Fast and Accurate Prediction of Antenna Reflection Coefficients in Planar Layered Media Environment via Generalized Scattering Matrix

The numerical algorithm for evaluating the reflection coefficient of an antenna in the presence of the planar layered medium is reformulated using the antenna's generalized scattering matrix (GSM). The interaction between the antenna and the layered medium is modeled through spherical-to-planar vector wave transformations, ensuring no approximations that could compromise computational accuracy. This theoretical framework significantly reduces algebraic complexity, resulting in a marked increase in the speed of antenna performance evaluation. Excluding the one-time preprocessing cost of obtaining the antenna's GSM in free space, the numerical evaluation speed of this method exceeds that of the commercial software FEKO by several orders of magnitude, while maintaining nearly identical accuracy.