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Multiband and multifunctional polarization converter using an asymmetric metasurface
Negin Pouyanfar1, Javad Nourinia2, Changiz Ghobadi2
1Department of Electrical Engineering, Urmia University, Urmia, Iran. n.pouyanfar@urmia.ac.ir.
Scientific Reports
|April 30, 2021
Summary
This study presents a compact metasurface capable of converting electromagnetic waves. It efficiently transforms linear polarization to orthogonal linear and circular polarizations across multiple frequency bands.
Area of Science:
- Electromagnetics
- Metamaterials
- Nanophotonics
Background:
- Polarization conversion is crucial for advanced electromagnetic applications.
- Metasurfaces offer novel ways to manipulate electromagnetic waves with subwavelength structures.
Purpose of the Study:
- To design and demonstrate a compact, asymmetric multi-band reflective polarization converter metasurface.
- To achieve efficient conversion of linearly polarized waves to orthogonal linear and circular polarizations.
Main Methods:
- Design of a metasurface composed of a square with curves and a Split Ring Resonator (SRR).
- Electromagnetic simulations to analyze polarization conversion performance.
- Fabrication and measurement of a prototype for experimental validation.
Main Results:
- The metasurface successfully converts y-polarized waves to orthogonal linear polarization (15.5-16.5 GHz) and circular polarizations (RHCP at 13 GHz, LHCP at 18 GHz).
- High conversion efficiency and wide angular stability (up to 60°) were achieved.
- Analysis of surface currents and equivalent circuit confirmed the conversion mechanism.
Conclusions:
- The proposed metasurface demonstrates effective multi-band polarization conversion capabilities.
- The design exhibits excellent performance metrics, including efficiency and angular stability.
- The validated results confirm the practical applicability of the metasurface for electromagnetic wave manipulation.
