Design and Measurement of Microwave Absorbers Comprising Resistive Frequency Selective Surfaces

Frequency selective surfaces (FSSs) have been successfully used in constructing microwave ab-sorbers which demonstrate the ability of modifying and improving its absorbing performances. In this paper, microwave absorber based on ferromagnetic nano-films has been proposed and inves-tigated with a structure similar to that of the Salisbury screen except that the resistive sheet is re-placed by FSS of square patch array of the nano-film. We have explored the FSS absorber from three aspects: equivalent circuit model, electromagnetic full-wave simulation and the actual sam-ple measurement. By carefully tuning the patch size, the thickness of the dielectric spacer and the specification of the ferromagnetic nano-film, we obtain the optimized performance of broadband microwave absorbing. Due to the light weight of the nano-films, the proposed absorbers can achieve an ultra-low surface density less than 0.25 kg/m2