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.