| Dandan Liu,Liangqi Gui,Ke Chen,Liang Lang,Zixiao Zhang,Han Chen,Lixing Liu,Tao Jiang.[J].重庆邮电大学新办英文刊,2021,7(1):16-28 |
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| Theoretical analysis and comparison of OAM waves generated by three kinds of antenna array |
| Received: November 17, 2019 Revised: September 25, 2020 |
| DOI：https://doi.org/10.1016/j.dcan.2020.09.009 |
| 中文关键词: |
| 英文关键词: Orbital angular momentum;Circularly polarized wave;Antenna array;Theoretical formula |
| 基金项目:This study was supported by the National Natural Science Foundation of China (NSFC 61771213), Shanghai Aerospace Science and Technology Innovation Fund (SAST2017-113), the Fundamental Research Funds for the Central Universities (HUST2016JCTD203, 2018KFYYXJJ140). |
| Author | Institution | E-mail | | Dandan Liu | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | | | Liangqi Gui | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | | | Ke Chen | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | | | Liang Lang | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | | | Zixiao Zhang | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | | | Han Chen | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | | | Lixing Liu | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | | | Tao Jiang | Wuhan National Laboratory for Optoelectronics, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, 430074, China | taojiang@hust.edu.cn |
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| 中文摘要: |
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| 英文摘要: |
| Antenna array is one of the methods which can generate Orbital Angular Momentum (OAM) waves. However, OAM waves generated by different antenna arrays have different characteristics of Electric-field (E-field) components’ distribution and radiation patterns. In order to solve this problem, we derive E-field formulas of OAM waves generated by different kinds of dipole antenna array in this paper. The dipole antenna arrays are arranged by three methods: 1) antenna elements are in the same direction of y axis, 2) antenna elements are in the radial direction and 3) antenna elements are in the azimuthal direction. Results show that x components, y components and z components carry different OAM modes under the three conditions. Simulation results show that the same direction antenna array produces the best OAM waves because the y component is dominated by OAM mode l and RHCP/LHCP waves are negligible in energy, while the pure OAM waves carried by the z components generated by the other two antenna arrays have little energy. In addition, only the radiation pattern of l = 0 produced by the same direction antenna array does not have a null zone in the propagation direction. Radiation patterns of l = ±1 do not have null zones in the propagation direction generated by other two antenna arrays. |
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