Broadband and Tunable RCS Reduction using High-order Reflections and Salisbury-type Absorption Mechanisms

Area of Science:

• Electromagnetics
• Materials Science
• Metamaterials

Background:

• Radar cross section (RCS) reduction is crucial for stealth applications.
• Traditional methods often lack tunability or broadband performance.
• Graphene's tunable properties offer potential for advanced electromagnetic devices.

Purpose of the Study:

• To propose a novel broadband and tunable RCS reduction structure.
• To investigate a hybrid physical mechanism combining high-order reflections and Salisbury-type absorption.
• To demonstrate dynamic control over RCS reduction levels.

Main Methods:

• Designing a hybrid structure integrating a high-index grating with a graphene-based Salisbury screen.
• Utilizing plane wave illumination at normal incidence for simulations and experiments.
• Analyzing scattering field distributions and surface power loss density.

Main Results:

• Achieved tunable RCS reduction from 4.1 to 18 GHz.
• Demonstrated broadband performance through high-order reflection beams.
• Validated simulation results with experimental data.

Conclusions:

• The proposed hybrid structure effectively reduces RCS over a broad bandwidth.
• Tunable RCS reduction is achievable by adjusting graphene surface resistance.
• The structure offers a promising solution for adaptive stealth technologies.