Generalized Solver Hybridization Using Equivalence Principle Algorithm

The simulation of antennas often necessitates modeling the effect of nearby electrically large structures. Such structures are often unsuitable for modeling with the same technique as used on the antenna because of the prohibitive required unknown count. First-principles models of antennas (or other key features) must then be augmented with approximate models of the larger auxiliary structures, usually with high-frequency asymptotic models. The surface equivalence principle is applied to linear-media multiple scattering without regard to the formulations used for each contained domain. A Schur complement is then applied to convert the homogeneous medium equivalent problem into a inhomogeneous medium equivalent problem. The Schur complement form supports application of approximate models and makes the scattering physics plain. The results are provided for two cases modeled with the equivalence principle algorithm (EPA) hybridized with physical optics (PO) approximation.