一种面向导航应用的电容耦合四点馈电的宽带双层微带天线  

A capacity coupling four-probes broadband dual-layers microstrip antenna for navigation applications

作　　者：王超[1] 艾永强[1] 张振杰[1] 郑伟[1] 杨文丽[1] WANG Chao;AI Yongqiang;ZHANG Zhenjie;ZHENG Wei;YANG Wenli(China Academy of Space Technology(Xi’an),Xi’an 710000,China)

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2021年第4期63-67,共5页Space Electronic Technology

基　　金：国家自然科学基金(编号:61627817)。

摘　　要：文章设计了一种电容耦合四点馈电的宽带双层微带天线,该天线可以工作在北斗、GPS、GALILEO和GLONASS四大导航卫星工作频段,可以用作导航系统地面终端天线。天线单元采用电容耦合四点馈电的双层空气微带圆极化天线形式,在双点谐振特性的双层空气微带天线基础上,结合电容耦合馈电技术构成三点谐振特性,进一步展宽天线带宽。为了实现低剖面、小型化、微带形式的宽带馈电网络采用双层结构集成设计,由Wilkinson功分器和宽带Schiffman移相器实现相应的幅相配置。对提出的天线进行了仿真设计和优化,仿真设计结果表明,在四大卫星导航卫星系统1.1 GHz~1.6 GHz工作频段内,天线电压驻波比小于1.4,增益方向图和圆极化轴比特性都满足设计要求,该天线可以很好地应用于地面多模用户终端。A capacity coupling four-probes broadband dual-layer microstrip antenna is proposed.This antenna can operates on the frequency of four satellite navigation systems(BEIDOU、GPS、GALILEO、GLONASS).And it can be used navigation system ground terminal antenna.In order to improve the impedance bandwidth and circularly polarization performances,Dual-layers,air substrate and four-probes capacity coupling are employed in this design.Based on the dual-layers microstrip antenna with dual resonant frequencies,The capacitive coupling feed technology is used to form triple resonant frequencies for enhancing the bandwidth of the antenna.To achieve low profile and miniaturization,dual-layers structure is adopted for the microstrip broadband feeding network,which consists of the Wilkinson power divider and the broadband Schiffman phase shifter to meet the ideal amplitude and phase requirements.The proposed antenna is simulated and optimized.The simulation results indicate that all the RF performance within the 1.1 GHz~1.6 GHz operating band of the four satellite navigation system can meet the target requirements.

关 键 词：电容耦合馈电 宽带 双层微带 地面终端天线 

分 类 号：V443[航空宇航科学与技术—飞行器设计]