Cross-polarization performance of the RCA SATCOM frequency reuse antenna

The RCA Satcom antenna is described with reference to its cross-polarization performance. A technique of achieving high cross-polarization isolation in excess of 33dB anywhere in the coverage of an beam has been developed using pairs of reflectors with an overlapping geometry. The technique allows accomodation of multiple linearly-polarized reflectors within the confines of the Delta 3914 launch vehicle shroud. Measured data both on the antenna test range and in orbit has confirmed the approach. In-orbit whole-system cross-polarization isolations of greater than 34 dB between adjacent channels have been measured on the two-way New York - Los Angeles link.