Electro-Textile UHF-RFID Compression Sensor for Health-Caring Applications

Electro-textile Ultra High Frequency (UHF, 865-868 MHz) Radio Frequency Identification (RFID) devices have great potential to be explored as sensors due to the features of fabric materials.In this work, an electro-textile UHF-RFID compression sensor base on T-match structure with a corresponding interface are developed and evaluated for two application scenarios.For accurate textile UHF-RFID antenna design and maximize the read range, the impedance of the electro-textile based on snap buttons is modelled and characterized an a measured read range of 5.22m is experimentally obtained.If the distance of the RFID reader and RFID sensor remain constant at 1 m.The experimental results show that RSSI range change from -42 dBm to -58 dBm as a quadratic function in terms of the knee angle bending and from -45 dBm to -40 dBm during expiration and inspiration phase when the sensor is located on the chest, which validated the usefulness of the proposed sensor.