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Wireless strain and crack sensing using a folded patch antenna

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationProceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012
Number of pages4
Publication statusPublished - 2012
Publication typeA4 Article in a conference publication
Event6th European Conference on Antennas and Propagation, EuCAP 2012 - Prague, Czech Republic
Duration: 26 Mar 201230 Mar 2012


Conference6th European Conference on Antennas and Propagation, EuCAP 2012
CountryCzech Republic


In this research, folded patch antennas are investigated as low-cost and wireless smart-skin sensors that monitor the strain and crack in metallic structures. A radio frequency identification (RFID) chip is used for signal modulation. When the antenna is under strain/deformation, its resonance frequency varies accordingly. The variation can be easily interrogated and recorded by a reader that wirelessly delivers power for the antenna operation. Therefore, the antenna sensor can measure strain/crack. This paper reports latest test results on the strain and crack sensing performance of the antenna. In particular, tensile tests show that the wireless antenna sensor can detect small strain changes lower than 20 , and can perform well at large strains higher than 10,000 . In the crack test, a growing sub-millimeter crack is successfully detected by the antenna sensor.

ASJC Scopus subject areas


  • antenna sensor, crack sensing, Folded patch antenna, RFID, wireless strain sensing