全球定但位系统中的小型介质加载四臂螺旋天线-电子科学与技术专业毕业论文.pdf.docx

浙江大学硕士学位论文 浙江大学硕士学位论文 镀覆铜膜、刻蚀螺旋臂、安装馈电结构及频率和相位微调。对所制成的样品天线 进行了测试，实测谐振频率为1576．62MHz，10dB带宽为5MHz，谐振点的回波 损耗达到．17．5dB；实测3dB波束宽度为120。，天顶增益为．3dBi；实测输入阻 抗为68．67．16．24j Q。对测量结果和理论数据进行了比较和分析，天线基本达到 设计要求，性能参数和结构尺寸满足小型化GPS接收机应用需要。 由于该天线的图形为立体结构，图形的制作十分困难，本研究创造性的采用 了激光刻蚀技术解决了螺旋臂；bN-r-和性能微调的难题，这为产业化生产这种天线 提供了一种新的工艺途径。另外，据目前文献检索：该天线尺寸最小，并保持良 好接收特性的优点，有望在GPS系统中得到应用，下一步产业化工作已经在有关 企业开展中。 关键词：四臂螺旋天线介质加载微波陶瓷激光刻蚀宽波束GPS 2 浙江大学硕士学位论文Abstract 浙江大学硕士学位论文 Abstract Global Positioning System(GPS)iS one of the most widely used satallite navigation and positioning system，which mainly applied in a variety of felds such as navigation,mapping，monitoring，time distribution，communication and SO on． Recently,GPS technology has been developed enormously in civil use，especially in vehicle navigation and personal mobile terminal positioning，which two are quite demanding of the miniaturization of antennas obviously．Among all the antennas． quadrifilar helix antenna is the ideal receiving antenna for GPS owing to the advantages of cardioid shaped paRem．good front．to．back ratio and excellent circular polarization． In this dissertation,we summarize the development and research conditions of quadrifilar helix antenna,and analyse its structure，working principle and performance characteristics．Besides．we design and fabricate a Miniature dielectrically．10aded quadrifilar helix Antenna．TKS kind of antenna,loaded by ceramic dielectric、析tIl lli曲permittivity,谢th good performance while the volume shrinks to one-sixth of the original one．Can be utilized in miniaturized GPS applicatiOIlS botll in Cellphone as well as PDAGPS． The main results of this dissertation are listed as follows： 111e working principle and miniaturation solution of quadrifilar helix antenna are investigated．The working principle of GPS and its signal characteristic are introduced and the general requirements of GPS for receiving antenna are summarized as following：the antenna could provide uniform response over approximately the entire upper hemis