Closed-Form Evaluation of Michalski-Zheng's Mixed Potential Green's Function in Unbounded Layered Media Using the Spectral Differential Equation Approximation Method

An extension of the Spectral Differential Equation Approximation Method (SDEAM) to the computation of mixed-potential Green's function components in unbounded layered media is proposed. Previous formulations of the SDEAM for mixed-potential Michalski-Zheng's Green's functions components were developed for shielded media only. The generalized formulation developed here is suitable for use with planar 2.5D Method of Moments (MoM) solutions of mixed-potential integral equations for metal, dielectric, and composite metal-dielectric objects embedded in general layered media.