A Generalized Singularity Subtraction Method for Evaluating Layered Medium Green's Functions

A novel spectral-domain singularity subtraction technique for accelerating the convergence of Sommerfeld integral tails is proposed for planar stratified media that include a perfect electrically conducting layer. Numerical results show that the extension avoids catastrophic cancellation in the spatial domain between the analytically computed and the numerically integrated terms, yields a rapidly decaying spectral tail, and enables accurate calculation of the Green's functions.