研究目的
To develop a broadband and high-efficiency polarization converter using a metasurface-based design to overcome the limitations of narrow bandwidth and low polarization conversion ratio in existing converters.
研究成果
The proposed polarization converter achieves an ultra-wideband performance with 107% bandwidth (7.5 to 24.8 GHz) and high PCR above 90%, stable under oblique incidence up to 40 degrees. It demonstrates multiple resonances enabling near-perfect polarization rotation, making it suitable for practical applications in communication systems.
研究不足
The study is based on simulations and may not account for real-world fabrication tolerances or environmental factors. The performance degradation at frequencies between 21 to 22 GHz for oblique incidence angles above 40 degrees indicates a limitation in robustness under extreme conditions.
1：Experimental Design and Method Selection:
The study employs a reflective polarization converter unit-cell designed with two diagonal V-shape patches, a central circle patch, and five diagonal vias connected to a ground plane, covered by a dielectric superstrate. Full-wave electromagnetic simulations are conducted using HFSS software to optimize geometric parameters and analyze performance.
2：Sample Selection and Data Sources:
The unit-cell is simulated with specific dimensions (e.g., via diameter of 0.5 mm, substrate thickness of 1.575 mm) using a dielectric substrate and superstrate with a permittivity of 2.65. Data on reflection coefficients (ryy and rxy) and polarization conversion ratio (PCR) are generated through simulations.
3：5 mm, substrate thickness of 575 mm) using a dielectric substrate and superstrate with a permittivity of Data on reflection coefficients (ryy and rxy) and polarization conversion ratio (PCR) are generated through simulations.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Simulation software HFSS is used; materials include metal patches, vias, dielectric layers with permittivity 2.65, and a ground plane.
4：65, and a ground plane.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The unit-cell is designed and simulated under normal and oblique incidence (up to 40 degrees). Reflection coefficients and PCR are calculated and plotted against frequency and incident angle.
5：Data Analysis Methods:
Analysis involves comparing simulated amplitudes and phases of reflection coefficients, calculating PCR, and validating performance through theoretical decomposition into u and v polarized components.
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