Electromagnetic characterization of soil moisture and salinity for UHF RFID applications in precision agriculture

Shuvashis Dey, Nemai Karmakar, Rahul Bhattacharyya, Sanjay Sarma

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

7 Citations (Scopus)


This study focuses on the electromagnetic characterization of a novel low cost UHF RFID sensor for soil moisture and salinity content detection. A theoretical model of soil with different moisture and salinity levels is simulated along with the designed sensor. A fabricated prototype is used to measure the variation of moisture level and NaCl concentration in sandy soil. Both the simulated and measured results exhibit frequency shift of s-parameter with moisture content variation at non-saline conditions. However, if the soil is saline, the return loss amplitude gets reduced with increased salinity levels without having a significant frequency variation due to moisture contents. This allows a further optimization of the proposed sensor at the desired band and provides design robustness. A moisture content variation of as small as 35 ml along with a salinity variation of only 4 grams could be detected using the designed sensor.

Original languageEnglish
Title of host publication46th European Microwave Conference, EuMC 2016
Subtitle of host publicationLondon, United Kingdom; 4-6 October 2016
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages4
ISBN (Electronic)9782874870439
ISBN (Print)9781509015146
Publication statusPublished - 2016
EventEuropean Microwave Conference 2016 - London, United Kingdom
Duration: 4 Oct 20166 Oct 2016
Conference number: 46th


ConferenceEuropean Microwave Conference 2016
Abbreviated titleEuMC 2016
Country/TerritoryUnited Kingdom
Internet address


  • Precision agriculture
  • Q factor
  • RFID
  • Soil salinity
  • UHF

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