Advanced Multi-Band Shared-Aperture Antenna Arrays

Sun, Shangyi

Advanced Multi-Band Shared-Aperture Antenna Arrays

Sun, Shangyi

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Publication Type:: Thesis
Issue Date:: 2026

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Field	Value	Language
dc.contributor.author	Sun, Shangyi
dc.date.accessioned	2026-07-27T00:57:07Z
dc.date.available	2026-07-27T00:57:07Z
dc.date.issued	2026
dc.identifier.uri	http://hdl.handle.net/10453/195804
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	The rapid evolution of communication systems, along with the continuous pursuit of platform miniaturization and cost efficiency, requires multiple antennas operating at different frequencies to share an extremely limited space to simultaneously support various standards. The coexistence of different antennas results in strong mutual interference, namely scattering and coupling, which leads to severe distortion of radiation patterns as well as degradation in isolation and impedance matching. Achieving simultaneous suppression of both scattering and coupling over wide bands remains a critical challenge in the design of high-performance multiband shared-aperture antenna arrays. The first contribution of this thesis is the realization of simultaneous suppression of cross-band scattering, cross-band coupling, and in-band coupling in a dual-band shared-aperture antenna array. Three multi-functional suppression structures, namely 2.5-dimensional cloak, defected ground structure, and resonance shifter, are proposed for the low-band (LB) and high-band (HB) antennas in the array. Moreover, the proposed suppression methods exhibit high robustness and universality. The second contribution of this thesis is the development of methods for wideband simultaneous suppression of scattering and coupling in a dual-band antenna array. A segmented spiral LB radiator capable of scattering suppression across an ultra-wide band is designed under the guidance of characteristic mode analysis (CMA). With the help of serial resonators, the LB antenna achieves wideband impedance matching. The HB antennas loaded with parallel resonance shifters not only suppress the scattering generated in the LB but also achieve wideband matching. The third contribution of this thesis is the development of a tri-band antenna array featuring wideband suppression of scattering and coupling. The LB antenna, employing the segmented spiral and serial resonators, realizes scattering suppression across both the MB and HB, which cover the expected 5G-Advanced and 6G bands, while its operating band covers the entire 5G sub-6 GHz range. The middle-band (MB) and HB antennas adopt a planar magnetoelectric dipole structure, which prevents common-mode resonance and mitigates scattering. Furthermore, general suppression methods for tri-band arrays are developed. In this thesis, the various scattering and coupling suppression methods developed for dual-band or tri-band shared-aperture antenna arrays effectively restore the radiation patterns while enhancing cross-band and in-band isolation over wide bandwidths. The measured results for all array prototypes show good agreement with simulation results. These techniques are applicable to current and future terrestrial and non-terrestrial wireless communication platforms, including but not limited to base stations, satellites, and unmanned aerial vehicles (UAVs).	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/10453/195804/1/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	© 2026 Shangyi Sun
dc.rights	au.edu.uts.lib/cph
dc.title	Advanced Multi-Band Shared-Aperture Antenna Arrays	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

The rapid evolution of communication systems, along with the continuous pursuit of platform miniaturization and cost efficiency, requires multiple antennas operating at different frequencies to share an extremely limited space to simultaneously support various standards. The coexistence of different antennas results in strong mutual interference, namely scattering and coupling, which leads to severe distortion of radiation patterns as well as degradation in isolation and impedance matching. Achieving simultaneous suppression of both scattering and coupling over wide bands remains a critical challenge in the design of high-performance multiband shared-aperture antenna arrays. The first contribution of this thesis is the realization of simultaneous suppression of cross-band scattering, cross-band coupling, and in-band coupling in a dual-band shared-aperture antenna array. Three multi-functional suppression structures, namely 2.5-dimensional cloak, defected ground structure, and resonance shifter, are proposed for the low-band (LB) and high-band (HB) antennas in the array. Moreover, the proposed suppression methods exhibit high robustness and universality. The second contribution of this thesis is the development of methods for wideband simultaneous suppression of scattering and coupling in a dual-band antenna array. A segmented spiral LB radiator capable of scattering suppression across an ultra-wide band is designed under the guidance of characteristic mode analysis (CMA). With the help of serial resonators, the LB antenna achieves wideband impedance matching. The HB antennas loaded with parallel resonance shifters not only suppress the scattering generated in the LB but also achieve wideband matching. The third contribution of this thesis is the development of a tri-band antenna array featuring wideband suppression of scattering and coupling. The LB antenna, employing the segmented spiral and serial resonators, realizes scattering suppression across both the MB and HB, which cover the expected 5G-Advanced and 6G bands, while its operating band covers the entire 5G sub-6 GHz range. The middle-band (MB) and HB antennas adopt a planar magnetoelectric dipole structure, which prevents common-mode resonance and mitigates scattering. Furthermore, general suppression methods for tri-band arrays are developed. In this thesis, the various scattering and coupling suppression methods developed for dual-band or tri-band shared-aperture antenna arrays effectively restore the radiation patterns while enhancing cross-band and in-band isolation over wide bandwidths. The measured results for all array prototypes show good agreement with simulation results. These techniques are applicable to current and future terrestrial and non-terrestrial wireless communication platforms, including but not limited to base stations, satellites, and unmanned aerial vehicles (UAVs).

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