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

Abstract

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.

Wearable Sensors for Respiration Monitoring: A Review

“…Thus, RFID-based respiration sensors are designed by correlating the RSSI variation to the mechanical deformation of the RFID antenna. This approach has been demonstrated in various studies for monitoring respiration rate and detecting breathing patterns [16,28,32,33], as discussed in the previous section.…”

Wearable UHF-RFID Sensor for Wetness Detection

“…Health monitoring [2], [3], goods [4] or patient tracking systems [5], and logistics [6], [7] are the areas where RFID technology is frequently used. The design and operating frequency of RFID sensors are determined according to the needs of their usage areas, and sensing functions [8]. Generally, there are three different frequency bands used for RFID tags.…”

“…Recently, Ultra High Frequency (UHF) RFID tags and sensors are highly preferred due to several advantages. Among these advantages are the low cost, long-distance operation, and fast-easy identification of UHF-RFID devices [8], [11].…”

“…Textile UHF RFID sensors have emerged as a result of the combination of sensing data wirelessly with flexible, and wearable substrates. The signal strength indicator parameter is a typical method used to detect data wirelessly [8], [12], [13].…”