Extremely wideband low-RCS polarization conversion metasurface based on multivariate phase destructive interference.

Area of Science:

• Metamaterials and Nanophotonics
• Electromagnetics and Wave Phenomena

Background:

• Radar cross section (RCS) reduction is crucial for stealth applications.
• Existing metasurfaces often struggle with achieving wide bandwidth and polarization-independent performance.

Purpose of the Study:

• To present a polarization-modulated metasurface for improved magnitude and bandwidth of RCS reduction.
• To demonstrate a novel approach for super-wideband phase cancellation and reflection diffusion.

Main Methods:

• Designing a metasurface utilizing variable unit cell sizes and height differences.
• Implementing polarization modulation to control spatial response and achieve 2π phase shift.
• Utilizing simulation, experimental validation, and theoretical analysis.

Main Results:

• Achieved a 10 dB monostatic RCS reduction from 3.87 to 92.89 GHz (24:1 ratio bandwidth).
• Demonstrated identical performance for both polarizations under normal incidence.
• Validated simulation results with experimental data and theoretical analysis.

Conclusions:

• The proposed metasurface effectively enhances RCS reduction magnitude and bandwidth.
• The technique shows potential for suppressing various vector fields, including acoustic, electromagnetic, and optical waves.
• This work offers a promising strategy for super-wideband wave suppression.