Analysis and design of a waveguide matching crossed slot by the method of moments using numerical eigenmode basis functions

摘要

A matching crossed slot, which radiates all the residual power with circular polarization in a desired beam direction at the shorted end of a waveguide crossed slot array, is analyzed and designed by the method of moments (MoM). The eigenmode functions utilized as the basis functions for magnetic currents of the crossed slot in MoM are derived numerically by the edge-based finite element method. A good matching crossed slot has been designed at 11.85 GHz. The axial ratio is 0.46 dB in the desired direction. The reflection is suppressed below -15dB over a 5.1% bandwidth.