Miniaturized wireless power transfer systems using 3-D strongly coupled magnetic resonance

In this paper, a novel method using 3-D Strongly Coupled Magnetic Resonance (SCMR) is proposed in order to miniaturize Wireless Power Transfer (WPT) systems. This method successfully tuned the operating frequency to lower frequencies with excellent efficiencies, thereby reducing the size of SCMR systems. Also, 3-D SCMR systems based on two and three layered spiral resonators in opposite directions shift the working frequency to lower frequency efficiently, from 210 MHz to 162 MHz and 127 MHz, respectively.