机载宽波束圆极化微带天线设计
刘亭亭1 钱祖平1 赵 菲2
(中国人民解放军理工大学通信工程学院 南京 210007)1
(国防科技大学电子科学工程学院 长沙 410073 )2
摘 要：本文研究设计了一种宽波束圆极化微带天线，该天线工作在L波段，采用圆贴片辐射单元和正交H缝隙耦合馈电技术。仿真结果表明：该天线在8MHz工作频带内VSWR≤1.05，轴比≤0.25dB；轴比小于3.0dB的空域覆盖范围达129°，在工作频段0dB增益覆盖范围达到120°，实现了超低驻波比和宽波束圆极化天线设计。该天线结构紧凑，可广泛应用于飞机等民用导航系统。 关键词；H缝隙耦合，圆极化，轴比，宽波束
Design of Airborne Board beam Circularly Polarized Microstrip Antenna
Liu Tingting, Qian Zuping, Zhao Fei
(Communication Engineering Institute of Science Technology University PLA, Nanjing 21007) 1
(School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073) 2 Abstract: The board beam circularly polarized microstrip antenna is designed in L band. The circular radiation patch and the technique of orthogonal H-shape aperture couple are used. The simulation results show that: in 8MHz operation frequency band, the VSWR of the antenna is less than 1.05, the axial ratio is less than 0.25dB and is less than 3.0dB in 129°for space area, the gain is more than 0 dB in 120°for space area in operation frequency band. The super low VSWR and board beam circularly polarized antenna is achieved. The antenna which is compact can be widely used on plane, civil navigation system and so on.
Keywords: H-shape aperture couple, circularly polarized, axial ratio, board beam
介质板上，可以分别进行优化设计，且辐射部分与
1 引言
馈线部分由接地板隔开，馈线的寄生辐射弱，交叉极化水平低，更容易形成圆极化天线[2]。文献[6]设计
飞机在高速飞行过程中由于要与卫星时刻保持
出了基于矩形缝隙馈电的方贴片圆极化微带天线，
通信，所以对机载天线的性能要求很高。一般来说
文献[7]改进用H型缝隙馈电，使天线圆极化效果及
要求如下：高性能圆极化工作，高驻波比，宽波束，
后向辐射抑制比都有大幅度提高。
小体积、低剖面、便于携带和共形。
本文结合实际需求，设计了一种基于圆辐射贴
微带天线由于其本身具有结构简单、剖面低、
片的H形缝隙耦合的宽波束圆极化微带天线。通过
极化易控制、方向图覆盖范围广、制造容易 [1][2]，并