An Efficient Asymptotic Extraction Approach for the Green´s Functions of Conformal Antennas in Multilayered Cylindrical Media

Asymptotic expressions are derived for the dyadic Green´s functions of antennas radiating in the presence of a multilayered cylinder, where analytic representation of the asymptotic expansion coefficients eliminates the computational cost of numerical evaluation. As a result, the asymptotic extraction technique has been applied only once for a large summation order. In addition, the Hankel function singularity encountered for source and evaluation points at the same radius has been eliminated using analytical integration.