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.

在本文中，提出了由在太赫兹域工作的级联石墨渐开线风车叶片（IWB）结构组成的广角和超宽带（UWB）超材料吸收器（MA）。可以通过IWB的入射角和结构参数来调整这种MA的工作带宽。通过电场分布和功率流的模拟，UWB吸收机制可归因于多个电子共振之间的强相互作用。仿真结果表明，对于横向电磁模式和横向电磁模式，当入射角从0到60变化时，所提出的MA都可以维持UWB吸收，其相对带宽达到100％以上，这为高性能吸收器提供了巨大的潜力。