新型宽带宽波束圆极化卫星导航终端天线的设计与实现

Novel Design and Realization of Wideband and Wide Beam Circular Polarization Antenna for Satellite Navigation Terminal System

卫星通信与卫星定位系统的应用发展,对终端设备天线的性能提出了更高的应用需求。为实现宽频带宽波束圆极化天线的设计,采用正交移相馈电网络对含有背腔的交叉偶极子天线馈电,实现了宽带圆极化单向辐射特性,同时利用磁电偶极子对交叉偶极子进行加载,展宽了天线的波束宽度,促使天线在50.7%的相对带宽内S11<-10dB,在1.3~1.75GHz的频带内轴比小于3dB,轴比小于3dB的圆极化波束宽度可达180°,增益不小于6.6dB。经实测验证,所设计的天线具有宽频带宽波束特性,同时具有结构紧凑、性能稳定的优点,适用于卫星通信与导航终端系统。

With the application development of satellite communication and satellite positioning systems,higher application requirements are put forward for the performance of terminal antennas.In order to realize the design of a wideband and wide-beam circularly polarized antenna,an orthogonal phase-shifted feed network is adopted to feed the cross-dipole antenna with a cavity-backed,achieving broadband circularly polarized unidirectional radiation characteristics,meanwhile using the cross dipole loaded with magnetic dipole to broadens the beam width of the antenna.A relative bandwidth of 50.7%(S11<-10dB)and axial ratio less than 3dB in the frequency of 1.3~1.75GHz is achieved,while the circularly polarized beam width can reach 180°and the gain is not less than 6.6dB.It has been verified through the actual measurement that the designed antenna has wide band and wide beam characteristics,at the same time,it has the advantages of compact structure and stable performance,which is suitable for satellite communication and navigation terminal systems.