Experimental validation of imbalance difference model to estimate common-mode excitation in PCBs

Yoshitaka Toyota, Tohlu Matsushima, Kengo Iokibe, Ryuji Koga, Tetsushi Watanabe

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


We have proposed a common-mode antenna model that is designed specifically for estimating common-mode radiation from printed circuit boards (PCBs) very quickly. The model is composed of an antenna that has the same geometry as the adjacent ground plane of the PCB and an excitation source based on an imbalance difference model. The excitation source is provided by the product of Δh and VN, where Δh is the difference in current division factors related to the cross-sectional structure of the transmission line, and VN is the voltage between the signal line and return plane of the transmission line. Here, we describe an experimental validation of the common-mode excitation carried out by measuring the reduction in radiation due to a guard trace placed close to a signal line with a narrow return plane. As a result, it was found that the total common-mode excitation can be given by a superposition of two excitation sources. The results also suggest that when designing the PCB, the guard trace should be grounded at the interface between different ground-plane widths to suppress noise.

Original languageEnglish
Article number4652109
JournalIEEE International Symposium on Electromagnetic Compatibility
Publication statusPublished - 2008
Event2008 IEEE International Symposium on Electromagnetic Compatibility, EMC 2008 - Detroit, MI, Germany
Duration: Aug 18 2008Aug 22 2008


  • common-mode antenna model
  • common-mode radiation
  • guard trace
  • imbalance difference model
  • printed circuit board

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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