Common-mode suppression in microstrip differential lines by means of complementary split ring resonators: Theory and applications

Jordi Naqui, Armando Fernández-Prieto, Miguel Durán-Sindreu, Francisco Mesa, Jesús Martel, Francisco Medina, Ferran Martín

Research output: Contribution to journalArticleResearchpeer-review

109 Citations (Scopus)

Abstract

This paper is focused on the application of complementary split-ring resonators (CSRRs) to the suppression of the common (even) mode in microstrip differential transmission lines. By periodically and symmetrically etching CSRRs in the ground plane of microstrip differential lines, the common mode can be efficiently suppressed over a wide band whereas the differential signals are not affected. Throughout the paper, we present and discuss the principle for the selective common-mode suppression, the circuit model of the structure (including the models under even- and odd-mode excitation), the strategies for bandwidth enhancement of the rejected common mode, and a methodology for common-mode filter design. On the basis of the dispersion relation for the common mode, it is shown that the maximum achievable rejection bandwidth can be estimated. Finally, theory is validated by designing and measuring a differential line and a balanced bandpass filter with common-mode suppression, where double-slit CSRRs (DS-CSRRs) are used in order to enhance the common-mode rejection bandwidth. Due to the presence of DS-CSRRs, the balanced filter exhibits more than 40 dB of common-mode rejection within a 34% bandwidth around the filter pass band. © 1963-2012 IEEE.
Original languageEnglish
Article number6289399
Pages (from-to)3023-3034
JournalIEEE Transactions on Microwave Theory and Techniques
Volume60
DOIs
Publication statusPublished - 5 Sep 2012

Keywords

  • Complementary split-ring resonator (CSRR)
  • differential transmission lines
  • metamaterial-inspired lines
  • split-ring resonator (SRR)

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