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

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6 Author(s)
Al-Jibouri, B. ; Sch. of Eng., Univ. of Northumbria, Newcastle upon Tyne, UK ; Evans, H. ; Korolkiewicz, E. ; Lim, E.G.
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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

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:148 ,  Issue: 3 )

Date of Publication:

Jun 2001

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