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摘要为了设计应用于小型卫星通信系统的赋型环焦反射面天线，论文先分析了多模圆锥喇叭馈源的设计理论，然后在此基础上设计了 频段的喇叭馈源，并用基于有限元法的电磁仿真软件 HFSS计算了其方向图。由于设计赋型环焦反射面天线必须参考标准环焦反射面天线的几何参数，因此论文分析了标准环焦反射面天线的设计原理，并利用 C++语言编写了标准环焦反射面天线的设计软件。论文接着分析了赋型环焦反射面天线的设计原理，并对常用反射面口面分布函数进行了对比分析，确定了口面分布函数，并结合馈源方向图、标准环焦反射面天线的几何参数，利用 C++语言编写了赋型环焦反射面天线的设计软件。论文最后利用几何光学方法计算了赋型环焦反射面天线辐射方向图。计算结果与设计结果吻合验证了设计过程的正确性。59561
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毕业论文关键词：赋形环焦反射面天线、多模圆锥喇叭、馈源、口面分布函数、 辐射方向图 Ku
Title Design and Analysis of the Shaped Ring-focus Reflector Antenna Used in Satellite Communications
Abstract In order to design the shaped ring focus reflected antenna applied in the minor satellite communications system, firstly, the multi-modes conical horn used as the feed of the reflected antenna is analyzed in this thesis, and a multi-mode conical horn operating in the Ku-band is designed and its radiation pattern is obtained by the software HFSS based on the finite element method. Before designing the shaped ring focus reflected antenna, the geometrical parameters of normal ring focus reflected antenna should be provided for reference, therefore the design theory of the normal ring focus reflected antenna is analyzed and the design program based on C++ is achieved. Then the design theory of the shaped normal ring focus reflected antenna is analyzed, and the aperture field distribution functions of this designed reflected antenna is determined based on the comparison between these normal aperture field distribution functions. Combined with the radiation pattern of feed, the geometrical parameters of normal ring focus reflected antenna and so on the designing software for shaped ring focus reflected antenna is written by using C++ program. Lastly, the radiation pattern of the shaped ring focus reflected antenna is calculated based on the theory of Geometrical Optics. The agreement between the results of calculation and design shows the validity of the designing procedure.
Keywords: Shaped ring-focus reflector antenna, Multi-modes conical horn, Feed, Aperture field distribution functions, Radiation pattern
目录
１引言....1
1.1卫星通信系统对反射面天线的要求...1
1.2常规卫星通信反射面天线简析.1
1.3赋行环焦反射面天线在小型卫星通信系统中的优势3
1.4本文的主要工作4
2环焦反射面天线馈源设计5
2.1馈源喇叭形式选取.5
2.2主模圆锥喇叭设计原理...6
2.3双模圆锥喇叭设计原理...7
2.4双模圆锥喇叭设计.8
2.4.1双模圆锥喇叭参数选取..8
2.4.2双模圆锥喇叭HFSS仿真9
2.5双模圆锥喇叭的HFSS仿真数据分析..12
3标准环焦天线的设计和仿真....14
3.1引言...14
3.2副镜母线是椭圆的标准环焦天线特性分析....14
3.3副镜母线是椭圆的标准环焦天线的几何参数16
3.4副镜母线是椭圆的标准环焦天线设计..18
3.5副镜母线是椭圆的标准环焦天线的编程与仿真.21
3.5.1标准环焦天线设计流程21
3.5.2技术参数的输入..21
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