Optimized Pixelated Antenna Design for Multistandard Wireless Applications

Ullah, Md Amanath

Optimized Pixelated Antenna Design for Multistandard Wireless Applications

Ullah, Md Amanath

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Publication Type:: Thesis
Issue Date:: 2023

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Field	Value	Language
dc.contributor.author	Ullah, Md Amanath
dc.date.accessioned	2024-09-30T03:26:45Z
dc.date.available	2024-09-30T03:26:45Z
dc.date.issued	2023
dc.identifier.uri	http://hdl.handle.net/10453/181088
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	Over the past decade, there has been a significant increase in the need for multi-functional antenna designs, driven by stringent design prerequisites in wireless systems. Simultaneously, different challenges arise because of the requirements for the antenna module in limited design space. Electromagnetic simulation of parametric changes in traditional patch antennas generally result in sub-optimal designs due to topological complexity. In this thesis, novel systematic approaches to design pixelated antennas to support multistandard wireless application have been presented. Firstly, a low-profile dual-band pixelated defected ground antenna has been proposed. The design introduces the idea of utilizing pixelated defected ground for efficient antenna design without depending on geometric optimization of design parameters of defected ground area, unlike conventional defected ground antenna. Compact antenna design can be achieved by making the best use of designated design space on the defected ground plane. Secondly, a systematic approach to achieve optimal design of a Pixelated Stacked Antenna has been presented. The antenna design uses pixelization on the two radiating patches to enable simultaneous optimization of multiple layers, resulting in improved optimization balance. The design methodology utilizes a combination of triangular and square pixel shapes where triangular-shaped pixels are used to form the principal radiating patch, and square-shaped pixels are implemented on the stacked parasitic patch. Thirdly, a pixelated cubic antenna with enhanced isolation and diverse radiation pattern has been presented. The issue of mutual coupling comes into effect when multiple antenna elements are closely placed together. The presented antenna system with four patches has been pixelated and optimized simultaneously to achieve desired performance and high isolation without using any additional resonators or elements. Finally, a novel approach to increasing bandwidth in log periodic antennas has been investigated. This research involves novel design of Pixelated Log Periodic Antenna (PLPA), which demonstrates remarkable improvements in bandwidth compared to conventional printed log periodic antennas of similar size. The study showcases the potential of PLPAs to achieve significant enhancements in fractional bandwidth. In the first design case, PLPAs achieved a substantial 13% increase in fractional bandwidth. Notably, in the second design case, the antenna reached an even more impressive 22.2% improvement in fractional bandwidth. It is anticipated that the presented pixelated antennas and the illustrated design methodologies in this thesis will find wide applications in present and future wireless systems to support the trend towards multistandard wireless systems to enable fast, secure, and reliable communications.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/181088/1/thesis.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	© 2023 Md Amanath Ullah
dc.rights	au.edu.uts.lib/cph
dc.title	Optimized Pixelated Antenna Design for Multistandard Wireless Applications	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

Over the past decade, there has been a significant increase in the need for multi-functional antenna designs, driven by stringent design prerequisites in wireless systems. Simultaneously, different challenges arise because of the requirements for the antenna module in limited design space. Electromagnetic simulation of parametric changes in traditional patch antennas generally result in sub-optimal designs due to topological complexity. In this thesis, novel systematic approaches to design pixelated antennas to support multistandard wireless application have been presented. Firstly, a low-profile dual-band pixelated defected ground antenna has been proposed. The design introduces the idea of utilizing pixelated defected ground for efficient antenna design without depending on geometric optimization of design parameters of defected ground area, unlike conventional defected ground antenna. Compact antenna design can be achieved by making the best use of designated design space on the defected ground plane. Secondly, a systematic approach to achieve optimal design of a Pixelated Stacked Antenna has been presented. The antenna design uses pixelization on the two radiating patches to enable simultaneous optimization of multiple layers, resulting in improved optimization balance. The design methodology utilizes a combination of triangular and square pixel shapes where triangular-shaped pixels are used to form the principal radiating patch, and square-shaped pixels are implemented on the stacked parasitic patch. Thirdly, a pixelated cubic antenna with enhanced isolation and diverse radiation pattern has been presented. The issue of mutual coupling comes into effect when multiple antenna elements are closely placed together. The presented antenna system with four patches has been pixelated and optimized simultaneously to achieve desired performance and high isolation without using any additional resonators or elements. Finally, a novel approach to increasing bandwidth in log periodic antennas has been investigated. This research involves novel design of Pixelated Log Periodic Antenna (PLPA), which demonstrates remarkable improvements in bandwidth compared to conventional printed log periodic antennas of similar size. The study showcases the potential of PLPAs to achieve significant enhancements in fractional bandwidth. In the first design case, PLPAs achieved a substantial 13% increase in fractional bandwidth. Notably, in the second design case, the antenna reached an even more impressive 22.2% improvement in fractional bandwidth. It is anticipated that the presented pixelated antennas and the illustrated design methodologies in this thesis will find wide applications in present and future wireless systems to support the trend towards multistandard wireless systems to enable fast, secure, and reliable communications.

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http://hdl.handle.net/10453/181088