Broadband with enhanced oblique incidence metamaterial absorber

Abstract

In this paper, we present a broadband metamaterial absorber with excellent performances of oblique incidence and polarization insensitivity for enhancing the absorptance of electromagnetic waves at oblique incidence. Simulated results show that absorptance is larger than 0.9 in 1.61-4.45 GHz with the full width half maximum is 122.44%, and absorptance can be maintained stably as the incidence angle increases to 45° both in the case of transverse electric and transverse magnetic waves. The simulated results are successfully verified by microwave experiment in the anechoic chamber. The physics of absorption are revealed by the electric and magnetic fields energy distribution. We believe that the proposed absorber has many promising applications in electromagnetic stealth and energy harvesting.