Design and Implementation of Printed Spiral Coils used in Wireless Power Transmission Systems for Implantable Biomedical Devices


This paper proposed a small size and efficient square-shaped printed spiral coils (PSCs) at 13.56 MHz to be used for implantable biomedical devices. Detailed modeling of PSCs is presented. A design methodology has been applied to theoretical closed-form equations using MATLAB to optimize the wireless link of a 12×12 mm2 implantable coil example with 10 mm relative distance. All results are validated with the simulation using an electromagnetic field solver HFSS 14.1. Also, the PSCs has been implemented for verification using FR4 printed circuit board. The results show that optimized coil pairs achieved efficiency up to 80% at face to face relative distance of 10 mm in the air.