Compact and bandwidth-enhanced zeroth-order resonant antenna

Pei-Ling Chi*, Yi Sen Shih

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


In this letter, a simple bandwidth-enhanced zeroth- order resonant (ZOR) antenna is proposed. The presented antenna is composed of two unit cells of the composite right/left-handed (CRLH) artificial structure and operates in the series resonant mode. In order to enhance the operational bandwidth, in particular, the interdigital capacitor in a unit cell was properly designed so as to reduce the quality factor of the resonator while occupying a relatively small area. Additionally, to facilitate implementation of the short-circuited boundary condition, the coplanar waveguide (CPW) was applied to develop a via-less uniplanar antenna prototype. Experimental results show that the presented ZOR antenna achieves a 10-dB bandwidth of 15.1% and a peak radiation gain of 1.62 dBi with a compact size of 0.14λ0 × 0.22λ0 at the operating frequency. Measured and simulated results are in good agreement.

Original languageEnglish
Article number6924727
Pages (from-to)285-288
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
StatePublished - 1 Jan 2015


  • Bandwidth-enhanced
  • compact
  • composite right/left-handed (CRLH)
  • coplanar waveguide
  • zeroth-order resonant (ZOR) antenna

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