A FAST INTEGRAL-EQUATION TECHNIQUE FOR SHIELDED PLANAR CIRCUITS DEFINED ON NONUNIFORM MESHES

In this contribution, the groundwork is laid out for the realization o f efficient integral-equation/moment-method techniques, with arbitrary types of basis functions, for the computer-aided design (CAD) of geom etrically complex packaged microwave and millimeter-wave integrated ci rcuits (MMIC's). The proposed methodology is based on an accelerated e valuation of the Green's functions in a shielded rectangular cavity. S ince the acceleration procedure is introduced at the Green's function level, it becomes possible to construct efficient shielded moment meth od techniques with arbitrary types of basis-functions. As an example, a Method of Moments (MoM) is implemented based on the mixed potential integral equation formulation with a rectangular, but nonuniform and n onfixed, mesh. The entire procedure can be extended to multilayer subs trates.