Abstract
In this paper, a wide-angle and ultra-wideband (UWB) metamaterial absorber (MA) consisting of cascaded graphite involute windmill blade (IWB) structures operating at the terahertz domain is proposed. The operating bandwidth of such an MA can be tuned by the incident angle and structural parameters of IWB. Via simulations of electric field distributions and power flow, the UWB absorption mechanism can be attributed to the strong interaction between multiple electric resonances. Simulation results report that the proposed MA can sustain a UWB absorption whose relative bandwidth reaches over 100% as the incident angle varies from 0° to 60° for both transverse electric and transverse magnetic modes, which provides a great potential value in the high-performance absorber.
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