Scattering by resistive strips


  • Thomas B. A. Senior


For resistive strips of large electrical width kw illuminated by E- or H-polarized plane waves the geometrical theory of diffraction is used to obtain expressions for the far zone scattered field through second-order terms, valid for directions of incidence and observation away from grazing. The results are then cast as products of functions analogous to those appearing in the known (uniform) expansions for perfectly conducting strips. Each function involves the current on the corresponding half plane, and by invoking this connection, far field expressions are produced which are uniform in angle. In particular, for E polarization the backscattered field at edge-on incidence is shown to consist of two terms, each of which is expressible in terms of the half-plane current, and for all resistivities the resulting values of the field are in excellent agreement with those found by numerical solution of the integral equation, even for kw as small as unity.