In recent years, wireless power transfer system has evolved tremendously as a mean to deliver power to miniaturized implantable sensors. Efficiently delivering power to implants is a challenge due to the loose coupling between the transmitter and receiver coils because of the various misalignments. In the first part of the presentation, a wirelessly powered brain neuromodulation implant will be presented which includes the miniaturized transmitter and receiver coils, energy harvesting circuit design on-chip and closed-loop system for power regulation. The challenges associated with neural signal recording and wireless data telemetry will also be discussed. In the second part, the focus will be on wearable sensors and the feasibility study of different energy harvesting schemes for these sensors. The idea of a novel liquid-based energy harvesting called reverse electrowetting will be introduced to harvest energy from low-frequency movement and to develop a self-powered motion sensor to detect various movements such as walking and running. Finally, the presentation will conclude highlighting dry electrodes and antenna designs on flexible polymer substrates for a wearable ECG application.
Ifana Mahbub is an Assistant Professor in the Department of Electrical Engineering at the University of North Texas, where she is leading the Integrated Biomedical Circuits and Systems Laboratory (iBioCASL). Her research interests include energy-efficient circuits and systems design for wireless telemetry, energy harvesting and signal processing applications for implantable and wearable sensors. Her works also focus on the RF and microwave component designs and miniaturized, flexible antenna design. She received the B.Sc. degree (2012) in Electrical and Electronic Engineering from Bangladesh University of Engineering and Technology, Bangladesh and the Ph.D. degree (2017) in Electrical Engineering and Computer Science from the University of Tennessee, Knoxville. In recognition of her outstanding research and teaching achievements, Dr. Mahbub received the University of Tennessee Chancellor’s fellowship in 2014, Chancellor’s Citation award for “Extraordinary Professional Promise” in 2014 - 2017, and a Graduate Teaching Assistant Award in 2014. She also worked as an RF design engineering intern at Qorvo, Inc. during the summer of 2015 and 2016 respectively. Dr. Mahbub has published 2 book chapters, 15 journal publications, and 29 peer-reviewed conference publications. She currently serves as the Vice-chair of the IEEE Circuits & Systems Society, Dallas Chapter. She is a guest editor for the MDPI Journal of Low-Power Electronics and Applications, publications chair for the 2018 and 2019 IEEE MTT Texas Symposium on Wireless & Microwave Circuits & Systems conference and SPC chair for the 2018 IEEE MTT-S International Microwave Biomedical Conference.