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Comparison of radio frequency path loss models in soil for wireless underground sensor networks

Abdorahimi, Danial (2018)
M.Phil. thesis, University of Birmingham.

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Recent developments in electronics and wireless communication systems have enabled the expansion of low cost and low power Wireless Underground Sensor Networks. In this research existing models such as the Modified-Friis and Crim-Fresnel for RF transmission were critically reviewed and the results from these models compared with measurements obtained from laboratory and field trials. This provides a further understanding of the dielectric properties of soil affecting the attenuation of EM signals and their relationship with soil type and condition (i.e. water content, clay content and density). A new methodology has been developed to accurately measure the EM signal attenuation for a range of soil compositions. From a comparison of the results obtained during this research, it is concluded that the permittivity values extracted from the TDR can be used as an input parameter to the Modified- Friis model. In addition, results from this study showed that the Modified-Friis model based on TDR values provided a better estimation of RF attenuation compared to the conventional Modified-Friis model. This can greatly simplify the process of estimation of RF attenuation in soil by removing the sampling and laboratory analysis (i.e. particle size distribution tests) steps which are required for the conventional mixing models.

Type of Work:M.Phil. thesis.
Supervisor(s):Metje, Nicole and Chapman, David and Anthony, Carl
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Engineering, Department of Mechanical Engineering
Subjects:QC Physics
TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:8349
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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