全向圆极化微带天线的设计

发布时间：2018-05-02 17:15

本文选题：微带天线 + 全向天线　；参考：《安徽大学》2017年硕士论文

【摘要】：天线作为无线通信链路的前端设备,受到了越来越多的关注。在诸多天线类型中,兼具全向性和圆极化特性的全向圆极化天线以其自身出众的优势,获得了广泛的应用。本文主要针对无线通信中的全向圆极化微带天线设计、分析与实现技术进行了研究,并设计了两款全向圆极化微带天线。论文的主要工作如下:(1)论文首先在讨论了全向圆极化天线研究背景和现状的基础上,详细介绍了微带天线的辐射原理与基本参数以及微带天线的馈电方式。接着分析了全向圆极化天线实现的基本理论和微带天线宽频带、小型化性能的实现技术。(2)在理论研究的基础之上,提出了一款中心馈电的全向圆极化微带天线。天线通过对称加载四组L型槽和短路销钉,实现了全向圆极化的辐射特性。同时,通过在天线四周加载四组连续放置的寄生单元,改善了天线的阻抗匹配。实验结果表明,该天线10dB阻抗带宽和3dB轴比带宽分别为8.2%和9.2%。(3)基于双层结构模型,提出了一种宽带全向圆极化微带天线。天线包含一个底部加载的同轴探针、四个短路销钉和两对带有圆弧形振子的领结形贴片。以中心耦合馈电的领结形天线为基础,对称地加载四个短路销钉和圆弧形振子,获得了一个垂直极化波和一个水平极化波,实现了天线的全向圆极化性能;通过合并天线的TM01模式和TM02模式,实现了较宽的工作带宽。寄生单元的加入,同样改善了天线的阻抗匹配。该天线工作在2.4 GHz-WLAN频段,通过加工与测量,结果表明,该天线1OdB阻抗带宽和3dB轴比带宽分别为16.5%和20.5%。
[Abstract]:As a front-end device for wireless communication links, antenna has attracted more and more attention. In many antenna types, omnidirectional circular polarized antenna with omnidirectional and circular polarization characteristics has been widely used for its outstanding advantages. This paper mainly focuses on the design, analysis and implementation of omnidirectional circular polarized microstrip antenna in wireless communication. Two omnidirectional circular polarized microstrip antennas are designed. The main work of this paper is as follows: (1) first, on the basis of discussing the background and current situation of the omnidirectional circular polarized antenna, the radiation principle and basic parameters of the microstrip antenna and the feeding mode of the microstrip antenna are introduced in detail. Then the omnidirectional circular polarization is analyzed. The basic theory of antenna realization, the broadband band of microstrip antenna and the realization of miniaturized performance. (2) on the basis of theoretical research, a center fed omnidirectional circular polarized microstrip antenna is proposed. By loading four groups of L slots and short circuit pins symmetrically, the radiation characteristics of the omnidirectional circular polarization are realized. At the same time, the antenna is added in the antenna for four weeks. Four groups of continuous parasitic units are carried to improve the impedance matching of the antenna. The experimental results show that the 10dB impedance bandwidth and the 3dB axis ratio bandwidth are 8.2% and 9.2%. (3), respectively, based on the double layer structure model, and a broadband omnidirectional circular polarized microstrip antenna is proposed. The antenna contains a coaxial probe loaded at the bottom, four short circuit pins and two. On the basis of a tie shaped antenna fed by a central coupling, four short circuited pins and a circular arc oscillator are loaded symmetrically, and a vertical polarization wave and a horizontal polarization wave are obtained. The antenna's omnidirectional circular polarization performance is realized. The width of the antenna is realized by combining the TM01 mode and the TM02 mode of the antenna. The working bandwidth of the parasitic unit also improves the impedance matching of the antenna. The antenna operates at the 2.4 GHz-WLAN band, and the results show that the antenna's 1OdB impedance bandwidth and the 3dB axis ratio are 16.5% and 20.5%., respectively.

【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN822

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