摘要
为满足机载多频卫星导航天线低剖面要求,设计并实现了一款层叠式北斗多频圆极化微带天线。该天线工作频率覆盖了北斗卫星导航系统S频段(2492±4 MHz)、L频段(1616±4 MHz)、B1频段(1561±2 MHz)与B3频段(1268±10 MHz)。设计采用短路隔离环的方法,提高天线在4个导航频段工作时的隔离度。所设计的天线在B1、L和S频段采用单点馈电,通过微扰方式实现圆极化;而在B3频段采用双点馈电,通过3 dB 90°电桥实现圆极化设计。通过对每层天线加载环形短路柱,在确保各频段间隔离度的同时起到防雷击作用。通过在辐射贴片上加载径向带线,调节各层贴片谐振频率。测试结果表明,在B3、B1、L1与S频段内,回波损耗小于-15 dB,频段内法向圆极化增益大于4 dBic,法向±60°波束范围内增益大于-2.5 dBic,法向轴比小于3 dB,满足机载卫星导航终端设备应用需求。
In order to meet the requirement of low profile of airborne multi-frequency satellite navigation antenna,a stacked BeiDou multi-band circularly polarized microstrip antenna is designed and implemented.The operating frequencies of the antenna cover S-band(2492±4 MHz),L1 band(1616±4 MHz),B1(1561±2 MHz)and B3(1268±10 MHz)of the BeiDou Navigation System.The low profile is acheived by using high dielectric constant substrate.Thus,the total height of the proposed antenna is 10.5 mm(including feed network).According to the bandwidth requirements of different bands,the B1,L and S frequency bands are fed by single feed,and the circular polarization is realized by introducing perturbation.The B3 frequency band patch adopts dual feeds and 3 dB 90°bridge to achieve circular polarization.The short pins on each layer of antenna are loaded to improve the isolation of patches,and play the role of lightning protection.The resonant frequency of each layer is adjusted radial branches which is etched on the patch.The measured results show that the return loss is less than-15 dB in B3,B1,L1 and S frequency band,and the normal circularly polarization gain is greater than 4 dBic in these frequency bands,the gain in the normal±60°beam range is greater than-2.5 dBic,and the normal axial ratio is less than 3 dB.It can meet the needs of airborne satellite navigation terminal equipment.
作者
关小龙
武建锋
吴华兵
赵爱萍
GUAN Xiao-long;WU Jian-feng;WU Hua-bing;ZHAO Ai-ping(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《时间频率学报》
2025年第2期157-166,共10页
Journal of Time and Frequency
基金
中国科学院青年创新促进会(1188000WHB)。
关键词
低剖面
层叠式
圆极化
短路柱
径向带线
low profile
stacked
circularly polarized
short pins
radial branches
