Flexible materials for ultra wideband antenna design

The demand for ultra-wideband (UWB) antennas increases rapidly with the magnified growth of the wireless systems aiming to support wireless and mobile services by simplifying the systems and to reduce the overall device dimensions, and costs. Vast efforts are offered to the development of UWB antenn...

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Main Author:	Elmobarak Elobaid, Husameldin Abdelrahman
Format:	Thesis
Language:	English
Published:	2018
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/79272/1/HusameldinAbdelrahmanPFKE2018.pdf
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id	my-utm-ep.79272
record_format	uketd_dc
spelling	my-utm-ep.792722018-10-14T08:41:52Z Flexible materials for ultra wideband antenna design 2018 Elmobarak Elobaid, Husameldin Abdelrahman TK Electrical engineering. Electronics Nuclear engineering The demand for ultra-wideband (UWB) antennas increases rapidly with the magnified growth of the wireless systems aiming to support wireless and mobile services by simplifying the systems and to reduce the overall device dimensions, and costs. Vast efforts are offered to the development of UWB antennas that aim to improve the seamless integration with various handheld devices such as laptops, mobile phones, and vehicles such as airplanes, cars, and ships. Consequently, the mechanically flexible antennas are the most suitable for such requirements rather than the antennas based on rigid substrate technology. Hence, the antenna should be conformal and able to be conveniently conformed onto the device’s body surface or to be fabricated using the same material in which the devices are fabricated. Subsequently, in some scenarios, the flexible antenna should be optically transparent to overcome the visual impact of the massive use of the antenna in indoor and public areas. Low-cost antenna fabrication technologies are highly expected to take place in future UWB antenna requirements for more economical resource utilization. Generally, UWB systems require the antenna with high efficiency, however, maintaining a high efficiency while achieving extremely wide bandwidth in UWB system is a challenging task. Therefore, conduction and dielectric losses should be minimized in UWB antenna by using highly conductive and low dielectric loss materials. Metals are commonly used as antenna radiating elements because of their high conductivity. However, the poor mechanical flexibility of the metals limit their usage for flexible and conformal applications. The question arises if non-metallic flexible conductive materials having conductivity close to metals can be integrated into the flexible dielectric materials to replace metals. This thesis proposes fabrication techniques to integrate flexible conductive materials into flexible dielectric materials to fabricate transparent UWB antenna and Polymer Matrix Composite (PMC) antenna with improved performance for conformal applications. Moreover, the research evaluates a new low-cost instant printing technique to print UWB flexible antenna with good performance. A technique is proposed to integrate a transparent conductive fabric tissue into a transparent PDMS to fabricate a flexible and transparent UWB antenna with improved performance. The fabricated antenna exhibited an efficiency over 75% and a maximum gain of 4.5 dBi. Moreover, an integration process is proposed to fabricate a flexible PMC composite UWB antenna by integrating the conductive fabric tissue into Eglass fiber mate using Vacuum Infusion Process (VIP). The technology is assessed by fabricating UWB antenna for conformal applications and the results showed high efficiency over 80% for the UWB antenna. Furthermore, a UWB antenna is printed instantly onto a Polyethylene Terephthalate (PET) substrate based on chemical sintering silver inkjet technology using ordinary inkjet printer and the measured results present over 80% of efficiency for antenna. ABSTRACT 2018 Thesis http://eprints.utm.my/id/eprint/79272/ http://eprints.utm.my/id/eprint/79272/1/HusameldinAbdelrahmanPFKE2018.pdf application/pdf en public phd doctoral 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 Elmobarak Elobaid, Husameldin Abdelrahman Flexible materials for ultra wideband antenna design
description	The demand for ultra-wideband (UWB) antennas increases rapidly with the magnified growth of the wireless systems aiming to support wireless and mobile services by simplifying the systems and to reduce the overall device dimensions, and costs. Vast efforts are offered to the development of UWB antennas that aim to improve the seamless integration with various handheld devices such as laptops, mobile phones, and vehicles such as airplanes, cars, and ships. Consequently, the mechanically flexible antennas are the most suitable for such requirements rather than the antennas based on rigid substrate technology. Hence, the antenna should be conformal and able to be conveniently conformed onto the device’s body surface or to be fabricated using the same material in which the devices are fabricated. Subsequently, in some scenarios, the flexible antenna should be optically transparent to overcome the visual impact of the massive use of the antenna in indoor and public areas. Low-cost antenna fabrication technologies are highly expected to take place in future UWB antenna requirements for more economical resource utilization. Generally, UWB systems require the antenna with high efficiency, however, maintaining a high efficiency while achieving extremely wide bandwidth in UWB system is a challenging task. Therefore, conduction and dielectric losses should be minimized in UWB antenna by using highly conductive and low dielectric loss materials. Metals are commonly used as antenna radiating elements because of their high conductivity. However, the poor mechanical flexibility of the metals limit their usage for flexible and conformal applications. The question arises if non-metallic flexible conductive materials having conductivity close to metals can be integrated into the flexible dielectric materials to replace metals. This thesis proposes fabrication techniques to integrate flexible conductive materials into flexible dielectric materials to fabricate transparent UWB antenna and Polymer Matrix Composite (PMC) antenna with improved performance for conformal applications. Moreover, the research evaluates a new low-cost instant printing technique to print UWB flexible antenna with good performance. A technique is proposed to integrate a transparent conductive fabric tissue into a transparent PDMS to fabricate a flexible and transparent UWB antenna with improved performance. The fabricated antenna exhibited an efficiency over 75% and a maximum gain of 4.5 dBi. Moreover, an integration process is proposed to fabricate a flexible PMC composite UWB antenna by integrating the conductive fabric tissue into Eglass fiber mate using Vacuum Infusion Process (VIP). The technology is assessed by fabricating UWB antenna for conformal applications and the results showed high efficiency over 80% for the UWB antenna. Furthermore, a UWB antenna is printed instantly onto a Polyethylene Terephthalate (PET) substrate based on chemical sintering silver inkjet technology using ordinary inkjet printer and the measured results present over 80% of efficiency for antenna. ABSTRACT
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Elmobarak Elobaid, Husameldin Abdelrahman
author_facet	Elmobarak Elobaid, Husameldin Abdelrahman
author_sort	Elmobarak Elobaid, Husameldin Abdelrahman
title	Flexible materials for ultra wideband antenna design
title_short	Flexible materials for ultra wideband antenna design
title_full	Flexible materials for ultra wideband antenna design
title_fullStr	Flexible materials for ultra wideband antenna design
title_full_unstemmed	Flexible materials for ultra wideband antenna design
title_sort	flexible materials for ultra wideband antenna design
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2018
url	http://eprints.utm.my/id/eprint/79272/1/HusameldinAbdelrahmanPFKE2018.pdf
_version_	1747818188185272320

Flexible materials for ultra wideband antenna design

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