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Wireless Phase-Based Displacement Sensor Using Coupled RFID Tags
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DOI：10.1109/JSEN.2026.3669420.png)
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Abstract
En 中文
Radio frequency identification (RFID)-based sensing has emerged as a promising approach for wireless displacement monitoring, offering passive operation, low cost, and durability in harsh environments. In particular, methods that utilize the phase of backscattered signals from coupled tags have demonstrated significant potential for detecting subtle displacements. This article presents a displacement sensor based on a coupled dual-tag configuration, which achieves submillimeter resolution by tracking phase variations correlated with intertag distance. The sensing mechanism is theoretically derived and analyzed, and a method to enhance sensitivity and resolution through increased mutual coupling is proposed. To validate this method, a practical design featuring a sawtooth structure etched along adjacent tag edges is implemented. Experimental results from a fabricated prototype confirm the sensor's enhanced sensitivity, high resolution, and robust communication performance, demonstrating its viability for precise, wireless displacement sensing applications.
Keywords:
Sensors
Impedance
Sensitivity
Displacement measurement
Wireless sensor networks
Frequency measurement
Wireless communication
Phase measurement
Monitoring
Intelligent sensors
Mutual coupling
radio frequency identification (RFID)
ultrahigh frequency (UHF)
wireless sensors