A novel dual-layer frequency selective surface (FSS) with extended cross-dipole structure is reported in this paper. The elementary form of the FSS is designed at high frequency which is then made to operate at low frequency by increasing the arm length without increasing the footprint of the FSS. The extended arm runs on both the sides of the printed circuit board (PCB) where the connection is accomplished using plated through-hole (PTH) vias. The miniaturized FSS unit cell provides band-stop response at 1.6 GHz within a small footprint of 0.026λ_o × 0.026λ_o (5 mm × 5 mm) where λ_o is the free-space wavelength. The proposed unit cell has rotational symmetry and hence provides good polarization stability. The angular stability is investigated and stable shielding effectiveness performance is witnessed. The proposed FSS offers angular stability up to 60 degrees. The prototype FSS screen is fabricated and the measurement results are presented. The measured shielding effectiveness is greater than 26 dB for both TE and TM mode of operation. The proposed FSS is suitable for antenna gain enhancement and radome applications in L-band.

本文报道了一种新型的具有扩展交叉偶极结构的双层频率选择性表面（FSS）。FSS的基本形式是在高频下设计的，然后通过增加臂长而不增加FSS的占地面积，使其在低频下工作。延伸臂在印刷电路板（PCB）的两侧延伸，在此处使用镀通孔（PTH）通孔实现连接。小型化的FSS单元电池提供的0.026λ的小体积内的1.6 GHz的带阻响应_ö  ×0.026λ _ø（5×5mm正方形）其中λ _Ô是自由空间波长。所提出的晶胞具有旋转对称性，因此提供了良好的偏振稳定性。研究了角稳定性，并观察到了稳定的屏蔽效能。提议的FSS可提供高达60度的角度稳定性。制作了原型FSS屏幕并提供了测量结果。对于TE和TM操作模式，测得的屏蔽效果均大于26 dB。提出的FSS适用于L波段的天线增益增强和天线罩应用。