摘要
文章提出了一种新型宽带圆极化微带天线的设计。该天线应用于当前4种卫星定位导航系统(GPS、GLONASS、Galileo、Compass),提高了卫星定位导航系统的定位精确性,并解决了单一系统覆盖空白的问题。采用天线和馈电网络分开的设计思路,使用电缆连接,消除了传统设计中馈电网络对辐射方向图的影响。天线部分采用矩形微带贴片结构,在辐射贴片四周对称位置开矩形缝隙,从而提高了微带天线的阻抗带宽;馈电部分采用四功分相移网络均匀馈电,大大改善了圆极化带宽和圆极化纯度。利用高频仿真软件HFSS进行仿真优化,仿真结果显示,其阻抗带宽达到了48.6%(S11<-10 dB),在工作频带内天线增益高于6 dB,圆极化性能良好,能够满足多模卫星定位导航系统的要求,具有良好的应用价值。
A novel wideband circularly polarized microstrip antenna is proposed in this paper. The anterma is designed to operate for multi-mode satellite navigation frequencies in L-band including GPS, GLONASS, Galileo and Compass. It improves the accuracy of global navigation satellite system（GNSS） and solves the blank coverage problem. The separate structure of antenna and feed network eliminates the influence of network parasitic radiation on antenna directivity. Four narrow slots are etched on the radiating patch symmetrically to expand impedance bandwidth. The balance-feed by 4-port power-dividing phase shift network is used to improve circularly polarized bandwidth and circularly polarized purity. This antenna is simulated and optimized by high frequency simulation software HESS. The simulation results show that the proposed antenna can achieve 48. 6% impedance bandwidth （S11〈-10 dB）, its antenna gain is more than 6 dB during the whole work band, and the circularly polarized performance is excellent. The antenna is suitable for GNSS and promising in application.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第3期391-394,共4页
Journal of Hefei University of Technology：Natural Science
关键词
卫星导航
微带天线
宽带
馈电网络
satellite navigation
microstrip antenna
wideband
feed network
