小型化北斗导航圆极化天线研究

结合多种贴片开槽方案,采用正交馈电圆极化激励方式,实现了一款北斗B3(1 268.52±10)MHz频点导航天线的小型化设计。通过电磁仿真软件HFSS对其结构参数进行优化仿真分析,数值结果表明:小型化天线在B3处的顶空增益为3.69 dB,低仰角增益≥-1.5 dB(≤±70°),反射损耗小于-10 dB的带宽为20 MHz,带内轴比≤2 dB。该小型化天线贴片尺寸相比同介电常数基板的同频点未开槽天线缩小72.8%,具有一定的应用前景。

Research on circularly polarization microstrip antenna for miniaturized Beidou navigation system

Combining with the variety of slotting plans,a miniaturized designed of frequency point navigation antenna of Bei-dou-B3 frequency （1 268.52 ± 10 MHz） with the incentive method of circular polarization orthogonal feedback is realized. The structure parameter is simulated and analyzed through HFSS,the numerical result shows that the peak gain value at B3 is 3.69 dB, low elevation gain（±70°）≥-1.5 dB. The bandwidth is 20 MHz when the return loss is less than -10 dB,and the axial ratio value≤2 dB. The proposed antenna-size reduced by about 72.8% as compared to the no slot antenna with the same frequency point of the same dielectric constant substrate and at a given operating frequency,it has a certain application prospect.