Optimum directivity coverage of fan-beam antennas

Author

Runyon, D.L.

Author_Institution

EMS Wireless, EMS Technol., Inc, Norcross, GA

Volume

44

Issue

2

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

66

Lastpage

70

Abstract

Cellular and point-to-multipoint wireless communication systems use fan-beam antennas for sector coverage from the central station. The ratio of the azimuth-to-elevation half-power beamwidth typically ranges from two for sites requiring low-gain antenna values to 25 or greater for sites covering large cells. This article presents an approximate formula for the antenna directivity of the fan-beam antenna using two parameters to describe the azimuth pattern shape, and two parameters for the elevation pattern. The directivity formula presented includes minor lobes. A variation of the fan-beam directivity formula is presented for the omnidirectional antenna. The directivity formula presented in this note is developed from separable-pattern functions, and uses a pattern-shape parameter in addition to the half-power-beamwidth value

Keywords

antenna radiation patterns; approximation theory; cellular radio; directive antennas; optimisation; shaped beam antennas; antenna directivity; approximate formula; azimuth pattern shape; azimuth-to-elevation half-power beamwidth ratio; base station antennas; cellular communication systems; directive antennas; elevation pattern; fan-beam antennas; fan-beam directivity formula; minor lobes; omnidirectional antenna; optimum directivity coverage; point-to-multipoint wireless communication systems; sector coverage; separable-pattern functions; shaped beam antennas; Antenna radiation patterns; Antennas and propagation; Aperture antennas; Base stations; Directional antennas; Directive antennas; Equations; Land mobile radio equipment; Medical services; Mobile antennas;

fLanguage

English

Journal_Title

Antennas and Propagation Magazine, IEEE

Publisher

ieee

ISSN

1045-9243

Type

jour

DOI

10.1109/MAP.2002.1003636

Filename

1003636