W band axially displaced monopulse dual‐reflector antenna for inter‐satellite communications

An axially displaced monopulse dual‐reflector antenna operating at W band is proposed in this study. The antenna configuration consists of a hyperboloid as the subreflector, a combination of series of paraboloids with different focal length as the main reflector and a low‐loss sum‐and‐difference network, which is based on waveguide magic Ts and bent waveguides. Compared with traditional dual‐reflector antenna, axial size and weight of this novel antenna can be reduced to a certain extent. Measured results show that the gain is 40.1 dBi, the sidelobe is <−19.7 dB and the null‐depth is <−27.7 dB at the central frequency. The radiation patterns remain almost the same in the bandwidth. It is demonstrated that this antenna exhibits good radiation performances and is suitable for inter‐satellite systems.