Microfabricated Electrodynamic Wireless Power Receiver for Bio-Implants and Wearables

Abstract

This paper reports the design, modeling, fabrication, and characterization of a microfabricated receiver as part of an electrodynamic wireless power transmission (EWPT) system. This system differs from inductively coupled wireless power transmission (WPT) by employing low-frequency (<1 kHz) magnetic fields to deliver power over 10's of cm to multiple compact receivers in a cluttered environment. Herein we report the first-ever, chip-scale microfabricated EWPT receiver, which can output 2.5 mW of power under a 744 Hz, 550 μTpk ac magnetic field (equivalent to 20 cm transmission distance). Compared to a previously reported prototype, the microfabricated device is 14.5x smaller (0.55 cm 3 vs. 8 cm 3 ), and offers a 2.1x increase in power density (4.6 mW/cm 3 vs. 2.2 mW/cm 3 ).