title: Wireless power delivery for wearable sensors and implants in Body Sensor Networks.
abstract: A recent study on witricity (wireless electricity) has demonstrated that wireless energy can be delivered over a moderate distance using strongly coupled magnetic resonance. The objective of this work is to apply the witricity technology to the problem of powering a wireless Body Sensor Network (wBSN). The theory of witricity is investigated using coupled mode theory. Compact witricity resonators are designed, and a working prototype of witricity powered wBSN is built and evaluated. An energy transfer efficiency of about 80 % over a distance of 15 cm is achieved. Besides the high efficiency, it has been observed that a certain misalignment between the transmitter and receiver has little effect on the power transfer. Our experimental results indicate that witricity provides a powerful solution to the energy supply problem of wBSN.
authors.affiliation: Laboratory for Computational Neuroscience, Departments of Neurosurgery and Electrical & Computer Engineering, University of Pittsburgh, PA 15260, USA.
authors.forename: Fei
authors.initials: F
authors.lastname: Zhang
authors.forename: Steve A
authors.initials: SA
authors.lastname: Hackwoth
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Liu
authors.forename: Chengliu
authors.initials: C
authors.lastname: Li
authors.forename: Mingui
authors.initials: M
authors.lastname: Sun
mesh_terms: D003020:Clothing; D003195:Computer Communication Networks / Q000295:instrumentation*; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D019736:Prostheses and Implants; D013686:Telemetry / Q000295:instrumentation*; D014159:Transducers