INFLUENCE OF DEVICE STRUCTURE ON ELECTROMAGNETIC (EM) INFORMATION LEAKAGE FROM THE DEVICE
+ Kouhei Ohmura, ++ Yu-ichi Hayashi, +++ Takaaki Mizuki and +++ Hideaki Sone
+ Graduate School of Information Science, Tohoku University, 6–3 Aramaki Aza Aoba, Aoba-ku, Sendai, 980–8578 Japan
++ Graduate School of Engineering, Tohoku University, 6–3 Aramaki Aza Aoba, Aoba-ku, Sendai, 980–8578 Japan
+++ Cyberscience Center, Tohoku University, 6–3 Aramaki Aza Aoba, Aoba-ku, Sendai, 980–8578 Japan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 19–22.
Abstract: A working information device radiates electromagnetic (EM) field around itself, and the problem is known that the information leaks via the EM field. The device which consists of a printed circuit board (PCB) and attached lines behaves as a frequency filter, through which the EM field is emanated. In this paper, the authors show the filter frequency characteristics depend on the number of attached lines, on the length of the attached line and on the size of the PCB. These results imply that we should pay more attention to the device structure, and that we can suppress the EM information leakage by considering the structure.
Index terms: Electromagnetic information leakage, printed circuit board, frequency filter, device structure.
A MEASUREMENT METHOD FOR 2-D EMF DISTRIBUTIONS USING OPTICAL TRACKER
+ Ken Sato, + Toshiaki Kawata and + Yoshitsugu Kamimura
+ Graduate School of Engineering, Utsunomiya University 7-1-2 Yoto, Utsunomiya-shi, Tochigi, 321-8585 Japan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 27–29.
Abstract: Recently, we have proposed the freehand scanning method for measuring field distribution using a magnetic tracker to determine the position of an EMF sensor. However, a magnetic tracker cannot obtain correct location data if there are some metals around the measurement area though it has enough accuracy for determining the position. In this study, an optical tracker that consists of the USB camera and PC with Open CV is used instead of a magnetic tracker to determine the measurement position. As a result, it is found that an optical tracker is useful for the real-time, rough measurement of 2-D field distribution.
Index terms: Measurement method for 2-D field distribution, optical tracker, EMF sensor, real-time freehand scan.
CONSERVATIVE CALCULATION OF WHOLE-BODY AVERAGED SARS OVER 1 GHZ IN INFANTS
+ Hironobu Miwa, + Akimasa Hirata, + Osamu Fujiwara, ++ Tomoaki Nagaoka and ++ Soichi Watanabe
+ Department of Computer Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555 Japan
++ National Institute of Information and Communications Technology 4-2-1 Nukuikitamachi, Koganei, Tokyo, 160-8582, Japan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 43–46.
Abstract: We previously showed that conservative estimates of whole-body-average specific absorption rates (WBA-SARs) in children can be given by homogeneous ellipsoids having the same physique, and also that our proposed formula for calculating GHz-band WBA-SARs in terms of height and weight provides conservative WBA-SARs in infants with the median height and the Kaup index of 0.5 percentile. In this study, we compared WBA-SARs at frequencies over 1 GHz in infants calculated from their corresponding homogeneous ellipsoids with conservative estimates from the formula to reveal that the formula gives approximately the same and conservative estimates as those from the ellipsoids with 2/3-muscle and muscle tissues, respectively.
Index terms: Infants, whole-body averaged SARs, Kaup index, conservative calculation.
PHYSICS-BASED MODELING OF DGS FILTER FORMED ON RETURN PLANE OF PRINTED CIRCUIT BOARDS
+ Keisuke Matsumoto, + Yoshitaka Toyota y, + Kengo Iokibe and + Ryuji Koga
+ Graduate School of Natural Science and Technology, Okayama University 3-1-1, Tsushima-Naka Kita-ku Okayama-shi, 700-8530 JAPAN
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 51–54.
