Full wave analysis of periodic and random surface distortions on reflector antennas

The focus of this paper is to present full wave analysis of periodic and random surface distortions on reflector antennas. Three models of distortions are used - random distortion, one dimensional cosine and two dimension cosine distortion. Also, in order to compare results, reflector with ideally flat surface was used as referent model. In this paper, the distorted reflector surface points are approximated by summing two components: an undistorted (ideal) surface component and a surface error component. For each case, radiation patterns of the reflector are simulated and influence to main lobe and grating lobe is observed for reflector antennas up to 200 wavelengths in diameter by using an efficient MoM 3D solver.