设计一种具有梯度相位的高透射率宽带毫米波超表面结构,该超表面结构在55~75 GHz频段内工作。该结构由2个介电层和3个金属层组成,其中间金属层为缺口矩形环,缺口矩形环的几何形状可以对相位进行0~2π范围内的调整,实现偏振转换。具有不同缺口矩形环的结构单元的透射相位差在工作频段内基本保持不变,从而保证了其宽带特性。栅格层的作用是使超表面结构具有高透射性能。所设计的透射超表面结构已成功应用于平面透镜及轨道角动量波束的超表面设计中。

A high-transmittance broadband millimeter wave metasurface structure with gradient phase is presented, and the metasurface structure works in the 55-75 GHz frequency band. This proposed structure comprises two dielectric layers and three metal layers. The intermediate metal layer is notched rectangular ring which can adjust the phase in the range of 0-2π by adjusting the geometry. The function of the notched rectangular ring is to achieve polarization conversion. The transmission phase difference of construction units with different notched rectangular rings basically remains unchanged in working frequency band, thereby ensuring the broadband property. The grid layer ensures the high transmission performance of the metasurface structure. The proposed metasurface structure is successfully applied to the metasurface designs of a planar lens and orbital angular momentum beam.