一种全金属低剖面圆极化天线

An All-Metal Low-Profile Circularly Polarized Antenna

摘要: 本文提出了一种全金属单馈圆极化天线。该天线利用缺陷结构改变辐射片原有的电场分布，从而实现了单馈圆极化特性。此外，在末端加载短路柱从而改善阻抗匹配，通过弯折结构能够降低剖面，以满足天线在有限空间安装。利用HFSS仿真软件进行优化仿真，结果显示该天线在960~1,460 MHz频带内VSWR < 2，且剖面仅为中心工作频率所对应波长的10%，仿真结果表明该天线在实现低剖面的基础上具有良好的电性能指标，未来在扁平式平板卫星通信领域具有广阔的应用前景。

Abstract: A novel all-metal single feed circularly polarized antenna is presented in this paper. The antenna adopts the defect structure and the structural post to accomplish the design of the broadband circularly polarized antenna, and which has simple feeding structure by adopting the coaxial feeding. By introducing the top-loaded fold, compact structure and low profile is generated to meet drastic volume constraints. Simulation results show that the antenna can achieve 960 MHz~1,460 MHz bandwidth for Voltage Standing Wave Ratio (VSWR) < 2, and the profile height of the proposed antenna is only 0.1 λ₀ (λ₀ refers to the wavelength of the center frequency in free space). These results indicate that the proposed antenna yields good circular polarization performance, and which has the characteristics of low profile. Further, the solutions can be scaled to large arrays on low Earth orbit satellite communication.