Enabling Intelligent Omni-Surfaces in the Polarization Domain: Principles, Implementation and Applications Palomares Caballero, Ángel Molero Jiménez, Carlos Rostami Ghadi, Farshad López Martínez, Francisco Javier Padilla De La Torre, Pablo Morales-Jimenez, David Valenzuela Valdes, Juan Francisco Research in wireless communications based on reconfigurable intelligent surfaces (RIS) has surged in the communication-theoretic arena. Recently, the RIS concept has moved into the area of 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. Development of STAR-IOS’ full and independent reconfiguration capabilities for both reflected and transmitted waves is crucial. However, such full independent reconfiguration has thus far been hampered by the intimate coupling between the transmission and reflection behavior of IOS elements. To overcome this challenge and realize the full potential of reconfigurable IOS-aided systems, in this article we 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 in, and opportunities for, new communication scenarios. 2023-11-27T09:49:09Z 2023-11-27T09:49:09Z 2023-11-23 info:eu-repo/semantics/article Á. Palomares-Caballero et al., "Enabling Intelligent Omni-Surfaces in the Polarization Domain: Principles, Implementation and Applications," in IEEE Communications Magazine, vol. 61, no. 11, pp. 144-150, November 2023. https://hdl.handle.net/10481/85872 https://doi.org/10.1109/MCOM.001.2300163 eng 61;11 http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Atribución 4.0 Internacional IEEE