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简述天线民用GPS双频圆极化天线的设计本科论文
edgements90-92探讨生履历92              
摘要:近年来,GPS技术在海事卫星导航通信系统中的运用越来越广泛。GPS的现代化对GPS接收机提出了新的要求,于是,现代化GPS接收机成为人们设计探讨的对象。天线是接收机必不可少的组成部分,由此天线设计具有重要的运用价值。微带贴片天线具有成本低、体积小、剖面低、易于实现双频性能和圆极化等优点而被广泛运用于GPS天线中。本论文提出了两款圆极化贴片天线。第一种天线是工作在L1(1575.45MHz)和L5(1176.45MHz)的层叠结构正方形贴片天线,第二种是中心开槽小型贴片天线。本论文首先利用HFSS电磁仿真软件对频率为1575.45GHz的切角贴片天线进行了仿真,在该仿真结果的基础上利用HFSS仿真软件设计了两款天线。第一种GPSL1L5贴片天线由两个正方形贴片构成,两个探针馈电形成右旋圆极化天线。两个馈电点位于相互垂直的坐标轴上,这样就形成了两个幅度相等,相位相差90度的圆极化方式。第二种结构新颖的中心开槽小型贴片天线利用四周切角、单馈的方式产生右旋圆极化特性。天线采取开槽的办法实现了小型化的目的。仿真完成之后,对天线进行了实物加工,并利用Anritsu公司的MS2026矢量网络浅析仪进行了测试。本论文中给出了天线的全部仿真结果,并对小型开槽天线的仿真结果和测试结果进行了比较。结果表明这两款天线均满足GPS系统对天线的要求。 关键词:全球卫星定位系统(GPS)论文 微带天线论文 圆极化论文 卫星通信论文 导航论文
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    摘要5-6

    Abstract6-10

    Chapter 1 GPS System10-29

    1.1 General Introduction10-12

    1.2 GPS Overview12-18

    1.2.1 GPS Modernization14-15

    1.2.2 GPS Signal Characteristics15-18

    1.3 GPS Patch Antenna Parameters18-24

    1.3.1 Operating Frequency18

    1.3.2 Group Delay18-19

    1.3.3 Gain19

    1.3.4 Bandwidth(BW)19-20

    1.3.5 Voltage Standing Wave Ration(VSWR)20-21

    1.3.6 Axial Ratio(AR)21-22

    1.3.7 Polarization22-24

    1.4 Previous GPS Patch Antenna Designs24-26

    1.5 Thesis Objectives26-27

    1.6 Thesis Outpne27-29

    Chapter 2 Literature Review on Microstrip Patch Antenna29-47

    2.1 Introduction29

    2.2 Features of Microstrip Patch Antenna29-30

    2.3 Rectangular Microstrip Patch Antenna30-37

    2.3.1 Radiatioil Pattern Characteristics31-32

    2.3.2 Radiation Mechanism32-33

    2.3.3 Dimension(s) of the Patch33-36

    2.3.4 Substrate Materials36-37

    2.4 Models for Microstrip Patch Antenna37-38

    2.4.1 Cavity Model37

    2.4.2 Transmission Line Model37-38

    2.5 Feeding Methods for Microstrip Patch Antenna38-40

    2.5.1 Probe Feed38

    2.5.2 Microstrip Line Feed38-39

    2.5.3 Aperture Coupled Feed39

    2.5.4 Proximity Couppng39-40

    2.6 Circularly Polarized Rectangular Patch Antenna40-45

    2.6.1 Dual-Orthogonal Feed Circularly Polarized Patch Antenna40-41

    2.6.2 Singly-Fed Circularly Polarized Rectangular Patch Antenna41-43

    2.6.3 Feeding Technique Selection43-45

    2.7 Dual-Frequency Microstrip Patch Antenna45-47

    Chapter 3 Analytical Design Software47-54

    3.1 Ansoft HFSS Overview47-48

    3.2 Advantages of Ansoft HFSS48-49

    3.3 Simulation Process49-52

    3.3.1 Boundary Conditions and Excitations50-51

    3.3.2 Adaptive Meshing51-52

    3.4 Results52-53

    3.5 Additional Software53-54

    Chapter 4 Single-Frequency Patch Antenna Design54-73

    4.1 Introduction54

    4.2 Design of Antenna-Ⅰ54-60

    4.2.1 Simulation Setup of Antenna-Ⅰ58

    4.2.2 Tuning Process and Simulation Results58-60

    4.3 Design of Antenna-Ⅱ60-69

    4.3.1 Design Procedure61-63

    4.3.2 Simulation Setup and Results63-69

    4.4 Fabrication and Measurement of Antenna-Ⅱ69-73

    4.4.1 Comparison Between Simulation and Measurement Resulls71-73

    Chapter 5 Dual-frequency Patch Antenna Design73-82

    5.1 Introduction73-75

    5.2 Design Procedure75-77

    5.2.1 Design Parameters for Antenna-Ⅲ75-77

    5.3 Simulation Setup and Results77-82

    Chapter 6 Conclusion and Future Work82-84

    6.1 Conclusion82-83

    6.2 Future Work83-84

    References84-89

    Appendix A89-90

    Acknowledgements90-92

    探讨生履历92

sign54-734.1 Introduction544.2 Design of Antenna-Ⅰ54-604.2.1 Simulation Setup of Antenna-Ⅰ584.2.2 Tuning Process and Simulation Results58-604.3 Design of Antenna-Ⅱ60-694.3.1 Design Procedure61-634.3.2 Simulation Setup and Results63-694.4 Fabrication and Measurement of Antenna-Ⅱ69-734.4.1 Compari

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