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    • 摘要: 本文设计了工作在第二个大气窗口(3 μm~5 μm)和第三个大气窗口(8 μm~14 μm)的双频段FSS。该FSS为双屏结构,由六边形金属网格和六边形谐振环阵列组合而成。仿真结果表明,该FSS在两个大气窗口的平均透过率低于5%,且对不同角度入射的电磁波具有良好的角度稳定性。分析了结构主要尺寸参数对传输特性的影响,结果表明,调整六边形谐振环的单元尺寸能够有效调节3 μm~5 μm波段范围内-10 dB阻带的带宽,增大金属网格的单元尺寸会使得8 μm~14 μm波段范围内的阻带向长波方向移动。

       

      Abstract: A dual-band frequency selective surface (FSS) with double screen was designed to cover the mid-infrared atmospheric window (3 μm~5 μm) and the far-infrared atmospheric window (8 μm~14 μm). This structure is composed of hexagonal metallic mesh and hexagonal resonant ring array. Simulation results show that the average transmission of FSS in atmospheric window is lower than 5%, and this structure is insensitive to the incident angle. The effect of the parameters on transmission properties was analyzed. The results show that adjusting the size of hexagonal ring structure can effectively adjust the -10 dB stopband bandwidth in 3 μm~5 μm, and increasing the size of metallic mesh can move the stopband in 8 μm~14 μm to long wave direction.