For a common metasurface with gradual phase, once the metasurface element structure is designed, we can only obtain a limited number of abnormal deflection angles based on the different arrangement characteristics of the metasurface element structure. In order to obtain continuously varying anomalous deflection angles, we propose addition and subtraction operations for coded metasurface sequences. In order to simplify the design process, we use geometric phase coding units to construct coded metasurface sequences. We can perform the addition and subtraction operations for two initial encoding metasurface sequences, and a new encoding sequence can be obtained. And a new corresponding scattering angle can be achieved. One do not need to redesign the size of the coding unit, and a continuous variation of deflection angles can be realized.

对于具有渐变相位的普通超表面，一旦设计了超表面元结构，我们只能根据超表面元结构的不同排列特征获得有限数量的异常偏转角。为了获得连续变化的异常偏转角，我们建议对编码的超表面序列进行加法和减法运算。为了简化设计过程，我们使用几何相位编码单元来构建编码的超表面序列。我们可以对两个初始编码超表面序列进行加减运算，得到一个新的编码序列。并且可以实现新的对应散射角。无需重新设计编码单元的尺寸，即可实现偏转角的连续变化。