Green's functions in layered media: imaginary axis integration and asymptotic behavior

Printed antennas and associated circuits have been extensively investigated in the last decades. This paper presents an efficient technique for evaluating Green's functions associated to layered media, when cast in the space domain as Sommerfeld integrals. The theoretical developments needed to set up the numerical algorithm throw a new light on the asymptotic behavior of these Green's functions for large transverse source-observer distances.