Suppression of guard-trace resonance by matched termination for reducing common-mode radiation

Tetsushi Watanabe, Tohlu Matsushima, Yoshitaka Toyota, Osami Wada, Ryuji Koga

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We propose a novel technique of matching at both ends of the guard trace to suppress resonance. This approach is derived from the viewpoint that the guard trace acts as a transmission line. We examined that matched termination suppresses guard-trace resonance through simulating a circuit and measuring radiation. We found from these results that the proposed method enables guard-trace voltages to remain low and hence avoids increases in radiation. In addition, we demonstrated that "matched termination at the far end of the guard trace" could suppress guard-trace resonance sufficiently at all frequencies. We eventually found that at least two vias at both ends of the guard trace and only one matching resistor at the far end could suppress guard-trace resonance. With respect to fewer vias, the method we propose has the advantage of reducing restrictions in the printed circuit board layout at the design stage.

Original languageEnglish
Pages (from-to)1746-1753
Number of pages8
JournalIEICE Transactions on Communications
Issue number7
Publication statusPublished - Jul 2010


  • Common mode radiation
  • Current division factor
  • Guard trace
  • Imbalance difference model
  • Printed circuit board

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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