新型双波段卫星通信天线的建模、仿真和优化

发布时间：2018-10-15 15:09

【摘要】：当前,卫星通信由于其诸多优点越来越多地应用在应急通信、全球远距离通信、军事通信等领域。卫星通信频段分布较多,为了进一步开拓太空卫星资源,国家在UHF波段卫星通信领域进行了相应的开发。现阶段,UHF波段卫星通信采用圆极化卫星通信天线,圆极化天线具有良好的抑制雨雾的去极化效应和抗多径反射效应等特点。本课题旨在设计一款具有良好圆极化特性、较宽频带和较高增益的UHF卫星通信天线。首先,论文介绍了当前卫星通信天线的发展及动态,提出了本课题研究的目的和意义,同时对论文研究的主要内容和论文的结构安排进行了说明。其次,结合本课题在天线设计中所使用的Ansoft HFSS天线仿真软件,对Ansoft HFSS的基本概念、特点和使用方法等作了介绍。接下来,介绍了天线及阵列天线的基本理论和概念,对天线、直线阵和平面阵的一些主要参数进行分析说明。特别地,对本课题采取的印刷偶极子天线、缝隙天线、电磁互补型天线、Wilkinson功分器和阻抗变换器进行了详细的说明。最后,阐述了新型双波段卫星通信天线的具体建模仿真和优化设计工作。分三部分研究分析:新型电磁偶极子天线单元、阵列馈电网络、阵列天线布局与间距。分析电磁偶极子天线的模型、原理、带宽特性、圆极化和增益特性等;分析馈电网络的反射特性和传输特性,对其中的微带型Wilkinson功分器进行了优化分析;分析阵列天线的阵列布局和阵元间距对阵列天线性能的影响。对于本课题的卫星通信阵列天线如何满足要求做了大量工作,利用Ansoft HFSS对天线关键参数进行了优化分析,得出了大量的数据,并研制出了最终的天线。
[Abstract]:At present, satellite communication is more and more used in emergency communication, global remote communication, military communication and other fields because of its many advantages. There are many frequency bands in satellite communication. In order to further develop the space satellite resources, the country has carried on the corresponding development in the UHF band satellite communication domain. At present, circularly polarized satellite communication antenna is used in UHF band satellite communication. Circular polarization antenna has good characteristics of restraining depolarization effect of rain and fog and anti-multipath reflection effect. The purpose of this paper is to design a UHF satellite antenna with good circular polarization, wide band and high gain. Firstly, the paper introduces the development and development of satellite communication antenna, puts forward the purpose and significance of this research, and explains the main contents and structure of the thesis. Secondly, combined with the Ansoft HFSS antenna simulation software used in antenna design, the basic concept, characteristics and application methods of Ansoft HFSS are introduced. Then, the basic theory and concept of antenna and array antenna are introduced, and some main parameters of antenna, linear array and plane array are analyzed and explained. In particular, the printed dipole antenna, slot antenna, electromagnetic complementary antenna, Wilkinson power divider and impedance converter are described in detail. Finally, the modeling, simulation and optimization design of the new dual-band satellite communication antenna are described. It is divided into three parts: new electromagnetic dipole antenna unit, array feed network, array antenna layout and spacing. The model, principle, bandwidth, circular polarization and gain characteristics of the electromagnetic dipole antenna are analyzed, the reflection and transmission characteristics of the feed network are analyzed, and the microstrip Wilkinson power divider is optimized. The effect of array layout and array cell spacing on array antenna performance is analyzed. A great deal of work has been done on how to meet the requirements of the satellite communication array antenna in this paper. The key parameters of the antenna are optimized and analyzed by Ansoft HFSS, a large number of data are obtained, and the final antenna is developed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN828.5

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