New closed form expressions for layered media green’s functions

The rational function fitting method (RFFM) is a powerful alternative to discrete complex images (DCIM) in the derivation of closed-form expressions of spatial domain Greenpsilas functions (SDGF) for multilayered media. However, former implementations of that method are inaccurate when the far field is dominated by the continuous spectrum instead of by surface waves. In this paper the authors modify the original implementation of RFFM in order to overcome that problem.