wireless power transfer based on metamaterials · near-field based wireless power transfer (wpt)...

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Wireless Power Transfer based on Metamaterials

Wang, B.; Yerazunis, W.S.; Teo, K.H.

TR2016-166 November 2016

AbstractNear-field based wireless power transfer (WPT) technology is promising for many applicationsfrom consumer electronics to industrial automation. By utilizing resonant coupling, the powertransfer can be made more flexible than conventional inductive WPT. However, the range isstill limited. In this chapter, we report research work on near-field wireless power transfer(WPT) based on metamaterials related ideas, aiming to extend the range and improve theflexibility of a WPT system.

In the first part, we show that with a thin slab of metamaterial, the near-field couplingbetween two resonant coils can be enhanced; the power transfer efficiency between coils canalso be greatly improved by the metamaterial. The principle of enhanced coupling withmetamaterials will be discussed; the design process of metamaterial slabs for WPT will beintroduced; experimental results on WPT efficiency improvement with metamaterials willalso be presented.

In the second part, inspired by metamaterials theory, we study the mutual coupling ofan array of coupled resonators, and their application for WPT. We show that the range ofWPT can be greatly extended with an array of coupled resonators. More importantly, thetechnology enables wireless power delivery to both static and mobile devices. The principleof this technology will be explained; analytical and numerical models will be introduced toestimate the performance of a WPT system based on an array of coupled resonators; methodsfor WPT optimization will be discussed and experimental results will be presented.

Wireless Power Transfer Algorithms, Technologies and Applications in Ad Hoc Commu-nication Networks

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