is only about 10 cm, has been developed. It is confirmed that the normalized site attenuation in free pace is within plus-minus 4dB to the theoretical value on the frequency range of 30 MHz to 18 GHz. It is revealed that the emission measurement in free space condition can be realized in a small space.
Index terms: Fully anechoic chamber, foamed ferrites, site attenuation, emission measurement.
PRODUCTION METHODS AND CHARACTERISTICS OF FOAMED FERRITE AS NEW
ABSORBING MATERIAL OF ANECHOIC CHAMBER
Toshikastu Hayashi, Sigeo Inoue, Yukio Nakanouchi,
Kazuo Simada, Hiroyosi Ishii and Masamitsu Tokuda,
Riken Corporation, Rikenelectech Corporation
Kyushu Institute of Technology
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.189-192
Abstract: In this study, we proposed a wide frequency range RF absorber which shows superior absorbing characteristics at the microwave band, by means of combining ferrite tile absorbers with RF absorbers made of pyramidally foamed, formed and sintered ferrite powders. In the new absorber, while the absorbing property of the ferrite tile absorber at a low frequency range is maintained, an absorbing property of 20 dB or over at a high frequency range up to 10 GHz is achieved. The height of the pyramid of the new absorber is only 10 cm, which is advantageous for use in anechoic chambers. In addition, when a carbon pyramidal absorber approximately 30 cm high is added, the absorber can be used even at a higher frequency range; it showed an absorbing property of 30 dB or over at 1 GHz - 20 Ghz.
Index terms: Anechoic chamber, RF absorber, foamed ferrites, production method, absorbing properties.
EXPERIMENTAL ANALYSIS ON ELF MAGNETIC FIELD ATTENUATION OF
SHIELDED CYLINDERS
Yeon-Choon Chung, Byung-Chil Woo and Min-Su Choi
Electromagnetic Metrology Div., Korea Res. Inst. of Std. & Sci.
Jong-Hwa Kwon and Dong-Chul Park
Dept. of Radio Sci. & Eng., Chungnam National Univ.
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.193-196
Abstract: The construction of magnetic shielding measurement system and the experimental analysis of magnetic field attenuation of the shielded cylinders are presented. Measurement system was constructed using a Helmholtz coil system in accordance with ASTM-A698M-92. Generated field uniformity was less than 5% within 403 cm3 volume, and magnetic shielding effectiveness of less than 50 dB can be measured in the frequency range up to 10 kHz. The variation of magnetic shielding effectiveness was investigated by changing the magnetic flux density, test frequency, and physical size of the shielded cylinder made with 3% SiFe and magnetic amorphous ribbon.
Index terms: Magnetic shielding, ELF, Helmholtz coil system, shielding effectiveness, experiment.
SHIELDING EFFECT OF POROUS CARBON MATERIAL “WOOD
CERAMICS”
Yukio Hotta, Mitsuharu Sato and Hitoshi Togawa,
Tokin Corporation,
Shuichi Nitta,
Tokyo University of Agriculture and Technology
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.197-200
Abstract: The measured results of electromagnetic shielding effect of porous carbon material wood ceramics, which is currently being studied for practical commodity application, are discussed. The electromagnetic shielding effect or permittivity vs frequency characteristics for different sintering temperatures are studied and it is found that wood ceramics permittivity increases as sintering temperature becomes high. This means that conductivity of high-temperature sintered wood ceramics is getting low. In this paper, electromagnetic shielding effect of wood ceramics sintered at 800 Centigrade against near field and far field are studied. To obtain the shielding effect at near field and far field, ADVANTEST method and TEM cell method are used respectively.
Index terms: Wood ceramics, electromagnetic shielding effect, measurement.
ALTERATIONS OF SEMI-ANECHOIC CHAMBER TO REALIZE THE FREE
SPACE CONDITION
+Yoshinobu Hayashi, Takashi Shinozuka and Risaburo Sato
Electromagnetic Compatibility Research Laboratories Co., Ltd.
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.201-204
Abstract: Free space condition is required of test site at EMI measurement above 1 GHz. The users of semi-anechoic chambers currently used below 1 GHz take notice of the applicability to use them above 1 GHz. We measured conventional chamber of 3 m and 10 m method and investigated the requirements to realize free space condition, for example the requirement of covering the floor with electromagnetic absorbers in the range from 1 GHz to 6 GHz. We already reported the evaluated result by height pattern measurement. This time, we measured the horizontal distance characteristics of the electromagnetic field strength, compared them with theoretical values of characteristics. In the result, it was found that free space condition is satisfied within an accuracy of 3 dB for both horizontal and vertical polarization in a chamber of 3 m method with considerations for around the receiving antenna. It was also found that this result was same as result of height pattern measurement.
Index terms: EMI measurement, semi-anechoic chamber, horizontal distance characteristics, free space condition.
ELECTROMAGNETIC SCATTERING CHARACTERISTICS OF CONCRETE BUILDINGS
IN MOBILE RADIO WAVE PROPAGATION CHANNEL
Yasumitsu Miyazaki+ and Paul Selormey
Toyohashi University of Technology
Department of Information and Computer Sciences
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.205-208
Abstract: Detailed characterization of radio propagation channel is a major requirement for successful design of mobile communication systems. In this paper, mobile radio channel characterization process based on the FDTD method is presented. The merits and demerits of the currently used methods, namely impulse-response method and ray-tracing methods are briefly considered, and the total field formulation of the FDTD method is discussed.
Index terms: Mobile communication systems, concrete building, electromagnetic scattering, FDTD simulation.
