Compact coplanar waveguide band-pass filter at the s-band

J. Bonache, F. Martín, F. Falcone, J. García-García, I. Gil, T. Lopetegi, M. A.G. Laso, R. Marqués, F. Medina, M. Sorolla

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16 Citations (Scopus)


In this paper, it is demonstrated that split-ring resonators (SRRs) magnetically coupled to a coplanar waveguide (CPW) structure can be applied to the design of miniaturized band-pass filters. To this end, a two-stage prototype device consisting of a CPW with two signal-to-ground shorts and a series gap, combined with SRRs, is designed and fabricated. By virtue of the subwavelength operation of SRRs at their quasi-static resonance, the filter dimensions can be made to be very small in comparison to conventional distributed implementations. Other relevant features of the proposed structures are: (i) low insertion losses (<3.5 dB) in the allowed band, (ii) out-of-band rejection levels above 30 dB, and (iii) very sharp transition slopes. It is believed that these SRR-based structures can be of interest for the design of planar filters with potential application in future communication transceivers. © 2005 Wiley Periodicals, Inc.
Original languageEnglish
Pages (from-to)33-35
JournalMicrowave and Optical Technology Letters
Publication statusPublished - 5 Jul 2005


  • Coplanar waveguides (cpws)
  • Metamaterials
  • Microwave filters
  • Split-ring resonators (srrs)


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