Left Handed Coplanar Waveguide Band Pass Filters Based on Bi-layer Split Ring Resonators

Francisco Falcone, Ferran Martín, Jordi Bonache, Ricardo Marqués, Txema Lopetegi, Mario Sorolla

Research output: Contribution to journalArticleResearchpeer-review

86 Citations (Scopus)

Abstract

A new type of compact band pass filters based on planar structures with three metal levels is proposed. The central layer consists on a coplanar waveguide (CPW) with periodic wire connections between the central strip and ground planes. In the upper and lower metal levels, split ring resonators (SRRs) are etched and aligned with the slots. The wires make the structure to behave as a microwave plasma, with a negative effective permittivity covering a wide frequency range. SRRs, which are magnetically coupled to the CPW, provide a negative magnetic permeability in a narrow frequency range above their resonant frequency. The result is a band pass structure which supports wave propagation in a frequency interval where negative permittivity and permeability coexist. The bandwidth of the structure can be controlled by tuning the resonant frequency of the upper and lower SRRs and the distance between SRRs. Fabricated prototype devices exhibit very low insertion losses in the pass band (<1.5 dB) and high frequency selectivity.
Original languageEnglish
Pages (from-to)10-12
JournalIEEE Microwave and Wireless Components Letters
Volume14
DOIs
Publication statusPublished - 1 Jan 2004

Keywords

  • Coplanar waveguide (CPW) technology
  • Left handed materials
  • Microwave filters
  • Split ring resonators

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