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Passive hybrid sensing tag with flexible substrate saw device

Patent ·
OSTI ID:1082130
; ;

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.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC04-94AL85000
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Number(s):
8,339,219
Application Number:
12/777,355
OSTI ID:
1082130
Country of Publication:
United States
Language:
English

References (9)

Smart dust mote forerunners
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Wirelessly interrogable SAW-sensors for vehicular applications
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conference January 1996
Radio accessible SAW sensors for non-contact measurement of torque and temperature conference January 1996

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