Common-mode and differential-mode analysis of common mode chokes

Zhe Li*, David Pommerenke, Yoshifumi Shimoshio

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


In this paper three methods for the measuring common-mode and differentia-mode S-parameters of common mode chokes are presented. The three methods involve (1) ABCD chain matrix, 2) using hybrid couplers and 3) modal decomposition. Each measurement method provides a specific level of accuracy. The modal decomposition method can work up to 10 GHz. Given a full characterization of a common mode choke, a passive equivalent circuit model can be synthesized that provides a fundamental understanding of the physical performance. SPICE equivalent circuit model of common mode chokes and the extraction of model parameters are provided.

Original languageEnglish
Pages (from-to)384-387
Number of pages4
JournalIEEE International Symposium on Electromagnetic Compatibility
Publication statusPublished - 20 Oct 2003
Externally publishedYes
Event2003 IEEE Symposium on Electromagnetic Compatibility - Boston, MA, United States
Duration: 18 Aug 200322 Aug 2003


  • ABCD chain matrix
  • Common mode chokes
  • Common-mode insertion loss
  • Differential-mode insertion loss
  • Equivalent circuit model
  • Hybrid couplers
  • Mixed mode S-parameters

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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