应用于北斗和GPS的双频小型圆极化微带天线

介绍了一款能同时应用于北斗卫星导航系统B₃频段(1 268 MHz,±10 MHz)和全球卫星导航系统(GPS)L₁频段(1 575 MHz,±2 MHz)的双频小型圆极化微带天线,并通过叠层技术实现了天线的双频工作性能。采用相对介电常数为9.7的介质材料和表面开槽技术减小了天线尺寸,达到了小型化的要求。通过切角的方法实现了天线的右旋圆极化工作方式。同时,利用基于有限元法的HFSS仿真软件对天线进行了参数仿真和调试。仿真结果表明,在B₃频段天线具有2.2%的阻抗带宽(VSWR<2)和0.5%的3 dB轴比带宽,在L₁频段天线具有3.1%的阻抗带宽(VSWR<2)和0.5%的3 dB轴比带宽。天线仿真结果满足北斗和GPS指标要求,因此具有良好的应用前景。

A Miniaturized Dual-frequency Circularly Polarized Microstrip Antenna for Beidou and GPS Applications

A compact dual-band circularly polarized patch antenna for both Beidou Navigation System B3 band （1 268 MHz ±10 MHz） and Global Position System LI band （1 575 MHz±2 MHz） is proposed in this paper. Two stacked microstrip layers are employed in the antenna structure to implement the dual-frequency operation. By selec- ting the material with relative dielectric constant of 9.7 and embedding slots in the patch surface, the size of the re- quired antenna can be reduced and miniaturization can be achieved. Good right-hand circular polarization （RHCP） contributes to truncating comers in the square patch. FEM based HFSS is used for the simulation and parameters op- timization analysis of the antenna structure. The simulation results show that the antenna has 3 dB AR BW of 0. 5 % and 2. 2% impedance bandwidth （VSWR 〈 2） in the B3 band. In the Ll band, the antenna achieves 3 dB AR BW of 0.5% and 3.1% impedance bandwidth （VSWR 〈 2）. All the simulation results meet the Beidou and GPS appli- cations very well and the antenna has a good application prospect.