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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
Zheng Xing Wang, Hanqing Yang, Ruiwen Shao, Jun Wei Wu, Guobiao Liu, Feng Zhai, Qiang Cheng, Tie Jun Cui
工程（英文） ›› 2022, Vol. 17 ›› Issue (10) : 64-74.
PDF(3666 KB)
PDF(3666 KB)
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 Planar 4-Bit Reconfigurable Antenna Array Based on the Design Philosophy of Information Metasurfaces
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。
Inspired by the design philosophy of information metasurfaces based on the digital coding concept, a planar 4-bit reconfigurable antenna array with low profile of 0.15 λ0 (where λ0 is the wavelength) is presented. The array is based on a digital coding radiation element consisting of a 1-bit magnetoelectric (ME) dipole and a miniaturized reflection-type phase shifter (RTPS). The proposed 1-bit ME dipole can provide two digital states of “0” and “1” (with 0° and 180° phase responses) over a wide frequency band by individually exciting its two symmetrical feeding ports. The designed RTPS is able to realize a relative phase shift of 173°. By digitally quantizing its phase in the range of 157.5°, additional eight digital states at intervals of 22.5° are obtained. To achieve low sidelobe levels, a 1:16 power divider based on the Taylor line source method is employed to feed the array. A prototype of the proposed 4-bit antenna array has been fabricated and tested, and the experimental results are in good agreement with the simulations. Scanning beams within a ±45° range were measured with a maximum realized gain of 13.4 dBi at 12 GHz. The sidelobe and cross-polarization levels are below –14.3 and –23 dB, respectively. Furthermore, the beam pointing error is within 0.8°, and the 3-dB gain bandwidth of the broadside beam is 25%. Due to its outstanding performance, the array holds potential for significant applications in radar and wireless communication systems.
4比特可重构天线阵列 / 信息超表面 / 数字编码方法 / 低副瓣 / 低剖面
4-Bit reconfigurable antenna array / Information metasurface / Digital coding method / Low sidelobe / Low profile
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