Wireless Power Transfer (WPT) technology has attracted a great number of attention due to its convenience, reliability, and safety. This promising technology has broad application prospects, such as consumer electronics, biomedical implants, and electric vehicles (EVs). However, although the WPT technology has numerous advantages, the transfer efficiency in WPT systems decreases rapidly as the distance increases, and large electromagnetic field (EMF) noise is inevitably generated in WPT charging systems and potentially harmful to electronic components, even to human health. The interesting breakthrough in electromagnetic metamaterials has opened up a creative and innovative paradigm for refocusing propagating waves and amplifying evanescent waves as a ‘perfect lens’. The abilities of metamaterials can be fully applied to the WPT system for efficiency enhancement. Later advances in this cross-domain further show that the metamaterials with different fabrications can shield the EMF around the WPT system as well. The application of the metamaterial in WPT systems has received a great deal of attention in improving the transfer efficiency and reducing the leakage of EMF in recent years.

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