Generation and propagation characteristics of electromagnetic vortices in radio frequency
Generation and propagation characteristics of electromagnetic vortices in radio frequency
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DOI：
10.1364/prj.4.0000b9
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发表时间：
2016-10
影响因子：
7.6
通讯作者：
Shilie Zheng;Weite Zhang;Zhuofan Zhang;Xiaofeng Jin;H. Chi;Xianmin Zhang
中科院分区：
文献类型：
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作者：
Shilie Zheng;Weite Zhang;Zhuofan Zhang;Xiaofeng Jin;H. Chi;Xianmin Zhang
电磁涡旋描述了具有螺旋相锋的轨道角动量（OAM）携带波，由于其在许多不同领域的潜在应用，最近引起了射频领域的广泛关注。在基于OAM的场景中，用于OAM模式复用/解复用的天线在控制整个系统性能方面起着至关重要的作用。在本文中，我们从理论上和实验上证明了一种易于实现的基于行波圆环结构的 OAM 天线，可有效地复用/解复用多种 OAM 模式；此外，还对其一般传播特性（包括偏振、发散和辐射方向图）进行了数学分析。还讨论了天线尺寸减小和各种辐射方向图操纵的方案，以实现更加灵活和紧凑的系统。
Electromagnetic vortices, which describe the orbital angular momentum (OAM) carrying waves with a helical phase front, have recently attracted much interest in a radio frequency domain due to their potential applications in many diverse areas. In an OAM-based scenario, the antenna for OAM mode multiplexing/demultiplexing plays an essential role in controlling the overall system performance. In this paper, we demonstrated theoretically and experimentally an easily realized OAM antenna based on the traveling-wave circular loop structure for efficiently multiplexing/demultiplexing multiple OAM modes; in addition, its general propagation characteristics including the polarization, divergence, and radiation pattern are mathematically analyzed. Schemes for antenna size reduction and various radiation pattern manipulations have also been discussed to realize a more flexible and compact system.