Beamforming planar loop array for wireless power transfer

This paper presents magnetic beamforming using planar-type loop array for magnetic resonance wireless power transfer. The loop array is composed of a source loop and multiple repeater loops. Each loop is connected with capacitor in series. Magnetic beamforming is achieved by appropriate combination of the capacitor in each loop. Each loop of the array does not resonate but the loop array resonates because appropriate combination of capacitor meets impedance matching at the source. By controlling the capacitance of each loop, a desired shape of beamforming can be obtained.