#6950. Multiband ultrathin chiral metasurface for polarization conversion, symmetric and asymmetric transmission

December 2026publication date
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Construction
Engineering
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Abstract:
This paper presents a planar chiral metasurface with two layers of omega-shaped unit cells placed on opposite sides of a substrate. The metasurface achieves linear-to-circular polarization conversion within a single band and cross-polarized transmission of linearly polarized incident waves in five bands. Due to the asymmetry and anisotropy of the metasurface in its plane, the linear-to-circular and cross-polarization conversion transmission bands are asymmetric in nature. The structure also exhibits a symmetric co-polarized transmission band for both x- and y-directed incident E-field orientations. The proposed structure gives good response for incident angles up to 600 from 3 GHz to 11.5 GHz and up to 300 from 11.5 GHz to 13.5 GHz for both transverse-electric and transverse-magnetic incidence. It is also ultrathin and has a thickness of ?0/64.7, where ?0 is the free space wavelength at the lowest frequency of operation. The proposed MS can be used for S, C, X as well as Ku microwave band applications.
Keywords:
Asymmetric transmission; Bi-anisotropy; Chiral; Multi-band; Planar; Polarization conversion; Ultrathin

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