Title :
A dichroic subreflector for a communication satellite
Author :
Ingvarson, Per ; Johansson, F. Stefan ; Pettersson, Lars E.
Author_Institution :
Ericsson Radar Electron. AB, Molndal, Sweden
Abstract :
The authors present results of a study involving the design, manufacturing, and test of a large (1.1-m) dichroic subreflector for an offset Cassegrain reflector antenna. The primary focus feed operates at 10.7-11.7 GHz, and the secondary feed operates at 18.1-20.2 GHz, both with linear orthogonal polarizations. A preliminary design of the dichroic structure using an equivalent circuit approach showed that, given the desired closeness of the transmission and reflection bands, double-layer frequency selective surfaces with single resonant elements were the most promising configuration. Two layers of crossed dipoles with an interlayer distance of about 5 mm were selected. Results for electrical performance tests are presented.<>
Keywords :
antenna reflectors; dichroism; microwave antennas; satellite antennas; 1.1 m; 10.7 to 11.7 GHz; 18.1 to 20.2 GHz; SHF; communication satellite; crossed dipoles; design; dichroic structure; dichroic subreflector; double-layer frequency selective surfaces; electrical performance; equivalent circuit; interlayer distance; linear orthogonal polarizations; manufacturing; primary focus feed; reflection bands; resonant elements; secondary feed; test; transmission band; Artificial satellites; Circuit testing; Equivalent circuits; Feeds; Frequency selective surfaces; Manufacturing; Polarization; Reflection; Reflector antennas; Resonance;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1989. AP-S. Digest
Conference_Location :
San Jose, CA, USA
DOI :
10.1109/APS.1989.134889
