TECHNIQUES FOR WIRELESS POWER TRANSFER

The present disclosure relates to a wireless power transmitter device, the wireless power transmitter device comprising: at least one transmitter coil acting as inductive element of at least one inductive-capacitive resonator that upon excitation with a time-varying voltage produces a time varying electromagnetic field causing a circulating electric field through at least one receiver coil of a wireless power receiver device for charging the wireless power receiver device, wherein the at least one transmitter coil is composed of at least two spirals electrically connected to each other, wherein the at least two spirals are oriented in space to form a composed geometric figure. The disclosure further relates to a corresponding wireless power receiver device.