Experimental results with two wireless power transfer systems

Authors:
Alanson Sample;Joshua R. Smith
Affiliations:
Intel Research Seattle, Seattle, WA and Department of Electrical Engineering, University of Washington, Seattle, WA;Intel Research Seattle, Seattle, WA
Venue:
RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
Year:
2009

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Abstract

This paper describes two wireless power transfer systems. The Wireless Identification and Sensing Platform (WISP) is a platform for sensing and computation that is powered and read by a commercial off-the-shelf UHF (915MHz) RFID reader. WISPs are small sensor devices that consume on the order of 2uW to 2mW, and can be operated at distances of up to several meters from the reader. The second system harvests VHF or UHF energy from TV towers, with power available depending on range and broadcast transmit power. We report on an experiment in which 60uW is harvested at a range of about 4km.