Design of an Effective Multiband Linear and Circular Polarization Converter Using Reflective Metasurface

This paper presents a design for a metasurface-based polarization converter. The converter features a metallic circle intersected by a gap of a 45° inclined cross, creating four quadrant-like segments, along with an intermediate dielectric layer and a bottom metal layer. This configuration allows for both linear cross-polarization and linear-to-circular polarization conversion. Simulations indicate that the converter effectively transforms a linearly polarized incident wave into its orthogonal counterpart within frequency bands of 7.85 GHz to 8.33 GHz and 14.95 GHz to 17.8 GHz, and into a circularly polarized wave within the ranges of 7.385 GHz to 7.63 GHz, 8.645 GHz to 10.11 GHz, and 11.13 GHz to 14.035 GHz. The design maintains moderate angular stability up to 30° oblique incidence while achieving high efficiency, demonstrating its practical applicability. The proposed metasurface is suitable for use in electromagnetic measurements, stealth technology, antenna designs and sensor applications. Additionally, this configuration can be adjusted to create wideband polarization converters for different frequency bands.