Miniaturized and Dual-stopband FSS with Large Band Ratio

In this letter, a miniaturized and dual-stopband frequency selective surface(FSS) with a large band ratio(BR) is presented. This structure is composed of one metal layer and two dielectric layers and has excellent miniaturization characteristics. In particular, the unit size is only 0.054λ0 and the thickness is only 0.014λ0, where λ0 is the wavelength corresponding to the first resonant frequency. And there is only one layer of metal layer, which greatly reduces the processing complexity and cost. The measurement results show that for TE and TM polarization, the center frequencies of the two stop bands are 2.03 GHz and 18.98 GHz corresponding to a BR of 9.35. It can be used as a spatial dual frequency filter with large frequency band separation. In addition, the proposed structure also possesses advantages such as wideband response, good polarization stability, and high angle stability. The simulation results are in good agreement with the measured results.