A Battery-less UHF RFID sensor for soil moisture monitoring
Alsultan, Mohammed A. (Universitat Oberta de Catalunya. Internet Interdisciplinary Institute (IN3))
Melià-Seguí, Joan (Universitat Oberta de Catalunya)
Parrón Granados, Josep (Universitat Autònoma de Barcelona. Departament de Telecomunicació i Enginyeria de Sistemes)
López-Soriano, Sergio (Universitat Oberta de Catalunya. Internet Interdisciplinary Institute (IN3))

Data:	2025
Descripció:	9 pàg.
Resum:	Soil moisture monitoring is essential for optimizing irrigation strategies, enhancing crop yields, and conserving water resources in precision agriculture. Traditional sensing methods often rely on battery-powered devices, which require maintenance and periodic replacement. This work introduces a batteryless ultrahigh frequency radio frequency identification (UHF RFID) soil moisture sensor that leverages RFID technology and an interdigitated capacitor (IDC) for capacitive sensing. The proposed sensor integrates a meandered dipole antenna and an EM4152 RFID chip, enabling wireless monitoring of soil Volumetric Water Content (VWC) without the need for an external power source. The sensor's performance is validated through controlled soil moisture experiments, where capacitance readings are correlated with reference measurements from the commercial TEROS 10 soil moisture sensor. The sensor was tested and calibrated using three different soil types: sandy, clay, and a commercial combo substrate. The results demonstrate strong linear correlations with TEROS 10 measurements across all soil types, with coefficients of determination of R2 = 0. 9648 (sandy), R2 = 0. 9512 (clay), and R2 = 0. 9444 (combo). Furthermore, tests conducted at varying water contents and a read range of up to 3. 5 meters validate the sensor's robustness across different soil conditions. The findings highlight the potential of battery-less RFID-based sensing for sustainable and maintenance-free soil moisture monitoring in agricultural applications.
Ajuts:	Agencia Estatal de Investigación PID2021-122247OB-I00 Agencia Estatal de Investigación PID2021-127203OB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00174
Nota:	Altres ajuts: This work was supported in part by the Generalitat de Catalunya through NUCLIS R+D Green funded by ACCIÓ, Agency for Business Competitiveness under Grant ACE100/23/000060; and in part by the PhD Grant from Universitat Oberta de Catalunya. Alsultan.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Battery-less ; Ultra high frequency radio frequency identification (UHF-RFID) ; Soil moisture monitoring ; Capacitive sensing ; EM4152 RFID chip ; Interdigitated capacitor ; IDC ; Wireless sensor ; Precision agriculture ; Volumetric water content (VWC) ; Sustainable agriculture
Publicat a:	IEEE journal of radio frequency identification, Vol. 9 (2025) , p. 286-294, ISSN 2469-7281

DOI: 10.1109/JRFID.2025.3572843

9 p, 6.8 MB

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