Three-dimensional multidirectional inductance coil owning environmental conformal feature for wireless power transfer

For wireless power transfer (WPT) application with multi-load or multi-repeater, the system must need some inductance coil possessing the characteristic of transmitting power to multiple directions. This paper proposes a novel three-dimensional hexagon coil with simple structure, which is fabricated conveniently and easy to conformal with surrounding environment. The formula to calculate selfand mutual-inductances for the coil are given with the direction feature also introduced. Furthermore, numerical simulations and experimental results show mutual inductance is very stable in a wide scope of direction angle, to be applied in WPT with multidirectional transmission characteristics.