| The wireless power transmission (WPT) systems consisting of two microstrip patch antenna arrays are investigated. Through maximizing the power transmission efficiency between the two arrays,the optimized phases and amplitudes of the excitations for both the transmitting and the receiving antenna elements can be obtained and then realized by feeding networks. Based on the method proposed in this paper,three wireless power transmission systems composed of microstrip antenna arrays are successfully designed. The main research includes:1?One WPT system uses two identical 4x4 arrays at 5.8GHz for the transmitting and the receiving, and the two arrays are separated by a distance of 30 cm. The simulation results are in good agreement with the measured results, whichverifies the feasibility and accuracy of the optimization method.2?The second WPT system uses a 6×6 array as the transmitting and a 4×4 array as the receiving, and the measured transmission efficiency reaches 42% when the two arrays are separated by a distance of 40 cm. Compared with what has been reported recently in[1], our design reduces the number of transmitting array elements by half and uses smaller receiving array, and has increased transmission efficiency by 25.7%, which further validates the feasibility and superiority of the optimization method.3?Our last WPT system uses two identical 8×8 arrays as the transmitting and the receiving, and the simulated and measured power transmission efficiency reaches 46.9% when the two arrays are separated by a distance of 1m, which shows using the optimization method through maximizing the power transmission efficiency between the two arrays can significantly improve the power transmission efficiency of the system. |
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