Narrowband Full-Duplex Communication Method in Simultaneous Wireless Power and Data Transfer for Implantable Device

This paper presents a novel design methodology for narrowband full-duplex simultaneous wireless power and data transmission(SWPDT) systems, targeting enhanced power and communication performance in compact applications for implantable devices. The proposed approach incorporates the flexibility of frequency division multiplexing (FDM) with an optimized parallel impedance network to achieve complete decouple design for power and data transfer. By setting communication frequency as an integer multiple of the power transmission frequency, interference from the low-order power harmonic is effectively mitigates. A parallel impedance network is then constructed based on symmetrical port network analysis to suppress adjacent channel interference(ACI) and improve the signal-to-noise ratio(SNR) through the dedicated adjusting impedance. A protype based on Class E topology achieves 289 mW power transmission with 74.8% efficiency, along with fullduplex communication at 1 Mbps. Simulation and experimental results validate the effectiveness of the proposed method, demonstrating its potential as a high-performance solution with enhanced efficiency, bidirectional communication capability and design flexibility for implantable devices in real life.