Polarization Emancipated Ultrathin Metamaterial Absorber

Abstract

Through this paper, we propose quad-band electromagnetic wave metamaterial absorber structure consist of square rings resonators arranged in two-dimensional periodic array with a metallic ground plane. Under normal incidence this structure manifests four sharp peak absorptions at 3.75, 5.05, 7.35 and 8.96 GHz with pinnacle absorptivity of94.28, 99.67, 99.98 and 99.90% respectively. This structure with four-fold rotational symmetry in design provides nearly 100% absorption for all angle of polarization. Moreover, this outcome is polarization Emancipated, which manifest aloft absorption (more than 90%) for oblique incident angles till 45°. Corresponding to the highest frequency the absorber is ultra-thin and uses commercially available FR-4 as substrate. The designed quad-band absorber can be employed in innumerable feasible execution like thermal emitters, sensors, receivers, shielding, optical organization, radar signal absorption, forbid drugs and many communication utilizations. It can be easily manufactured with simple PCB manufacturing techniques.