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

Volume

148

Issue

3

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

147

Lastpage

152

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;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20010498

Filename

942837