A combined radioabsorber based on a ferrite layer and resistive square gratings

A radar absorbing structure shielding a metal plane in the form of a ferrite layer with a dielectric layer containing grids of resistive squares is considered. The problem of diffraction of a plane electromagnetic wave, normally incident on the structure, is solved. On the basis of the solution of the optimization problem, it is shown that in comparison with a simple ferrite layer, which is low-reflective only in the decimeter and meter wavelength ranges, the combined structure with a total thickness of less than 5 cm provides a small reflection in the region of centimeter waves.