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International Journal of Antennas and Propagation
Volume 2019, Article ID 9479010, 9 pages
https://doi.org/10.1155/2019/9479010
Research Article

A Single-Layer Dual-Band Reflectarray Cell for 5G Communication Systems

Università della Calabria, Rende, Italy

Correspondence should be addressed to Sandra Costanzo; ti.lacinu.semid@oznatsoc

Received 29 August 2018; Revised 18 December 2018; Accepted 14 January 2019; Published 11 March 2019

Guest Editor: Khalil Sayidmarie

Copyright © 2019 Sandra Costanzo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A single-layer dual-band reflectarray cell is proposed in this work for future 5G systems. A reflectarray unit cell operating at 28/38 GHz is designed by adopting two pairs of miniaturized fractal patches, offering low losses (<0.7 dB) and almost full-phase ranges (≅320°) at both operating frequencies. The proposed configuration allows to achieve very small interelement spacings and negligible mutual coupling effects between the two bands, thus assuring an independent phase-tuning mechanism at both desired frequency bands. The designed compact cell is successfully adopted to demonstrate reflectarrays’ abilities in achieving fixed scanned-beam and/or multibeam patterns, under the dual-band operation mode. Full-wave numerical validations, performed on the synthesized reflectarray structures, confirm the effectiveness of the designed dual-band configuration in achieving independent radiation patterns and quite good bandwidths, at the two designed frequencies. Thanks to its compactness and versatility in achieving both frequency diversity and multibeam/scanned-beam radiation patterns, the proposed unit cell is appealing for future 5G applications.