Abstract: The slit pattern formed on the return plane of printed circuit boards (PCBs) acts like a passive element and a defected ground structure (DGS) is one of them. The characteristics of DGS are easily varied with the slit pattern. Thus, DGS is expected to be used for various applications. Since a design method has yet to be developed, however, we need to establish a design method for the slit pattern. Some equivalent circuit models have been used, but the models that consist of lumped elements require a full-wave simulation. In addition, the values of the lumped elements do not relate to the physical parameters. Therefore, it is not useful for designing filters. In contrast, the equivalent circuit model we propose in this paper will have a great contribution to designing filters with optimum performances because the transmission line model relates to the physical parameters. As a result, by comparing the transmission characteristics calculated with both a full-wave and a circuit simulator with the proposed equivalent circuit model, the first stop-band width was in agreement.
Index terms: Printed circuit boards, slit pattern, return plane, defected ground structure filter.
A BRIEF MODEL OF THE COMMON-MODE EXCITATION IN NON-UNIFORM TRANSMISSION LINES
+ Ryuji Koga
+ Professor Emeritus, Okayama University 6-20-3, Tsushima-Fukui-1, Kita-ku, Okayama 700-0080, Japan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 71–74.
Abstract: The common mode is excited when two transmission lines with different cross-sectional profiles are connected even if perfect differential mode current is injected into one of the lines. A simple model to evaluate the quantity of the common mode current/voltage is proposed and exemplified of its convenience. The issue is made under the proposition that the common mode is very weak in comparison to that of differential mode in an actual electric device which is conscious of EMI: TEM mode is almost retained over the two lines.
Index terms: Non-uniform transmission lines, EMI, common-mode excitation model.
TECHNICAL TRENDS IN HIGH-SPEED POWER LINE COMMUNICATION
+ Masamitsu Tokuda
+ Department of Information Network Engineering, Tokyo City University 1-28-1 Tamazutsumi, Setagaya-Ku, Tokyo, 158–8557 Japan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 103–106.
Abstract: High-speed power line communication (PLC) can transmit an information signal of several hundred megabits per second over the power lines that transport electrical energy. Because this system employs unmodified existing transmission lines and the signal can be accessed through the simple interface of an ordinary electrical outlet, it promises to serve as the most effective transmission system for supporting information in home appliances. For high-speed PLC to become practical, it requires that the frequencies used be expanded to 30 MHz, a frequency band that is already used by many wireless communication systems. Thus, shared use with those systems is the most important problem. This paper introduces technical trends related to that issue.
Index terms: Power line communication, electrical outlet, information home appliances, transmission system.
SOME RESEARCH WORKS ON LOW FREQUENCY ELECTROMAGNETIC BIOEFFECT IN CHINA
+ Gao Yougang, Li Li, + Shi Dan and + Jiang Xiao
+ P.O. Box 171, Beijing University of Posts and Telecom, Beijing, 100876, China
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 139–151.
Abstract: People pay much attention to low frequency electromagnetic bioeffects these days. This work gives the general formula for calculating the electric fields around a 3-phase symmetrical power transmission line when the heights of its conductors are different from each other. It gives also the method for calculating electric fields around asymmetrical lines and the method for calculating magnetic field around power transmission lines and AC electrified railways. The minimum permissible separation distance between the power line and residence has been given. Finally, it gives the ordinary permissible exposure limits in China.
Index terms: Low frequency electromagnetic bioeffect, 3-phase symmetrical power transmission line, AC electrified railways, minimum permissible separation distance, ordinary permissible exposure limits.
Review of the Development of Breast Cancer Detection System Using Microwave Tomography Technology
+ Jeong-Ki Pack, + Tae-Hong Kim and ++ Soon-Ik Jeon
+ Radio Department, Chungnam National University, 220 Gung-dong Yuseong-gu, Daejeon, 305–764, South KOREA
++ Antenna Research Team, ETRI, 161 Gajeong-dong Yuseong-gu, Daejeon, 305–700, South KOREA
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 163–166.
