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In this article, a chiral metasurface is proposed for controlling the linear polarization over broadband which consists of simple circular split‐ring‐resonator based unit cells on both sides of ultrathin (0.05λ at the operating frequency of 20 GHz) substrate. Across the large operating band (19.4–22.7 GHz), the structure is highly efficient with transmission efficiency greater than 0.94 and asymmetric...