Φορετή κεραία αποδοτικών επιδόσεων και περιορισμένου SAR για 5G εφαρμογές

Μακαρωνάς, Ιωάννης; Makaronas, Ioannis

dc.contributor.author	Μακαρωνάς, Ιωάννης	el
dc.contributor.author	Makaronas, Ioannis	en
dc.date.accessioned	2021-12-14T09:12:43Z
dc.date.available	2021-12-14T09:12:43Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/54164
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.21862
dc.rights	Αναφορά Δημιουργού 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/gr/	*
dc.subject	5G	en
dc.subject	Wearable antenna	en
dc.subject	Φορετή κεραία	el
dc.subject	SAR	en
dc.subject	Ανθρώπινο ομοίωμα	el
dc.subject	Human phantom	en
dc.title	Φορετή κεραία αποδοτικών επιδόσεων και περιορισμένου SAR για 5G εφαρμογές	el
heal.type	bachelorThesis
heal.classification	Engineering	en
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2021-07-01
heal.abstract	Wireless wearable devices have been a standard component of everyday life (medicine, sports, entertainment, etc.) because -through data collection and data transfer (e.g., temperature, pressure, heart rate)- the physical health of the end-user is possible to be mapped in real time. Thanks to 5G technologies, Wireless Body Area Networks (WBAN) have further enhanced their performance with higher transmission rates, shorter latency, enhanced reliability, etc. However, the fact that these devices operate at the proximity or on the body has raised the concerns of the general public regarding the human exposure to EM radiations emitted by these devices. In this context, this thesis focuses on the wearable devices and their antennas. The goal is to study, design and evaluate a wearable antenna that demonstrates the appropriate performance at 5G frequencies, as well as low levels of human exposure to EM radiation (low SAR). In detail, in Chapter 1 an extensive analysis on 5G technologies is conducted focusing on the main the challenges to be addressed. Moreover, a brief description of the existing wireless networks is given, focusing on the Wireless Body Area Networks (WBANs) and the basic features that the wearable antenna should satisfy. In Chapter 2, standard WBANs antenna technologies are studied and stimulated to select antenna technology which is suitable for this thesis. Chapter 3 focuses on the Specific Absorption Rate (SAR) and the guidelines that have been released by the standardization bodies for safe emissions. In the same chapter, a brief literature review of SAR reduction techniques is performed in order to choose the technique that is most suitable for this investigation. Finally, human phantoms that simulate the electrical properties of the human body are presented and classified in order choose the most appropriate one. In Chapter 4, the effect of the selected human phantom on the performance of the wearable antenna technology, which was chosen in Chapter 2, is studied. Thanks to the simulations, the final antenna is chosen. This antenna provides a measurable impact on SAR levels. In Chapter 5, the design of the final antenna is gradually modified and its performance is accordingly recorded. According to the simulations, the adopted SAR reduction technique is considered to be as highly efficient because it does not only significantly reduce human exposure, but also maintains antenna performance and other requirements (e.g., wearability, total weight, manufacturing cost, maintainability). Finally, Chapter 6 presents thesis conclusions and suggestions for future work.	en
heal.advisorName	Κακλαμάνη, Δήμητρα-Θεοδώρα	el
heal.advisorName	Κακλαμάνη, Δήμητρα-Θεοδώρα	el
heal.committeeMemberName	Βενιέρης, Ιάκωβος	el
heal.committeeMemberName	Παναγόπουλος, Αθανάσιος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών. Τομέας Συστημάτων Μετάδοσης Πληροφορίας και Τεχνολογίας Υλικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	100 σ.	el
heal.fullTextAvailability	false