A Broadband Metasurface Based Reflective Type Polarizer for Cross Polarization and Linear‐to‐Circular Polarization Conversion With Minimal Null Operation Zone

Abstract Herein, we put forward an ultra‐thin and highly efficient multifunctional wideband reflective polarization converter metasurface for the manipulation of polarization state of the electromagnetic wave. Strong anisotropic characteristics have been achieved by employing a diagonally kept double‐sided modified arrow on single layer FR4 substrate backed with copper. Numerical studies show that on one hand, the realized metasurface is capable to convert a linearly polarized (LP) wave ( y / x ) into its orthogonal counterpart ( x / y ) over 6.35–9.00 GHz and 15.47–16.03 GHz exceeding 90% polarization conversion ratio. On the other hand, it efficiently transforms the LP wave into reflected circularly polarized (CP) wave over 5.32–6.15 GHz, 9.50–15.22 GHz, and 16.24–17.45 GHz with an axial ratio lower than 3 dB. It is investigated that the type of circular polarization is right‐handed over first two above bands while showing left‐handed in the last band. Due to the minimum level of tolerance in reflection phases (<22°) with respect to the acceptable limits, the proposed unit‐cell exhibits exceptional CP and cross polarization characteristics in the given bands. An array of 33 × 33 unit‐cells is created as a prototype and tested experimentally to confirm the suggested structure.