Wide-Angle and Polarization Insensitive Dual-Band Metamaterial Absorber

This paper presents a single layer wide-angle and polarization insensitive compact metamaterial absorber for dual- band (C- and X- bands) operation. The unit cell of the proposed absorber is made up of two modified concentric circular rings printed on a grounded dielectric substrate. The surface power loss distribution on the unit cell confirms the dual-band nature. A planar absorber fabricated with 25x25 unit cells is tested for its absorption characteristics and found to exhibit more than 99% absorptivity at both 5.2 GHz and 10.4 GHz frequency bands. The proposed dual-band absorber maintains its absorptivity for various polarization angles and wide-angles of incidence.