一种单层双频宽带GNSS测量型天线设计

基于单介质层结构,设计了一款双频宽带全球卫星导航系统(GNSS)测量型天线,天线采用单层高性能轻质复合材料作为双频微带天线共用的辐射介质基板。双频辐射贴片单元采用共面齿轮结构设计,并在天线单元外围设置一系列短路销钉来有效改善天线轴比带宽、低仰角辐射增益等参数,四馈点馈电技术和宽带耦合相移馈电网络的应用保证了天线相位中心稳定度更加可靠。设计结果表明,该双频天线单元大于等于5 d Bi的辐射增益带宽均大于245 MHz,高低频3 d B轴比带宽分别为-76°~76°和-116°~116°,低仰角90°增益滑落均小于11.5 d B,经实物样机对比测试分析,实测结果与仿真结果基本吻合。实测频谱显示,该天线工作频段覆盖目前在运行的四大导航系统全部工作频点,较好满足GNSS精确测量与定位系统终端设备应用需求。

Design of a monolayer dual-frequency broadband antenna with surveying for GNSS

A monolayer broadband antenna with surveying for global navigation satellite system(GNSS) is presented,and a monolayer high-performance composite is chosen as the common dielectric substrate of the dual-frequency microstrip antenna.Dual-band radiation patches use a coplanar sawtooth structure,and some short- circuit probes distributed on the edge of the antenna can improve axial-ratio bandwidth and low elevation gain of antenna.The four-feed network is designed to achieve a stability reliable phase center of antenna.The 5 dBi radiation gain bandwidths of dual-frequency antenna are both greater than 245 MHz,and the 3 dB axial-ratio bandwidth of high-frequency antenna unit and of low-frequency antenna unit are -76°~76°and -116°~116° respectively,and the gain slide of antenna is less than 11.5 dB in low angle of elevation for 90°.The experimental results show that the simulation results and the testing results are in agreement.The measured spectrum shows that the developed antenna can cover all corresponding operating bandwidth for GNSS.Especially it is suitable for the terminal equipment of precision measurement and positioning for GNSS.