Composite parabola dual beam antenna with a phase compensation subreflector

The author describes a dual-beam antenna, using a composite parabola with a phase compensation subreflector, which can simultaneously access two adjacent geostationary satellites. A dual-beam antenna is preferable for a satellite ground station, since the main reflector is smaller than two single-beam antennas and a minimum number of reflectors is required. An experiment was performed with a 1.27-m diameter antenna, operating in the 39/35-GHz frequency bands. The experimental data, which agreed well with the calculated data, demonstrated the validity of the design procedure and analyses. The proposed antenna uses a single main reflector subreflector configuration with the main reflector diameter only 5% larger than that of a single-beam antenna. The composite dual-beam antenna is also capable of tracking the drift of a satellite in geostationary orbit.<>