Remote Interrogation and Powering of a Spin Torque Nano-oscillator for Standoff Sensing

Report No. ARL-TR-5829
Authors: Jesse Campbell, Theodore Anthony, Chris Fazi, and Alma E. Wickenden
Date/Pages: November 2011; 18 pages
Abstract: Passively powered devices are becoming more essential when designing centimeter-scale communication capable devices. Power components are often the majority of the weight in small robots, so eliminating the onboard power source will give engineers and scientists the ability to scale down devices. An X-band wafer level antenna on a 16- by 16-mm wafer that will harvest power from a base station with the intent of providing drive current to a low-power device such as a spin torque nano-oscillator (STNO) has been designed. A circuit that will rectify the propagating radio frequency (RF) waves and provide the STNO with a constant DC drive current was also designed. The STNO output radiation consists of an amplitude- and frequency-modulated signal that allows data to be transmitted from the STNO. Remotely powering the STNO will enable it to transmit data on the condition of a battlefield sensor back to the base station. This research was performed in the summer of 2009 as part of the Science Outreach for Army Research (SOAR) program.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2011