MISC

2009年6月

Evaluation of EMI Reduction Effect of Guard Traces Based on Imbalance Difference Model

IEICE TRANSACTIONS ON COMMUNICATIONS
  • Tohlu Matsushima
  • ,
  • Tetsushi Watanabe
  • ,
  • Yoshitaka Toyota
  • ,
  • Ryuji Koga
  • ,
  • Osami Wada

E92B
6
開始ページ
2193
終了ページ
2200
記述言語
英語
掲載種別
DOI
10.1587/transcom.E92.B.2193
出版者・発行元
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

Placing a guard trace next to a signal line is the conventional technique for reducing the common-mode radiation from a printed circuit board. In this paper, the suppression of common-mode radiation from printed circuit boards having guard traces is estimated and evaluated using the imbalance difference model, which was proposed by the authors. To reduce common-mode radiation further, a procedure for designing a transmission line with guard traces is proposed. Guard traces connected to a return plane through vias are placed near a signal line and they decrease a current division factor (CDF). The CDF represents the degree of imbalance of a transmission line, and a common-mode electromotive force depends on the CDF Thus, by calculating the CDF, we can estimate the reduction in common-mode radiation. It is reduced not only by placing guard traces, but also by narrowing the signal line to compensate for the variation in characteristic impedance due to the guard traces. Experimental results showed that the maximum reduction in common-mode radiation was about 14 dB achieved by placing guard traces on both sides of the signal line, and the calculated reduction agreed with the measured one within 1 dB. According to the CDF and characteristic impedance calculations, common-mode radiation can be reduced by about 25 dB while keeping the characteristic impedance constant by changing the gap between the signal line and the guard trace and by narrowing the width of the signal line.

リンク情報
DOI
https://doi.org/10.1587/transcom.E92.B.2193
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000267638400033&DestApp=WOS_CPL
ID情報
  • DOI : 10.1587/transcom.E92.B.2193
  • ISSN : 0916-8516
  • eISSN : 1745-1345
  • Web of Science ID : WOS:000267638400033

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