Miniature Coil Design for Through Metal Wireless Power Transfer

In this paper, we present the design and development of ultra-small coils for through metal power transfer applications. Our coil has a total size of 15x15x2 mm. We determined the optimal wire gauge for the coil to be 24AWG and optimal frequency of 2 kHz. Our experimental results demonstrate that we can harvest 100 mW power through 1 mm thick aluminum using our proposed coils. To the best of our knowledge, this is the first report of ultra-small coils for through metal power transfer.