Designing and Evaluating Circular and Square Coils for Tissue Monitoring using RF Wireless Power Transmission

Tissue engineering, a burgeoning multidisciplinary field, seeks to repair or replace damaged tissues and organs by leveraging engineering and biological principles. Central to the advancement of this field is the ability to monitor tissue growth in real-time. This necessitates the use of implantable devices, such as sensors, which need to be powered. Traditional power sources, like batteries, could impede tissue growth and tissue damage, making Wireless Power Transfer (WPT) an attractive alternative. This study delves into detail the design and evaluation of coil configurations for RF wireless power transmission applied to tissue monitoring. Specifically, the contrast of the performance metrics between two coil designs: one featuring four circular coils and another blending three square coils with one circular coil. The analyses revealed that while both configurations experience diminished performance as the distance between transmitter and receiver increases, the efficiency for four circular coils at a distance of 30 mm is 25%, and for three square coils and one circular coil is 45%, and their efficiencies vary distinctly. Circular coils showcased higher power transfer efficiency and biocompatibility, whereas a combination of square and circular coils extended the transmission distance. Our findings illuminate the interplay between coil design and WPT performance, offering invaluable insights for developing implantable devices tailored for real-time tissue growth monitoring. This study propels the design endeavors in WPT and positions itself as a pivotal reference for applications in wound healing, organ transplantation, and drug testing.