Abstract: In this paper, the breast cancer detection system under development is reviewed. The system consists of RF sensing, signal processing, digital signal processing, system control and monitoring parts. This is the microwave tomography system operating in the frequency range of 500–3000 MHz. To solve the inverse scattering problem, we used the FDTD (Finite Difference Time Domain) for the forward problem and the Gauss-Newton method as the optimization algorithm. The results of the reconstructed image showed that we can detect the position of the tumor exactly.
Index terms: Breast cancer detection system, microwave tomography technology, inverse scattering problem, FDTD simulation.
Broadband Common-mode Noise Rejection for GHz Differential Signals Using Defected Ground Structures
+ Chung-Hao Tsai and + Tzong-Lin Wu
+ Graduate Institute of Communication Engineering, National Taiwan University Taipei, 10617 Taiwan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 189–190.
Abstract: A wideband and compact filter design for common-mode noise suppression in high-speed differential signals is proposed. It is based on two U-shaped and one H-shaped coupled patterned ground structures. An equivalent lumped model of three coupled LC resonators to predict the common-mode suppression characteristics is also developed. The model shows a good agreement to the full-wave simulation and measurement result. A test sample is designed and fabricated on a standard PCB. It is found the common-mode noise can be reduced by the filter over 15 dB from 3.6 GHz to 9.1 GHz.
Index terms: GHz differential signals, common-mode noise rejection, defected ground structures, wideband and compact filter design.
How to Enhance EMC Self-learning
+ Werachet Khan-Ngern
+ Faculty for Engineering, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 219–222.
Abstract: The paper presents the aspect of enhancing EMC self-learning using the simplicity of tools and equipment, IT media and demonstration. The proposed model of EMC self-learning is presented. The EMC concept is introduced. Then, some EMC self-learning examples are presented. The EMC study base on radiated EMI emission is demonstrated by the comparison between the EMC testing with and without EMC design.
Index terms: EMC self-learning, EMI emission, EMC testing, EMC design, demonstration.
DEVELOPMENT OF LOW-FREQUENCY, WIDEBAND MAGNETIC FIELD DOSIMETER AND ITS APPLICATION TO MEASUREMENT OF CONDUCTED EMISSION FROM APPLIANCES
+ Kenichi Yamazaki and + Kiyotomi Miyajima
+ Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka-shi, Kanagawa, 240-0196 Japan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 239–242.
Abstract: A low-frequency, wideband (25 Hz–100 kHz) magnetic field dosimeter was developed and applied to characterize conducted emissions (noise current) generated by consumer appliances such as IH (induction heating) cookers and PVC (photo voltaic conditioner). The result showed that the magnetic field sensors were successfully applicable to characterize the conducted emissions without splitting conductors of cables.
Index terms: Consumer appliances, conducted emissions, low-frequency wideband magnetic field dosimeter, development.
A Unified Phantom for the SAR Compliance Test of Mobile Phones
+ Lira Hamada,++ Takahiro Iyama, + Teruo Onishi and ++ Soichi Watanabe
+ National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 184–8795, Japan
++ NTT DOCOMO, INC., 3–6, Hikarino-oka, Yokosuka, Kanagawa 239-8536, Japan
Proc. of 4th Pan-Pacific EMC Joint Meeting, May 27–28, 2010/Sendai, Japan, pp. 243–246.
Abstract: For the compliance test of mobile phones, the Specific Anthropomorphic Mannequin (SAM) phantom is used as the standardized human head. This measurement procedure is highly reliable; however, a simplified test procedure is needed for the reduction of the measurement number per one phone. Therefore, a simplified phantom (Uniphantom) has been proposed, which is a unification of the SAM and the flat phantom for body-worn device measurement. As a preliminary study, applicability of this phantom to the compliance test of various mobile phones is presented.
Index terms: Compliance test, specific anthropomorphic mannequin (SAM) phantom, simplified uniphantom, body-worn device measurement.EMC