A hybrid numerical technique to investigate the performances of offset reflector and matched feed

An effective hybrid numerical technique is developed to evaluate the performance of complete system of feed and reflector. The hybrid technique is formed by using the combination of mode matching (MM) and 2-D finite element method (FEM) for interior field analysis of horn, method of moment (MoM) solution for Kirchofs Hygens equation using Rao, Wilton and Gilsson (RWG) basis functions for open ended waveguide problem, and physical optics (PO) to evaluate the far field radiation pattern of the reflector. The performance of this technique is compared with simulated results of HFSS and close matche is obtained.