Abstract
Metamaterial have shown great power of controlling the EM waves, which is mainly about the propagation property of far field. In this paper, three-dimensional (3D) metamaterials are used in near field wireless power transfer (WPT) system for efficiency enhanced. The 3D metamaterial structure is composed of 4×4×1-array of five-turn spiral resonators. The WPT with bulk metamaterial is investigated theoretically, experimentally, and by simulation. To verify the enhancement of the WPT system by using 3D metamaterial, the four-coil systems integrated with and without bulk metamaterial are investigated by vector network analyzer (VNA). As a result, the maximum efficiency improvement of 20% is obtained with the 3D metamaterials at 1.5m transfer distance. At the same time, the range of efficient power transfer can be greatly extended.
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