Advanced Transmitarrays and Their Beam Scanning For Future Wireless Communications

Wang, Xuan

Advanced Transmitarrays and Their Beam Scanning For Future Wireless Communications

Wang, Xuan

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Publication Type:: Thesis
Issue Date:: 2021

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Field	Value	Language
dc.contributor.author	Wang, Xuan
dc.date.accessioned	2022-08-28T23:01:00Z
dc.date.available	2022-08-28T23:01:00Z
dc.date.issued	2021
dc.identifier.uri	http://hdl.handle.net/10453/160982
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	In recent years, transmitarrays have attracted growing attention for many wireless communication systems. Transmitarrays combine both optical and antenna array theories, leading to high gain, high efficiency, low cost and flexible radiation performance. In this thesis, on the basis of the state-of-the-art of transmitarrays, three main contributions are made to meet the challenges that arise from future wireless communications. The first contribution is the new approach to reduce radar cross section (RCS) of transmitarrays without sacrificing their radiation performance. Phase controllable absorptive frequency-selective transmission elements are developed for low RCS transmitarrays, providing absorption-transmission-absorption responses. Moreover, the transmission phase within the transmission band can be controlled by rotating the element. Based on these elements, a low RCS transmitarray has been designed. Compared with a reference transmitarray, the radiation performance of the low-RCS one is almost unchanged. Furthermore, significant RCS reductions have been realized in two absorption bands for wide-angle impinging electromagnetic waves. The second contribution is the development of a dual-layer wideband conformal transmitarray at E-band. The dual-layer transmitarray element is designed based on multiple Huygens resonances at different frequencies to achieve both wideband and high efficiency properties. Continuous phase compensation of 360° is achieved, reducing phase errors of the array architecture. Employing the dual-layer Huygens elements, a cylindrically conformal transmitarray at 78 GHz has been designed. The measured results show a peak realized gain of 26.6 dBi with an aperture efficiency of 35.9 % and 3-dB bandwidth of 20.4 % from 71 to 87 GHz, which can fully cover the E-band spectrum from 71 to 86 GHz. The third contribution is the development of reconfigurable transmitarrays to achieve 2-dimensional (2-D) beam scanning. A new reconfigurable dual-layer Huygens element is developed. A 1-bit phase compensation with low transmission loss is achieved by controlling two PIN diodes integrated on the element. Compared with many other reconfigurable transmitarray elements using multi-layer structures with metallic vias, the developed reconfigurable Huygens element has a simpler configuration and a simpler biasing network, leading to a very robust design. This particularly facilitates large aperture array at higher frequencies. To validate the design concept, a transmitarray prototype at 13 GHz has been designed. 2-D scanning beams within ±50° in E-plane and ±40° in H-plane are achieved. All in all, the developed advanced transmitarrays and their beam scanning represent significant knowledge advance on antenna technologies. They can find wide applications in current and future wireless communication systems.	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/10453/160982/2/02whole.pdf
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	au.edu.uts.lib/ppc
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Advanced Transmitarrays and Their Beam Scanning For Future Wireless Communications	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

In recent years, transmitarrays have attracted growing attention for many wireless communication systems. Transmitarrays combine both optical and antenna array theories, leading to high gain, high efficiency, low cost and flexible radiation performance. In this thesis, on the basis of the state-of-the-art of transmitarrays, three main contributions are made to meet the challenges that arise from future wireless communications. The first contribution is the new approach to reduce radar cross section (RCS) of transmitarrays without sacrificing their radiation performance. Phase controllable absorptive frequency-selective transmission elements are developed for low RCS transmitarrays, providing absorption-transmission-absorption responses. Moreover, the transmission phase within the transmission band can be controlled by rotating the element. Based on these elements, a low RCS transmitarray has been designed. Compared with a reference transmitarray, the radiation performance of the low-RCS one is almost unchanged. Furthermore, significant RCS reductions have been realized in two absorption bands for wide-angle impinging electromagnetic waves. The second contribution is the development of a dual-layer wideband conformal transmitarray at E-band. The dual-layer transmitarray element is designed based on multiple Huygens resonances at different frequencies to achieve both wideband and high efficiency properties. Continuous phase compensation of 360° is achieved, reducing phase errors of the array architecture. Employing the dual-layer Huygens elements, a cylindrically conformal transmitarray at 78 GHz has been designed. The measured results show a peak realized gain of 26.6 dBi with an aperture efficiency of 35.9 % and 3-dB bandwidth of 20.4 % from 71 to 87 GHz, which can fully cover the E-band spectrum from 71 to 86 GHz. The third contribution is the development of reconfigurable transmitarrays to achieve 2-dimensional (2-D) beam scanning. A new reconfigurable dual-layer Huygens element is developed. A 1-bit phase compensation with low transmission loss is achieved by controlling two PIN diodes integrated on the element. Compared with many other reconfigurable transmitarray elements using multi-layer structures with metallic vias, the developed reconfigurable Huygens element has a simpler configuration and a simpler biasing network, leading to a very robust design. This particularly facilitates large aperture array at higher frequencies. To validate the design concept, a transmitarray prototype at 13 GHz has been designed. 2-D scanning beams within ±50° in E-plane and ±40° in H-plane are achieved. All in all, the developed advanced transmitarrays and their beam scanning represent significant knowledge advance on antenna technologies. They can find wide applications in current and future wireless communication systems.

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