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Passive hybrid sensing tag with flexible substrate saw device

United States Patent

December 25, 2012
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
The integration of surface acoustic wave (SAW) filters, microfabricated transmission lines, and sensors onto polymer substrates in order to enable a passive wireless sensor platform is described herein. Incident microwave pulses on an integrated antenna are converted to an acoustic wave via a SAW filter and transmitted to an impedance based sensor, which for this work is a photodiode. Changes in the sensor state induce a corresponding change in the impedance of the sensor resulting in a reflectance profile. Data collected at a calibrated receiver is used to infer the state of the sensor. Based on this principal, light levels were passively and wirelessly demonstrated to be sensed at distances of up to about 12 feet.
Skinner; Jack L. (Brentwood, CA), Chu; Eric Y (Palo Alto, CA), Ho; Harvey (Pleasanton, CA)
Sandia Corporation (Albuquerque, NM)
12/ 777,355
May 11, 2010
STATEMENT OF GOVERNMENT INTEREST The United States Government has rights in this invention pursuant to Contract No. DE-AC04-94AL85000 between the United States Department of Energy and Sandia Corporation, for the operation of the Sandia National Laboratories.