Design of a Multiband C-Shaped Metasurface-Based Polarization Converter

A triple-band C-shaped metasurface structure is introduced and evaluated via simulation for polarization conversion. The C-shaped surface is composed of copper, while the substrate is formed of FR-4. The physical size of the metasurface polarizer is 7.5×7.5×2.2 mm3. The proposed polarizer operates within the frequency ranges of 5.42–5.58 GHz, 7.37–8.11 GHz, and 13.2–14.71 GHz. The polarizer facilitates linear-to-linear conversion across the frequency ranges 5.42–5.58 GHz, 7.37–8.11 GHz, and 13.2–14.71 GHz. Analyzing the critical parameters, including the magnitude ratio, phase difference, and ellipticity of the polarizer, demonstrates that the proposed polarization converter can operate across a wide range of linear-to-circular polarization conversion. Thus, it has facilitated a transition from linear to circular polarization in the 5.9–6 GHz, 6.62–6.78 GHz, 8.95–9.2 GHz, 11.5–11.85 GHz, and 16.23–16.7 GHz regions. Furthermore, the suggested geometry preserves the handedness of the circular polarizations. Furthermore, an anisotropic and stable transformation is possible up to a 30° incidence angle. The phenomenon of resonance point surface current distributions is also discussed. This metasurface-based polarization converter is multipurpose and essential for various microwave applications due to its optimal parameters and conversions across multiple frequency ranges.