基于透射型超表面的模态可重构太赫兹涡旋波束生成

周晶仪 郑史烈 余显斌 回晓楠 章献民

周晶仪, 郑史烈, 余显斌, 等. 基于透射型超表面的模态可重构太赫兹涡旋波束生成[J]. 雷达学报, 2022, 11(4): 728–735. doi: 10.12000/JR22021
引用本文: 周晶仪, 郑史烈, 余显斌, 等. 基于透射型超表面的模态可重构太赫兹涡旋波束生成[J]. 雷达学报, 2022, 11(4): 728–735. doi: 10.12000/JR22021
ZHOU Jingyi, ZHENG Shilie, YU Xianbin, et al. Reconfigurable mode vortex beam generation based on transmissive metasurfaces in the terahertz band[J]. Journal of Radars, 2022, 11(4): 728–735. doi: 10.12000/JR22021
Citation: ZHOU Jingyi, ZHENG Shilie, YU Xianbin, et al. Reconfigurable mode vortex beam generation based on transmissive metasurfaces in the terahertz band[J]. Journal of Radars, 2022, 11(4): 728–735. doi: 10.12000/JR22021

基于透射型超表面的模态可重构太赫兹涡旋波束生成

doi: 10.12000/JR22021
基金项目: 之江实验室重大项目(2020LC0AD01)
详细信息
    作者简介:

    周晶仪(1996-),女,浙江杭州人,浙江大学信息与电子工程学院硕士研究生。主要研究方向为太赫兹涡旋波束的产生及应用

    郑史烈(1975-),女,浙江宁波人,浙江大学信息与电子工程学院教授。主要研究方向为电磁波轨道角动量新理论与新技术、携带轨道角动量电磁波的产生与应用、新型可重构天线理论与设计等

    余显斌(1976-),男,湖北咸宁人,浙江大学信息与电子工程学院教授。主要研究方向为光电毫米波&太赫兹波器件、技术与应用以及超快光子射频信号处理等

    回晓楠(1988-),男,辽宁大连人,浙江大学信息与电子工程学院研究员。主要研究方向为无线传感理论与技术、射频系统、物联网技术与应用、电磁波轨道角动量新理论与新技术

    章献民(1965-),男,浙江兰溪人,浙江大学信息与电子工程学院教授。主要研究方向为微波光子学、电磁波理论和应用、电磁波轨道角动量新理论与新技术

    通讯作者:

    郑史烈 zhengsl@zju.edu.cn

  • 责任主编:李龙 Corresponding Editor: LI Long
  • 中图分类号: TN82

Reconfigurable Mode Vortex Beam Generation Based on Transmissive Metasurfaces in the Terahertz Band

Funds: This work is partly sponsored by Zhejiang Lab (2020LC0AD01)
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  • 摘要: 太赫兹技术与轨道角动量(OAM)技术相结合在高速无线通信领域具有巨大潜力。理论上不同模态的OAM之间具备严格正交性,若能将OAM技术应用到太赫兹通信系统中,必能极大提升系统的通信容量。因此,如何产生高质量的THz-OAM波束,并给予它灵活的动态控制成为研究者们的一大研究热点。该文设计了一种双层透射型超表面,使用3D打印作为加工方式,成本低、加工难度小。超表面单元结构采用高度可变的介质单元,随着单元高度不断发生改变,透射相位覆盖0°~360°,且透射率保持在88%以上。采用WR-10标准波导喇叭天线进行馈电,在100 GHz工作频率下,通过改变双层超表面之间的相对旋转角度,产生了不同模态的OAM波束。仿真结果表明,该文设计的超表面天线能够实现$ l=1,2,3 $的OAM波束,二维幅相结果符合对应模态的特征,$ l=1,2,3 $时,OAM波束的模态纯度分别为85.4%, 84.9%, 83.4%。 通过太赫兹扫场测试平台测试了天线在90 GHz, 100 GHz, 110 GHz频点下的电场分布。结果表明:在20 GHz带宽内,产生的OAM波束质量较好,证明该文设计的超表面天线在高频工作具有一定的工作带宽,有望应用于高频OAM通信。

     

  • 图  1  超表面单元结构

    Figure  1.  The unit structure

    图  2  超表面单元结构透射率、透射相位仿真结果

    Figure  2.  Simulation results of transmissivity and transmission phase of the unit structure

    图  3  双层超表面及馈源位置关系图

    Figure  3.  The setup of the feed and the double-layer metasurface

    图  4  球面波补偿板-喇叭天线集成示意图

    Figure  4.  Integration of the compensation board and the horn antenna

    图  5  双层超表面相位分布

    Figure  5.  Phase distributions of double-layer metasurface

    图  6  CST仿真模型

    Figure  6.  CST simulation the simulation model in CST

    图  7  双层超表面天线不同OAM模态时仿真的幅度相位分布图

    Figure  7.  The simulated amplitude and phase distribution of the double-layer metasurface antenna at different OAM mode

    图  8  根据仿真场分布得到的不同模态OAM的纯度分析

    Figure  8.  The OAM purity analysis based on the simulated field distribution

    图  9  双层超表面天线实物图

    Figure  9.  Photograph of the double-layer metasurface

    图  10  双层超表面天线实验装置

    Figure  10.  Experimental setup for the field scanning of the double-layer metasurface antenna

    图  11  双层超表面不同重构模态时测量的幅度相位分布图

    Figure  11.  The measured amplitude and phase distribution of the double-layer metasurface antenna at different OAM mode

    12  90, 100, 110 GHz下根据测量场分布得到的不同模态OAM的纯度分析

    12.  The OAM purity analysis based on the measured field distribution at 90, 100 and 110 GHz

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出版历程
  • 收稿日期:  2022-01-26
  • 修回日期:  2022-04-14
  • 网络出版日期:  2022-05-09
  • 刊出日期:  2022-08-28

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