Anik-D, Brasilsat and GSTAR shaped beam antennas

All three antennas considered provide frequency reuse capability, using overlapping gridded reflectors. Horn clusters with controlled excitation are employed to achieve the beam shaping. The Anik-D (1) satellite was launched in August 1982 and is currently in operation, replacing the Anik-A series of Canadian domestic satellites. The antenna is to provide orthogonally polarized transmit and receive shaped beams at 6/4 GHz for an all Canada coverage. The Brasilsat satellite antenna is designed to cover Brasil over the orbital range 60-70 deg west longitude. The present design meets all gain specifications for both horizontally polarized and vertically polarized antennas. the GSTAR communication antenna provides coverage over the contiguous U.S., Alaska, and Hawaii in the 12 GHz (downlink) and 14 GHz (uplink) bands.