Coplanar waveguides loaded with s-shaped split-ring resonators: Modeling and application to compact microwave filters

Ali K. Horestani, Miguel Duran-Sindreu, Jordi Naqui, Christophe Fumeaux, Ferran Martin

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)

Abstract

This letter studies the transmission characteristics of coplanar waveguides (CPWs) loaded with single-layer S-shaped split-ring resonators (S-SRRs) for the first time. Two structures are analyzed: 1) a CPW simply loaded with an S-SRR, and 2) a CPW loaded with an S-SRR and a series gap. The former exhibits a stopband functionality related to the resonance of the S-SRR excited by the contra-directional magnetic fluxes through the two connected resonator loops; the latter is useful for the implementation of compact bandpass filters. In both cases, a lumped-element equivalent circuit model is proposed with an unequivocal physical interpretation of the circuit elements. These circuits are then validated by comparing the circuit response with extracted parameters to full-wave electromagnetic simulations. The last part of the letter illustrates application of the S-SRR/gap-loaded CPW unit cell to the design of a bandpass filter. The resulting filter is very compact and exhibits competitive performance. © 2014 IEEE.
Original languageEnglish
Article number6851852
Pages (from-to)1349-1352
JournalIEEE Antennas and Wireless Propagation Letters
Volume13
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Coplanar waveguide (CPW)
  • Electromagnetic metamaterials
  • Planar filters
  • Split-ring resonators (SRRs)

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