| Ka频段宽带圆极化微带天线 |
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| 引用本文： | 李小刚,金荣洪,梁仙灵,金泽阳,李建平,贺冲,陈靖峰.Ka频段宽带圆极化微带天线[J].电波科学学报,2022,37(6):1073-1079. |
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| 作者姓名： | 李小刚 金荣洪 梁仙灵 金泽阳 李建平 贺冲 陈靖峰 |
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| 作者单位： | 上海交通大学电子工程系，上海 200240 |
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| 基金项目： | 国家自然科学基金青年基金(62001291) |
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| 摘 要： | 面向Ka频段高通量卫星对天线的需求，设计了一种Ka频段宽带圆极化微带天线. 天线单元主要由圆形辐射贴片和缝隙耦合馈电结构组成，通过两个类T形缝隙结合实现宽带圆极化. 天线仅有三层金属层，结构简单. 仿真结果显示，天线单元的相对阻抗带宽为31.5%（25.1～34.5 GHz），相对3 dB轴比带宽为20.3%（26.5～32.5 GHz）. 由于单元尺寸较小，不便于对其性能进行验证，因此利用该天线单元组成2×2天线阵列，并进行加工测试. 仿真与试验结果表明，天线阵列阻抗带宽以及3 dB轴比带宽可以覆盖25.6～33.1 GHz频率范围，实测结果与仿真结果一致性良好.
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| 关 键 词： | Ka频段 卫星通信 圆极化 微带天线 阵列 |
| 收稿时间： | 2021-11-22 |
Ka-band broadband circularly polarized microstrip antenna |
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| Affiliation: | Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | Aiming at the demand of Ka-band high-throughput satellites for antennas, a Ka-band broadband circularly polarized microstrip antenna is designed. The antenna element is mainly composed of a circular radiating patch and a slot-coupled feed structure, where broadband circular polarization is achieved through the combination of two T-like slots. The antenna has only three metal layers and the structure is simple. The simulation results show that the relative impedance bandwidth of the antenna element is 31.5%(25.1?34.5 GHz), and the relative 3 dB axial ratio bandwidth is 20.3%(26.5?32.5 GHz). Due to the small size of the element, it is inconvenient to verify the performance of the designed antenna element, so it is used to form a 2×2 antenna array, and the processing test is carried out. Simulation and test results show that the antenna array impedance bandwidth and 3 dB axial ratio bandwidth can cover the 25.6?33.1 GHz frequency band, and the measured results are in good agreement with the simulation results. |
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