A numerical approach to finding the diffraction coefficient for surfaces that are finitely-conducting and locally-rough

A theoretically correct numerical approach for calculating the diffraction coefficient for finitely conducting locally rough surfaces is presented. It is shown that the solution for the fields diffracted by a two-dimensional wedge can be derived by introducing a line of Huygen sources above the wedge. A preliminary comparison of results obtained using this approach validates an earlier heuristic modification to the GTD (geometrical theory of diffraction) to account for lossy, locally rough wedge diffraction.<>