Title :
Cavity model of circularly polarised cross-aperture-coupled microstrip antenna
Author :
Al-Jibouri, B. ; Evans, H. ; Korolkiewicz, E. ; Lim, E.G. ; Sambell, A. ; Viasits, T.
Author_Institution :
Sch. of Eng., Univ. of Northumbria, Newcastle upon Tyne, UK
fDate :
6/1/2001 12:00:00 AM
Abstract :
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
Keywords :
antenna theory; electric admittance; electric impedance; electromagnetic wave polarisation; equivalent circuits; microstrip antennas; axial ratio; cavity model; circularly polarised patch antenna; cross-aperture-coupled microstrip antenna; equivalent circuit; equivalent magnetic current sources; input impedance; modal electric fields; modal magnetic fields; patch admittance; symmetric cross-slot;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:20010498
