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Wideband Metal-only Reflectarray for Controlling Orthogonal Polarizations
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  • Ángel Palomares-Caballero ,
  • Carlos Molero Jiménez ,
  • Pablo Padilla ,
  • María García-Vigueras ,
  • Raphaël Gillard
Ángel Palomares-Caballero
Universidad de Granada, Universidad de Granada

Corresponding Author:[email protected]

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Carlos Molero Jiménez
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Pablo Padilla
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María García-Vigueras
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Raphaël Gillard
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Abstract

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 reflectarray 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 proposed 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). The 3-dB gain bandwidth also covers this frequency range. A prototype is fabricated with 3-D printing process based on stereolithography and a subsequent metallization. The measured results agree well with the simulated results providing an experimental validation of the proposed reflectarray design.
Mar 2023Published in IEEE Transactions on Antennas and Propagation volume 71 issue 3 on pages 2247-2258. 10.1109/TAP.2023.3240583