Design of shaped millimeter wave focus antenna with dual-reflector

A shaped scheme based on geometric optics for offset-fed dual-reflector focus antenna is presented. The main reflector is a shaped antenna based on conservation of energy along a ray tube, Snells law, uniform phase and equal path length. Only Snells law is imposed on the sub-reflector. Based on this design solution, theoretical analysis, numerical simulation and experimental test are carried out for a 110 cm dish baseline system with an angle of 20 between x axis and the beam. The experiment shows that at 95 GHz, the antenna has a well focusing through phase measurement with an angle of 20 between x axis and the beam.