Advanced Antenna Designs for 5G Communications


Hua, Qiang ORCID: 0000-0003-3125-9587 (2022) Advanced Antenna Designs for 5G Communications. Doctor of Philosophy thesis, University of Liverpool.

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Abstract

Base station antennas have been developed in the past four decades due to the evolution of cellular communication technologies. This thesis focuses on the development of 5G base station antennas and addresses some of their challenges. When upgrading to higher frequency bands for 5G, it is challenging to realize a superior mobile network because the path loss and multipath effects become more severe, especially for the coverage. Since base station antennas are well established and matured, there is little room for further development with the traditional approach. When entering the 5G era, more wireless systems and applications become part of our daily lives and the global economy. A significant challenge is how to make the wireless systems multifunctional and reconfigurable over an ultra-wideband or multi-bands. Nevertheless, the development of new material has provided a new and promising path for further developing antennas. Both indoor and outdoor base station antennas are required to support 5G networks with better performance (wide bandwidth, stable radiation pattern, etc.) and coexist with the current 2G/3G/4G networks. Meanwhile, small size, low profile and less-cost antennas are preferred. Thus, this thesis makes four significant contributions to address the above-stated problems and challenges. They can be summarized as follow: 1. A novel compact quadruple band indoor base station antenna for 2G/3G/4G/5G mobile communication systems was presented, which covers 0.69 – 0.96 GHz, 1.7 – 2.7 GHz, 3.3 – 3.8 GHz and 4.8 – 5.0 GHz with a compact size. A new optimization method was employed to optimize the antenna. 2. Two wideband (3.3 – 5.0 GHz) and dual-band (3.3 – 3.8 GHz and 4.8 – 5.0 GHz) dual-polarized outdoor base station antennas were proposed for 5G applications. Both antennas cover the desired operating frequency bands. They have high port-to-port isolation, stable radiation pattern and compact size. 3. A compact dual-polarized ultra-wideband base station antenna based on new material was designed and simulated for 5G applications. The proposed antenna covers the frequency bands from 2.29 to 5.09 GHz with a compact size and has better isolation between the two ports. It also has a simple structure. 4. An ultra-wideband waveguide and a wideband cylindrical dielectric resonator antenna were designed based on the new material. The ultra-wideband waveguide is achieved by loading the new material, which covers 0.5 to 16 GHz with a simple construction. The dielectric resonator antenna has a simple structure and wide bandwidth.

Item Type: Thesis (Doctor of Philosophy)
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 06 Sep 2022 10:04
Last Modified: 18 Jan 2023 21:04
DOI: 10.17638/03153650
Supervisors:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3153650
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