SHIELDING PERFORMANCE EVALUATION OF TWO IMAGE
PLANES CONFIGURATION
J.S. Kim, H.J. Lee, and N. Kim
+Electronics and Telecommunications Research Institute
++Chungbuk University
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.209-212
Abstract: The use of image planes is an effective method to reduce the radiated emissions from a printed circuit board(PCB). This paper deals with the influence of image planes on the radiation from PCB. The shielding performance of multi-layers of image planes of finite width and length is analyzed by the method of moments based on the triangular surface patch model. It is demonstrated that proper triangulation should be made so as to take two basis functions in the boundary triangles of the surface.
Index terms: Printed circuit board, radiated emission, shielding performance, method of moment.
EFFECTS OF FERRITE SHEET ATTACHED TO PORTABLE TELEPHONE ON
SPATIAL PEAK SAR REDUCTION
+Jianqing Wang and Osamu Fujiwara
Department of Electrical and Computer Engineering, Nagoya Institute of Technology
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.213-216
Abstract: Although the authors have previously proposed a ferrite sheet attached to a portable telephone to reduce the spatial peak specific absorption rate (SAR) in the human head, the dependence of material properties of ferrite sheet on the SAR reduction effects is still unclear. In this paper, a quantitative relationship between the complex permeability of ferrite sheet and the reduction effect of spatial peak SAR is derived through the finite-difference time-domain (FDTD) analysis. It is found that the SAR reduction effect increases with increasing of the real part of the complex permeability and decreasing of the imaginary part. A maximum reduction of spatial peak SAR may exceed 30% at 900 MHz, and no degradations in the maximum antenna radiation directions are observed for both the horizontal and vertical planes. Moreover, the antenna radiation efficiency increases slightly when is large because the decreased quantity of the power absorbed by the human head is larger than that dissipated and reflected by the ferrite sheet.
Index terms: Portable telephone, spatial SAR, ferrite sheet attachment, SAR reduction effect, FDTD analysis.
CALCULATION OF HIGHER ORDER MODE CUTOFF FREQUENCIES IN 50 OHM
ASYMMETRIC TEM CELLS BY GALERKIN METHOD
J.H. Yun, K.Y. Cho and H.J. Lee
Electronics and Telecommunications Research Institute
J.K. Kim
Department of Electronics Engineering, Chungang University
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.217- 220
Abstract: The authors propose the half mode boundaries to solve not only the higher order mode cutoff frequencies of symmetric TEM cells but also those of asymmetric TEM cells. It is shown that the measured resonant frequencies of a designed asymmetric TEM cell agreed well with the predicted results by the Galerkin method (GM).
Index terms: Crawford’s TEM cells, higher order mode cutoff frequencies, Galerkin method, calculation, measurement.
LONG-TERM TEST RESULTS OF ELECTROMAGNETIC INTERFERENCE FROM A
765 KV TEST LINE
Hee-Sung Ahn, Sung-Ho Myoung, and Kwang-Ho Yang
Korea Electrotechnology Research Institute
Jeong-Boo Kim, Dong-Il Lee,and Koo-Yong Shin
Korea Electric Power Research Institute,
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.225-230
Abstract: This paper presents the results of long-term electromagnetic interference measurements (EMI) on one of the first conductor bundle tested at the Kochang 765 kV Project. The instrumentation and the facilities are also described in brief. This test line can be energized at line voltages up to 830 kV line-to-line. The measurements described in this paper were conducted on a bundle of 6 x 3.04 cm diameter conductors (Cardinal). The analysis of the data shows that the 6-Cardinal conductor bundle meets the radio and television interference guidelines of the Korea Electric Power Corporation (KEPCO).
Index terms: EMI, radio interference, television interference, test line, corona, extra high voltage
RESPONSES OF SPECTRUM ANALYZERS TO PULSIVE AND GAUSSIAN NOISE
INPUTS
Yukiko Yamanaka and Akira Sugiura
Communications Research Labolatory, Ministry of Posts and Telecommunications, Japan
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.239-242
Abstract: Three different spectrum analyzers currently available were investigated with special interest in their IF frequency selectivities, impulse responses, and Gaussian noise responses. It was concluded that, due to the variation in the frequency selectivities, disagreement arose over EMI measurement results obtained with different spectrum analyzers. The maximum differences in the impulse and Gaussian responses of various analyzers were observed to reach 6.4 dB and 3.5 dB respectively, when the analyzers were adjusted for a nominal RBW of 1 MHz. Frequency selectivities such as 6-dB band width should be standardized clearly in order to measure EM disturbance with good accuracy and reproducibility.
Index terms: EMI measurement, spectrum analyzer, impulsive/gausian noise response, measurement.
EVALUATION OF UNCERTAINTY FOR SITE ATTENUATION MEASUREMENTS
Akira Sugiura+, Kunimasa Koike, Akira Ohtani, and Hiroshi Masuzawa
Communications Research Laboratory, MPT
Proceedings of 1998 Korea-Japan AP/EMC/EMT Joint Conference, Pusan, Korea, September 3-5,
1998, pp.247-250
Abstract: This paper briefly reviewed recent CISPR activities related to the validation of a test site used for EMI antenna calibration. Following the CISPR draft specification, site attenuation was measured at a CRL site, which proved excellent agreement between experimental and theoretical values. In addition, various uncertainty components associated with the above measurement were analyzed using the moment method. The expanded total uncertainty varies widely depending on the frequency, but it was estimated to be max. 0.33 dB, as listed in Table 3.
Index terms: EMI antenna calibration, test site validation, site attenuation measurement, uncertainty.