Cavity model of circularly polarised cross-aperture-coupled microstrip antenna

B. Al-Jibouri, H. Evans, E. Korolkiewicz, E. G. Lim, A. Sambell, T. Viasits

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24 Citations (Scopus)


A cavity model is used to analyse an aperture-fed nearly square circularly polarised patch antenna. The form of the aperture is that of a symmetric cross-slot that couples the excitation between a single microstrip feed line and the patch antenna. Using equivalent magnetic current sources at the slots, the modal electric and magnetic fields under the patch are obtained, and hence analytical expressions for the patch admittances at the aperture are derived and used to obtain an equivalent circuit of the circular polarised antenna. Good agreement is obtained between the circuit modelling and practical results.

Original languageEnglish
Pages (from-to)147-152
Number of pages6
JournalIEE Proceedings: Microwaves, Antennas and Propagation
Issue number3
Publication statusPublished - 1 Jun 2001
Externally publishedYes

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