Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis

The increasing use of microwave and millimeter-wave radiation in communications and radar, neces sitates more understanding of dielectric properties of various human tissues for evaluation of potential hazards to human s. In this research , the dielectric properties of human skin in vivo were measur...

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Main Author:	Mohd Tamyis, Najihah
Format:	Thesis
Language:	English
Published:	2006
Subjects:	Human physiology
Online Access:	https://ir.uitm.edu.my/id/eprint/27197/2/27197.pdf
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id	my-uitm-ir.27197
record_format	uketd_dc
spelling	my-uitm-ir.271972024-04-23T08:54:18Z Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis 2006-09 Mohd Tamyis, Najihah Human physiology The increasing use of microwave and millimeter-wave radiation in communications and radar, neces sitates more understanding of dielectric properties of various human tissues for evaluation of potential hazards to human s. In this research , the dielectric properties of human skin in vivo were measured in the frequency range of 20 - 38 GHz. Complex reflection coeffici ents were measured by pressing the palm region of human skin in vivo against a waveguide sensor which consists of coaxial cables, coaxial-to-rectangular waveguide transition and Teflon ™ impedance transformer. Complex permittivities (E*) are calculated from complex reflection coefficients (Sll) by implementing a formulation of an open-ended rectangular waveguide radiating in to the half-space of lossy dielectric material. Results are reported for 42 healthy volunteers which are in the age group of 19 to 40 years. This research also provides experimental design according to the protocol guidelines given by Universiti Teknologi Mara (UiTM) ethics committee. A research protocol was under con sideration of Medical Research and Ethics Committee of the Ministry of Health , Malaysia from June 2003 to May 2004. Since June 2004 , a modified version of the protocol was under consideration by the UiTM Medical Research Ethics Committee and only been approved on April 2005 . This is the first reported result of human skin in vivo in the frequency range of 20 - 38 GHz with statistically significant number of volunteers (42 people from Malay cohort) in the age group of 19 - 40 years. As per protocol , complex reflection coefficient data were measured. Then , complex permittivities, attenuation coeffic ients and emm isivit ies were calculated in the 20 - 38 GHz frequency range. Statistical analysis was performed on the complex permittivity, skin depth and emmisivity data. Then, mean values , standard deviations values and 95% confidence interval values are reported at 15 chosen frequencies in the 20 - 38 GHz rang e. 2006-09 Thesis https://ir.uitm.edu.my/id/eprint/27197/ https://ir.uitm.edu.my/id/eprint/27197/2/27197.pdf text en public masters Universiti Teknologi MARA Faculty Electrical Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Human physiology
spellingShingle	Human physiology Mohd Tamyis, Najihah Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis
description	The increasing use of microwave and millimeter-wave radiation in communications and radar, neces sitates more understanding of dielectric properties of various human tissues for evaluation of potential hazards to human s. In this research , the dielectric properties of human skin in vivo were measured in the frequency range of 20 - 38 GHz. Complex reflection coeffici ents were measured by pressing the palm region of human skin in vivo against a waveguide sensor which consists of coaxial cables, coaxial-to-rectangular waveguide transition and Teflon ™ impedance transformer. Complex permittivities (E*) are calculated from complex reflection coefficients (Sll) by implementing a formulation of an open-ended rectangular waveguide radiating in to the half-space of lossy dielectric material. Results are reported for 42 healthy volunteers which are in the age group of 19 to 40 years. This research also provides experimental design according to the protocol guidelines given by Universiti Teknologi Mara (UiTM) ethics committee. A research protocol was under con sideration of Medical Research and Ethics Committee of the Ministry of Health , Malaysia from June 2003 to May 2004. Since June 2004 , a modified version of the protocol was under consideration by the UiTM Medical Research Ethics Committee and only been approved on April 2005 . This is the first reported result of human skin in vivo in the frequency range of 20 - 38 GHz with statistically significant number of volunteers (42 people from Malay cohort) in the age group of 19 - 40 years. As per protocol , complex reflection coefficient data were measured. Then , complex permittivities, attenuation coeffic ients and emm isivit ies were calculated in the 20 - 38 GHz frequency range. Statistical analysis was performed on the complex permittivity, skin depth and emmisivity data. Then, mean values , standard deviations values and 95% confidence interval values are reported at 15 chosen frequencies in the 20 - 38 GHz rang e.
format	Thesis
qualification_level	Master's degree
author	Mohd Tamyis, Najihah
author_facet	Mohd Tamyis, Najihah
author_sort	Mohd Tamyis, Najihah
title	Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis
title_short	Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis
title_full	Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis
title_fullStr	Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis
title_full_unstemmed	Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis
title_sort	dielectric properties of human skin in vivo in the frequency range 20-38ghz / najihah mohd tamyis
granting_institution	Universiti Teknologi MARA
granting_department	Faculty Electrical Engineering
publishDate	2006
url	https://ir.uitm.edu.my/id/eprint/27197/2/27197.pdf
_version_	1804889600474218496

Dielectric properties of human skin in vivo in the frequency range 20-38ghz / Najihah Mohd Tamyis

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