Aiming at the problems of low-frequency coverage, angle and polarization instability of ultra-wideband (UWB) frequency selective surface (FSS) in practical application, this paper introduces the additional circular parasitic patches and two-stage rectangular bent grids to enhance coupling, miniaturize geometry size, broaden bandwidth and suppress the drift of resonance frequencies based on the construction of a FSS unit cell by using a basic circular patch and a Jerusalem cross grid. The simulated and measured results show that the bandwidth of the FSS is 13.47 GHz, and its fractional bandwidth is 140.53%, which fully covers the UWB band (3.1–10.6 GHz). The UWB FSS has the flat transmission passband, and high transmission characteristics, and maintains stable performance at large incident angles and different polarization modes. The size of the UWB FSS unit cell is 0.25 λc × 0.25 λc × 0.12 λc. Therefore, the UWB FSS can be applied to electromagnetic stealth and the related fields of UWB communications.

针对实际应用中超宽带(UWB)选频面(FSS)的低频覆盖范围、角度和极化不稳定性问题，本文引入附加圆形寄生贴片和两级矩形弯曲网格来增强耦合，通过使用基本圆形贴片和耶路撒冷十字网格构建 FSS 晶胞，缩小几何尺寸，加宽带宽并抑制共振频率的漂移。仿真和实测结果表明，FSS的带宽为13.47 GHz，其部分带宽为140.53%，完全覆盖了UWB频段（3.1-10.6 GHz）。UWB FSS传输通带平坦，传输特性高，在大入射角和不同偏振模式下保持稳定的性能。UWB FSS 单元的大小为 0.25 λc × 0.25 λc × 0.12 λc。因此，超宽带FSS可应用于电磁隐身及超宽带通信相关领域。