Cassegrain dual reflector antenna for UWB high power microwave

A Cassegrain dual reflector antenna which consists of a TEM horn, a hyperbolical subreflector and a parabolic reflector, was developed to radiate high power UWB microwave. The Cassegrain dual reflector is formed by a 4.5 m parabolic reflector (the ratio of focal length to diameter is 0.4) and a 70 cm hyperbolical subreflector (focal length is 22.5 cm). The size and the F/D parameter of the parabolic single reflector antenna in experiment are the same as that of the dual reflector antenna. The gain of the Cassegrain dual reflector antenna and the parabolic single reflector antenna were simulated by FEKO program. The gain of the Cassegrain dual reflector is 1~2 dB higher than that of the parabolic single reflector at the frequency band between 0.2 GHz to 1.0 GHz, while the gain is 1~2 dB low