Full wave analysis of image lines

Aim of this work is the analysis of natural modes of image lines. By introducing equivalent surface electric and magnetic currents, the boundary integral equations are obtained. The Galerkin method in the spectral domain with expansion functions factorizing the dominant edge behaviors of the unknowns is applied to reduce the system of integral equations to symmetric infinite-matrix equations the elements of which are single integrals that can be efficiently evaluated. In such a way the integral operator is discretized and analytically regularized thus leading to a fast converging method.