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: 01-8-2005
ANALYTICAL STUDY ON CHANGE OF TEMPERATURE AND ABSORPTION CHARACTERISTICS OF SINGLE-LAYER TYPE RESINOUS WAVE ABSORBER TO RADIATED ELECTRIC POWER
+Masanori Kato, +Osamu Hashimoto, ++Takayuki Nakamura and ++Yoshio Nikawa
+ College of Science and Engineering, Aoyama Gakuin University, Sagamihara-shi, 229-8558 Japan
++ Faculty of Engineering, Kokushikan University, Tokyo, 154-8515 Japan
The IEICE Transactions on Communications (Japanese Edition), Vol.J86-B No.10, 2003, pp.2182-2188.
Abstract: In this paper, the complex permittivity of an epoxy resinous material is measured by changing temperature. The temperature distribution of a single-layer type wave absorber is analyzed with FDTD-HTE method using the measured complex permittivity, and then the temperature change of the absorber to the radiated electric power is calculated. As a result, it is observed that the temperature in the wave absorber rises rapidly, so that the radiated electric power is high, and that the temperature of the absorber rises to 170°C, after 120 minutes under the radiated electric power with 1000W/m2. It can be seen that the absorption characteristics of the absorber are rapidly changed when the absorption characteristics are calculated under the use of the analytical result above.
Index terms: Cavity resonator, measurement of complex permittivity, wave absorber, absorption characteristics, FDTD-HTE method.

EMCABS: 02-8-2005
ELECTRIC CHARACTERISTICS OF A DIPOLE NEAR A BOUNDARY OF TWO MEDIA
+Takashi Nakamura, +Kenji Ogawa and ++Risaburo Sato
+ Faculty of Engineering, Gifu University, Gifu-shi, 501-1193, Japan
++ Sendai Electromagnetic Compatibility Research Center, Sendai-shi, 989-3204 Japan
The IEICE Transactions on Communications (Japanese Edition), Vol.J86-B No.10, 2003, pp.2189-2195.
Abstract: In this paper, a dipole near a boundary of two lossless media is studied. Using the FDTD method, we obtain an equivalent permittivity of the uniform medium in agreement with frequency characteristics of the input admittance of the antenna. As a result, it is shown that the equivalent permittivity becomes a complex number, and changes with the distance between the dipole and the boundary. In particular, the equivalent permittivity drops rapidly when the dipole separates from the boundary in the medium of lower permittivity. The asymmetric electric characteristics of the boundary have been clarified. Also, an experiment is carried out. The input admittance of a monopole near the boundary of air and clay of adequate size is measured. Experimental results are compared and examined with calculated results, and the validity of this paper is clarified.
Index terms: Medium boundary, dipole antenna, FDTD method, equivalent permittivity.

EMCABS: 03-8-2005
DEVELOPMENT OF CIRCULAR PATCH TYPE ELECTRIC FIELD SENSOR FOR PRINTED CIRCUITS
+Satoru Kurokawa and ++Toru Sato
+ National Institute of Advanced Industrial Science and Technology, Tsukuba-shi, 305-8568 Japan
++ Graduate School of Informatics, Kyoto University, Kyoto-shi, 606-8501 Japan
satoru-kurokawa@aist.go.jp
The IEICE Transactions on Communications (Japanese Edition), Vol.J86-B No.11, 2003, pp.2380-2389.
Abstract: We developed a small sensor consisting of a microstrip-patch antenna suitable for measurements of propagating signals on a printed circuit. This sensor is the first one which is capable of measuring the dominant vertical electric field on/near the microstrip line. It can measure the signal on the microstrip line with sensitivity variations of less than 4dB over the frequency range of 1-10 GHz. In this paper, we examine the physical property of the sensor by using FDTD method, optimize its shape, and confirm the characteristics by actual measurements of a sample. The proposed sensor may be used for an even higher frequency range by properly choosing the permittivity and physical size of the board because it does not require a balun transformer which limits the frequency bandwidth.
Index terms: FDTD method, patch type antenna, microstrip line, electromagnetic field sensor.

