当前位置: X-MOL 学术IEEE Internet Things J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Multifocus Techniques for Reconfigurable Intelligent Surface-Aided Wireless Power Transfer: Theory to Experiment
IEEE Internet of Things Journal ( IF 10.6 ) Pub Date : 2022-08-02 , DOI: 10.1109/jiot.2022.3195948
Nguyen Minh Tran 1 , Muhammad Miftahul Amri 1 , Je Hyeon Park 1 , Dong In Kim 1 , Kae Won Choi 1
Affiliation  

Recently, reconfigurable intelligent surface (RIS) with passive beamforming capability is emerging as a potential technology for wireless power transfer (WPT) applications thanks to its cost-effective and energy-efficient features. This work studies multifocus techniques for RIS-aided WPT systems to simultaneously and adaptively charge multiple Internet of Things (IoT) devices in the Fresnel zone. In particular, we propose three multifocus methods, which are pattern addition (PA), random unit cell interleaving (RUI), and RIS tile division (RTD), for enabling multifocus RIS-aided WPT applications. We elaborate the algorithms for computing the RIS reflection phases for all methods. The proposed methods can balance the power levels of beams focused on multiple receivers by controlling weight factors. Furthermore, we have implemented a real-life RIS-aided WPT testbed to verify these proposed methods. The system consists of a phased antenna array transmitter, two receivers, and a 1-bit RIS with 512 unit cells. The WPT experiments have been performed in several test scenarios to show the effectiveness of the proposed techniques. The experiment results demonstrate that the proposed schemes effectively generate multiple focusing beams with adjustable power levels toward the desired receivers.

中文翻译:

可重构智能表面辅助无线电力传输的多焦点技术:从理论到实验

最近,具有无源波束成形能力的可重构智能表面 (RIS) 因其具有成本效益和节能特性而成为无线电力传输 (WPT) 应用的潜在技术。这项工作研究了 RIS 辅助 WPT 系统的多焦点技术,以同时和自适应地为菲涅耳区的多个物联网 (IoT) 设备充电。特别是,我们提出了三种多焦点方法,即图案添加 (PA)、随机单位单元交织 (RUI) 和 RIS 瓦片分割 (RTD),以实现多焦点 RIS 辅助 WPT 应用。我们详细阐述了计算所有方法的 RIS 反射相位的算法。所提出的方法可以通过控制权重因子来平衡聚焦在多个接收器上的波束的功率水平。此外,我们已经实现了一个真实的 RIS 辅助 WPT 测试平台来验证这些提议的方法。该系统由一个相控天线阵列发射器、两个接收器和一个具有 512 个单元的 1 位 RIS 组成。WPT 实验已经在几个测试场景中进行,以显示所提出技术的有效性。实验结果表明,所提出的方案有效地生成多个聚焦光束,其功率水平可调节,朝向所需的接收器。
更新日期:2022-08-02
down
wechat
bug