Array fed contoured beam antenna optimization with frequency variable excitations

Author

Uher, Jason ; Richard, S. ; Forest, M. ; Gupta, S.

Author_Institution

Space Syst., Spar Aerosp. Ltd., Ste-Anne-de-Bellevue, Que., Canada

Volume

1

fYear

1995

fDate

18-23 June 1995

Firstpage

140

Abstract

Intelsat V, VI and VII spacecrafts use two separate array fed C-band antennas to provide Hemi and Zone contoured beams. The number of elements in the feed array is very large (140 for Intelsat VI). Complex beam forming networks (BFN) are used to generate required amplitude and phase excitations of the feed elements. We assess the possible performance improvement of an Intelsat-type of spacecraft antenna if the usual constraint for frequency invariant BFN excitations is removed. The physically realizability of the BFN excitations is also discussed. The Hemi-1 antenna is selected as the subject of this investigation.

Keywords

microwave antennas; optimisation; reflector antenna feeds; reflector antennas; satellite antennas; C-band antennas; Hemi contoured beams; Hemi-1 antenna; Intelsat V spacecraft; Intelsat VI spacecraft; Intelsat VII spacecraft; Zone contoured beams; amplitude excitation; antenna optimization; array fed contoured beam antenna; beam forming networks; frequency variable excitations; performance improvement; phase excitation; spacecraft antenna; Antenna arrays; Bandwidth; Constraint optimization; Design optimization; Directional antennas; Feeds; Frequency; Packaging; Polarization; Space vehicles;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1995. AP-S. Digest

Conference_Location

Newport Beach, CA, USA

Print_ISBN

0-7803-2719-5

Type

conf

DOI

10.1109/APS.1995.529982

Filename

529982