The popularity of wireless energy transfer has increased over the last few years and in particular for applications targeting portable device charging. In this article, EPC will focus on loosely coupled coils, highly-resonant wireless solutions suitable for the A4WP standard operating at either 6.78 MHz or 13.56 MHz unlicensed Industrial, Scientific and Medical (ISM) bands.

Bodo’s Power Systems
By Alex Lidow, Ph.D. and Michael De Rooij, Ph.D
May, 2014