Evaluation of Green's function integrals in conducting media

For seamless surface-based broadband simulation, it is important to explicitly model the interior of conducting materials in order to avoid ad-hoc mixing of surface and volume based formulations. This paper focuses on broadband computation of lossy medium scalar, vector, and gradient Green's function integrals for arbitrarily located sources and observers. We propose a polar-coordinate transformation and new mixed analytic and numerical quadrature for accurate evaluation of RWG function (S.M. Rao et al, IEEE Trans. on Ant. Prop., vol.30, p.409-418, 1982) based scalar, vector, and gradient Green's function integrals in lossy conducting media in a form more general than other existing methods. The presented technique is broadband and applicable to any distribution of source and testing function locations and orientations and to any lossy material.