In this paper, a single-layer ultrawideband polarization conversion metasurface with high-efficiency is proposed. The top metallic structure is formed by folding the L-shaped structure in meanders, which can produce additional resonances and reduce the resonant frequency. Therefore, ultrawideband polarization conversion is realized (ranging from 7.79 to 30.22GHz, covering C-, X-, Ku-, K-, and Ka-bands) with high polarization conversion ratio (>0.9), and the relative bandwidth is up to 118.02%. Numerical simulations are well supported by experimental measurements. The designed ultrawideband metasurface may have potentials in imaging systems and microwave communications.

在本文中，提出了一种高效的单层超宽带偏振转换超表面。顶部金属结构是通过将L形结构折叠成曲折而形成的，这可以产生额外的共振并降低共振频率。因此，实现了高偏振转换比（>0.9）的超宽带偏振转换（7.79~30.22GHz，覆盖C、X、Ku、K、Ka波段），相对带宽可达118.02%。实验测量很好地支持了数值模拟。设计的超宽带超表面可能在成像系统和微波通信中具有潜力。