Malau, Hadumanro Randani;
(2024)
Meta-cell and Metasurface Design for RIS Wireless Communications.
Doctoral thesis (Ph.D), UCL (University College London).
Preview |
Text
Malau_10200081_thesis.pdf Download (42MB) | Preview |
Abstract
This thesis introduces an innovative metasurface-based Reconfigurable Intelligent Surface (RIS) array design that significantly enhances beam steering control, bandwidth, and gain performance. The design offers an effective solution for overcoming non-line-of-sight (NLOS) obstacles in 5G and 6G communication networks, facilitating quasi-line-of-sight (LOS) wireless communication at millimeter-wave frequencies, specifically targeting Ka-band frequencies. The proposed design features periodic homogeneous meta-unit cells arranged over a Rogers RT-5880 substrate and ground plane. The array achieves a wideband response by designing a meta-cell with dimensions less than half a wavelength. Integrating varactor diodes with the meta-unit cells allows real-time reconfiguration of their properties, achieving tunability and reconfigurability. This concept, previously explored up to K-band frequencies, is now extended to higher frequencies used in modern wireless communication systems. This research presents a novel 8x8 metasurface-based RIS array designed to operate at a frequency of 26 GHz. The RIS array features a new resonant meta-unit cell design with controllable reflection angles for arbitrary incident angles and simple DC biasing for continuous reflection phase manipulation. Comprehensive simulation results from CST Microwave Studio and MATLAB demonstrate the effectiveness of this design. The optimization process, guided by the LCMV beamforming technique, ensures high gain and wide bandwidth with minimal interference, making it a promising solution for advanced wireless communication systems.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Meta-cell and Metasurface Design for RIS Wireless Communications |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2024. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Engineering Science Faculty Office |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10200081 |
Archive Staff Only
 |
View Item |
