Common-Mode Filters with Interdigital Fingers for Harmonics Suppression and Lossy Materials for Broadband Suppression

Qian Liu, Guanghua Li, Victor Khilkevich, David Pommerenke

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Common-mode (CM) noise on differential microstrip lines can be suppressed by PCB-embedded filters. These filters use resonating or broadband structures such that only the field from the CM signal couples to them. Based on a quarter-wavelength resonator, a new PCB filter is designed having an electrical size of only 0.15 λ × 0.065 λ, where λ is the effective wavelength in the CM filter. Its interdigital structure is also capable of suppressing higher order harmonics of the CM signal and can be used for USB 3.0 to mitigate electromagnetic interference. Further, a novel broadband suppression structure is described that uses magnetically lossy material to suppress the CM signal from 4.6 to 20 GHz without strongly affecting the intended differential signal.

Original languageEnglish
Article number7287787
Pages (from-to)1740-1743
Number of pages4
JournalIEEE Transactions on Electromagnetic Compatibility
Volume57
Issue number6
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

Keywords

  • Broadband filter
  • common-mode filter
  • differential signal
  • narrowband filter
  • quarter-wavelength

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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