A Resonant Capacitive Wireless Power and Data Transfer Link with 52% PTE and 6.5 Mbps Data Rate for Biomedical Implants

Abstract

This paper presents a highly-efficient and high-speed capacitive wireless power and data transfer (C-WPDT) link for biomedical implants. Series-resonant capacitive wireless power and data transfer scheme involving external tuning inductors has been used for power transfer to biomedical implants. The same link has also been utilized for high-speed data transmission using simple amplitude-modulated signals. Ex vivo measurements are performed using beef muscle for a characteristic example. The series-resonant links show up to 52% power transfer efficiency (PTE) in a test case, which is comparable with the state-of-the-art power transfer schemes for implantable bioelectronics. The same link features a maximum of 6.5 Mbps data rate, which is the highest among tuned capacitive links with two pairs of metallic patches.