Abstract
This paper explores folded patch antennas for the development of low-cost and wireless smart-skin sensors that monitor the strain in metallic structures. When the patch antenna is under strain/deformation, its resonance frequency varies accordingly. The variation can be easily interrogated and recorded by a wireless reader that also provides power for the antenna operation. The patch antenna adopts a specially selected substrate material with low dielectric constant, as well as an inexpensive off-the-shelf radiofrequency identification (RFID) chip for signal modulation. A thicker substrate increases RFID signal-to-noise ratio, but reduces the strain transfer efficiency. To experimentally study the effect of substrate thickness, two prototype folded patch antennas with different substrate thicknesses have been designed and manufactured. For both prototypes, tensile testing results show strong linearity between the interrogated resonance frequency and the strain experienced by the antenna. Longer interrogation range is achieved with the larger substrate thickness.
Original language | English |
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Title of host publication | Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011 |
Volume | 7981 |
DOIs | |
Publication status | Published - 2011 |
Publication type | A4 Article in conference proceedings |
Event | Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011 - San Diego, CA, United States Duration: 7 Mar 2011 → 10 Mar 2011 |
Conference
Conference | Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011 |
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Country/Territory | United States |
City | San Diego, CA |
Period | 7/03/11 → 10/03/11 |
Keywords
- folded patch antenna
- passive wireless sensor
- RFID
- strain sensor
- substrate thickness
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics