Near-field antenna for wireless power transmission with 4 coplanar antenna elements

摘要

A near field antenna is provided comprising a reflector and four individual coplanar antenna elements offset from the reflector. Each of the four individual coplanar antenna elements follows a respective meandering pattern. Two of the four coplanar antenna elements form a first dipole antenna along a first axis, and the other two antenna elements of the four coplanar antenna elements form a second dipole along a second axis perpendicular to the first axis. Form an antenna. The near-field antenna includes (i) a power amplifier configured to feed electromagnetic signals to one of the dipole antennas, (ii) an impedance-adjusting component configured to adjust the impedance of one of the dipole antennas, and (iii) a power amplifier, It further comprises an impedance-adjusting component and a switch circuit coupled to the dipole antennas. The switch circuit is configured to switchably couple the first dipole antenna to the power amplifier and switchably couple the second dipole antenna to the impedance-adjusting component, or vice versa.