Ultra Wideband Radar Cross Section Reduction by Using Polarization Conversion Metasurfaces.

Area of Science:

• Electromagnetics and Metamaterials
• Antenna and Microwave Engineering

Background:

• Radar cross section (RCS) reduction is crucial for stealth applications.
• Existing metasurface designs often have limitations in bandwidth or performance.

Purpose of the Study:

• To design and validate a polarization conversion metasurface (PCM) for ultra-wideband RCS reduction.
• To achieve significant RCS reduction across a wide frequency spectrum.

Main Methods:

• A polarization conversion metasurface (PCM) utilizing double-arrow unit cells with rotational symmetry was designed.
• Simulations and measurements were conducted for TM- and TE-polarized incident waves at various angles.

Main Results:

• The proposed metasurface achieved a 10-dB RCS reduction from 9 to 40 GHz (126.5% bandwidth).
• Excellent agreement was observed between simulated and measured results for incident angles of 0°, 20°, and 40°.

Conclusions:

• The designed PCM offers effective ultra-wideband RCS reduction.
• The metasurface exhibits a low profile, light weight, and low cost, making it competitive with state-of-the-art solutions.