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Abstract
An exact series solution for the scattering from a concaved wedge with longitudinal corrugations is formulated for TM plane wave using the radial mode-matching technique. The scattered and guided fields are represented in terms of an infinite series of radial modes with unknown coefficients. By applying the appropriate boundary conditions, the coefficients of the scattered field are obtained. The diffraction coefficient of a concaved wedge with longitudinal corrugations is subsequently derived from the scattered field.