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Enabling Intelligent Omni-Surfaces in the Polarization Domain: Principles, Implementation and Applications
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  • Ángel Palomares-Caballero ,
  • Carlos Molero Jiménez ,
  • Farshad Rostami Ghadi ,
  • F. Javier López-Martínez ,
  • Pablo Padilla ,
  • David Morales-Jimenez ,
  • Juan Valenzuela-Valdés
Ángel Palomares-Caballero
Universidad de Granada, Universidad de Granada, Universidad de Granada

Corresponding Author:[email protected]

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Carlos Molero Jiménez
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Farshad Rostami Ghadi
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F. Javier López-Martínez
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Pablo Padilla
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David Morales-Jimenez
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Juan Valenzuela-Valdés
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Abstract

Wireless communications based on reconfigurable intelligent surfaces (RIS) have upsurged as a key research topic in the communication-theoretic arena. Recently, the RIS concept has evolved into the so-called simultaneously transmitting and reflecting intelligent omni-surfaces (STAR-IOS, or simply IOS), which extend the RIS functionality by incorporating transmission (in addition to reflection) capabilities. To realize STAR-IOS, full and independent reconfiguration capabilities for both reflected and transmitted waves are crucially required. However, such full independent reconfiguration has thus far been hurdled by the intimate coupling between the transmission and reflection behaviour of the IOS elements. To overcome this challenge and realize the full potential of reconfigurable IOS-aided systems, we here advocate for the use of the polarization domain in the design and operation of STAR-IOS. Thanks to the polarization- dependent features of IOS elements, fully independent (reconfigurable) transmission and reflection modes can be delivered, thus bringing key performance improvements and opportunities for new communication scenarios.
Nov 2023Published in IEEE Communications Magazine volume 61 issue 11 on pages 144-150. 10.1109/MCOM.001.2300163