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2022年 第17卷 第10期

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《工程（英文）》 >> 2022年 第17卷 第10期 doi: 10.1016/j.eng.2022.03.019

基于信息超表面设计理念的一种平面4比特可重构天线阵列

a State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China
b The Institute of Electromagnetic Space, Southeast University, Nanjing 210096, China

收稿日期： 2021-10-11 修回日期： 2022-02-17 录用日期： 2022-03-20 发布日期： 2022-07-16
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摘要

受信息超表面设计理念即数字编码概念的启发，一种具有0.15λ0（λ0为波长）低剖面的平面4比特可重构天线阵列被提出。这个阵列是基于由1比特磁电偶极子和小型化反射式移相器组成的数字编码辐射单元组成。通过对两个对称馈电端口单独馈电，所提出的1比特磁电偶极子能够在宽带范围内提供“0”和“1”两种数字状态。所涉及的反射式移相器可以提供173°的相对相移。通过在157.5°的相位范围内进行数字量化，可以进一步得到相移间隔22.5°的8种数字状态。为了实现低副瓣水平，一个基于泰勒线源方法的1:16功分器被用来给阵列馈电。我们加工并测试了所提出的4比特天线阵列样机，实验结果与仿真结果吻合很好。阵列能够实现±45°的扫角，12 GHz的最大增益为13.4 dBi，副瓣和交叉极化水平分别低于–14.3 dB和–23 dB。另外，波束指向误差在0.8°，法向波束的3–dB增益带宽为25%。由于阵列卓越的性能，它在雷达和通信系统中将有重要的应用前景。

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