EMCABS: 04-8-2005
FDTD SIMULATION OF ELECTROSTATIC DISCHARGE CURRENT BY ESD TESTING
+Osamu Fujiwara, +Xiaojiang Zhang and ++Yukio Yamanaka
+ Faculty of Engineering, Nagoya Institute of Technology, Nagoya-shi, 466-8555 Japan
++ Independent Administrative Institution, Communications Research Laboratory, Yokosuka-shi, 239-0847 Japan
fujiwara@odin.elcom.nitech.ac.jp
The IEICE Transactions on Communications (Japanese Edition), Vol.J86-B No.11, 2003, pp.2390-2396.
Abstract: ESD (ElectroStatic Discharge) testing is becoming an essential item to electronic and information equipment. In consideration of effective ESD counter-measures in the early design stage of the above products, a simulation technique for the ESD testing is desired as a useful and powerful tool. In this paper, we proposed a finite-difference time-domain (FDTD) modeling of an ESD-gun for the contact discharge being prescribed in the IEC61000-4-2. Using this modeling, we simulated the discharge current injected in the contact discharge to a 50W SMA connector. As a result, we found that the FDTD simulation approximately agreed with the measured result. We then applied the proposed modeling to a transmission line structure, and compared the simulated discharge voltage induced across the termination load with the measured one. Good agreement between them was found, which demonstrated the effectiveness of the FDTD modeling proposed here.
Index terms: ESD, ESD-gun, discharge current, FDTD modeling.

EMCABS: 05-8-2005
DISTANCE CHARACTERISTICS OF MAGNETIC SHIELDING EFFECTIVENESS OF SHIELDING PLATE NEAR MAGNETIC HERTZ DIPOLE
+Takahiro Hayashi, ++Koji Komiyama, ++Takehiro Morioka, +++Motoo Mizusawa, ++++Takashi Yamaguchi and +++++Yoshifumi Amemiya
+ Department of Electrical and Computer Engineering, Kanazawa Technical College, Kanazawa-shi, 921-8601 Japan
++ National Institute of Advanced Industrial Science and Technology, Tsukuba-shi, 305-3568 Japan
+++ Division of Electrical Engineering , Kanazawa Institute of Technology, Ishikawa-ken, 921-8501 Japan
++++ Engineering Foundations Education Center, Kanazawa Institute of Technology, Ishikawa-ken, 921-8501 Japan
+++++ 2-27 Miyoshi-cho, Fuchu-shi, 183-0045 Japan
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.2, 2004, pp.213-225.
Abstract: Magnetic field strength is inversely proportional to the third power of the near-field distance from its source; for example, a perpendicular and parallel magnetic Hertz dipole. The magnetic field strength is also inversely proportional to the fourth power of the distance from the source through a shielding plate. Therefore, magnetic shielding effectiveness is proportional to the distance from the magnetic source in the near region. These characteristics can be explicitly shown by a formula (deduced with some approximation) as the authors have previously reported. Experiments were performed to confirm the power exponents of distance in the approximated formulas, etc. In this paper, the distance characteristics of the magnetic shielding effectiveness are reported with a shielding plate near perpendicular and parallel to magnetic Hertz dipoles. Circular shielding plates with finite radii were used for the measurements instead of an infinitely large shielding plate. The radii were evaluated by considering the distribution of the surface currents on the plates and a suitable radius was determined for the shielding plate, which is assumed to have approximately the same shielding effect as an infinitely large plate. The performance of the plate was confirmed by experiments. Measured values of the power exponents for shielding effectiveness using the round plates are compared with the calculated values by the approximate formulas. The experimental results using the round shielding plate have shown that the characteristics of the magnetic shielding effectiveness are power functions of the distance and that the measured values of the exponents agree closely with theoretically derived values.
Index terms: Near-field shielding effectiveness, magnetic Hertz dipole, small loop antenna, Huygens-Fresnel’s principle.

EMCABS: 06-8-2005
CONDITIONS FOR ESTIMATING RADIATED EMISSION SOURCES ON ELECTRIC EQUIPMENT USING ONLY AMPLITUDE DATA
+Hiroshi Terashi, +Ken Tanaka, ++Yasuhiro Ishida, +++Masamitsu Tokuda and +Nobuo Kuwabara
+ Department of Electrical Engineering, Kyushu Institute of Technology, Kitakyushu-shi, 804-8550 Japan
++ Fukuoka Industrial Technology Center, Kitakyushu-shi, 807-0831 Japan
+++ Department of Electronics and Communication Engineering, Musashi Institute of Technology, Tokyo, 158-8557 Japan
kuwabara.nobuo@buddy.elcs.kyutech.ac.jp
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.2, 2004, pp.226-234.
Abstract: The method of finding a radiated emission source has been studied to apply the countermeasures for reducing the emission. The method using only amplitude data is useful because we can use the measurement facilities for emission. However, the method has not been applied to actual equipment where the source position cannot be estimated in advance. In this paper, we study how to apply this method to actual equipment. First, the source positions and their Norm were calculated by different initial values that were given randomly, and the balance position weighted with Norm was calculated as the emission source position. Next, the conditions achieving a steady solution were investigated using imitated equipment whose radiated electric field could be calculated by the method of moment. Finally, the conditions were applied to estimate the emission source position of a personal computer. The results indicated that the influence of the source at the estimated position is the largest to the electric field at 3 m distance.
Index terms: Radiated emission, amplitude data, imitated equipment, estimation condition, actual equipment.

