An angle-independent broadband terahertz bandstop filter based on compact cross-shaped array
Received:May 20, 2019  Revised:November 15, 2019  download
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Author NameAffiliationPostcode
NING Yu-Peng School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China 100044
LOU Shu-Qin School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China 
JIA Hong-Zhi School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China 
LIU Xi-Dan School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China 
SUN Pu  
Abstract: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.
keywords:terahertz filter  frequency selective surface  compact array  angle independent  anti-symmetric mode
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Copyright:《Journal of Infrared And Millimeter Waves》