Ultra-thin dual-band polarization-insensitive metamaterial absorber for C-band applications

Abstract

This paper presents an ultra-thin dual-band polarization-insensitive metamaterial absorber for C-band applications. The proposed structure comprises of a square loop and a modified split ring resonator on the top surface of a metal grounded dielectric substrate. The designed absorber offers low profile with a thickness of λ0/56 and λ0/49at 5.4 GHz and 6.1 GHz, respectively, where λ0 is free space wavelength. The proposed structure is insensitive towards variations in angle of polarization due to symmetrical geometry. It also offers stable response under oblique incidence for both TE and TM polarization up to 60°. Finally, the proposed structure has been fabricated and experimental results are in good agreement with simulation results under normal as well as oblique incidence.