一种船用BDS-GPS双频四臂螺旋天线.doc

一种船用BDS/GPS双频四臂螺旋天线

【摘要】设计了一种双频自相移式四臂螺旋天线模型,并进行了加工,结合仿真与实验分析了该天线的阻抗、增益、方向性等参数。仿真结果与实验结果具有较好的一致性,该天线主瓣波束宽度可以达到160°,且旁瓣很小。另外,该四臂螺旋天线在大仰角范围内具有良好的右旋圆极化性能。 GHz双频通信,各个频段的带宽约为60 MHz。
中国论文网/8/view-
【关键词】四臂螺旋天线;可控性;北斗
中图分类号: U665 文献标识码: A 文章编号: 2095-2457(2017)26-0016-002
A Marine BDS / GPS Dual Frequency Four-armed Helical Antenna
SONG Lu CHANG Yong-meng DING Si-yu WANG Yu-hao ZHAO Jian-sen
(Merchant Shipping School,Shanghai Maritime University,Shanghai 201306,China)
【Abstract】A dual-frequency self-phase shifting quadrifilar helix antenna model is designed and impedance,gain,directivity and other parameters of the antenna are analyzed by simulation and simulation results are in good agreement with the experimental beam width of the main lobe of the antenna can reach 160° and the side lobe is addition,the quadrifilar helical antenna has good right-handed circular polarization performance at a wide range of elevation can perform dual-munications from GHz and GHz with bandwidths of approximately 60 MHz in each band.
【Key words】Four-arm helical antenna;Controllability;Beidou
0 引言
船用BDS/GPS终端在不断完善的同时,也促进了船载天线的不断发展。首先,BDS/GPS[1]系统天线需要圆极化,在抗干扰,抗多径或者多路复用有一定优势。圆极化天线可以收到多种极化模式的信号,如水平极化、垂直极化等。当入射波遇到反射体(如船体和海平面)反射时,而且当入射角小于Brewster角[2,3]时,圆极化波的旋向具有正交性,如右旋圆极化波经反射改变成左旋