Plane wave diffraction by a slit in a material screen

The analysis of the scattering by a slit in an infinite screen is an important subject in electromagnetic theory and radar cross section (RCS) studies. A number of scientists have analyzed the slit diffraction problem using various analytical and numerical methods [1, 2]. In [3, 4], we have analyzed the plane wave diffraction by a thin material strip for H and E polarizations using the Wiener-Hopf technique together with approximate boundary conditions, and obtained a rigorous, high-frequency asymptotic solution. In particular, it has been shown that our final solution is valid for the case where the strip width is not too small compared with the wavelength. In this paper, we shall consider a slit in an infinite material screen, and analyze the H-polarized plane wave diffraction with the aid of the Wiener-Hopf technique by following a procedure similar to that employed in our previous papers [3, 4].