RFID tag antenna for passive strain sensing

The processing of backscattered signals coming from RFID tags has been demonstrated to be potentially useful to detect the physical state of the target object. It is here shown how to design a completely passive UHF RFID sensor for strain monitoring starting from a meander-line dipole whose shape factor and feed section are engineered to achieve the desired sensing resolution and range. This class of devices are potentially low-cost and may found interesting applications in the Structural Health Monitoring of damaged structures or in other adverse events.