EMCABS: 07-8-2005
IMPROVEMENT OF FREQUENCY EXTRACTION ACCURACY OF LINEAR PREDICTIVE ANALYSIS BY A COMBINATION OF AUTO-CORRELATION AND INTEGRAL PROCEDURE FOR NOISE WAVE SHAPE
+Kazuo Murakawa, +Fumihiko Ishiyama, +Hiroshi Yamane and ++Mitsuo Hattori
+ NTT Energy and Environment Systems Laboratories, NTT Corporation, Musashino-shi, 180-8585 Japan
++ NTT Advanced Technology Corporation, Musashino-shi, 180-8585 Japan
murakawa.kazuo@lab.ntt.co.jp
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.2, 2004, pp.235-245.
Abstract: This paper proposes a method of improving frequency extraction accuracy of linear predictive analysis by a combination of an auto-correlation and an integral procedure for noise wave shape. It is necessary to improve frequency extraction accuracy for mains power frequency to radio frequency from EMC mitigation view points. In this paper, the auto-correlation technique is used to reduce white noise effects on frequency extraction, and the integral procedure aims to emphasize the low frequency spectrum of noise. Our proposed method is introduced and examined by numerical simulations and experiments. The errors between the estimated frequency and a given frequency for simulations are 10-15%. These errors are much smaller than those for the conventional method.
Index terms: Linear predictive analysis, auto-correlation, integral procedure, time-frequency analysis, frequency extraction, accuracy improvement.

EMCABS: 08-8-2005
INVESTIGATION OF RELATIONS BETWEEN MEASUREMENT DISTANCE AND ELECTRIC FIELD STRENGTH FOR RADIATED EMISSION TEST USING ARTIFICIAL RADIATION SOURCE
+Ryo Matsubara, ++Masato Kawabata, ++Yasuhiro Ishida and +Nobuo Kuwabara
+ Department of Electrical Engineering, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu-shi, 804-8550 Japan
++ Fukuoka Industrial Technology Center, Kitakyushu-shi, 807-0831 Japan
kuwabara.nobuo@buddy.elcs.kyutech.ac.jp
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.4, 2004, pp.535-543.
Abstract: Electric field strength dependence on the measurement distance is examined using an artificial radiation source. The imitated equipment, in which we could calculate electric field strength, was used as the radiation source. The experiment indicated that the standard deviation between measurement and calculation of electric field strength was within 1.9 dB, which was sufficient accuracy to investigate the distance dependence. The investigation using the calculated value shows that electric field strength does not decrease in proportion to the distance, and the dependence on the distance is improved to increase the maximum receiving antenna height and to sweep the antenna along a circular arc.
Index terms: Radiation emission test, imitated equipment, method of moment.

EMCABS: 09-8-2004
MEASURING INSTRUMENT FOR HIGH-FREQUENCY CURRENTS FLOWING ON POWER LINES
Junichiro Urabe, Katsumi Fujii, Yasushi Matsumoto and Akira Sugiura
Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai-shi, 980-8577 Japan
jurabe@riec.tohoku.ac.jp
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.7, 2004, pp.990-999.
Abstract: A novel measuring instrument has been developed for power line currents in the frequency range of 1 to 30 MHz. It consists of a pair of shielded loop antennas and a 180° hybrid junction to ensure simultaneous measurements of the differential- and common-mode current components independently. First, theoretical analysis is rigorously carried out on the characteristics of the measuring instrument, which can yield a guideline for design of the instrument. Then, practical measurements using a proto-type instrument are made on mains disturbance currents generated by various electronic devices. Finally, it is concluded that the newly developed instrument is very useful for evaluating and controlling the interference potential of electronic equipment. In addition, the instrument can provide valuable data necessary for establishing the measurement method and the limit for the conducted emission of electronic equipment.
Index terms: Conducted disturbance, EMI, EMI measurement, common-mode, differential-mode.

