Multiple-beam Cassegrainian antenna

摘要

A multiple-beam Cassegrainian antenna configuration is disclosed which supports a plurality of angularly displaced but well-isolated beams and exhibits essentially zero aperture blockage. A plurality of feed horns are clustered about the on-axis focal point of an offset Cassegrainian antenna in which the subreflector is displaced from the aperture to avoid blockage. This subreflector is sized and shaped to accommodate the plurality of beams, and the feeds are individually aimed toward the subreflector so that all of the beam centers impinge upon the common effective center of the main reflector. The antenna is well-suited for earth stations and satellites.