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Wideband 3-D-Printed Metal-only Reflectarray for Controlling Orthogonal Linear 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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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 ±1°. 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%
Mar 2023Published in IEEE Transactions on Antennas and Propagation volume 71 issue 3 on pages 2247-2258. 10.1109/TAP.2023.3240583