Title :
Frequency-scanning grating-reflector antenna for multibeam satellite communications
Author :
Johansson, F. Stefan
Author_Institution :
Saab Ericsson Space AB, Goteborg, Sweden
fDate :
10/1/1992 12:00:00 AM
Abstract :
The analysis and design of a circularly polarized frequency-scanning grating-reflector antenna is presented. The antenna is intended for a multibeam satellite communication system, covering 3.1° north-south and 7.2° east-west with 25 spot beams. Frequency scanning is used for the north-south coverage, while the east-west coverage is obtained by the use of a cluster feed. The grating reflector consists of a planar frequency-scanned reflection grating with a quasi-periodic lattice geometry. The frequency-scanned grating reflects the incident field into a diffracted field composed of the first-order diffracted grating lobe. A focus-feed position for the diffracted field is obtained by a proper design of the quasi-periodic lattice geometry. Design principles for the planar grating-reflector antenna are presented together with an analysis method for predicting copolar and cross-polar radiation patterns. The analysis method is verified by experimental results
Keywords :
antenna feeders; antenna radiation patterns; reflector antennas; satellite antennas; scanning antennas; 19.7 to 20.2 GHz; SHF; circularly polarized frequency-scanning grating-reflector antenna; cluster feed; copolar radiation patterns; cross-polar radiation patterns; diffracted field; east-west coverage; first-order lobe; focus-feed position; incident field; multibeam satellite communication; north-south coverage; planar frequency-scanned reflection grating; quasi-periodic lattice geometry; spot beams; Diffraction gratings; Feeds; Frequency; Geometry; Lattices; Optical reflection; Pattern analysis; Polarization; Satellite antennas; Satellite communication;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
