Behaviour of the parallel plate mode in a stripline slot-coupled patch antenna

Author

Yamamoto, M. ; Itoh, Kenji

Author_Institution

Div. of Electron. & Inf. Eng., Hokkaido Univ., Sapporo, Japan

Volume

147

Issue

5

fYear

2000

fDate

10/1/2000 12:00:00 AM

Firstpage

385

Lastpage

389

Abstract

Excitation of the parallel plate mode is a serious concern in a stripline slot-coupled patch antenna, and the paper is a study of its behaviour. The frequency dependence of the parallel plate mode power ratio to the input power of the antenna is discussed by means of an equivalent circuit of the antenna. It is found that the parallel plate mode power ratio is very small when the antenna is operated at the resonant frequency of the patch. A prototype antenna (in which impedance matching is obtained at the resonant frequency of the patch) is designed and fabricated. Measurement of the parallel plate mode power is performed to confirm the validity of the considerations. It is concluded that the antenna should be operated at the resonant frequency of the patch to minimise the unwanted effect concerning the parallel plate mode

Keywords

UHF antennas; electromagnetic coupling; equivalent circuits; impedance matching; microstrip antennas; 2.35 to 2.43 GHz; UHF; design; equivalent circuit; fabrication; frequency dependence; impedance matching; input power; parallel plate mode; parallel plate mode power ratio; prototype antenna; resonant frequency; stripline slot-coupled patch antenna;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20000429

Filename

878168