Novel Dichroic Subreflector Design for Cassegrain Antennas

Novel subreflector design for Dual Band Cassegrain Antenna systems was proposed in this paper. Proposed Frequency Selective subreflector, reflecting frequencies in X Band and transmitting in S-Band was designed and manufactured using the Selective Laser Sintering method. Tests were made both on the manufactured unit and on a complete antenna system using GEO satellite beacon signals. It was shown that total antenna efficiencies in both frequency bands using Frequency Selective Surface dichroic subreflector were more than 65 %.