Efficient moment method analysis of a rectilinear edge-slot radiator in rectangular waveguide

A moment method (MoM) model of a rectilinear edge slot in rectangular waveg uide is developed using entire domain trigonometric basis functions. This m odel has been found to provide an optimum trade-off between computational e fficiency and accuracy. The intention behind the analysis is to provide an accurate, computationally fast model for the inclined edge slot radiator fo r incorporation into an array synthesis program. The basis functions for th e 'three-dimensional' slot geometries involved in the analysis are generate d using a simple transmission line representation of the slot field distrib ution to identify the resonant 'slot modes'. The results obtained are compa red with alternative modelling approaches to this problem, based on finite element method and finite difference time domain techniques, and also with measurement.