宽频带圆极化缝隙螺旋天线的设计  

Design of a Wideband Circularly Polarized Slot Helix Antenna

作　　者：袁家德[1] 陈圳鹏 邱凯翔 YUAN Jia-de;CHEN Zhen-peng;QIU Kai-xiang(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福州大学物理与信息工程学院,福州350116

出　　处：《微波学报》2022年第2期24-27,32,共5页Journal of Microwaves

基　　金：国家自然科学基金(62071125);福建省高校产学合作项目(2019H6007)。

摘　　要：研究了一种宽阻抗带宽和宽圆极化轴比带宽的缝隙螺旋天线。天线印制在由FR4介质基板构建的方形柱状结构的内外表面,两组长短不同的缝隙螺旋臂印制在介质基板外表面并延伸至天线顶部;一条弯折的微带线作为馈电网络印制在介质基板内表面,通过对各缝隙耦合馈电,实现天线宽阻抗带宽和轴比带宽。实测结果表明:天线尺寸为0.111λ_(0)×0.111λ_(0)×0.221λ_(0)(λ_(0)为北斗B2中心频率1.207 GHz对应的自由空间波长),S_(11)≤-10 dB的阻抗带宽为1.158~1.778 GHz,轴比≤3 dB的圆极化带宽为1.133~1.918 GHz。该天线采用缝隙螺旋结构,通过简易的馈电网络实现天线小型化和宽频带特性,在卫星导航系统中具有较好的应用前景。In this paper, a wideband circularly polarized slot helix antenna is proposed. The antenna is printed on the inner and outer surfaces of a square columnar structure with FR4 dielectric substrates. Two sets of helical slots are etched on the outer surface of the substrate, and the end of the slot is extended to the top surface of the proposed antenna. The feedline is a folded microstrip line that is printed on the inner surface of the dielectric substrate, and the wide impedance bandwidth and axial ratio bandwidth of the antenna are obtained with coupling feeding of every slot. The antenna size is 0.111λ_(0)×0.111λ_(0)×0.221λ_(0)(λ_(0)is the free-space wavelength at the center frequency of Beidou B2). The test results show that the S_(11)≤-10 dB bandwidth is 1.158-1.778 GHz and the axial ratio(AR)≤3 dB bandwidth is 1.133-1.918 GHz. The proposed antenna adopts a slot helix structure and has a small dimension, a wide impedance bandwidth and axial ratio bandwidth with a simple feed network and can find applications in satellite navigation systems.

关 键 词：全球导航卫星系统 缝隙螺旋天线 小型化天线 圆极化天线 宽频带天线 

分 类 号：TN823[电子电信—信息与通信工程]