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In this paper, a metasurface-based multi-band polarization converter is designed and demonstrated. The designed metasurface not only converts horizontal polarization into vertical and vice versa, but also exhibits linear-to-circular and circular-to-linear polarization conversion. The proposed design efficiently converts linearly polarized incident wave into cross-polarized wave within three frequency bands: 6.3–6.6 GHz, 9–10.8 GHz and 15.2–18.7 GHz. Similarly, linear-to-circular and circular-to-linear polarization conversion is achieved in six frequency bands: 6–6.1 GHz, 6.9–7 GHz, 7.1–7.2 GHz, 8–8.7 GHz, 11.3–13.4 GHz and 13.5–14.5 GHz. Moreover, both linear-cross and linear-to-circular polarization conversion maintain their conversion efficiencies against variations in the incidence angle. The physical mechanism is explained using surface current distribution. The proposed metasurface is validated by full wave simulation and experimental measurements. [ABSTRACT FROM AUTHOR]

A compact broadband cross-polarization conversion metasurface functioning in the microwave regime is realized and experimentally demonstrated. The metasurface consists of a two-dimensional periodic arrangement of anisotropic doubleslit split-ring-resonator-based unit cells printed on top of a dielectric substrate, backed by metallic cladding. The proposed metasurface converts an x- or y-polarized wave into its orthogonal polarization over a fractional bandwidth of 100% from 5– 15 GHz, both for normal as well as oblique incidence. Moreover, the sub-wavelength unit-cell size, thin dielectric substrate, and unique unit-cell design collectively make the response of the metasurface same for both polarizations and insensitive to the incidence angle. The designed structure is fabricated and tested. The measurement and simulation results are found to be consistent with each other. [ABSTRACT FROM AUTHOR]

In this letter, an ultrathin bi-layer metasurface, which exhibits half- and quarter-wave plate operation at different resonance frequencies in the microwave regime, is realized and experimentally demonstrated. The proposed metasurface not only transforms linear and circular polarizations to their corresponding cross polarizations but also achieves linear-to-circular and circular-to-linear polarization conversion in different frequency regimes. Moreover, the quarter-wave plate operation of the metasurface is quite robust to the variations in the incidence angle both for transverse-electric and transverse-magnetic polarizations. The physical mechanism behind half- and quarter-wave plate operation is elucidated through surface current distribution. Analytical results for the refractive index further elaborate on the operation of the metasurface. [ABSTRACT FROM AUTHOR]