DIFFRACTION BY A RESISTIVE SHEET ATTACHED TO A 2-SIDED IMPEDANCE PLANE

The diffraction by a resistive sheet attached to a two-sided impedance plane, made up by perfectly electric conducting and impedance half-pl anes, is presented. An E-plane wave normally illuminates this structur e, therefore, the problem is a two dimensional one. By using Sommerfel d-Maliuzhinets' method, the problem is reduced to the solution of a co upled system of functional equations for two spectral functions corres ponding to the two spatial regions defined by the resistive sheet. By eliminating either of the spectral functions, a second-order differenc e equation with variable 2 pi-periodic coefficients is obtained for th e remaining one. A general method of constructing a single-valued solu tion of this second-order difference equation is presented based on th e Fourier transform. It is shown that the obtained single-valued merom orphic spectral function satisfies the edge condition, pole requiremen t and the radiation condition.