High-frequency approximations for electromagnetic field near a face of an impedance wedge

We employ the exact solution given by G.D. Maliuzhinets (see Sov. Phys. Doklady, vol.3, p.752-5, 1958) for the canonical problem of diffraction of a plane wave by an arbitrarily angled impedance wedge to derive asymptotic approximations to the field components in a region contiguous to a face of the wedge. The asymptotic solution accounts for terms of order (k/spl rho/)/sup -3/2/ (k is the wave number and /spl rho/ is the distance from the edge), is uniform with respect to observation and illumination aspects and includes the case of grazing illumination of a wedge face, which is known to be particularly difficult for high-frequency analysis (Uflmtsev's singularity).