三波段超材料宽带带通滤波器的设计及实验研究

发布时间：2018-07-04 09:34

本文选题：光学器件 + 带通滤波器　；参考：《光学学报》2017年06期

【摘要】：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。
[Abstract]:A three-band ultra-material wideband band-pass filter (BPF) is designed, fabricated and tested based on several ring nested elements, which is polarization independent and stable at large angle. The simulation results show that there are three passbands in the filter, and the relative bandwidth of the central frequency is 7.22 ~ 10.10 ~ 14.46 GHz ~ (3 dB) and the relative bandwidth is 17.5% and 17.4 dB, respectively. The transmittance at the center frequency is -0.85 dB ~ -0.69 dB and -1.73 dB, respectively. The cell structure has rotational symmetry, which makes the filter insensitive to the polarization of electromagnetic wave, and the stability of the three bands is still good when the incident angle reaches 40 掳. The physical mechanism of three-band filter is analyzed by monitoring the surface current distribution at resonance frequency point. The band-pass filter has the characteristics of multi-band filtering, polarization independent and stable incidence at large angles, which is expected to play a role in multi-spectrum imaging technology, information communication and other fields.
【作者单位】：中国矿业大学物理学院;
【基金】：国家自然科学基金(61372048,11504418) 中央高校基本科研业务费项目(2013QNA34,2013QNA39) 大学生创新项目(DC201637)
【分类号】：TN713.5

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