Efficient and versatile analysis of microwave structures by combined mode matching and finite difference methods

A combined mode-matching (MM) and finite-difference (FD) method is proposed for the analysis of passive microwave structures. By segmenting the structure into regions of separable geometries and irregular regions where MM and FD, respectively, are applied, the respective generalized admittance matrix (GAM) representations are obtained. This makes it possible to take advantage of the high numerical efficiency of the MM method as well as of the versatility of the FD method. The approach can be applied to both conventional (e.g. waveguide) as well as integrated microwave circuits.<>