EM scattering by an interior right-angled anisotropic impedance wedge illuminated at oblique incidence

The aim of this paper is to derive an approximate analytical solution for skew incidence scattering from an interior right-angled anisotropic impedance wedge. This is obtained by resorting to a perturbation technique based on the Sommerfeld-Maliuzhinets method, considering the perfectly conducting case as the unperturbed configuration. This approximate perturbative solution has been validated by analytically comparing the expressions obtained with the corresponding relationships presented by Senior (1973). The solution of Senior is again derived in the framework of a perturbative approach (the small parameter in both solutions consists of the normalized surface impedance), although making use of the two-dimensional Green´s function instead of the Sommerfeld-Maliuzhinets representation utilized here. In order to improve the accuracy, a third order term has been included in calculations in the present approach, at the cost of a slight increase in analytical and computational complexity.