Wideband 3-D-Printed Metal-only Reflectarray for Controlling Orthogonal Linear Polarizations Palomares Caballero, Ángel Molero Jiménez, Carlos Padilla De La Torre, Pablo García-Vigueras, María Gillard, Raphaël 3D unit cell Dual polarization Metal-only Millimeter waves Polarization control Reflectarray antenna This work was supported in part by the Spanish Government under Project PID2020-112545RB-C54 and, Project RTI2018-102002-A-I00, in part by “Junta de Andalucía” under Project B-TIC-402-UGR18, Project A-TIC- 608-UGR20, Project PYC20-RE-012-UGR and Project P18.RT.4830, and in part by the Predoctoral Grant FPU18/01965. (Corresponding author: Ángel Palomares-Caballero.) This paper presents a metal-only reflectarray that enables the control of incident orthogonal polarizations in a large bandwidth. The proposed reflectarray is based on a unit cell whose tuning elements allow the independent control of the reflection phase value for the vertical and horizontal impinging polarizations. Due to the symmetry of the unit cell, the same performance is produced by each polarization when its reflection phase response is modified. The proposed unit cell provides a fairly linear phase response along the frequency with a phase variation in the orthogonal polarization of ±1o. The performance under oblique incidence and the frequency limitation of the unit cell are also investigated. From this unit cell, a metal-only reflectarray that produces circular polarization from a linear polarization is designed. The reflectarray presents a simulated directivity greater than 27 dBi with an axial ratio below 1.5 dB from 32 GHz to 50 GHz (43.9% of bandwidth). A prototype is fabricated and the measured results agree well with the simulated ones. The obtained aperture efficiency is between 56% and 41% in the considered frequency band. The measured realized gain ranges from 27 dBi to 30.3 dBi where the achieved radiation efficiency is greater than 97%. 2023-05-23T11:31:02Z 2023-05-23T11:31:02Z 2023 journal article Published version: Á. Palomares-Caballero, C. Molero, P. Padilla, M. García-Vigueras and R. Gillard, "Wideband 3-D-Printed Metal-Only Reflectarray for Controlling Orthogonal Linear Polarizations," in IEEE Transactions on Antennas and Propagation, vol. 71, no. 3, pp. 2247-2258, March 2023, doi: 10.1109/TAP.2023.3240583 https://hdl.handle.net/10481/81766 10.1109/TAP.2023.3240583 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional IEEE