An Improvement of SNR for Simultaneous Wireless Power and Data Transfer System with Full-duplex Mode Based on Dual-tuned Filter

This paper proposed a wireless power and data transmission system based on dual-tuned filter. By using a dual-tuned filter to form the receiving end of data on both sides, interference from the same side data source can be greatly reduced. Considering the impact of power channel on data channel, a notch network was added to the power channel. By analyzing the transfer function of each part in the data transmission channel, an expression for SNR is derived. Based on this, a method is proposed to improve the parameters of the data transmission channel to enhance the SNR. Furthermore, the interference between power and data transmission channels was analyzed, and methods for suppressing crosstalk were provided. With the well-designed parameters, 100W power with a forward data transmission rate of 200kbps and a backward data transmission rate of 170kbps full-duplex communication is obtained, and the effectiveness of the proposed method is validated.