A reconfigurable ultra-wideband high-purity multimode terahertz OAM antenna array based on graphene and vanadium dioxide

IF 3 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Aeu-International Journal of Electronics and Communications Pub Date : 2024-09-07 DOI:10.1016/j.aeue.2024.155514

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Abstract

A reconfigurable ultra-wideband multimode terahertz OAM antenna array based on graphene and vanadium dioxide (VO₂) is presented in this paper. The uniform circular array (UCA) composed of circularly polarized (CP) antennas, which include a ring radiation patch, a parasitic patch, a perovskite substrate and an irregular VO₂ ground plane. The radiation patch is covered with a layer of graphene, by changing the chemical potential of graphene, the working bandwidth and axial ratio bandwidth of the antenna can be changed. By changing the phase state of VO₂ (metal state / insulation state) to control the working state of the antenna. The impedance bandwidth (IBW) of the CP antenna proposed is 115.09% (1.73–6.42 THz), the axial ratio bandwidth (ARBW) is 43.97% (2.36–3.69 THz). Using the CP antenna unit can simplify the complex feed network, and only feeding the equal amplitude and equal phase excitation can realize the vortex wave. Changing the number and rotation angle of the antenna unit can realize multimode vortex waves with the l= 0, ±1, ±2, ±3, the purity is approximately 1, respectively. The proposed UCA has excellent application prospect in the 6G communication.

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基于石墨烯和二氧化钒的可重构超宽带高纯度多模太赫兹 OAM 天线阵列

本文介绍了一种基于石墨烯和二氧化钒（VO2）的可重构超宽带多模太赫兹 OAM 天线阵列。均匀圆形阵列（UCA）由圆极化（CP）天线组成，其中包括一个环形辐射贴片、一个寄生贴片、一个过氧化物衬底和一个不规则的二氧化钒地平面。辐射贴片上覆盖了一层石墨烯，通过改变石墨烯的化学势，可以改变天线的工作带宽和轴向比带宽。通过改变 VO2 的相态（金属态/绝缘态）来控制天线的工作状态。所提出的 CP 天线的阻抗带宽（IBW）为 115.09%（1.73-6.42 太赫兹），轴比带宽（ARBW）为 43.97%（2.36-3.69 太赫兹）。使用 CP 天线单元可以简化复杂的馈电网络，只需馈入等幅等相激励即可实现涡旋波。改变天线单元的数量和旋转角度，可分别实现 l=0、±1、±2、±3 的多模涡旋波，纯度约为 1。所提出的 UCA 在 6G 通信中具有良好的应用前景。

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来源期刊

Aeu-International Journal of Electronics and Communications 工程技术-电信学

CiteScore

6.90

自引率

18.80%

发文量

292

审稿时长

4.9 months

期刊介绍： AEÜ is an international scientific journal which publishes both original works and invited tutorials. The journal''s scope covers all aspects of theory and design of circuits, systems and devices for electronics, signal processing, and communication, including: signal and system theory, digital signal processing network theory and circuit design information theory, communication theory and techniques, modulation, source and channel coding switching theory and techniques, communication protocols optical communications microwave theory and techniques, radar, sonar antennas, wave propagation AEÜ publishes full papers and letters with very short turn around time but a high standard review process. Review cycles are typically finished within twelve weeks by application of modern electronic communication facilities.