一种用于“北斗”卫星导航系统的小型化微带贴片天线

基于“北斗”天线小型化的考虑，利用高介陶瓷基板（εr=16）来设计“北斗”卫星导航系统微带贴片天线，该天线采用切角结构，同轴线馈电方式，工作在“北斗”一代的S频段（2 492 ± 5 MHz,右旋圆极化）。采用Ansoft公司三维电磁仿真软件HFSS进行仿真分析，数值仿真结果表明： S11<-10 dB的阻抗带宽为62 MHz，3 dB极化轴比带宽为15 MHz；采用矢量网络分析仪对天线实物进行性能测定，实测结果表明，S11<-10 dB的阻抗带宽为66 MHz，3 dB圆极化轴比带宽为12 MHz，仿真结果与测试结果基本吻合，天线性能良好，满足“北斗”接收天线设计要求。该天线在满足北斗接收天线的性能的同时，由于采用高介陶瓷作为基板，使得其与传统天线相比，尺寸缩减了75%，具有一定的应用前景。

A Miniaturized Micro-strip Antenna for Beidou (Compass) Navigation Satellite System (CNSS)

In view of miniaturization considerations, in this paper, we present a miniaturized CNSS micro-strip antenna based on high permittivity (permittivity is 16) ceramic substrate. This antenna works at S Band (2 492± 5 MHz, right-handed circularly polarization). Numerical results show that impedance bandwidth (S11<-10 dB)and 3 dB axial ratio bandwidth are about 62 MHz, 15 MHz, and the measured results show that impedance bandwidth (S11<-10 dB)and 3 dB axial ratio bandwidth are about 66 MHz, 12 MHz, respectively. The measured results fit well with the simulation results obtained from HFSS. This antenna can fully meet the requirement of CNSS. In addition, by using high permittivity ceramic as the substrate, the antenna has the same performances but its scale is reduced to 75% compared with the traditional ones. Such advantages make it proper to practical applications.