Dual offset reflector multibeam antenna for international communications satellite applications

Author

Jorgensen, Rolf ; Balling, Peter ; English, William J.

Author_Institution

TICRA, Copenhagen Denmark

Volume

33

Issue

12

fYear

1985

fDate

12/1/1985 12:00:00 AM

Firstpage

1304

Lastpage

1312

Abstract

Dual offset reflector antenna systems offer exciting possibilities for achieving both low scan losses and low cross polarization in geosynchronous communications satellite antennas providing narrow ( $100 \\leq D/\\lambda \\leq 400$ ) and multiple beam frequency reuse coverages over an $18\\deg$ conical field of view. Novel geometrical configurations for the reflectors are characterized by simultaneously achieving: 1) blockage free apertures for all element beams within the $18\\deg$ conical field of view, 2) compatibility with large planar feed arrays, 3) additional degrees of design freedom by orientation and shaping of reflector surfaces for depolarization and scan loss optimization, and 4) large effective $f/D$ ratio achieved in compact and foldable geometries. A comparison of new front-fed offset Cassegrain (FFOC) and side-fed offset Cassegrain (SFOC) systems is made.

Keywords

Multibeam antennas; Offset reflector antennas; Reflector antennas, offset; Apertures; Artificial satellites; Feeds; Frequency; Helium; Oceans; Polarization; Reflector antennas; Satellite antennas; Space vehicles;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1985.1143523

Filename

1143523