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基于多个圆环嵌套结构单元,设计、加工与测试了一种对偏振无依赖以及大角度入射稳定的三波段超材料宽带带通滤波器(BPF)。仿真结果表明该滤波器存在三个通带,中心频率分别为7.22,10.10,14.46GHz,3dB相对带宽分别为17.5%,20.2%和17.4%,中心频率处透射率分别为-0.85dB,-0.69dB和-1.73dB。单元结构具有旋转对称性,使得该滤波器对电磁波偏振不敏感,并且在入射角达到40°时,三个波段依然维持较好的稳定性。通过监测谐振频点处的表面电流分布情况,分析了三波段滤波的物理机理。这种带通滤波器具有多波段滤波、偏振无依赖以及大角度入射稳定等特性,有望在多频谱成像技术、信息通信等领域发挥一定的作用。
A three-band metamaterial wideband band-pass filter (BPF) with no polarization dependence and large angle of incidence stability was designed, fabricated and tested based on multiple annular nested structure units. The simulation results show that the filter has three passbands, the center frequencies are 7.22,10.10,14.46GHz respectively, the relative bandwidths of 3dB are 17.5%, 20.2% and 17.4% respectively, and the transmissivities at the center frequency are -0.85dB and -0.69 respectively dB and -1.73dB. The unit structure has rotational symmetry so that the filter is insensitive to the polarization of the electromagnetic wave and the three wavebands still maintain good stability when the incident angle reaches 40 °. By monitoring the surface current distribution at resonant frequency, the physical mechanism of three-band filtering is analyzed. This band-pass filter with multi-band filtering, polarization-independent and large-angle incident stability and other characteristics, is expected to multi-spectral imaging technology, information and communication and other fields play a role.