Design and Optimization of Printed Spiral Coils used in Wireless Power Transmission Systems for Powering 10 mm2 Receiver Size at 13.56 MHz Operating Frequency

Abstract

Due to size limitations and limited battery life, many implant biomedical devices need to be powered inductively. This paper introduces a small size and efficient spiral square coils at 13.56 MHz to be used for bio-implantable devices. We applied our design methodology with theoretical closed-form equations using MATLAB to optimize the wireless link of a 10 mm2 implantable device example with 10 mm relative distance. The results showed that optimized coil pairs achieved 73.46% efficiency at face to face relative distance of 10 mm in the air. All results are validated with the simulation using an electromagnetic field solver HFSS 14.1.