Accurate and efficient computation of the Green's tensor for stratified media

We present a technique for the computation of the Green's tensor in three-d imensional stratified media composed of an arbitrary number of layers with different permittivities and permeabilities (including metals with a comple x permittivity). The practical implementation of this technique is discusse d in detail. In particular, we show how to efficiently handle the singulari ties occurring in Sommerfeld integrals, by deforming the integration path i n the complex plane. Examples assess the accuracy of this approach and illu strate the physical properties of the Green's tensor, which represents the field radiated by three orthogonal dipoles embedded in the multilayered med ium.