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Open AccessArticle

Microwave Transmittance Technique Using Microstrip Patch Antennas, as a Non-Invasive Tool to Determine Soil Moisture in Rhizoboxes

1
Embrapa Instrumentation, São Carlos (SP) 13560-970, Brazil
2
Forschungszentrum Jülich/IBG-2: Plant Sciences, 52425 Jülich (NRW), Germany
3
Maastricht Science Programme, Faculty of Health, Medicine, and Life Sciences, Maastricht University—Kapoenstraat 2, 6211 KW Maastricht, The Netherlands
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in Herrmann, P.S.d.P.H.; Porto, F.N.M.P.; Sydoruk, V. Scattering Parameters Measurements with the Microwave Transmittance Technique Using a Microstrip Patch Antennas as Non-Invasive Tool for Determination of Soil Moisture. In Proceedings of the IARIA The Third International Conference on Advances in Sensors, Actuators, Metering and Sensing, Rome, Italy, 25–29 March 2018.
Sensors 2020, 20(4), 1166; https://doi.org/10.3390/s20041166
Received: 11 December 2019 / Revised: 5 February 2020 / Accepted: 17 February 2020 / Published: 20 February 2020
Investigating the growth behavior of plant root systems as a function of soil water is considered an important information for the study of root physiology. A non-invasive tool based on electromagnetic wave transmittance in the microwave frequency range, operating close to 4.8 GHz, was developed using microstrip patch antennas to determine the volumetric moisture of soil in rhizoboxes. Antennas were placed on both sides of the rhizobox and, using a vector network analyzer, measured the S parameters. The dispersion parameter S21 (dB) was also used to show the effect of different soil types and temperature on the measurement. In addition, system sensitivity, reproducibility and repeatability were evaluated. The quantitative results of the soil moisture, measured in rhizoboxes, presented in this paper, demonstrate that the microwave technique using microstrip patch antennas is a reliable, non-invasive and accurate system, and has shown potentially promising applications for measurement of rhizobox-based root phenotyping. View Full-Text
Keywords: microwave technique; transmittance; soil moisture; microstrip patch antennas; rhizobox; roots; plant phenotyping microwave technique; transmittance; soil moisture; microstrip patch antennas; rhizobox; roots; plant phenotyping
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MDPI and ACS Style

Herrmann, P.S.d.P.; Sydoruk, V.; Marques Porto, F.N. Microwave Transmittance Technique Using Microstrip Patch Antennas, as a Non-Invasive Tool to Determine Soil Moisture in Rhizoboxes. Sensors 2020, 20, 1166. https://doi.org/10.3390/s20041166

AMA Style

Herrmann PSdP, Sydoruk V, Marques Porto FN. Microwave Transmittance Technique Using Microstrip Patch Antennas, as a Non-Invasive Tool to Determine Soil Moisture in Rhizoboxes. Sensors. 2020; 20(4):1166. https://doi.org/10.3390/s20041166

Chicago/Turabian Style

Herrmann, Paulo S.d.P.; Sydoruk, Viktor; Marques Porto, Felipe N. 2020. "Microwave Transmittance Technique Using Microstrip Patch Antennas, as a Non-Invasive Tool to Determine Soil Moisture in Rhizoboxes" Sensors 20, no. 4: 1166. https://doi.org/10.3390/s20041166

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