Abstract
Middle range MPT (microwave power transmission) is very important and hot issue, which uses RF (radio frequency) beamforming technology. To efficiently provide the power at distance, large dimension of array system is basically required in to the far end power receiver. In this paper, we design an antenna and phase conjugate circuit for the Retrodirective Array Antenna (RDA) - based microwave Power Transfer (MPT) system. Microwave power transfer is a technology that can effectively power various internet of things (IoT) devices that will explode in the future. Microwave power transmission is achieved through various methods, it is important to improve the power transmission distance and efficiency. In particular, long-range microwave power transmission system using microwave is less efficient than other transmission methods. Therefore, in designing the power transmitter and receiver, the link budget should be analyzed and the system should be designed based on this to maximize the power transmission efficiency. In this paper, we propose a multi-antenna design method of power transmitter and receiver via link budget analysis. Through the simulation and measurement results, it is confirmed that the antenna gain required in the system can be achieved through the multi-antenna configuration, and the optimal transmission power value should be calculated in consideration of the RF-DC rectifier efficiency. Based on this, it is possible to design a microwave power transmission system having acceptable power transmission efficiency.
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