一种用于全球卫星定位系统的三频微带天线

Tri-band Microstrip Antenna for GPS Application

设计了一款用于全球卫星定位系统(GPS)的单点馈电圆极化微带天线,它是由四块基片叠层构成的,其中,最下面一层基片上是单点馈电的四端口混合环的馈电网络,提供天线圆极化所需要的90°相移的两路等幅信号,其它基片上分别有一方形辐射贴片,实现天线的三频工作。仿真结果表明:该天线可覆盖L1\L2\L5等3个GPS频段,每个频段的工作带宽不小于24MHz;在(1.17-1.6)GHz频带内电压驻波比不大于2,有良好的阻抗匹配特性;此外,天线的波束宽度和圆极化性能满足指标要求。

A single feed circularly Polarized Antenna is proposed for GPS application.It is composed of four substrates.The bottom layer of the antenna is a single-fed four-port hybrid ring in order to provide the required equal amplitudes and 90° phase shift signals for circular polarization.Other substrates,respectively,has a square patch to achieve the tri-band performance.The simulated results show that:the antenna can cover all GPS bands(L1\L2\L5),which has 24MHz bandwidth on each operating frequency.It has good impedance matching characteristics in(1.17-1.6)GHz band,because the VSWR is less than 2;In addition,the properties of beam width and circular polarization all can meet the demand.