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We studied a low-cost chipless radio-frequency identification strain sensor tag operating at 2.45 GHz. The sensor is based on a 18.5 × 18.5 mm2 single split ring resonator which is fully inkjet printed on a flexible substrate. For an applied strain of 20 %, a silver-based ink strip printed on a polyimide substrate showed an irreversible conductivity variation up to 700 %. Correspondingly, when illuminated...
A wireless chipless sensor for structural deformation monitoring is proposed. The sensor is based on two resonant scatterers sewn on stretchable fabrics with conductive threads. The combination of the two scatterers allows for the detection of the strain in a 2-D plane. The backscattered response, as a function of frequency, is detected with the help of frequency-stepped continuous wave radar technique...
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