Shaping Design of Side-fed Ofiset Cassegrain Re∞ector Antennas

The purpose of this paper is to improve the scanning performance of the Side- fed Ofiset Cassegrain (SFOC) re∞ector antenna by adjusting its re∞ectors' shape. Firstly the ray-tracing technique is employed to obtain the path lengths and directions of the outgoing rays emanated from two specifled feeds. Then the path length and direction errors of these rays are minimized by adjusting the antenna's main- and sub-re∞ector surfaces. An optimization example of the SFOC antenna is provided for improving its wide-angle scanning performance, and the validity of the method presented is demonstrated.