多频带太赫兹滤波器的设计

基于不同大小形状的谐振环对电磁场不同响应的原理，设计了一种由6个嵌套式的方形封闭谐振环结构（CRR）组成的多频带太赫兹滤波器。通过利用时域有限差分法(FDTD)对该滤波器的透射特性进行研究，结果表明:当电磁波正入射或斜入射到谐振环所在平面时，能够出现六频带的滤波性，并且其透射系数对入射角度的变化并不敏感。该设计增加了滤波频带的个数，提高了滤波器对频率的敏感度，为多频带传感器、太赫兹通信技术等领域提供了理论方法。

Design of multiband terahertz filter

Based on the different resonant responses to the electromagnetic fields produced by different sizes of square closed-ring resonator (CRR)，a terahertz(THz) multiband filter comprised of 6 CRRs was proposed. By utilizing the finite-difference time-domain method (FDTD),the transmission characteristic of the filter was studied.It is found that the filter can produce six-band filtering performance when the electromagnetic(EM) wave is incident to the plane of the resonant ring normally or obliquely, and the filtering performance of the THz filter is independent to the variation of the incident angle of EM wave due to the symmetry of square closed-ring resonator. This design increases the number of the filtering band so as to improve the frequency sensitivity. The proposed method can provide a theoretical tool to perform multiple angles sensors, THz communication technologies and so on.