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A novel dual-polarized reconfigurable intelligent surface (RIS) unit cell using diagonally placed mutually orthogonal tunable radiators achieves a 270-degree phase shift range, 4.5 dB maximum reflection loss, and 61 dB cross-polarization isolation at 15 GHz for 6G applications. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

June 8, 2026International Journal of Microwave and Wireless Technologies0 citationsOpen Access

6G upper mid-band independently controllable dual-polarized reconfigurable intelligent surface (RIS)

MYMehmet Ahad YurtogluFraunhofer Institute for Telecommunications, Heinrich Hertz Institute RARamez AskarFraunhofer Institute for Telecommunications, Heinrich Hertz Institute SWSven WittigFraunhofer Institute for Telecommunications, Heinrich Hertz Institute

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Abstract

Abstract This paper presents a novel, independently controllable dual-polarized reconfigurable intelligent surface (RIS) unit cell for 6G upper mid-band (7. 125 7. 125 7. 125 – 24. 25 GHz 24. 25\, GHz 24. 25 G H z) applications. The proposed unit cell is based on the diagonal placement of mutually orthogonal tunable radiators (loaded with varactor diodes) alongside static dual-polarized radiators. Full-wave electromagnetic simulations of the unit cell demonstrate a phase shift range of 270 ring 270^ 270 ∘, a maximum reflection loss of 4. 5 dB 4. 5\, dB 4. 5 d B, and 61 dB 61\, dB 61 d B cross-polarization isolation (XPI) within a 400 MHz 400\, MHz 400 M H z frequency range centered at 15 GHz 15\, GHz 15 G H

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