期刊
IEEE INTERNET OF THINGS JOURNAL
卷 9, 期 18, 页码 17157-17171出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2022.3195948
关键词
Energy harvesting; reconfigurable intelligent surface (RIS); wireless power transfer (WPT)
资金
- National Research Foundation of Korea (NRF) - Korea Government (MSIT) [NRF-2022R1A4A1033830]
- Ministry of Science and ICT (MSIT), South Korea [IITP-2022-2020-0-01821]
- Ministry of Science and ICT (MSIT), South Korea, through the Information Technology Research Center (ITRC) Support Program [IITP-2021-0-02046]
- NRF - Korean Government (MSIT) [2021R1A2C2007638]
This paper investigates the application of multifocus techniques in RIS-assisted WPT systems, proposes three methods to achieve multifocus charging for multiple IoT devices, and validates the effectiveness of these methods through experiments.
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.
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