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Passive Frequency Doubling Antenna Sensor for Wireless Strain Sensing

[+] Author Affiliations
Xiaohua Yi, Chunhee Cho, Yang Wang, Benjamin S. Cook, James Cooper, Rushi Vyas, Manos M. Tentzeris

Georgia Institute of Technology, Atlanta, GA

Roberto T. Leon

Virginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. SMASIS2012-7923, pp. 625-632; 8 pages
doi:10.1115/SMASIS2012-7923
From:
  • ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Structural Health Monitoring
  • Stone Mountain, Georgia, USA, September 19–21, 2012
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-4509-7
  • Copyright © 2012 by ASME

abstract

This paper presents the design, simulation, and preliminary measurement of a passive (battery-free) frequency doubling antenna sensor for strain sensing. Illuminated by a wireless reader, the sensor consists of three components, i.e. a receiving antenna with resonance frequency f0, a transmitting antenna with resonance frequency 2f0, and a matching network between the receiving and transmitting antennas. A Schottky diode is integrated in the matching network. Exploiting nonlinear circuit behavior of the diode, the matching network is able to generate output signal at doubled frequency of the reader interrogation signal. The output signal is then backscattered to the reader through the sensor-side transmitting antenna. Because the backscattered signal has a doubled frequency, it is easily distinguished by the reader from environmental reflections of original interrogation signal. When one of the sensor-side antennas, say receiving antenna, is bonded to a structure that experiences strain/deformation, resonance frequency of the antenna shifts accordingly. Through wireless interrogation, this resonance frequency shift can be measured by the reader and used to derive strain in the structure. Since operation power of the diode is harvested from the reader interrogation signal, no other power source is needed by the sensor. This means the frequency doubling antenna sensor is wireless and passive. Based on simulation results, strain sensitivity of this novel frequency doubling antenna sensor is around −3.84 kHz/με.

Copyright © 2012 by ASME
Topics: Sensors

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