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摘要:
本文基于对称的类H型结构设计了一种超材料太赫兹带阻滤波器，这种H型结构的连续金属臂可以流通电流，能为拓展超材料滤波器在电子应用领域提供有效参考。利用电磁仿真软件CST Microwave Studio 2021研究了该滤波器的滤波特性，通过改变H型双臂间距臂长、周期长度、双H间距离等，确定了滤波器的几何参数。结果表明，该结构可实现偏振选择的功能，在
y 偏振条件下，滤波器在0.2~2.3 THz范围内没有明显谐振峰，但透过率范围在−15到−3 dB之间。而在x 偏振条件下，可在中心频率1.34 THz处可获得FWHM带宽为0.15 THz的一个阻带，传输参数约为−30 dB。为了验证仿真结果，采用微加工工艺制备了超材料滤波器样品，使用透射式太赫兹时域光谱系统对样品进行测试，测试结果与仿真结果吻合较好。Abstract:In this paper, a metamaterial terahertz band-stop filter is designed based on a symmetrical H-type structure. The continuous metal arm of this H-type structure can flow current, which can provide an effective reference for expanding the application of metamaterial filters in the field of electronics. Using electromagnetic simulation software CST Microwave Studio 2021, the filtering characteristics of the filter were studied, and The geometric parameters of the filter are determined by changing the arm length, period length and double H distance. The results show that the structure can realize the function of polarization selection. Under the condition of y polarization, the filter has no obvious resonance peak in the range of 0.2−2.3 THz, but the transmittance ranges from −15 dB to −3 dB. Under the X-polarization condition, a stopband of 0.15 THz FWHM bandwidth can be obtained at the center frequency of 1.34 THz, and the transmission parameter is about −30 dB. In order to verify the simulation results, the sample of metamaterial filter was prepared by micromachining technology, and the sample was tested by transmissed-terahertz time-domain spectroscopy system. The test results were in good agreement with the simulation results.
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Key words:
- terahertz /
- metamaterial /
- H-type structure /
- band-stop filter
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图 2 (a)透射系数仿真图 (b) 入射波沿x轴偏转位置和透射共振峰位置(f= 1.34 THz)处的电流分布
Figure 2. (a) Transmission coefficient simulation diagram (b) The current distribution of the incident wave at the x-axis deflection position and the transmission formant position (f= 1.34 THz)
图 3 (a) 模拟改变内侧臂长度b下的传输特性(b) 实线：模拟不同双臂间距l和周期长度p下的传输特性；虚线：模拟不同双H间距距离s和周期长度p下的传输特性
Figure 3. (a) Simulated transmission characteristics for changing length b (b) Soild line: Simulated transmission characteristics under different arms spacing l and lengths p; Dotted line: Simulated transmission characteristics under different double H spacing distance s and lengths p
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