Efficient evaluation of the half-space Green's function for fast-multipole scattering models

There has recently been significant interest in the method-of-moments (MOM) and fast multipole method (FMM) for the analysis of scattering from targets in the presence of a lossy dielectric half space (soil). It is desirable to make the analysis of scattering from such a target consistent with use of the free-space Green's function, to exploit previously developed free-space scattering models, and for compatibility with the FMM. In this paper, we present a new and simple formulation for Green's-function evaluation, which is shown to yield efficient and highly accurate scattering results. © 2001 John Wiley & Sons, Inc.