Input impedance of annular-ring microstrip antennas with a dielectric cover

Author

Fan, Zhibo ; Lee, Kai-Fong

Author_Institution

Dept. of Space Phys., Wehan Univ., Hubei, China

Volume

40

Issue

8

fYear

1992

fDate

8/1/1992 12:00:00 AM

Firstpage

992

Lastpage

995

Abstract

A theoretical and numerical analysis of the annular-ring microstrip antenna with a dielectric cover is performed. The problem is formulated in the Hankel transform domain, taking a coaxial feed into consideration. The integral equations for the surface current density on the patch are derived. Galerkin´s method is used to solve for the surface current density, and a stationary formula for the input impedance is obtained. Numerical results showing the effects of a dielectric cover on the TM₁₂ mode of the annular ring are given. It is found that the dielectric cover reduces the resonant frequency, decreases the resonant resistance, and increases the impedance bandwidth

Keywords

antenna theory; electric impedance; integral equations; microstrip antennas; numerical analysis; Galerkin´s method; Hankel transform domain; TM₁₂ mode; annular ring; coaxial feed; dielectric cover; impedance bandwidth; input impedance; integral equations; microstrip antennas; moment method; numerical analysis; patch; resonant frequency; resonant resistance; surface current density; Antenna theory; Coaxial components; Current density; Dielectrics; Feeds; Integral equations; Microstrip antennas; Numerical analysis; Surface impedance; Transforms;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.163440

Filename

163440