Low-Sidelobe Microwave Reflector Antennas and Dichroic Plate

The figure depicts the basic geometric features of an antenna system designed to be part of a miniature atmosphere-sounding passive microwave radiometer to be flown at high altitude aboard a remotely piloted aircraft. The system includes (1) a scanning flat reflector; (2) a dichroic plate; and (3) three low-sidelobe, offset-paraboloidal reflector antennas for reception in three frequency bands that include, and are denoted by, nominal frequencies of 55, 118, and 183 GHz, respectively.