Abstract
With the recent advancement and progress in the field of wireless power transfer (WPT), there is an ever increasing demand for high power transfer efficiency (PTE) of the WPT systems and improved transfer distance for the end-users. However, some existing WPT systems have limited PTE and transfer distance as they take the inductive coupling approach, where the PTE dramatically decreases as the distance between (Tx) and receiver (Rx) coils increases. Alternatively, magnetic resonance coupling (MRC) is used as a mid-range WPT approach, for which the insertion of metamaterials (MTMs) between Tx and Rx coils is exploited to improve efficiency. MTMs are artificially engineered materials that show uncommon electromagnetic properties, such as evanescent wave amplification and negative refractive characteristics, which could be utilized for the enhancement of PTE. In this article, a comprehensive review on recent progresses in the MTM-based WPT systems is reported, where previously reported MTM-based WPT systems are compared in terms of various parameters such as configurations, operating frequencies, dimensions and PTE. Also, the PTEs of these systems were plotted as a function of the normalized transfer distance. This review is expected to provide an insight for understanding the trends of the MTM-based WPT systems and serve as a reference for researchers who work on WPT systems and their applications.
Highlights
The research and development on wireless power transfer (WPT) has been actively carried out in various areas
The essential role of the magneto-inductive waves (MIW) in WPT systems is that the incident evanescent waves coming from the Tx coil strongly couple to the fields generated by MIW at the MTM interface and take energy from them, amplifying the evanescent waves [11], thereby enhancing the power transfer efficiency (PTE) of the WPT systems
This study has shown the MTM -based WPT system for consumer electronics and explored various experiments for practical applications
Summary
The research and development on wireless power transfer (WPT) has been actively carried out in various areas. MTMs are artificially engineered materials that show uncommon and exotic electromagnetic properties, such as evanescent wave amplification and negative refractive characteristics, and so on [4] These nontraditional phenomena provide innovative mechanisms for WPT and RF energy harvesting. It should be noted that still only a few reviews about MTMs in the WPT field have been reported [5]–[7] Even though they summarized the previous works, they did not provide a comprehensive overview in terms of the performances and relevant design parameters of the WPT systems which should be critical for understanding the trends in the WPT technologies.
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