太赫兹可调谐滤波器设计

Terahertz tunable filter design

为了实现太赫兹信号的可调谐滤波,设计了一种基于柔性材料的太赫兹可调谐滤波器。通过扭曲特氟龙(Teflon)波导形成环型谐振器,实现了160~200 GHz频段的带阻滤波功能。改变谐振腔长可实现自由频谱范围(FSR)和滤波频点的调谐,实验测试了自由频谱范围在1.9 GHz和2.8 GHz间切换以及相应的滤波特性。研究表明,谐振腔长一定时,改变弯曲半径可实现滤波阻带抑制度的调节,柔性材料太赫兹环型谐振器可用于可调谐滤波,且具有较高的自由度。

In order to realize terahertz tunable filtering wave,a terahertz tunable filter based on flexible materials was designed.By twisting the Teflon waveguide to form a ring resonator,the band-stop filter function in the 160 GHz to 200 GHz frequency band is realized.Changing the length of the resonant cavity can achieve the tuning of the free spectral range(FSR)and the filtering frequency.In the experiment,the switching of the free spectral range between 1.9 GHz and 2.8 GHz and the corresponding filtering characteristics are tested.Research results show that when the length of the resonant cavity is fixed,the stopband can be adjusted by changing the bending radius.The terahertz ring resonator using flexible materials can be used for tunable filtering and has a higher degree of freedom.