Analytical method for a circularly polarised rectangular microstrip antenna

Author

Fujimoto, T. ; Tanaka, K. ; Taguchi, M.

Author_Institution

Fac. of Eng., Nagasaki Univ., Japan

Volume

148

Issue

2

fYear

2001

fDate

4/2/2001 12:00:00 AM

Firstpage

85

Lastpage

90

Abstract

The paper proposes a formulation method for the wall admittance of an arbitrarily shaped microstrip antenna using spectral domain analysis. In the paper, the wall admittance of the circularly polarised rectangular microstrip antenna is calculated. The circularly polarised rectangular microstrip antenna is analysed using the cavity model. The electromagnetic fields within the antenna cavity are expanded in terms of the eigenfunctions in the cavity with sides extended by the edge extension length. The edge extension length is determined so that the eigenfunctions satisfy the Helmholtz equation at all frequencies. Their expansion coefficients are determined by the impedance boundary condition at the aperture. The calculated input impedance and axial ratio of the antenna agree fairly well with the measured data

Keywords

Helmholtz equations; antenna theory; eigenvalues and eigenfunctions; electric admittance; electric impedance; electromagnetic wave polarisation; microstrip antennas; spectral-domain analysis; Helmholtz equation; analytical method; aperture; arbitrarily shaped microstrip antenna; axial ratio; cavity model; circularly polarised rectangular microstrip antenna; edge extension length; eigenfunctions; electromagnetic fields; expansion coefficients; impedance boundary condition; input impedance; spectral domain analysis; wall admittance;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20010334

Filename

929776