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We investigate the strain reliability of passive UHF RFID tags based on antennas printed on two structurally dissimilar textiles. The performance of the tags under strain and during repeated stretching cycles is evaluated through wireless measurements. Initially, both tags achieve read ranges of 9.5 meters and retain high readable ranges under notable, 20%, strain. Our results from a cyclic strain...
Highly stretchable e-textile antennas enable wireless strain sensing based on passive UHF RFID tags. We present two sensors both based on a two-tag system, where one tag antenna is sensitive and one is insensitive toward strain. This way, we achieve novel referenced strain sensors for unambiguous readout. We outline the antenna system development to achieve high EM isolation between the tags and present...
We characterize a passive UHF RFID tag based on a stretchable dipole antenna which is screen printed on ultra-thin polyurethane substrate with silver ink. Our results show that the change in the conductor properties due to strain is large enough to modify the electromagnetic properties of the antenna notably, yet small enough so that the tag retains high performance even under 20-% strain. By comparing...
Sensing capabilities embedded in a passive UHF RFID tag provide a battery-free wireless sensor equipped with a digital identifier. We present an RFID strain sensor tag based on a stretchable antenna made of conductive fabrics. To create an efficient antenna for the sensor tag, we use non-stretchable and highly conductive copper-coated fabric to form the main antenna body and join a section of stretchable...
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...
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