JZUS - Journal of Zhejiang University SCIENCE

Frontiers of Information Technology & Electronic Engineering 2024 Vol.25 No.12 P.1732-1741

Simultaneous wireless information and power transmission system based on a dual-frequency metasurface design

Author(s): Yicen LI, Mingyang CHANG, Hao XUE, Haixia LIU, Long LI
Affiliation(s): School of Electronic Engineering, Xidian University,Xi'an 710071,China
Corresponding email(s): lilong@mail.xidian.edu.cn
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Abstract: Nowadays, the number of wireless sensor devices is increasing rapidly, posing persistent challenges related to battery replacement and power wiring. This paper presents a simultaneous wireless information and power transmission (SWIPT) scheme based on a frequency diversity metasurface design, which provides a wireless power supply scheme for electrical devices such as sensors. The metasurface is designed with frequency bands commonly found in the environment, and achieves efficient absorption of electromagnetic (EM) energy at 5.8 GHz and radiation of sensor information at 2.45 GHz, making it possible to take full advantage of the energy in the environment and easy to integrate with existing systems. The branches for the dual-square loop are designed based on spatial impedance matching and equivalent circuit, giving the metasurface advantages such as compact layout (unit size of 0.16λ₀×0.16λ₀×0.012λ₀, where λ₀ is the wavelength at 2.45 GHz), high isolation (S₂₁<-20 dB within the operating frequency band), and insensitivity to incident angles (efficiency over 80% within 60°). Integrated with rectification circuits and sensors, it efficiently converts EM waves received by the metasurface into direct current (DC) power for sensor operation. The sensors then radiate information through the metasurface, effectively addressing challenges related to sensor device wiring and battery replacement, thereby offering new solutions for the development of next-generation smart cities.

基于双频超表面设计的携能通信系统

李奕岑，常明扬，薛皓，刘海霞，李龙
西安电子科技大学电子工程学院，中国西安市，710071
摘要：现如今，无线传感器设备的数量正在迅速增加，这给重新更换电池和电源布线带来了长期的挑战。本文提出一种基于频率分集超表面设计的携能通信（SWIPT）方案，为传感器等电子设备提供了一种新的无线供电方案。超表面采用环境中常见的频段设计，可实现在5.8 GHz时高效接收电磁（EM）能量，在2.45 GHz时传输传感器信息，使其能够充分利用环境中的能量，并易于与现有系统集成。双方环的枝节是基于空间阻抗匹配和等效电路设计，具有体积小（单位尺寸为0.16λ₀×0.16λ₀×0.012λ₀，其中λ₀是2.45 GHz处的波长）、高隔离度（工作频带内S₂₁<−20 dB）和对入射角不敏感（在60°内保持80%以上的效率）等优点。超表面与整流电路和传感器集成，可有效地将超表面接收到的电磁波转换为直流电以供传感器工作。然后，传感器通过超表面辐射信息，有效解决与传感器设备布线和电池更换相关的挑战，从而为下一代智慧城市的发展提供新的解决方案。

关键词：频率分集；超表面设计；携能通信系统（SWIPT）；传感器

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