CANADIAN JOURNAL OF PHYSICS, cilt.80, sa.8, ss.893-909, 2002 (SCI-Expanded)
The problem of diffraction of plane waves by a set of three parallel half-planes with different surface impedances on upper and lower faces where the one in the middle is placed in the opposite direction, is solved by the mode-matching method where available, and by Fourier-transform technique elsewhere. The solution includes two independent Wiener-Hopf equations each involving an infinite number of expansion coefficients that satisfy an infinite system of linear algebraic equations.