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

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

浙江大学信息与电子工程学院杭州 310027

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
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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

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

College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China

Funds: This work is partly sponsored by Zhejiang Lab (2020LC0AD01)

More Information

Corresponding author: ZHENG Shilie, zhengsl@zju.edu.cn

摘要

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 $时，OAM波束的模态纯度分别为85.4%, 84.9%, 83.4%。通过太赫兹扫场测试平台测试了天线在90 GHz, 100 GHz, 110 GHz频点下的电场分布。结果表明：在20 GHz带宽内，产生的OAM波束质量较好，证明该文设计的超表面天线在高频工作具有一定的工作带宽，有望应用于高频OAM通信。
- 太赫兹 /
- 涡旋波束 /
- 模态可重构 /
- 超表面 /
- 透射型
Abstract: Combining Terahertz (THz) and Orbital Angular Momentum (OAM) technologies has great potential in high-speed wireless communication. Theoretically, OAM with different modes has strict orthogonality. The communication capacity of the system will improve significantly if OAM technology is applied to the THz communication system. Thus, the manner to generate a high-quality and dynamically controllable THz-OAM beam has been of significant interest to researchers in related fields. In this study, a double-layer transmissive metasurface that uses 3D printing as the processing method with a low cost and processing difficulty is designed. Note that the height of the unit cell for constructing the metasurface is configurable. As the height changes continuously, the phase of the transmitted wave covers 0～2${\pi }$ within 90~110 GHz, while the transmittance of the units is always higher than 88%. At 100 GHz, which is fed by a WR-10 standard waveguide horn antenna, OAM beams with different modes are generated by changing the relative rotation angle between the double-layer metasurface. The simulation results show that the metasurface antenna designed in this study can achieve OAM beams of $ l=1, \mathrm{2,3} $, and the two-dimensional amplitude and phase results correspond with the characteristics of the corresponding modes. When $ l=1,\mathrm{ }2,\mathrm{ }3 $, the OAM beam’s modal purity is 85.4%, 84.9%, and 83.4%, respectively. The measurement results include the results at frequency points of 90, 100, and 110 GHz. The results show that the OAM beam has a high-quality bandwidth of 20 GHz, which indicates that the metasurface antenna designed in this study has a wide working bandwidth at a high frequency and can be applied to high-frequency OAM communication.
- Terahertz /
- Vortex beam /
- Reconfigurable mode /
- Metasurface /
- Transmissive

HTML全文

图 1 超表面单元结构

Figure 1. The unit structure

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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

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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

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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

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图 5 双层超表面相位分布

Figure 5. Phase distributions of double-layer metasurface

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图 6 CST仿真模型

Figure 6. CST simulation the simulation model in CST

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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

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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

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图 9 双层超表面天线实物图

Figure 9. Photograph of the double-layer metasurface

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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

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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

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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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