Analysis of a cavity-backed annular slot antenna with one point shorted

Author

Morishita, Hisashi ; Hirasawa, Kazuhiro ; Fujimoto, Kyohei

Author_Institution

Inst. of Appl. Phys., Tsukuba Univ., Japan

Volume

39

Issue

10

fYear

1991

fDate

10/1/1991 12:00:00 AM

Firstpage

1472

Lastpage

1478

Abstract

Analysis of a cavity-backed annular slot antenna with one point shorted is performed experimentally and theoretically. Resonance frequencies, bandwidths, and radiation patterns are studied with respect to slot width, cavity depth, and slot shorting position. In the theoretical analysis, the method of moments is applied to find the magnet current on the slot, and the Green´s function for the field inside the cavity has been newly derived. By selecting a slot shorting position, circular polarization, and a bandwidth of more than 10%, the voltage standing-wave ratio (VSWR) ⩽2 for the input impedance is obtained

Keywords

antenna radiation patterns; electric impedance; waveguide antennas; Green´s function; VSWR; bandwidth; cavity depth; cavity-backed annular slot antenna; circular polarization; input impedance; magnet current; method of moments; radiation patterns; resonance frequency; slot shorting position; slot width; voltage standing-wave ratio; Antenna radiation patterns; Antenna theory; Bandwidth; Green´s function methods; Magnetic analysis; Magnetic resonance; Moment methods; Performance analysis; Resonant frequency; Slot antennas;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.97378

Filename

97378