Excitation of a Parallel Plate Waveguide by an Array of Rectangular Waveguides

Abstract

The problem of exciting a parallel plate waveguide by a linear array of rectangular waveguides is considered. Coupled integral equations are formulated for the aperture electric field at the junction. The integral equations are solved by the method of moments. Numerical results for the reflection coefficient as a function of scan angle are presented. Vertical and horizontal polarizations in the parallel plate guide are realized by TE10 and TE01 modes of excitation in the rectangular waveguides, respectively. E-plane and H-plane coupling between elements is presented. The method of moments results for a large finite array have been validated by comparing its reflection coefficients with corresponding results for an infinite array generated by the commercial finite element code, HFSS.