基于紧凑十字阵列的角度无关的宽带太赫兹带阻滤波器（英文）

An angle-independent broadband terahertz bandstop filter based on compact cross-shaped array

介绍了一种可以在一些特殊的频率选择表面上激发额外的反对称模式的紧凑阵列设计.基于这种设计,本文提出了一种角度无关的宽带太赫兹(THz)带阻滤波器.紧凑十字架阵列由两层十字架金属阵列组成,其中第二层金属十字架的中心与第一层四个金属十字架单元的中心对齐.数值结果显示紧凑阵列可以激发出一种额外的谐振模式.与传统的周期设计相比,基于紧凑阵列的滤波器在带宽、通带平坦度和阻带衰减均有很大的性能提升.提出的滤波器具有良好的滤波能力,其在1.2 THz的中心频率处具有0.75 THz的10 dB带宽且在0°~60°的范围内对角度不敏感.此外,紧凑阵列可以被拓展运用到多种不同的结构,如耶路撒冷十字架结构,Ⅰ型以及Ⅱ型等结构.

In this paper,a design of compact array which can excite anti-symmetric mode on special frequency selective surfaces is introduced.Based on compact cross-shaped array,we proposed an angle independent broadband terahertz(THz)bandstop filter with compact cross-shaped array.The compact cross-shaped array is composed of two layers of cross-shaped metal array,in which the center of every cross-shaped unit cell in second layer is arranged at the center of four cross-shaped unit cells in the first layer.Numerical results demonstrate that the compact array can efficiently increase the received area of the filter and excite an additional resonant mode.Compared with traditional repetitive structure,the proposed filter based on compact array has great promotion in bandwidth,sharpness and stopband depth.The filter has a notable filter capability with 10 dB bandwidth of 0.75 THz at the central frequency of 1.2 THz and incident angle insensitive range from 0°to 60°.Furthermore,the proposed compact array is flexible and can be extended for different unit cells,such as Jerusalem cross,I-shaped,Ⅱ-shaped structures,etc.