Abstract

The potential of wireless power transfer (WPT) has attracted considerable interest for various research and commercial applications for home and industry. Two important topics including transfer efficiency and electromotive force (EMF) leakage are concerned with modern WPT systems. This work presents the defected metasurface for localized WPT to prevent the transfer efficiency degraded by tuning the resonance of only one-unit cell at the certain metasurface (MTS). Localization cavities on the metasurface can be formed in a defected metasurface, thus fields can be confined to the region around a small receiver, which enhances the transfer efficiency and reduces leakage of electromagnetic fields. To create a cavity in MTS, a defected unit cell at the receiving coils’ positions for enhancing the efficiency will be designed, aiming to confine the magnetic field. Results show that the peak efficiency of 1.9% for the case of the free space is improved to 60% when the proposed defected metasurface is applied, which corresponds to 31.2 times enhancements. Therefore, the defected MTS can control the wave propagation in two-dimensional of WPT system.

Highlights

  • Leakage electromotive force (EMF) emitted from wireless power transfer (WPT) system should follow the feasible guideline of ICNIRP (International Commission on Non-Ionizing Radiation Protection (ICNIRP) [11]

  • Both transfer efficiency and EMF leakage are concerned in modern WPT

  • To compare the transfer efficiency (η) of all configurations, we use the magnitude of |S21|, which can be measured using a vector network analyzer (VNA) in experiments

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Summary

Introduction

Wireless technologies are important on our life societies. It is on emerging wireless communication systems e.g., 5G, WiFi6, and on wireless power transfer (WPT) systems. MTM/MTS have been proposed for enhancing the transfer efficiency and decreasing EMF leakage [20–25] To solve both efficiency and safety problems, the non-uniform [18] and hybrid MTM/MTS techniques [22] have been proposed, these are suitable for the size of transmitting and receiving coils are comparable. Another method is using magnetoinductive wave (MIW), which is supported by MTM/MTS composed of inductively coupled electrically small resonators and created by inter-element couplings [26–29]. In [30], the cavity is created by Fano-type interference, while the hybridization bandgap is used in [20] and MIW is applied in [25] Motivated by these observations, we modify the cavity mode concept to create a new defected metasurface (MTS) for enhancing transferred efficiency and reducing the electromotive force (EMF). A free space case, a conventional uniform MTS and the proposed defected MTS have been studied and compared

System configuration
Metasurface characteristics
Results and discussion
Conclusions
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