A GENERALIZED UNIFORM GEOMETRICAL-THEORY OF DIFFRACTION RAY SOLUTION FOR THE DIFFRACTION BY A WEDGE WITH CONVEX FACES

An approximate asymptotic high-frequency solution is obtained for the electromagnetic wave diffraction by a wedge with convex faces and a mo derate wedge angle. The present solution properly includes the edge-ex cited surface ray effect and can predict the transition between the sp ace ray and the surface ray. This solution is uniform across the vario us ray shadow boundaries even when the transition regions associated w ith these ray shadow boundaries overlap and is expressed in the simple format of the geometrical theory of diffraction. The ansatz for the p resent solution is based on a uniform solution for the scattering from a curved screen obtained earlier by C.W. Chuang and M.C. Liang, used in conjunction with an asymptotic matching technique. Numerical result s based on the present uniform geometrical theory of diffraction solut ion are found to be in excellent agreement with those based on an inde pendent moment method solution of the exact integral equation.