TRANSMITTER APPARATUS AND TRANSMISSION METHOD FOR A WIRELESS POWER TRANSMISSION SYSTEM PROVIDING IMPROVED WIRELESS POWER TRANSMISSION EFFICIENCY

A wireless power transmission system includes a receiver position identifier unit configured to determine the positions of receiver apparatuses; a signal transmitter unit comprising antennas arrayed in a pre-designated pattern and configured to radiate wireless power signals by forming a beam in a pattern corresponding to signals supplied respectively to the antennas; and a beamforming unit configured to improve a wireless power transmission efficiency by temporarily setting a frequency vector, which is for designating frequencies of the signals supplied to the antennas, and a beamforming vector, which is for designating phases and gains of the signals, based on the positions of the receiver apparatuses and alternatingly iteratively estimating the other vector to enhance power transmission efficiency such that a multi-lobe beam pattern radiated simultaneously in the directions of the receiver apparatuses is formed in the antennas.