title: A study of multi-layer spiral inductors for remote powering of implantable sensors.
abstract: An approach based on multi-layer spiral inductors to remotely power implantable sensors is investigated. As compared to single-layer inductors having the same area, multi-layer printed inductors enable a higher efficiency (up to 35% higher) and voltage gain (almost one order of magnitude higher). A system conceived to be embedded into a skin patch is designed to verify the performance. The system is able to transmit up to 15 mW over a distance of 6 mm and up to 1.17 mW where a 17 mm beef sirloin is placed between the inductors. Furthermore, the system performs downlink communication (up to 100 kbps) and uplink communication based on the backscattering technique (up to 66.6 kbps). Long-range communication is achieved by means of a bluetooth module.
authors.affiliation: Integrated Circuits Laboratory, EPFL - École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland. jacopo.olivo@epfl.ch
authors.forename: Jacopo
authors.initials: J
authors.lastname: Olivo
authors.forename: Sandro
authors.initials: S
authors.lastname: Carrara
authors.forename: Giovanni
authors.initials: G
authors.lastname: De Micheli
mesh_terms: D000818:Animals; D002417:Cattle; D011211:Electric Power Supplies; D004867:Equipment Design; D006801:Humans; D008460:Meat; D019736:Prostheses and Implants; D013686:Telemetry / Q000295:instrumentation*