Reconfigurable and tunable S-shaped split-ring resonators and application in band-notched UWB antennas

Ali Karami Horestani, Zahra Shaterian, Jordi Naqui, Ferran Martin, Christophe Fumeaux

Research output: Contribution to journalArticleResearchpeer-review

131 Citations (Scopus)


© 1963-2012 IEEE. This paper proposes a compact reconfigurable (bandstop/bandpass) and frequency-tunable structure based on S-shaped split-ring resonators (S-SRRs). It is known that an S-SRR coupled to a coplanar waveguide (CPW) provides a stopband in the transmission characteristic of the line. It is shown here that this behavior of the S-SRR can be switched between fundamental resonance and second harmonic response by introduction of a p-i-n diode in the center segment of the S-SRR. Alternatively, if the S-SRR is loaded with a varactor diode instead of a switch, the frequency of the stopband can be continuously tuned from the S-SRRs fundamental resonance frequency to its second harmonic. Furthermore, it is shown that if a pair of shunt p-i-n diodes are introduced across the slots of the host CPW, the structure can be reconfigured from a bandstop to a bandpass structure. Thus, the proposed resonator structure can be used as the building block of reconfigurable (bandstop/bandpass) filters with tunable operating frequency. Finally, to demonstrate a practical application of the proposed structure, an ultrawideband antenna with a tunable band notch is designed and experimentally validated.
Original languageEnglish
Article number7500074
Pages (from-to)3766-3776
JournalIEEE Transactions on Antennas and Propagation
Issue number9
Publication statusPublished - 1 Sept 2016


  • Reconfigurable antennas
  • S-shaped split-ring resonator (S-SRR)
  • ultrawideband (UWB) antenna


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