Generation of multiple modes microwave vortex beams using tunable metasurface

Luyi Wang, Hongyu Shi, Shitao Zhu, Jianxing Li, A. Zhang, Lumei Li
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引用次数: 4

Abstract

In this paper, an active metasurface for vortex beam generation is proposed. This metasurface can transform the incident plane wave into vortex beams carrying orbital angular momentum (OAM) in four different modes. This active metasurface is composed of an array of varactor diodes loaded unit cells. The transmission phase of each metasurface unit cell can be fully controlled by the capacitance of the varactor diodes. Thus, it can generate four modes of vortex beams separately by simply changing the transmission phase distribution on the metasurface aperture. The properties of the proposed active metasurface is demonstrated by simulation results and have a good agreement with the theoretical design.
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利用可调谐超表面产生多模微波涡旋光束
本文提出了一种用于涡旋光束产生的有源超表面。该超表面可以将入射平面波以四种不同的模式转化为携带轨道角动量的涡旋光束。这种有源超表面是由一组负载单元的变容二极管组成的。每个超表面单元电池的传输相位可以完全由变容二极管的电容控制。因此,只需改变超表面孔径上的传输相位分布,就可以分别产生四种模式的涡旋光束。仿真结果表明,所提出的活性超表面的性能与理论设计基本一致。
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