圆极化天线轴比特性与结构关系研究

发布时间：2018-04-10 13:22

本文选题：圆极化 + 宽波束　；参考：《东南大学》2017年硕士论文

【摘要】：在卫星通信、导航、雷达等通讯系统中,线极化天线难以满足愈发严格的要求,而圆极化天线具有低极化损耗、抗多径干扰等众多的优点,因此圆极化天线得到了越来越普遍的应用。其中卫星通信系统在近二十年来发展迅速,对圆极化天线的性能也提出了更加严格的要求。本文以国家自然科学基金项目"立体多面圆极化天线"为背景,仿真研究了新型的单馈和双馈的立体多面圆极化天线。本文的主要贡献点不仅包括了可以指导新型圆极化天线设计的理论分析和设计方法,还提供了一款具有实用价值的宽波束圆极化天线。本文的主要工作是:1)分析解明影响圆极化天线轴比波束宽度的因素。通过理论分析与仿真计算验证相结合的方法,分别分析了天线的主向轴比和宽角度轴比的变化机制;导出了圆极化的两个正交极化分量之间的幅度误差和相位误差对轴比影响的公式;仿真分析了天线轴比波束宽度与天线结构尺寸和基板材料的关系,得出了一系列可以指导圆极化天线设计的结论。2)提出了一种单馈点立体翻折圆极化天线结构,该天线通过贴片翻折来保证优良的半功率波束宽度和3 dB轴比波束宽度;分析了贴片翻折与天线波束宽度的关系;给出了单馈点立体翻折圆极化天线的设计步骤;仿真结果显示该天线的半功率波束宽度达到110°、3 dB轴比波束宽度达到200°以上;测试结果与仿真结果基本吻合,验证了仿真工作的可靠性。本文的研究工作为设计宽轴比波束的圆极化天线提供了新的技术途径,有助于新型立体多面圆极化天线的研制。
[Abstract]:In satellite communication, navigation, radar and other communication systems, linear polarization antenna is difficult to meet the increasingly stringent requirements, while circular polarization antenna has many advantages, such as low polarization loss, anti-multipath interference and so on.Therefore, circular polarization antenna has been more and more widely used.The satellite communication system has developed rapidly in the past twenty years, and the performance of circularly polarized antenna is required more strictly.In this paper, based on the project of National Natural Science Foundation of China, "Three-Dimensional Multiplanar Circular polarization Antenna", a new type of single-fed and double-fed stereoscopic multiplanar circularly polarized antenna is simulated and studied.The main contributions of this paper include not only the theoretical analysis and design methods which can guide the design of the new circular polarization antenna, but also a wide beam circular polarization antenna with practical value.The main work of this paper is to analyze the factors that affect the beam width of circular polarization antenna.The main axis ratio and the wide angle axial ratio of the antenna are analyzed by combining the theoretical analysis with the simulation calculation.The effects of amplitude error and phase error on axial ratio between two quadrature polarization components of circular polarization are derived, and the relationship between antenna axial ratio beam width and antenna structure size and substrate material is simulated and analyzed.A series of conclusions which can guide the design of circular polarization antenna are obtained. (2) A single feed point stereoscopic folded circular polarization antenna structure is proposed, which can guarantee the excellent half-power beam width and 3dB axial ratio beam width by patch folding.The relationship between patch folding and antenna beam width is analyzed, the design steps of single feed point stereoscopic folded circular polarization antenna are given, and the simulation results show that the half-power beam width of the antenna reaches 110 掳/ 3 dB axis ratio beam width above 200 掳.The test results are in good agreement with the simulation results, and the reliability of the simulation work is verified.The research work in this paper provides a new technical approach for the design of circular polarization antenna with wide axial ratio beam, and is helpful to the development of a new stereoscopic multiplanar circular polarization antenna.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN821.1

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