HIGH-FREQUENCY BACKSCATTERING FROM AN ABSORBING INFINITE STRIP WITH ARBITRARY FACE IMPEDANCES

Approximate expressions are derived for the high-frequency electromagnetic backscattering from an absorbing infinite strip on which an impedance boundary condition is imposed. Each face of the strip is assumed to possess an arbitrary constant surface impedance not necessarily equal to that of the other face. The problem is treated by a method of successive approximations based on known half-plane solutions; secondary (and in some cases, tertiary) diffraction effects are thereby included. Particularly important is the special case of a perfectly-conducting strip coated on one side with thin layers of highly refractive absorbing materials. Some experimental results of backscattering from an absorber-coated rectangular plate are presented and discussed in the light of the theoretical model.