WIRELESS POWER TRANSFER THIN PROFILE COIL ASSEMBLY

A resonant induction wireless power transfer coil comprising:a 2n-layer coil stack, where n is a positive integer, each layer of the coil stack comprising:a dielectric (400) having a first side and a second side,a first conductor pattern comprising a first plurality of conductors (401) wound in a spiral on the first side of the dielectric, anda second conductor pattern comprising a second plurality of conductors (402) wound in a spiral on the second side of the dielectric, the second conductor pattern being aligned with the first conductor pattern whereby the second conductor pattern reinforces magnetic flux generated by the first conductor pattern,wherein the first and second conductor patterns are placed relative to one another so as to provide flux transmission in a same direction; anda capacitance between each layer of the coil stack selected such that the 2n-layer coil stack is self-resonating at a self-resonating frequency fr = 1/2π(LC)1/2, where L= equivalent coil inductance of the 2n-layer coil stack and C = equivalent capacitance of the 2n-layer coil stack.