Beam-steerable radial-line slot antenna array

Author

Subbarao, B. ; Fusco, V.F.

Author_Institution

High Frequency Labs., Queen´s Univ. of Belfast, UK

Volume

152

Issue

6

fYear

2005

Firstpage

515

Lastpage

519

Abstract

The authors describe the design and performance of an annular slot planar array antenna which can steer right-hand or left-hand circularly linearly polarised waves. The array consists of a radial cavity waveguide whose elements, 12 crossed slots, are designed to radiate in the frequency range 9.1-9.4 GHz. Phase shifters are realised by positioning dielectric fins in circular waveguides above each of these slots. In addition, the use of a four-probe three-post polariser to feed the radial cavity permits LHCP, RHCP or LP to be generated. The resulting array has an impedance bandwidth of 2% for <1.2 VSWR. Beam scan angles of up to 35/spl deg/ for RHCP/LHCP and LP were measured at 9.2 GHz and the gain of the antenna was 12.8 dBi.

Keywords

antenna feeds; antenna radiation patterns; aperture antennas; beam steering; circular waveguides; dielectric bodies; electromagnetic wave polarisation; loop antennas; phase shifters; planar antenna arrays; scanning antennas; slot antenna arrays; 9.1 to 9.4 GHz; LHCP; RHCP; annular planar array antenna; beam scanning; beam-steerable radial-line slot antenna array; circular waveguide; dielectric fin; four-probe three-post polariser; phase shifters; radial cavity feed; radiating element; right-hand beamforming;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20045100

Filename

1561733