RF Loss Through Eucalyptus Vegetation with Varying Water Content – Modelling and Experiment

Peden, Sonam; Lamb, David; Bradbury, Ronald; Hedley, Mark

Author(s)

Peden, Sonam

Lamb, David

Bradbury, Ronald

Hedley, Mark

Publication Date

2022-04-05

Abstract

Please contact rune@une.edu.au if you require access to this thesis for the purpose of research or study.

Abstract

<p>The interaction between radio waves and vegetation has been extensively studied for efficient wireless network planning. Both empirical and analytical models have been developed for this purpose. However, radio transmission within a wireless sensor network could be used for sensing the medium in the signal path in addition to data transmission within the network. Prior work suggested that radio waves interact strongly with water contained in vegetation. The dependence of radio waves on water is through its dielectric constant. In this thesis, the relationship between RF loss and water content in vegetation in the path of a radio communications link was modelled to study the feasibility of monitoring plant health using wireless communication networks.</p> <p>A model to calculate the RF loss through packed vegetation with different moisture content was developed. This model only considers the dielectric constant of the vegetation and does not include the air component of the tree canopy. The model was further extended to calculate RF loss through tree canopies. Both the models were verified against experimental measurements acquired using Eucalyptus leaves and trees. The results show that there is a positive non-linear relationship between RF loss in dB and water content expressed as effective water path (EWP) in mm. Vegetation thickness is also a factor in RF loss, however the contribution was minor compared to water content of vegetation. This work has quantified the relationship between RF loss and water within vegetation. It may lead to wireless sensor networks being repurposed to monitor, over periods of many years, changes in plant water status.</p>

Link

https://hdl.handle.net/1959.11/56607

Language

en

Publisher

University of New England

Title

RF Loss Through Eucalyptus Vegetation with Varying Water Content – Modelling and Experiment

Type of document

Thesis Doctoral

Entity Type

Publication

Author(s)	Peden, Sonam Lamb, David Bradbury, Ronald Hedley, Mark
Publication Date	2022-04-05
Abstract	Please contact rune@une.edu.au if you require access to this thesis for the purpose of research or study.
Abstract	<p>The interaction between radio waves and vegetation has been extensively studied for efficient wireless network planning. Both empirical and analytical models have been developed for this purpose. However, radio transmission within a wireless sensor network could be used for sensing the medium in the signal path in addition to data transmission within the network. Prior work suggested that radio waves interact strongly with water contained in vegetation. The dependence of radio waves on water is through its dielectric constant. In this thesis, the relationship between RF loss and water content in vegetation in the path of a radio communications link was modelled to study the feasibility of monitoring plant health using wireless communication networks.</p> <p>A model to calculate the RF loss through packed vegetation with different moisture content was developed. This model only considers the dielectric constant of the vegetation and does not include the air component of the tree canopy. The model was further extended to calculate RF loss through tree canopies. Both the models were verified against experimental measurements acquired using Eucalyptus leaves and trees. The results show that there is a positive non-linear relationship between RF loss in dB and water content expressed as effective water path (EWP) in mm. Vegetation thickness is also a factor in RF loss, however the contribution was minor compared to water content of vegetation. This work has quantified the relationship between RF loss and water within vegetation. It may lead to wireless sensor networks being repurposed to monitor, over periods of many years, changes in plant water status.</p>
Link	https://hdl.handle.net/1959.11/56607
Language	en
Publisher	University of New England
Title	RF Loss Through Eucalyptus Vegetation with Varying Water Content – Modelling and Experiment
Type of document	Thesis Doctoral
Entity Type	Publication

RF Loss Through Eucalyptus Vegetation with Varying Water Content – Modelling and Experiment

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