Flexible & Planar Implantable Resonant Coils for Wireless Power Transfer using Inkjet Masking Technique

In this paper, we present the design, fabrication and characterization of implantable coils, operating at 13.56 MHz ISM band for biomedical applications. Rogers RO 4003C substrate was used for the prototype of the implantable coil while Rogers RO 3850 flexible substrate was used for the external transmitter coil. The Inkjet masking technique was used for the patterning the planar coil on the flexible substrate. Wireless power transfer efficiency measurements were conducted in free space and water environments, varying the operating distance between the prototype coils from 5mm to 20mm, featuring transfer efficiencies upto 55% and 35%, respectively.