MISC

2009年6月

Increase of Common-Mode Radiation due to Guard Trace Voltage and Determination of Effective Via-Location

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

E92B
6
開始ページ
1929
終了ページ
1936
記述言語
英語
掲載種別
DOI
10.1587/transcom.E92.B.1929
出版者・発行元
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

A guard trace placed near a signal line reduces common-mode radiation front a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors, when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace, the radiation can increase when the guard trace resonates. In this paper, the authors show that the increase of radiation is caused by the common mode, and extend the imbalance difference model to explain a mechanism of increase of common-mode radiation. Additionally, the effective via location of the guard trace is proposed to reduce the number of vias. The guard trace voltage due to the resonance excites the common mode at the interface where the cross-sectional structure of the transmission line changes since the common-mode excitation is expressed by the product of the voltage and the difference of current division factors. To suppress the common-mode excitation, the guard trace should be grounded at the point where the cross-sectional structure changes. As a result, the common-mode radiation decreases even when the guard trace resonates.

リンク情報
DOI
https://doi.org/10.1587/transcom.E92.B.1929
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000267638400003&DestApp=WOS_CPL
ID情報
  • DOI : 10.1587/transcom.E92.B.1929
  • ISSN : 1745-1345
  • Web of Science ID : WOS:000267638400003

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