Acoustic diffraction of a plane wave by two staggered parallel soft or rigid strips

Abstract

We discuss here the diffraction of a normally incident plane acoustic wave by two equal, staggered, parallel, perfectly soft or rigid infinite strips. In each case, expressions are obtained for the first few terms of the series for the farfield amplitude and the scattering cross section when the wave length is much larger than the distance between the outer edges of the strips and the distance between the strips is large. By taking appropriate limits, the corresponding results are derived for two equal, parallel, perfectly soft or rigid infinite strips lying exactly opposite to each other. Numerical calculations of the physical quantities of interest are presented graphically.