Inset-microstrip-line-fed dual-frequency circular microstrip antenna and its application to a two-element dual-frequency microstrip array

Author

Hsieh, G.-B. ; Wong, K.L.

Author_Institution

Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan

Volume

146

Issue

5

fYear

1999

fDate

10/1/1999 12:00:00 AM

Firstpage

359

Lastpage

361

Abstract

A new dual-frequency design of an inset-microstrip-line-fed circular microstrip antenna with an arc-shaped slot is proposed and experimentally studied. The two operating modes of the proposed antenna are associated with the perturbed TM₁₁ and TM₀₁ modes and have the same polarisation planes and similar broadside radiation characteristics. By varying the length of the arc-shaped slot, the proposed antenna can provide a tunable frequency ratio of about 1.29 to 1.43 for the two operating frequencies. The application of the proposed antenna to the design of a two-element dual-frequency microstrip array is also demonstrated. Details of the obtained dual-frequency performances of the proposed dual-frequency design are presented and discussed

Keywords

UHF antennas; antenna feeds; antenna radiation patterns; microstrip antenna arrays; microstrip antennas; multifrequency antennas; slot antennas; TM₀₁ mode; TM₁₁ mode; arc-shaped slot; broadside radiation characteristics; circular microstrip antenna; dual-frequency antenna; inset-microstrip-line-fed antenna; polarisation planes; tunable frequency ratio; two-element dual-frequency microstrip array;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:19990667

Filename

810801