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An omnidirectional wireless power transmission system with controllable magnetic field distribution

A design method for the omnidirectional wireless power transmission system (OWPT) is proposed. The OWPT is realized by applying the rotating magnetic field, which is generated by the proposed transmitter. The proposed transmitter is composed by two mutually perpendicular loops fed by two excitation sources with the same magnitude but different phases. An OWPT system prototype is fabricated and measured. The experimental results validate the property of omnidirectional wireless power transmission. Furthermore, the magnetic field distribution can be steered by the feeding phase difference between the two loops. This capability enable the proposed OWPT system to focus energy for receiver moving in a limited range of receiving angle.