Triple-feed circularly polarized triangular slot antenna using metamaterial transmission lines

Kwok L. Chung, Chi Ho Wong, Pak Laam Cheung, Ka Ho Chan

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


This article presents a metamaterial transmission-line-based triple-feed network, which is meant for wideband circularly polarized antennas. The feed network itself is capable of an octave bandwidth, from 1.6 to 3.2 GHz, for an amplitude error of ±0.5 dB and phase error of ±10°. Prototype of a triangular slot antenna was implemented to validate the proposed triple-feed network. The measurement results show that the entire antenna has an impedance bandwidth (standing-wave-ratio ≥ 2) of 73.4%, whereas the 3-dB axial-ratio bandwidth is obtained at 27%. Bidirectional beam patterns with opposed polarization senses have been observed.

Original languageEnglish
Pages (from-to)1419-1423
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number6
Publication statusPublished - Jun 2012
Externally publishedYes


  • circularly polarized antenna
  • composite right/left handed transmission line
  • metamaterial transmission line
  • triangular slot antenna


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