title: An RF powering system with adaptive impedance matching for individual health monitoring applications.
abstract: This paper presents a high-efficiency RF powering system, suitable for individual health monitoring applications. The system is composed of an antenna, an impedance matching network, and a two-stage full-wave RF-DC rectifier. A novel tuning mechanism is proposed to automatically adjust the impedance of the matching network. This mechanism can effectively improve the power efficiency of the system by 47% compared to the case without tuning. For the adaptive impedance, only a 5-bits binary weighted capacitor bank is required in the matching network. The complete system, designed in a standard 0.13μm CMOS technology, converts a -6dBm 915MHz RF signal to a 1.7V DC voltage with an output current of 85μA. The simulated maximum power efficiency of the complete RF harvester is 66%.
authors.lastname: Zemin Liu
authors.lastname: Yu-Pin Hsu
authors.forename: Mona M
authors.initials: MM
authors.lastname: Hella
mesh_terms: D017097:Electric Impedance; D011211:Electric Power Supplies; D004867:Equipment Design; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D011846:Radio Waves