Backscattering by loaded and unloaded dihedral corners

An accurate mathematical model for the backscattering from a loaded dihedral corner has been developed. Such a model employs a generalization of physical optics (PO) to loaded surfaces which takes into account the lighting of each face by the rays diffracted by the edge of the other one. The inclusion of the currents due to such diffracted fields in the PO current distribution has been found relevant in order to improve the accuracy of the solution. Moreover the solution is uniform with respect to the loading impedance; as it coincides with the previously obtained solution for the perfectly conducting case, when the loading impedance approaches zero.