A novel dual-band miniaturized frequency selective surface with high selectivity

In this paper, a novel dual-band multilayer frequency selective surface (FSS) with high selectivity and miniaturization characteristics is proposed. The FSS consists of a top and bottom resonant layer and an intermediate coupling layer. The top and bottom resonant layers provide dual-band passbands, and the cross-coupling between the three layers makes the structure produce four transmission zeros (TZs) distributed two-by-two on both sides of the passband to improve the sharp roll-off characteristics of the structure. Use bent structures in the top and bottom layers of the cell design to achieve miniaturization of the elements. FSS provides stable performance in incident angles from 0 degrees to 45 degrees with different polarizations of incident waves (TE and TM wave). The lower band of FSS works at 9.1 GHz and the higher band works at 10.26 GHz, the cell size of FSS is 0.157 lambda 0x0.157 lambda 0x0.015 lambda 0 $0.157{\lambda }_{0}\times 0.157{\lambda }_{0}\times 0.015{\lambda }_{0}$, FSS samples were made and tested, and the test results fit well with the simulation results.