Phase synthesis of antennas

A review of works devoted to the problem of energy transfer by a beam of radio waves is presented. Methods and algorithms for finding optimum phase and amplitude distributions in radiating wireless power transmission systems are developed. Numerical methods of the phase synthesis of antennas for a field in the Fresnel area are elaborated. The example of the synthesis field is shown. The uniform-amplitude antenna system of 10 sub apertures was taken. The initial phase distribution was zero. The distribution of the radiated field in the Fresnel area is investigated. It was required to suppress the level of radiation in the zone of the second side lobe to keep the maximum possible value of power transmitting efficiency. In accordance with the described algorithm, after three iterations, the level of the second side lobe has decreased by more than 20 dB while the power transmission efficiency has fallen by less than 2%.