Wideband High-Gain Open Resonator Antenna Using a Spherically Modified, Second-Order Cavity

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

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Original languageEnglish
Article number7805175
Pages (from-to)2112-2116
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number4
Publication statusPublished - 1 Apr 2017


In this communication, we present a simple yet unconventional wideband resonant cavity antenna (RCA) with high gain and large gain-bandwidth product (GBP). The bandwidth enhancement of the RCA is approached by using a second-order height resonant cavity comprising a dielectric slab of high permittivity as the partially reflective surface and a ground plane with spherically modified geometry. It is shown that by imitating an open resonator structure, the spherically modified cavity can support multiple quasi-Laguerre-Gaussian beam modes and hence, dramatically improve the operation bandwidth of the RCA. A RCA with large GBP is designed, simulated, and then verified through measurement. Measured results show a bandwidth of 25% with a peak gain of 17.7 dBi. The proposed low-cost and easy-fabricate method shows its effectiveness in increasing the bandwidth for the RCA.

Research Area(s)

  • Bandwidth enhancement, open resonator theory, partially reflective surface (PRS), resonant cavity antenna (RCA)