太赫兹波导多通道滤波器的研究

Research on terahertz waveguide multichannel filter

摘要:

研究了一种基于多模共振的多通道太赫兹波导滤波器。在太赫兹周期结构波导中引入缺陷，可以在禁带范围内形成通带，从而实现窄带滤波。通过数值模拟对多通道滤波器的特性进行了研究。结果表明，通过改变缺陷长度可以实现通道数可调的多通道滤波功能，通道数可达10~12个，透过率均在98%以上。此外，改变波导结构的周期个数，还可实现对通带带宽的调控，最窄带宽可达0.01 GHz。该波导滤波器性能优良，具有结构紧凑、易于集成、透过率高、通道多、带宽窄等优点，为太赫兹波段功能器件的研制提供重要的技术参考。

Abstract:

A multi-channel terahertz waveguide filter based on multimode resonance is studied. By introducing defects in terahertz periodic structure waveguide, the passband can be formed in the forbidden band range, so as to realize narrow-band filtering. The characteristics of multi-channel filter are studied by numerical simulation. The results show that the multi-channel filtering function with adjustable number of channels can be realized by changing the defect length. The number of channels can reach 10-12, and the transmittance is more than 98%. In addition, by changing the number of cycles of the waveguide structure, the passband bandwidth can be adjusted, and the narrowest bandwidth can reach 0.01 GHz. The waveguide filter has excellent performance and has the advantages of compact structure, easy integration, high transmittance, multi-channel and narrow bandwidth. It provides an important technical reference for the development of functional devices in terahertz band.