Volume 31 Issue 6
Nov.  2022
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LIN Jie, YANG Guang, LI Weiwen, et al., “Mode Purity Improvement of High-Order Vortex Waves,” Chinese Journal of Electronics, vol. 31, no. 6, pp. 1146-1154, 2022, doi: 10.1049/cje.2022.00.115
Citation: LIN Jie, YANG Guang, LI Weiwen, et al., “Mode Purity Improvement of High-Order Vortex Waves,” Chinese Journal of Electronics, vol. 31, no. 6, pp. 1146-1154, 2022, doi: 10.1049/cje.2022.00.115

Mode Purity Improvement of High-Order Vortex Waves

doi: 10.1049/cje.2022.00.115
Funds:  This work was supported by the National Natural Science Foundation of China (62071403)
More Information
  • Author Bio:

    Jie LIN was born in 1999. She received the B.E. degree from School of Information Engineering, Jimei University, in 2021. She is currently pursuing the M.E. degree in electronic information at Xiamen University. Her research interests include photonic topology and metamaterials. (Email: linjie37@stu.xmu.edu.cn)

    Guang YANG was born in 1997. He received the B.S. degree from School of Information, Xiamen University, in 2015. He is currently pursuing the M.S. degree in the Department of Electronic Engineering, Xiamen University since 2019. His research interests include microwave and antenna technology and microstrip antenna design. (Email: ygshine@foxmail.com)

    Weiwen LI (corresponding author) was born in 1968. He received the B.S. degree from Department of Electronic Science, Jilin University, in 1993. He is now an Associate Professor in the Department of Electronic Engineering, Xiamen University since 2005. He research interests include electromagnetic theory and metamaterials, microwave devices, and antenna technology. (Email: wwl@xmu.edu.cn)

    Cheng AN was born in 1998. He received the B.S. degree from School of Electronic Information and Communications, Huazhong University of Science and Technology, in 2020. He is now a graduate student at the School of Electronic Science and Technology, Xiamen University since 2020. His research interests include the theory of characteristic modes and orbital angular momentum. (Email: 953346471@qq.com)

  • Received Date: 2022-05-03
  • Accepted Date: 2022-08-02
  • Available Online: 2022-09-20
  • Publish Date: 2022-11-05
  • Vortex electromagnetic waves can carry orbital angular momentum (OAM) modes of different order number, which are mutually orthogonal. Communication technologies multiplexing different OAM topological charges have attracted extensive attention in improving spectrum utilization. In this regard, the efficient generation of OAM modes becomes a key issue. However, it is difficult to generate high-order OAM modes by using a microstrip antenna with a simple structure, and the mode purity is usually not high. Methodologically, the OAM wave of a microstrip antenna is mostly achieved by synthesizing degenerate eigenmodes. In this paper, combined with eigenmode analysis, the construction of high-order and high-purity OAM mode microstrip antennas is carried out from the perspectives of radiating element, ground plane, and structural symmetry. For a regular hexagonal patch antenna of the 4th-order OAM mode, the mode purity is improved from about 40% to over 80% by removing the inner conductor of the patch layer, using a circular ground plane, and adding lug patches on the outside. This method of improving mode purity through the analysis of mode significance and characteristic current distribution also has guiding significance for the design of other high-order OAM mode patch antennas.
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