Wideband and high-gain composite cavity-backed crossed triangular bowtie dipoles for circularly polarized radiation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Original languageEnglish
Article number5498953
Pages (from-to)3157-3164
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number10
Publication statusPublished - Oct 2010


A composite cavity-backed antenna excited by crossed triangular bowtie dipoles is proposed and investigated for circular polarization (CP) applications. It is fed by a novel balun, i.e., a transition from a microstrip line to double slot lines, providing symmetrical electric field distributions at the feeding port. Measurements of an optimized antenna prototype show that it can achieve an impedance bandwidth of over 57.6% for SWR ≤ 2;, a 3-dB axial-ratio bandwidth of 39%, a broadside gain of 8-10.7 dBi, and symmetrical radiation patterns over the whole operating band. The operating principles of the proposed antenna are analyzed carefully and found quite different from crossed thin-wire dipoles with very weak coupling. Problems in the feeding balun, greatly deteriorating the CP performance at the resonance, are clearly addressed and solved. Detailed parametric studies are given in the final part of this paper. © 2010 IEEE.

Research Area(s)

  • Bowtie antennas, cavity-backed antennas, circular polarization, unidirectional patterns

Citation Format(s)