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中国物理学会期刊

编码超构表面实现双波束独立可重构

Independent dual-beam control based on programmable coding metasurface

CSTR: 32037.14.aps.70.20210344
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  • 近年来, 有源超构表面因其对电磁波的灵活、动态调控而备受关注. 本文设计并分析了一种有源可编程超构表面单元, 并探讨了其在双波束、多波束独立可重构方面的应用. 理论分析了如何实现对称双波束、非对称双波束电磁波辐射以及多波束独立可重构, 并对所设计的编码超构表面进行仿真分析和实验验证. 全波仿真结果表明, 超构表面具有较好的辐射性能, 主瓣辐射方向与理论计算结果一致. 作为实验验证, 我们加工了样品并在标准微波暗室中进行了测试. 实验测试与仿真分析结果吻合良好, 均表明该超构表面在微波频率能够对双波束进行独立的动态调控, 且波束方向性较好. 因而, 这种可编程超构表面有望进一步实现多通道信息传输, 并在无线通信系统中具有良好的应用前景.

     

    Programmable metasurfaces incorporating with tunable materials or components are emerging as an attractive option to realize reconfigurable manipulations of electromagnetic (EM) behaviors in real-time. Many efforts have been devoted to the realization of active EM manipulations of the metasurface and significant progress has been achieved, showing their unprecedented ability to arbitrarily manipulate wavefronts in dynamic functions. However, most of the existing multi-beam metasurfaces are based on passive building blocks, only possessing one or a few functions, which cannot provide tunable and independent multi-beam control, thus limiting their further uses in wireless communications. Hence, a 1-bit coding metasurface with high-efficiency, programmable, and independent multi-beam control is proposed in this paper, providing dynamic EM responses with real-time reconfigurability, and controlled by external digital circuits through direct current (DC) bias networks. Specifically, the meta-atom loaded with PIN diodes is employed to achieve independently tunable phase characteristics, thus complex EM functions can be manipulated by redistributing the spatial phases of the metasurface. Symmetric/asymmetric independent dual- and multi-beam manipulations are analyzed theoretically and simulated by EM software. Then as an experimental verification, a metasurface consisting of 14 × 14 meta-atoms is fabricated and tested in a standard microwave anechoic chamber, and the measured results accord well with the simulations. The proposed metasurface has promising ability to generate the arbitrary and independent multi-beams, which may largely enhance the information capacity of the metasurfaces, offering untapped potentials in wireless communication systems.

     

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