Asymptotic diffraction by a double wedge

Following an approximate technique by Karp and Russek for the diffraction by a wide slit, an asymptotic expression for the far diffracted field due to a plane wave incident on two semi-infinite wedges is derived in terms of the unperturbed field due to the two wedges in isolation plus an interaction term due to an equivalent inhomogeneous line source at each edge. Numerical results for the diffraction pattern, transmission coefficient, equivalent line source intensity and interaction term are presented for wide as well as narrow double wedges and are in good agreement with previous results by Teague and Zitron as well as Keller and Mohsen for the special case of diffraction by a slit.