Polarization Emancipated Ultrathin Metamaterial Absorber

摘要

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.