Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source

This thesis identifies and evaluates the effect of human body and conductive metallic objects in the vicinity of portable handheld electronic devices on antenna radiation pattern, antenna performance and Specific Absorption Rate (SAR). The presences of electronic devices in the vicinity of human bod...

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Main Author:	Othman, Nazirah
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/48732/25/NazirahOthmanMFKE2015.pdf
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id	my-utm-ep.48732
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spelling	my-utm-ep.487322020-06-21T01:10:37Z Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source 2015-03 Othman, Nazirah TK Electrical engineering. Electronics Nuclear engineering This thesis identifies and evaluates the effect of human body and conductive metallic objects in the vicinity of portable handheld electronic devices on antenna radiation pattern, antenna performance and Specific Absorption Rate (SAR). The presences of electronic devices in the vicinity of human body especially close to the human sensitive part (when the antenna is left inside the trousers pocket) allow the radiated electromagnetic wave to penetrate inside human tissues. Homogeneous and realistic body models have been considered in the simulation. The excitation is provided by means of a simple dipole and PIFA antennas as the radiating source at four different frequencies (0.4, 0.9, 1.8 and 2.4 GHz). In order to characterize the variation of SAR due to metallic items, the external metallic item and implanted medical item are used and modelled as conducting objects with their sizes chosen in order to coincide with typical sizes available. The results have shown that the presence of human body near to the antenna detuned the resonant frequency and significantly distorted the antenna radiation pattern. Nevertheless, the presence of conductive objects do not have any profound effect on antenna radiation pattern due to their size which is relatively small compared to the size of human body. Additional metallic objects close to the human leg could alter the SAR and the effect varies depending on the size and the position of the objects. In addition, the zip could significantly increase SAR inside the testicle by 50% at 0.9 GHz due to the position of zip that is close to the human sensitive organ. Nevertheless, the presence of conductive medical implant inside the leg could increase the maximum SAR by more than 400 times at 0.4 GHz. However, the medical implant has only minor effect on SAR inside the testicle. The simulation results have been validated through measurement using homogeneous body model at 2.4 GHz. 2015-03 Thesis http://eprints.utm.my/id/eprint/48732/ http://eprints.utm.my/id/eprint/48732/25/NazirahOthmanMFKE2015.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:89219 masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Othman, Nazirah Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source
description	This thesis identifies and evaluates the effect of human body and conductive metallic objects in the vicinity of portable handheld electronic devices on antenna radiation pattern, antenna performance and Specific Absorption Rate (SAR). The presences of electronic devices in the vicinity of human body especially close to the human sensitive part (when the antenna is left inside the trousers pocket) allow the radiated electromagnetic wave to penetrate inside human tissues. Homogeneous and realistic body models have been considered in the simulation. The excitation is provided by means of a simple dipole and PIFA antennas as the radiating source at four different frequencies (0.4, 0.9, 1.8 and 2.4 GHz). In order to characterize the variation of SAR due to metallic items, the external metallic item and implanted medical item are used and modelled as conducting objects with their sizes chosen in order to coincide with typical sizes available. The results have shown that the presence of human body near to the antenna detuned the resonant frequency and significantly distorted the antenna radiation pattern. Nevertheless, the presence of conductive objects do not have any profound effect on antenna radiation pattern due to their size which is relatively small compared to the size of human body. Additional metallic objects close to the human leg could alter the SAR and the effect varies depending on the size and the position of the objects. In addition, the zip could significantly increase SAR inside the testicle by 50% at 0.9 GHz due to the position of zip that is close to the human sensitive organ. Nevertheless, the presence of conductive medical implant inside the leg could increase the maximum SAR by more than 400 times at 0.4 GHz. However, the medical implant has only minor effect on SAR inside the testicle. The simulation results have been validated through measurement using homogeneous body model at 2.4 GHz.
format	Thesis
qualification_level	Master's degree
author	Othman, Nazirah
author_facet	Othman, Nazirah
author_sort	Othman, Nazirah
title	Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source
title_short	Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source
title_full	Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source
title_fullStr	Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source
title_full_unstemmed	Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source
title_sort	specific absorption rate in the presence of conductive metallic objects with close proximity radiating source
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2015
url	http://eprints.utm.my/id/eprint/48732/25/NazirahOthmanMFKE2015.pdf
_version_	1747817462257156096

Specific absorption rate in the presence of conductive metallic objects with close proximity radiating source

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