Programmable High-Order OAM-Carrying Beams for Direct-Modulation Wireless Communications
Programmable High-Order OAM-Carrying Beams for Direct-Modulation Wireless Communications
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DOI：
10.1109/jetcas.2020.2973391
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发表时间：
2020-03-01
影响因子：
4.6
通讯作者：
Li, Lianlin
中科院分区：
文献类型：
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作者：
Shuang, Ya;Zhao, Hanting;Li, Lianlin
携带轨道角动量（OAM）的电磁（EM）波束由于具有自重构和多波束复用的特性，在现代无线通信中具有重要意义。然而，它们几乎没有部署在现实世界的情况下，因为它们不能以实时和低成本的方式动态生成，特别是对于拓扑电荷超过2的情况。为了解决这个问题，我们探索了一种廉价的2位可编程编码元表面，工作在3.2 GHz左右，沿着，并采用一种高效的优化算法，以可重编程的方式生成高阶OAM承载波束。基于所设计的超颖表面，我们可以产生具有电控涡旋中心和拓扑电荷l=0$，+/- 1，+/- 2，+/- 3，+/- 4，+/- 5，+/- 6的OAM EM光束，并已得到实验验证。作为一个说明性的例子，我们展示了一个有趣的应用程序的设计2位可编程元表面直接调制线的视线无线通信。我们相信，制定的战略将带来一个全新的角度在各种频率的无线通信架构的设计。
Electromagnetic (EM) beams carrying orbital angular momentum (OAM) are of great importance in modern wireless communications due to their attractive properties of self-reconstruction and multiplexing multiple beams. However, they are hardly deployed in a real-world scenario since they cannot be dynamically generated in a real-time and low-cost way, especially for the case of topological charges more than 2. To resolve this issue, we explore an inexpensive 2-bit programmable coding metasurface working at around 3.2 GHz along with an efficient optimization algorithm for the generation of high-order OAM-carrying beams in a reprogrammable way. Based on the designed metasurface, we can generate OAM EM beams with the electronically controlled vortex centers and topological charges of l=0$ , +/- 1, +/- 2, +/- 3, +/- 4, +/- 5, and +/- 6, which have been experimentally verified. As an illustrative example, we demonstrate an interesting application of the designed 2-bit programmable metasurface in direct-modulation line-of-sight wireless communications. We believe that the developed strategy will bring a fundamentally new perspective on the design of wireless communication architectures at various frequencies.