Title :
A high performance circularly polarized feed array for satellite communication antennas
Author :
Rao, K. Sudhakar ; Kopal, Joseph ; Tang, Minh Q. ; Gupta, Shyam G.
Author_Institution :
Spar Aerosp. Ltd., Ste. Anne de Bellevue, Que., Canada
Abstract :
The authors present breadboard results of a C-band circularly polarized feed array which has developed as part of the proof of concept (POC) antenna for INTELSAT VII coverage requirements. The feed array consists of 12 cup-dipole radiating elements arranged in a triangular grid. Each element is fed with a 3-dB hybrid coupler (to general dual circular polarization) and a TEM-line beam-forming network. The feed array illuminates a solid offset reflector antenna with a projected circular aperture with a diameter of 82 in. and a focal length of 76 in. Measured results of the feed array demonstrate that an axial ratio of less than 0.3 dB has been achieved over a 10% bandwidth. It is also shown that the secondary patterns of the POC antenna are in good agreement with the computed contours.<>
Keywords :
antenna feeders; antenna radiation patterns; dipole antennas; microwave antenna arrays; satellite antennas; C-band; INTELSAT VII; POC antenna; TEM-line beam-forming network; circularly polarized feed array; cup-dipole radiating elements; hybrid coupler; projected circular aperture; proof of concept antenna; satellite communication antennas; secondary patterns; solid offset reflector antenna; triangular grid; Antenna arrays; Antenna feeds; Antenna measurements; Aperture antennas; Bandwidth; Optical coupling; Polarization; Reflector antennas; Satellites; Solids;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1989. AP-S. Digest
Conference_Location :
San Jose, CA, USA
DOI :
10.1109/APS.1989.134983