EMCABS: 10-8-2005
INVESTIGATION ON SUPPRESSION EFFECT OF RADIATED ELECTROMAGNETIC FIELD FROM PRINTED CIRCUIT BOARD WITH DIFFERENTIAL TRANSMISSION MODE USING METHOD OF MOMENTS
+Ryo Matsubara, ++Kenji Miyauchi, +++Yasuhiro Ishida, ++++Masamitsu Tokuda and +Nobuo Kuwabara
+ Department of Electrical Engineering, Kyushu Institute of Technology, Kitakyushu-shi, 804-8550 Japan
++ Fujitsu Limited, Kawasaki-shi, 211-8588 Japan
+++ Fukuoka Industrial Technology Center, Kitakyushu-shi, 807-0831 Japan
++++ Faculty of Electrocommunication Engineering, Musashi Institute of Technology, Tokyo, 158-8557 Japan
kuwabara.nobuo@buddy.elcs.kyutech.ac.jp
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.11, 2004, pp.1926-1935.
Abstract: This paper studies the analysis model of the radiated emission suppression effect for a differential transmission mode using a parallel micro-strip line. The theoretical and experimental investigation indicate that the model, where the PCB being represented by the equivalent dielectric constant and circular conductive cylinder with equivalent radius, is effective to analyze the effect by the method of moments. The investigation using this model indicates that the suppression effect increases in proportion to the decrease of conductor space, and the effect decreases due to the corner and asymmetry of the line.
Index terms: Printed circuit board, differential transmission mode, parallel micro-strip line, method of moments.

EMCABS: 11-8-2005
MULTI-LAYERED PERMEABLE WAVE ABSORBER
+Takashi Nakamura, +Tatsunari Deguchi and ++Risaburo Sato
+ Faculty of Engineering, Gifu University, Gifu-shi, 501-1193 Japan
++ Sendai Electromagnetic Compatibility Research Center, Sendai-shi, 989-3204 Japan
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.11, 2004, pp.1936-1942.
Abstract: Multi-layered wave absorbers permitting some permeation or transmission are proposed in this paper. The basic form of the wave absorber is a simple structure of a dielectric layer stuck by a resistive film instead of a conventional metal plate on the back side. Permission of transmission and a lossless dielectric layer are features of this absorber. Multilayers can be made simply by piling up wave absorbers designed for a single 1ayer. As examples of a multilayer structure, permeation reduction can be obtained by piling up the single layer wave absorbers of the same structure, and wide frequency and angle characteristics by piling up the single 1ayer wave absorbers of different permittivity. Permeable wave absorbers for the wireless LAN and ETC are measured and the validity of the theory is clarified.
Index terms: Wave absorber, transmission wave, resistive film, nonreflection, multi-layer.

EMCABS: 12-8-2005
DEVELOPMENT OF ESTIMATION SYSTEM OF RELATIVE PERMEABILITY AND CONDUCTIVITY OF THIN MATERIALS
+Toshihide Tosaka, +Isamu Nagano, +Satoshi Yagitani and ++Yoshiyuki Yoshimura
+ Graduate School of Natural Science & Technology, Kanazawa University, 2-40-20 Kodatsuno, Kanazawa-shi, 920-8667 Japan
++ Industrial research Institute of Ishikawa, 2-1 Kuratsuki, Kanazawa-shi, 920-8203 Japan
The IEICE Transactions on Communications (Japanese Edition), Vol.J87-B No.11, 2004, pp.1943-1950.
Abstract: Several methods have been developed to measure the relative permeability and conductivity of various electromagnetic shielding materials. However, when the material is a thin cloth, conventional methods would be difficult to estimate such electric parameters. Therefore, we construct a shielding box and develop a measuring system to estimate the unknown electric parameters of the shielding materials such as thin cloth. This system can be easily constructed with low cost. By comparing the shielding effectiveness (SE) measured with the shielding box with that calculated numerically with assumed electric parameters, we estimate the electric parameters of the shielding materials. We use this system to investigate the frequency characteristics of the electric parameters of diamagnetic and ferromagnetic materials and successfully estimate relative permeability and conductivity of any type of thin material.
Index terms: Relative permeability, conductivity, shielding effectiveness, Sommerfeld integral. EMC