Design, optimization, and comparative analysis of wide-band polarization conversion along with dual coding sequences...

Area of Science:

• Metamaterials and Nanophotonics
• Electromagnetics and Microwave Engineering
• Radar and Stealth Technology

Background:

• Metasurfaces offer unique electromagnetic properties for advanced applications.
• Effective polarization conversion and radar cross-section (RCS) reduction are crucial for modern electronic systems.
• Existing designs often face limitations in bandwidth or angular stability.

Purpose of the Study:

• To design and demonstrate a wideband polarization conversion metasurface.
• To tailor metasurfaces for effective radar cross-section reduction using coding and chessboard configurations.
• To investigate the performance of the metasurface under oblique incidence angles and scalability.

Main Methods:

• A compact unit cell utilizing an airgap for enhanced bandwidth was designed and simulated.
• Pancharatnam-Berry phase was employed to create 1-bit coding units for metasurface configurations.
• Scalability was assessed through 36x36 and 12x12 array assemblies.
• Radar cross-section reduction was evaluated for chessboard and coding-based metasurface patterns.

Main Results:

• The unit cell achieved over 90% polarization conversion ratio (PCR) from 7.9 to 22.7 GHz.
• Effective PCR was maintained up to 30° oblique incidence angles.
• Both chessboard and coding-based metasurfaces demonstrated substantial RCS reduction across the 7.9-22.7 GHz spectrum.
• The design proved scalable to larger array structures.

Conclusions:

• The developed metasurface exhibits excellent wideband polarization conversion and significant RCS reduction capabilities.
• The design's simplicity, bandwidth, and versatility make it suitable for diverse microwave engineering and radar stealth applications.
• This work contributes a robust and practical solution for polarization control and stealth technology.