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提出并设计了一种极化不敏感的柔性双阻带太赫兹超材料滤波器,并采用CST 2015仿真软件对该滤波器的结构进行仿真;为深入研究超材料滤波器的传输特性,分别对该超材料滤波器在2个谐振吸收峰处的电场强度和表面电流分布进行仿真;为验证仿真结果的正确性,采用微加工工艺制备了超材料滤波器样品,使用太赫兹时域光谱系统对其传输特性进行测试。仿真结果表明:该滤波器在0.131THz和0.182THz处获得了3dB带宽分别为15GHz和10GHz的2个阻带,并且在这2个谐振频率点的传输系数S21可以达到-43.56dB和-48.76dB,表现出了良好的阻带特性;测试结果与仿真结果比较吻合。
A polarization-insensitive flexible double-stopband THz metamaterial filter was proposed and designed. The structure of this filter was simulated by CST 2015 simulation software. In order to further study the transmission characteristics of the metamaterial filter, In order to verify the correctness of the simulation results, a metamaterial filter sample was prepared by using a micro-fabrication process and a terahertz time-domain spectroscopy system was used to measure the intensity and the surface current distribution of the metamaterial filter at two resonance absorption peaks. Its transmission characteristics are tested. The simulation results show that the proposed filter has two stopbands with 3dB bandwidth of 15GHz and 10GHz respectively at 0.131THz and 0.182THz, and the transmission coefficient S21 at these two resonance frequencies can reach -43.56dB and -48.76dB , Showing a good stop band characteristics; test results and simulation results are in good agreement.