Equivalent current formulation for an impedance wedge of arbitrary included angle

Equivalent currents are presented for computing the scattering by a finite-length impedance wedge of arbitrary angle. These are based on an improved version of an approximate dyadic diffraction coefficient which was constructed from the known skew incidence half plane solution. Exact skew incidence diffraction coefficients for impedance wedges are only available for three internal wedge angles, and the derived approximate diffraction coefficient has been shown to agree with these specialized analytical solutions before its use in this application. The derived equivalent currents have been implemented in a standard general-purpose physical theory of diffraction, code and results have been obtained which demonstrate the accuracy of the formulation for a number of different impedance structures. These include typical shapes such as plates, finite-length cones, and cylinders which have been partially or fully coated.<>