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Textile UHF-RFID antenna sensor for measurements of sucrose solutions in different levels of concentration

With the trend of textile antennas development, ultra high frequency (UHF, 865–868 MHz) radio frequency identification (RFID) devices using textile materials are expected to be developed in many areas for replacing or simplifying some complex RFID devices on a PCB. In this paper, we present a textile UHF-RFID tag with two sensing positions (‘radiation parts’ and ‘loop part’) for exploring the feasibility of sucrose solutions measurements and the relationship between variables of the proposed design and the sucrose solutions. The simulated and measured resonance curves of the designs both match well (−20 dB in the simulation and −15.8 dB in the measurement at 868 MHz) and the read range measured by the RFID reader (M6e kit) is 1.71 m in air. Before the tests by the solutions on the proposed designs, a test board is developed as a preparation work for confirming the relative dielectric constants of the sensing substrate area in the real measurements. Compare the results of the simulation and the real tests, the proposed design shows good feasibility by comparing the simulated and measured results in confirmed relative dielectric constants. Moreover, its two sensing positions have different sensing features. The sensing ‘radiation parts’ position shows a stable frequency operation performance but sensing range is from 1.71 m (dry) to 2.3 m, while the sensing ‘loop part’ position has a wide sensing range from 0.4 m to 1.71 m (dry) but a lower frequency operation performance.