{"title":"基于天线阵列的OAM模式纯度改进","authors":"","doi":"10.1016/j.dcan.2023.01.015","DOIUrl":null,"url":null,"abstract":"<div><p>Orbital Angular Momentum (OAM) waves are characterized by helical wave fronts and orthogonality between different modes. Therefore, OAM waves have huge potential in improving wireless communications' channel capacity and radar imaging's resolution. Consequently, the generation and application of OAM waves have attracted a lot of attention. And many methods are proposed to generate OAM waves. Although antenna array is the most popular method of generating OAM waves, OAM waves generated by antenna array have redundant modes. However, all advantages of OAM waves are closely related to infinite OAM modes. Thus, to better apply OAM waves to wireless communications and radar, it is very important to reduce unnecessary OAM modes and improve the OAM mode purity. In order to improve the OAM mode purity, two combined antenna arrays composed of X direction antenna and Y direction antenna array are proposed in this paper. The X direction antenna array and the Y direction antenna array are supplied by the excitations with the same amplitude and fixed phase shift. The overall phase shift of the X direction antenna array is <em>π</em>/2 more or less than that of the Y direction antenna array. The results of formulas and antenna models in CST show that the combined antenna arrays can generate OAM waves with less redundant modes in <strong><em>x</em></strong> component, <strong><em>y</em></strong> component and <strong><em>z</em></strong> component. Besides, the <strong><em>z</em></strong> component carries pure OAM modes.</p></div>","PeriodicalId":48631,"journal":{"name":"Digital Communications and Networks","volume":null,"pages":null},"PeriodicalIF":7.5000,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352864823000287/pdfft?md5=98ae7f3b30d45a60b9b9d429ff0da54f&pid=1-s2.0-S2352864823000287-main.pdf","citationCount":"0","resultStr":"{\"title\":\"OAM mode purity improvement based on antenna array\",\"authors\":\"\",\"doi\":\"10.1016/j.dcan.2023.01.015\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Orbital Angular Momentum (OAM) waves are characterized by helical wave fronts and orthogonality between different modes. Therefore, OAM waves have huge potential in improving wireless communications' channel capacity and radar imaging's resolution. Consequently, the generation and application of OAM waves have attracted a lot of attention. And many methods are proposed to generate OAM waves. Although antenna array is the most popular method of generating OAM waves, OAM waves generated by antenna array have redundant modes. However, all advantages of OAM waves are closely related to infinite OAM modes. Thus, to better apply OAM waves to wireless communications and radar, it is very important to reduce unnecessary OAM modes and improve the OAM mode purity. In order to improve the OAM mode purity, two combined antenna arrays composed of X direction antenna and Y direction antenna array are proposed in this paper. The X direction antenna array and the Y direction antenna array are supplied by the excitations with the same amplitude and fixed phase shift. The overall phase shift of the X direction antenna array is <em>π</em>/2 more or less than that of the Y direction antenna array. The results of formulas and antenna models in CST show that the combined antenna arrays can generate OAM waves with less redundant modes in <strong><em>x</em></strong> component, <strong><em>y</em></strong> component and <strong><em>z</em></strong> component. 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引用次数: 0
摘要
轨道角动量（OAM）波具有螺旋波前和不同模式之间正交的特点。因此，OAM 波在提高无线通信信道容量和雷达成像分辨率方面具有巨大潜力。因此，OAM 波的产生和应用引起了广泛关注。人们提出了许多产生 OAM 波的方法。虽然天线阵列是最常用的 OAM 波产生方法，但天线阵列产生的 OAM 波具有冗余模式。然而，OAM 波的所有优点都与无限 OAM 模式密切相关。因此，为了更好地将 OAM 波应用于无线通信和雷达，减少不必要的 OAM 模式并提高 OAM 模式的纯度非常重要。为了提高 OAM 模式的纯度，本文提出了由 X 向天线阵列和 Y 向天线阵列组成的两个组合天线阵列。X 向天线阵列和 Y 向天线阵列由具有相同振幅和固定相移的激励提供。X 向天线阵列的整体相移比 Y 向天线阵列多或少π/2。CST 中的公式和天线模型结果表明，组合天线阵列可以在 x 分量、y 分量和 z 分量中产生冗余模式较少的 OAM 波。此外，z 分量携带纯 OAM 模式。
OAM mode purity improvement based on antenna array
Orbital Angular Momentum (OAM) waves are characterized by helical wave fronts and orthogonality between different modes. Therefore, OAM waves have huge potential in improving wireless communications' channel capacity and radar imaging's resolution. Consequently, the generation and application of OAM waves have attracted a lot of attention. And many methods are proposed to generate OAM waves. Although antenna array is the most popular method of generating OAM waves, OAM waves generated by antenna array have redundant modes. However, all advantages of OAM waves are closely related to infinite OAM modes. Thus, to better apply OAM waves to wireless communications and radar, it is very important to reduce unnecessary OAM modes and improve the OAM mode purity. In order to improve the OAM mode purity, two combined antenna arrays composed of X direction antenna and Y direction antenna array are proposed in this paper. The X direction antenna array and the Y direction antenna array are supplied by the excitations with the same amplitude and fixed phase shift. The overall phase shift of the X direction antenna array is π/2 more or less than that of the Y direction antenna array. The results of formulas and antenna models in CST show that the combined antenna arrays can generate OAM waves with less redundant modes in x component, y component and z component. Besides, the z component carries pure OAM modes.
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