Wireless power transfer using spiral coils-Investigation of coupling coefficient between spiral coils with different dimensions-

Abstract

These days, there have been increased interests in wireless power transfer technologies. We have been studying printed spiral coils for wireless power transfer to improve the coupling coefficient between them. In this paper, we report coupling coefficients between two models of coils similar to the spiral coils. As a result, the calculated inner radius of the similar spiral coil with the maximum coupling coefficient agreed with those obtained from the experiment and electromagnetic field analysis. Therefore, we can design the spiral coil dimensions with the maximum coupling coefficient for various separations between them.