Multibeam Antenna Design For Advanced Wireless Communication Systems

Wen, Yubo

Multibeam Antenna Design For Advanced Wireless Communication Systems

Wen, Yubo

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Publication Type:: Thesis
Issue Date:: 2023

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Field	Value	Language
dc.contributor.author	Wen, Yubo
dc.date.accessioned	2024-04-21T23:07:34Z
dc.date.available	2024-04-21T23:07:34Z
dc.date.issued	2023
dc.identifier.uri	http://hdl.handle.net/10453/178152
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	Multibeam antennas (MBAs) have gained significant attention as essential components in the development of advanced wireless communication systems, particularly for Beyond Fifth Generation (B5G) and Sixth Generation (6G) networks. They enhance beam coverage, serving multiple users simultaneously with commercial advantages over digital or hybrid alternatives. Chapter 1 discusses the background of MBA design and applications. Chapter 2 provides a comprehensive review of the Fourier transform (FT), a valuable tool in antenna analysis and design. This review establishes the foundational basis for the subsequent analysis discussed in the following chapters. In the next few chapters, this thesis focuses on three critical issues in MBA design: coverage, compactness, and directivity. In the third chapter, the thesis explores the coverage aspect of MBAs, with a specific focus on full azimuthal coverage. As an example, the thesis presents a design of a multiport circular array of endfire Yagi-Uda monopoles. The thesis investigates and mitigates the known issue of a vertical monopole antenna on a finite-sized ground plane radiating an elevated beam. The simulated and measured results of a sector of this circular array validate the concepts. The thesis then explores the utilization of metamaterials or metasurfaces to achieve compact MBA designs. In the fourth chapter, fundamental concepts of modeling metasurfaces are reviewed, starting from general sheet transition conditions (GSTCs) and extending to impedance boundary conditions (IBCs). Based on IBCs and modulated metasurfaces (MTS), the single beam compact antennas and a seven-beam antenna have been designed. Furthermore, in the fifth chapter, the thesis explores the application of the shared aperture approach to enhance the directivity of each MBA beam. The thesis addresses the challenges of mutual interference between different impedance modulations in MTS and presents a design method. A seven-beam MTS antenna validates the design method, and the fabrication and measurement of the antenna confirm its successful implementation. In the final chapter, the conclusion is presented along with a discussion on potential future work. In summary, this research contributes to advancing MBA technologies, enhancing coverage, compactness, and directivity for specific antenna designs.	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/10453/178152/1/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 Yubo Wen
dc.rights	au.edu.uts.lib/cph
dc.title	Multibeam Antenna Design For Advanced Wireless Communication Systems	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

Multibeam antennas (MBAs) have gained significant attention as essential components in the development of advanced wireless communication systems, particularly for Beyond Fifth Generation (B5G) and Sixth Generation (6G) networks. They enhance beam coverage, serving multiple users simultaneously with commercial advantages over digital or hybrid alternatives. Chapter 1 discusses the background of MBA design and applications. Chapter 2 provides a comprehensive review of the Fourier transform (FT), a valuable tool in antenna analysis and design. This review establishes the foundational basis for the subsequent analysis discussed in the following chapters. In the next few chapters, this thesis focuses on three critical issues in MBA design: coverage, compactness, and directivity. In the third chapter, the thesis explores the coverage aspect of MBAs, with a specific focus on full azimuthal coverage. As an example, the thesis presents a design of a multiport circular array of endfire Yagi-Uda monopoles. The thesis investigates and mitigates the known issue of a vertical monopole antenna on a finite-sized ground plane radiating an elevated beam. The simulated and measured results of a sector of this circular array validate the concepts. The thesis then explores the utilization of metamaterials or metasurfaces to achieve compact MBA designs. In the fourth chapter, fundamental concepts of modeling metasurfaces are reviewed, starting from general sheet transition conditions (GSTCs) and extending to impedance boundary conditions (IBCs). Based on IBCs and modulated metasurfaces (MTS), the single beam compact antennas and a seven-beam antenna have been designed. Furthermore, in the fifth chapter, the thesis explores the application of the shared aperture approach to enhance the directivity of each MBA beam. The thesis addresses the challenges of mutual interference between different impedance modulations in MTS and presents a design method. A seven-beam MTS antenna validates the design method, and the fabrication and measurement of the antenna confirm its successful implementation. In the final chapter, the conclusion is presented along with a discussion on potential future work. In summary, this research contributes to advancing MBA technologies, enhancing coverage, compactness, and directivity for specific antenna designs.

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http://hdl.handle.net/10453/178152