PLANE-WAVE DIFFRACTION BY A WIDE SLIT IN A THICK IMPEDANCE SCREEN

A uniform asymptotic high-frequency solution is developed for the prob lem of diffraction of plane waves by a slit in an impedance screen of finite thickness. By using the Fourier transform technique the boundar y-value problem is formulated into a pair of simultaneous modified Wie ner-Hopf equations of the third kind which are decoupled and solved ap proximately. Several numerical results illustrating the effects of the surface impedances, slit width and slit thickness on the diffraction phenomenon are presented.