2022年 第11卷 第4期
《工程（英文）》 >> 2022年 第11卷 第4期 doi: 10.1016/j.eng.2020.10.014
面向高速机载通信系统的水平全向天线分集系统
a Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
b Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing 10084, China
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摘要
本文提出了一种由电磁学与空气动力学协同设计的水平全向双极化天线，可用于高速机载分集系统。天线主体结构包含探针馈电的金属腔和微带线馈电的横槽，可分别实现水平极化与垂直极化。此外，设计的双层超表面结构可作为人工磁导体边界，不仅尺寸紧凑，而且使天线具备可直接安装金属机身的能力。为提升天线流体力学性能，在天线表面贴附一楔形块结构，用于降低风阻。针对本文所提出的天线进行设计验证，实测结果与仿真结果一致。垂直极化的工作带宽在2.37~2.55 GHz的范围内，水平面方向图的增益不圆度为3.67 dB；水平极化的工作带宽在2.45~2.47 GHz的范围内，增益不圆度为3.71 dB。包含楔形块结构在内，天线整体尺寸为0.247λ0 × 0.345λ0 × 0.074λ0（其中λ0为中心频率下自由空间波长），两端口间的隔离度可达33 dB以上。本文所提出的天线分集系统兼具电磁学与空气动力学的性能优势，在高速机载通信应用中表现出优良潜力。
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