Compressive strain measurement using RFID patch antenna sensors

Chunhee Cho; Xiaohua Yi; Yang Wang; Manos M. Tentzeris; Roberto T. Leon

doi:10.1117/12.2045122

10 April 2014 Compressive strain measurement using RFID patch antenna sensors

Chunhee Cho, Xiaohua Yi, Yang Wang, Manos M. Tentzeris, Roberto T. Leon

Proceedings Volume 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014; 90610X (2014) https://doi.org/10.1117/12.2045122
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

In this research, two radiofrequency identification (RFID) antenna sensor designs are tested for compressive strain measurement. The first design is a passive (battery-free) folded patch antenna sensor with a planar dimension of 61mm × 69mm. The second design is a slotted patch antenna sensor, whose dimension is reduced to 48mm × 44mm by introducing slots on antenna conducting layer to detour surface current path. A three-point bending setup is fabricated to apply compression on a tapered aluminum specimen mounted with an antenna sensor. Mechanics-electromagnetics coupled simulation shows that the antenna resonance frequency shifts when each antenna sensor is under compressive strain. Extensive compression tests are conducted to verify the strain sensing performance of the two sensors. Experimental results confirm that the resonance frequency of each antenna sensor increases in an approximately linear relationship with respect to compressive strain. The compressive strain sensing performance of the two RFID antenna sensors, including strain sensitivity and determination coefficient, is evaluated based on the experimental data.

Citation Download Citation

Chunhee Cho, Xiaohua Yi, Yang Wang, Manos M. Tentzeris, and Roberto T. Leon "Compressive strain measurement using RFID patch antenna sensors", Proc. SPIE 9061, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014, 90610X (10 April 2014); https://doi.org/10.1117/12.2045122

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