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selective surfaces (FSSs) have been successfully used in constructing microwave
absorbers 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 investigated with a structure similar to that of the Salisbury
screen except that the resistive sheet is replaced 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 sample 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.