US Patent 10361591 Inductive power transfer coils with parasitic resonators

Techniques for wireless power charging of chargeable devices such as electric vehicles are provided. An example of a wireless power transmitting apparatus according to the disclosure includes a first coil structure, at least one second coil structure disposed adjacent to the first coil structure, and a transmitter operably and electrically connected to the first coil structure, such that the transmitter is configured to provide an electrical signal to the first coil structure and such that the at least one second coil structure is a parasitic coil structure and such that at least one of the first and the at least one second coil structure is a double-D coil structure.