Linear and circular-polarization conversion in X-band using anisotropic metasurface

Area of Science:

• Electromagnetics
• Materials Science
• Nanotechnology

Background:

• Metasurfaces offer unique electromagnetic properties.
• Controlling polarization states is crucial for advanced communication systems.
• Developing multifunctional devices with wide angular stability is a key challenge.

Purpose of the Study:

• To design and demonstrate an ultrathin single-layer metasurface.
• To achieve simultaneous linear cross-polarization conversion (CPC) and linear-to-circular polarization (LP-to-CP) conversion.
• To ensure stable polarization transformation across a wide range of incidence angles.

Main Methods:

• Design of an ultrathin single-layer metasurface structure.
• Electromagnetic simulation and optimization of the unit cell.
• Analysis of polarization conversion efficiency and bandwidth.
• Investigation of angular stability for transverse-electric (TE) and transverse-magnetic (TM) polarizations.

Main Results:

• The metasurface achieves CPC over a 31.6% fractional bandwidth (8-11 GHz) with >95% efficiency.
• LP-to-CP conversion is realized in two distinct frequency bands: 7.5-7.7 GHz and 11.5-11.9 GHz.
• Stable polarization transformation is maintained for incidence angles up to 45° for both TE and TM polarizations.

Conclusions:

• The proposed metasurface is multifunctional, exhibiting both CPC and LP-to-CP conversion.
• Its simple structure, compact size, and angular stability make it suitable for various applications.
• This work advances polarization manipulation devices for communication and other electromagnetic applications.