High-speed common-mode prediction method for PCBs having a signal line close to the ground edge

Tetsushi Watanabe, Akihiro Namba, Hiroshi Fujihara, Yoshitaka Toyota, Osami Wada, Ryugi Koga

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


Evaluation of common-mode excitation is important to efficiently reduce the EMI radiated from printed circuit boards (PCBs). We have focused on the excitation mechanisms of the common-mode current flowing on a PCB. In a previous paper, we explained a mechanism of common-mode excitation in terms of the current division factor, which expresses the degree of imbalance of a transmission line. The calculation is two-dimensional so the evaluation time is much shorter than that of FDTD or other 3D full-wave simulations. The calculated reduction of common-mode radiation from simple PCBs agreed well with the measured value. In this paper, to demonstrate the effectiveness of this approach, we apply it to various PCBs, such as one that has a signal trace close to a board edge or one with guard bands, and evaluate the effectiveness of the common-mode reduction. Our calculated and experimental results are in good agreement.

Original languageEnglish
Pages (from-to)28-33
Number of pages6
JournalIEEE International Symposium on Electromagnetic Compatibility
Publication statusPublished - Oct 20 2003
Event2003 IEEE Symposium on Electromagnetic Compatibility - Boston, MA, United States
Duration: Aug 18 2003Aug 22 2003


  • 2-D
  • Common mode
  • Current division factor
  • Edge
  • EMI
  • Ground
  • Guard band
  • PCB

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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