Analysis an‎d Design of Graphene Based Reflectarray an‎d Transmitarray Antennas Using Holographic Method

10/7/2026 12:00:00 AM

This dissertation investigates graphene-based reflectarray an‎d transmitarray antennas for terahertz communication applications. The primary objective is to enhance key performance metrics such as side lobe level reduction, gain improvement, expansion of the beam steering range, an‎d realization of active reconfigurable devices. These features are of significant importance for THz communication systems an‎d the emerging technologies of reconfigurable intelligent structures (RIS). In this research, first, graphene cell-clustere is introduced, an‎d appropriate analytical formulations are derived to accurately predict the far-field radiation characteristics of the reflectarray composed of graphene cell-clusteres. Based on these formulatons, optimal dimensions for the cell-clusters in reflectarray design is determined. Subsequently, a novel two layers reflectarray consists of graphene cell-clusters is designed an‎d proposed, an‎d the effect of vaious cell-cluster dimensions on its performance are comprehensively analysed. In the second part, the influence of inherent losses in graphene reflectarray structures is investigated. It is shown that theses losses can be advantageously utilized to suppres undesigred surface waves an‎d therby improve the quality of the far-field radiation pattern. Using the proposed analytical relations, the mechanisms responsible for the generation of unwanted surface waves an‎d the degradation of the main beam, are studied in detail. Furthermore, the impact of different loss levels under various operationg conditions, on the performance of the reflectarray, is examined. In the third part, a graphene based transmitarray is designed an‎d analysed. By addressing the exsisting challengs in the transmitarray performance, a novel structure with enhanced functionalities an‎d improved performance characteristics is proposed.

گرافن , آرايه انعكاسي , آرايه عبوري , هولوگرافي

Graphene , reflectarray , transmitarray , holography

Parinaz Hosseini Toodeshki

Homayoon Oraizi