A varactor-based 1024-element RIS design for mm-waves

Frontiers in Communications and Networks

Communications and Networks

Z. Chu¹  Pei Xiao¹  Luis G. da Silva²  Arismar Cerqueira S² 

[1] 2ICS, 5GIC & 6GIC, The University of Surrey, Guildford, United Kingdom;Laboratory WOCA (Wireless and Optical Convergent Access), National Institute of Telecommunication (Inatel), Santa Rita do Sapucai, MG, Brazil;

关键词: 6G;    B5G;    beamforming;    beam steering;    metamaterial;    reconfigurable intelligent surface;    reflectarray;   

DOI  :  10.3389/frcmn.2023.1086011

 received in 2022-10-31, accepted in 2023-03-09,  发布年份 2023

来源: Frontiers

【 摘 要 】

This paper reports a reconfigurable intelligent surface (RIS) for beamforming and beam steering applications operating in the millimeter wave (mm-waves) frequency band. The proposed 2-bit RIS design is implemented using a radar cross-section (RCS) approach in ANSYS HFSS for performance evaluation and system-level analysis. It is based on split-ring resonator (SRR) unit cells, tuned by varactor diodes, comprising 1,024 elements arranged in a 32 × 32 matrix with linear gradient phase configuration operating at 24.5 GHz over the fifth generation of mobile communications New Radio (5G NR) frequency range 2 (FR2). A beam steering from −60° to 60° in the azimuth plane is demonstrated for mm-waves coverage extension. Numerical simulations of RCS patterns from −10° to −60° and from 10° to 60° with approximately 3 dB scan loss manifest the applicability of the proposed RIS towards the sixth generation of mobile communications (6G). Furthermore, simulated results of angular reciprocity prove the RIS response up to 110° under an oblique incident wave at 60°. To the best of our knowledge, this is the highest RIS angular reciprocity reported in the literature, validating its application to coverage extension from −60° to 60°. In addition, the RCS level and reflected angle relationship are modeled for system-level analysis purposes.

【 授权许可】

Unknown   
Copyright © 2023 da Silva, Chu, Xiao and Cerqueira S.