Guo Meijia, Xin Penghui, Sun Haoyuan, Li Hengfeng, Chernogor Leonid F, Jin Zhejun, Liu Tian, Zheng Yu
College of Electronic Information, Qingdao University, Qingdao, 266071, China.
Sci Rep. 2025 May 2;15(1):15467. doi: 10.1038/s41598-025-99768-1.
In this study, a coded metasurface design employing the Pancharatnam-Berry (PB) phase principle was proposed, with precise beam steering achieved via phase gradient variations. The designed metasurfaces have the characteristics of flexibility and transparency. The metasurface unit uses a modified C structure to form dual-resonant points to form a wide frequency band, and the PB phase satisfy the relationship between the rotation angle of the element and the double difference of the reflected phase, by encoding metasurface arrays, functions such as reducing linearly polarized radar cross sections (RCS) and steering circularly polarized beams can be achieved. The array effectively reduces the linear polarization RCS in the 13-20 GHz band by rotating the phase difference between the unit metasurfaces. Under circularly polarized plane wave excitation, the metasurface unit achieves a high polarization conversion ratio (PCR) of approximately 0.9 within the 14-25 GHz frequency band. Experimental results show that the metasurface array achieves ± 50° wide-angle beam steering along both X- and Y-axes while maintaining 82% visible-light transmittance, providing potential applications in flexible electronics and reconfigurable intelligent surfaces (RIS).
在本研究中，提出了一种采用潘查拉特纳姆-贝里（PB）相位原理的编码超表面设计，通过相位梯度变化实现精确的波束转向。所设计的超表面具有灵活性和透明性的特点。超表面单元采用改进的C结构形成双谐振点以形成宽频带，并且PB相位满足单元旋转角度与反射相位双差之间的关系，通过对超表面阵列进行编码，可以实现诸如降低线性极化雷达散射截面（RCS）和控制圆极化波束等功能。该阵列通过旋转单元超表面之间的相位差，在13 - 20 GHz频段有效降低了线性极化RCS。在圆极化平面波激励下，超表面单元在14 - 25 GHz频段内实现了约0.9的高极化转换率（PCR）。实验结果表明，该超表面阵列在保持82%可见光透过率的同时，沿X轴和Y轴均实现了±50°的广角波束转向，为柔性电子和可重构智能表面（RIS）提供了潜在应用。
