An ultra-thin dual-band polarization-independent metamaterial absorber for EMI/EMC applications

In this paper, an ultra-thin polarization-independent dual-band metamaterial absorber has been presented in microwave frequency regime. The unit cell structure is composed of tetra-arrow cave structure in the top layer imprinted on a grounded dielectric substrate. The geometrical parameters have been optimized in such a way that near-unity absorption takes place at two different frequency bands (C and X-bands). The proposed structure is polarization-insensitive as well as wide-angle absorptive (upto 60°) for both TE and TM polarizations. The structure is fabricated on FR4 substrate, and experimental results are in good agreement with simulated responses. The designed absorber is ultra-thin, compact and appears to be potentially instructive for various EMI/EMC applications.