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Wireless power transfer through a metal object is a major obstacle for the conventionally available tightly coupled inductive system. In this paper, we demonstrate that a metal encased mobile device is enabled for efficient wireless charging using a loosely coupled resonant system. To facilitate this approach, three coils are designed and distributed on a metal phone case and they are tuned for resonance...
This work aims for the design of printed spiral coils (PSC) with high quality factors. This consists in minimizing coil losses represented by proximity and eddy currents losses. For this purpose, specific geometric parameters characterizing spiral coils are shown to have a direct impact on increasing such losses. As a result, to minimize proximity effect, high ratios between the interspace separating...
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