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Effect of thickness inhomogeneity in fat tissue on in-body microwave propagation
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0002-6899-1424
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0001-5956-0713
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0002-5796-9838
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0003-4821-8087
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2018 (English)In: 2018 IEEE International Microwave Biomedical Conference (IMBioC), Philadelphia, USA: IEEE, 2018, p. 136-138Conference paper, Published paper (Refereed)
Abstract [en]

In recent studies, it has been found that fat tissue can be used as a microwave communication channel. In this article, the effect of thickness inhomogeneities in fat tissues on the performance of in-body microwave communication at 2.45 GHz is investigated using phantom models. We considered two models namely concave and convex geometrical fat distribution to account for the thickness inhomogeneities. The thickness of the fat tissue is varied from 5 mm to 45 mm and the Gap between the transmitter/receiver and the starting and ending of concavity/convexity is varied from 0 mm to 25 mm for a length of 100 mm to study the behavior in the microwave propagation. The phantoms of different geometries, concave and convex, are used in this work to validate the numerical studies. It was noticed that the convex model exhibited higher signal coupling by an amount of 1 dB (simulation) and 2 dB (measurement) compared to the concave model. From the study, it was observed that the signal transmission improves up to 30 mm thick fat and reaches a plateau when the thickness is increased further.

Place, publisher, year, edition, pages
Philadelphia, USA: IEEE, 2018. p. 136-138
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:uu:diva-393442DOI: 10.1109/IMBIOC.2018.8428872ISBN: 978-1-5386-5918-2 (electronic)OAI: oai:DiVA.org:uu-393442DiVA, id: diva2:1353287
Conference
2018 IEEE International Microwave Biomedical Conference (IMBioC, 14-15 June 2018, Philadelphia, USA
Available from: 2019-09-22 Created: 2019-09-22 Last updated: 2019-10-10Bibliographically approved
In thesis
1. Fat-IBC: A New Paradigm for Intra-body Communication
Open this publication in new window or tab >>Fat-IBC: A New Paradigm for Intra-body Communication
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the last two decades, a significant development in the field of medical technology occurred worldwide. This development is characterized by the materialization of various body implants and worn devices, that is devices attached to the body. These devices assist doctors and paramedical staff in effectively monitoring the patient’s health and helping increase patients’ average life expectancy. Furthermore, the various implants inside the human body serve different purposes according to the humans’ needs. As this situation became more prominent, the development of protocols and of reliable transmission media is becomes essential to improve the efficiency of inter-device communications. Positive prospects of the use of human tissue for intra-body communication were proven in recent studies. Fat tissues, for example, which also work as energy banks for human beings, can be potentially used in intra-body communications as transmission media. In this thesis, the fat (adipose) tissue’s function as an intra-body communication channel was investigated. Therefore, various simulations and experimentations were performed in order to characterize the reliability of the fat tissue in terms of communication, considering, for example, the effect that the variability in the thickness of adipose and muscular tissues could have on the communication performance, and the possible effect that the variability in the transmitted signal power could have on the data packet reception. Fat tissue displays superior performance in comparison to muscle tissue in the context of a low loss communication channel. For example, at 2.45 GHz, the path losses of ~0.7 dB/cm and ~1.9 dB/cm were observed for phantom and ex-vivo measurements, respectively. At a higher frequency of 5.8 GHz, the ex-vivo path loss was around 1.4 dB/cm. It was concluded from the results that the adipose tissue could function as a reliable medium supporting intra-body communication even under low power transmitted signals. Moreover, although the presence of thick blood vessels could degrade the signal strength, the results show that communication is possible even under the presence of perturbant tissues. Overall, the results of this thesis would provide a foundation in this area and assist researchers in developing innovative and solutions for intra-body communication.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2019. p. 116
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1863
Keywords
Fat-Intrabody Communication, Fat Tissue, Microwave, Propagation, Data Packet Reception, Ex-vivo, Phantom, Communication, Reliability, Implants
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-393444 (URN)978-91-513-0770-1 (ISBN)
Public defence
2019-11-27, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2019-11-06 Created: 2019-10-10 Last updated: 2019-11-06

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Asan, Noor BadariahVelander, JacobRedzwan, SyaifulPerez, Mauricio D.Voigt, ThiemoAugustine, Robin

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