Practical Design of Radiating Part of Post-Wall Waveguide-Fed Parallel Plate Slot Array Antenna by Method of Moments

A practical design of a radiating part of a post-wall waveguide-fed parallel plate slot array antenna is presented. The radiating part of the antenna is a parallel plate waveguide with an array of radiating slot pairs. The slot pairs are designed by the method of moments (MoM). In the MoM analysis, unknown equivalent magnetic currents on slot apertures are expanded with entire-domain sinusoidal basis functions. The dependence of accuracy and computation time on the number of basis functions is evaluated. The MoM with an appropriate number of basis functions enables accurate and fast analyses. As an example, an efficient design of an array consisting of 21 slot pairs in the longitudinal direction of the parallel plate waveguide is demonstrated.