卫星导航终端小型化开口缝隙螺旋天线

Miniaturized Open Slot Helix Antenna for Satellite Navigation Terminal

中文关键词:  缝隙螺旋天线  开口缝隙  耦合馈电  圆极化  小型化  卫星导航终端

英文关键词:slot helix antenna  open slot  coupling feeding  circular polarization  miniaturization  satellite navigation terminal

中文摘要:

      研究了一种小型化卫星导航终端开口缝隙螺旋天线。 天线主体为四条宽度渐变的开口缝隙螺旋臂,蚀刻在外表面覆铜的介质基板围成的方型结构上,由印制于介质基板内表面的微带线结构馈电网络进行耦合馈电;馈电网络由底面回形结构和侧面逐渐向上变宽的折形结构组成,使用同轴线接头在天线底部对其馈电。 天线总体尺寸为 26 mm×26 mm×29 mm,实测结果表明: | S11 |≤-10 dB 的阻抗带宽为 7. 88%(1. 523 GHz ~ 1. 648 GHz),轴比≤3 dB 的圆极化带宽为20. 26%(1. 490 GHz~ 1. 826 GHz),在北斗B1 频段中心频率(1. 561 GHz)、GPS L1 频段中心频率(1. 575 GHz)和GLONASS L1 频段中心频率(1. 602 GHz)处增益分别达到 3. 33 dBi、3. 18 dBi 和 2. 79 dBi。 该天线采用开口缝隙螺旋结构,通过简单的馈电网络串行耦合馈电实现天线的圆极化,在较小尺寸情况下实现了较宽的带宽和较好的增益。

英文摘要:

      In this paper, a miniaturized open slot helix antenna for satellite navigation terminal is proposed. The main body of the antenna consists of four open slot helix arms with gradual widths, printed on a square structure surrounded by a copper-covered dielectric substrates while the feeding network printed on the inner surface of the medium for coupling feeding. The feeding network consists of a looped structure on the bottom and a folded structure with a widened and upward side, which is fed at the bottom of the antenna using a coaxial connector. The size of the antenna is 26 mm×26 mm×29 mm. The measured results show that the impedance bandwidth of | S11 |≤-10 dB reaches 7. 88% (1. 523 GHz ~ 1. 826 GHz), and the circular polarization bandwidth with an axial ratio ≤3 dB is 20. 26% (1. 490 GHz~ 1. 826 GHz) . The gain at the center frequency of Beidou B1 (1. 561 GHz) , GPS L1 (1. 575 GHz) and GLONASS L1 (1. 602 GHz) are 3. 33 dBi, 3. 18 dBi and 2. 79 dBi respectively. The antenna adopts an open-slot helix structure, realizes the circular polarization of the antenna through serial coupling and feeding of a simple feeding network, and achieves wide bandwidth and better gain in the case of small size.