MINIATURIZED HIGHLY-EFFICIENT DESIGNS FOR NEAR-FIELD POWER TRANSFER SYSTEM

摘要

Disclosed herein are embodiments of near-field power transfer systems that include antenna elements that are constructed or printed close to each other in a meandered arrangement. In a meandered arrangement, neighboring antenna elements conduct currents that flow in opposite directions. This current flow entirely or almost entirely cancels out any far field RF radiation generated by the antennas or otherwise generated by the electromagnetic effects of the current flow. In other words, for a first current flowing in a first path, there may be a second current flowing in a second cancellation path, which cancels the far field radiation produced by the first current flowing in the first path. Therefore, there may be no radiation of power to the far field. Such cancellation, however, may not occur in a near-field active zone, where the transfer of power may occur between the transmitter and the receiver. Furthermore, a ground plane may block the leakage of power from the back of a transmitter and/or a receiver.