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Effect of moisture content variation on dielectric properties of various plant leaves at microwave

Scientific Reports · 2024 · Unclear · Insufficient evidence

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Complex permittivity of Corn, Jowar, Ashoka, and Banana leaves was measured from 500 MHz to 15 GHz at different moisture contents. Both dielectric constant (ε′) and dielectric loss (ε″) decreased as moisture content decreased; below a leaf-specific critical m…

Study snapshot

PublicationScientific Reports · 2024
Study typeexposure_assessment
Reported directionUnclear
Evidence ratingInsufficient

Abstract

Effect of moisture content variation on dielectric properties of various plant leaves at microwave frequencies Chauhan PD, Gadani DH, Rana VA. Effect of moisture content variation on dielectric properties of various plant leaves at microwave frequencies. Sci Rep. 2024 Jun 8;14(1):13204. doi: 10.1038/s41598- 024-64266-3. Abstract Complex permittivity of Corn, Jowar, Ashoka and Banana plant leaves was measured using a Vector Network Analyzer (Anritsu Shockline Model-MS46322A) over 500 MHz to 15 GHz frequency range, at different moisture contents. The dielectric constant ( ε ') and dielectric loss ( ε ′′) of the leaves decrease with decrease in moisture content over this frequency range. For the leaves having moisture content less than certain critical moisture level (CML), the values of ε ' and ε " remain almost constant with frequency variation. ε ′′ does not increase appreciably with the increase in moisture content up to CML. CML is found to vary for different types of leaves. At higher moisture level, ε ' and ε ′′ exhibit frequency dependence. Above certain moisture level in the leaves, ε ′′ starts to increase slowly with the increase in frequency above 3 GHz approaching towards the dielectric relaxation of water. The values of ε ' and ε ′′ were also measured for the extract of leaves and compared with the values calculated using Stogryn equations for the same salinity, and the results agree with the calculated values. The measured values of ε ' and ε ′′ for the leaves were compared with the values calculated using Debye-Cole dual dispersion dielectric model and are found to match very well. Open access paper: nature.com

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeexposure_assessment
Effect directionunclear
PopulationNot supplied
Sample sizeNot supplied
ExposureRF
Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Complex permittivity of Corn, Jowar, Ashoka, and Banana leaves was measured from 500 MHz to 15 GHz at different moisture contents. Both dielectric constant (ε′) and dielectric loss (ε″) decreased as moisture content decreased; below a leaf-specific critical moisture level (CML), ε′ and ε″ were almost constant with frequency. At higher moisture levels, ε′ and ε″ showed frequency dependence, and above certain moisture levels ε″ increased slowly with frequency above 3 GHz approaching dielectric relaxation of water; measurements for leaf extracts agreed with Stogryn-equation calculations and leaf measurements matched a Debye-Cole dual dispersion model.

Outcomes measured

  • Complex permittivity (dielectric constant ε′ and dielectric loss ε″) of plant leaves across moisture contents (500 MHz–15 GHz)
  • Critical moisture level (CML) characterization for different leaf types
  • Agreement of measured dielectric properties with Stogryn equations and Debye-Cole dual dispersion dielectric model
View raw extracted JSON
{
  "study_type": "exposure_assessment",
  "exposure": {
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    "source": "other",
    "frequency_mhz": null,
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  "outcomes": [
    "Complex permittivity (dielectric constant ε′ and dielectric loss ε″) of plant leaves across moisture contents (500 MHz–15 GHz)",
    "Critical moisture level (CML) characterization for different leaf types",
    "Agreement of measured dielectric properties with Stogryn equations and Debye-Cole dual dispersion dielectric model"
  ],
  "main_findings": "Complex permittivity of Corn, Jowar, Ashoka, and Banana leaves was measured from 500 MHz to 15 GHz at different moisture contents. Both dielectric constant (ε′) and dielectric loss (ε″) decreased as moisture content decreased; below a leaf-specific critical moisture level (CML), ε′ and ε″ were almost constant with frequency. At higher moisture levels, ε′ and ε″ showed frequency dependence, and above certain moisture levels ε″ increased slowly with frequency above 3 GHz approaching dielectric relaxation of water; measurements for leaf extracts agreed with Stogryn-equation calculations and leaf measurements matched a Debye-Cole dual dispersion model.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "dielectric properties",
    "complex permittivity",
    "dielectric constant",
    "dielectric loss",
    "moisture content",
    "plant leaves",
    "microwave frequencies",
    "vector network analyzer",
    "500 MHz to 15 GHz",
    "Debye-Cole model",
    "Stogryn equations",
    "dielectric relaxation of water"
  ],
  "suggested_hubs": []
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1038/s41598
PubMed: Not supplied

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