Jiang Huixia, Sheng Lili, Luo Yumei, Meng Liang, Cao Weiping
Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China.
School of Electronic Information and Automation, Guilin University of Aerospace Technology, Guilin 541004, China.
Materials (Basel). 2023 Jun 27;16(13):4633. doi: 10.3390/ma16134633.
Due to the growing scarcity of spectrum resources in the low-frequency band, the requirement of beam-reconfigurable antennas in the millimeter wave band is urgent. In this paper, a W-band graphene-based metasurface working in a broad bandwidth is proposed with reflective amplitude coding. Here, graphene sheets play a dual role in radiating and regulating electromagnetic waves. By adjusting the Fermi levels of graphene, the reflective amplitude and phase of the metasurface can be modulated simultaneously, enabling multi-beam switching and beam deflection in far-field. The proposed metasurface achieves amplitude-phase modulation within a significantly wide bandwidth which covers 75-91.5 GHz and 99.3-115 GHz. By optimizing the coding patterns, the proposed graphene-based metasurfaces are able to not only realize 2-D beam steering, but also achieve beam switching from single beam to four beams at 87 GHz. The proposed design provides a novel solution for the flexible manipulation of millimeter waves, which can be applied to various fields such as vehicle radar, satellite communication, 6G wireless communication, and beyond.
由于低频段频谱资源日益稀缺，毫米波频段对波束可重构天线的需求迫切。本文提出了一种基于石墨烯的W波段超表面，采用反射幅度编码，工作在宽带宽内。在此，石墨烯片在辐射和调节电磁波方面发挥双重作用。通过调整石墨烯的费米能级，可以同时调制超表面的反射幅度和相位，实现远场中的多波束切换和波束偏转。所提出的超表面在75 - 91.5 GHz和99.3 - 115 GHz的显著宽带宽内实现幅度 - 相位调制。通过优化编码图案，所提出的基于石墨烯的超表面不仅能够实现二维波束转向，还能在87 GHz实现从单波束到四波束的波束切换。所提出的设计为毫米波的灵活操控提供了一种新颖的解决方案，可应用于车辆雷达、卫星通信、6G无线通信等各种领域。
