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An absorptive coding metasurface for ultra-wideband radar cross-section reduction.

Baoqin Lin1, Wenzhun Huang2, Jianxin Guo2

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This study introduces an absorptive coding metasurface (ACM) for ultra-wideband radar cross section (RCS) reduction. The novel design achieves significant RCS reduction across a broad frequency range and various incident angles, enhancing stealth capabilities.

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Area of Science:

  • Electromagnetics
  • Materials Science
  • Metamaterials

Background:

  • Metasurfaces offer advanced control over electromagnetic waves.
  • Radar cross section reduction is crucial for stealth applications.
  • Ultra-wideband (UWB) performance presents significant design challenges.

Purpose of the Study:

  • To propose and design an absorptive coding metasurface (ACM) for UWB RCS reduction.
  • To investigate the performance of a lossy polarization conversion metasurface (PCM) as a building block.
  • To demonstrate the ACM's effectiveness under various polarizations and incident angles.

Main Methods:

  • Design of a lossy, anisotropic PCM with polarization conversion and absorption.
  • Utilizing the PCM as coding elements in an ACM configuration.
  • Simulation and experimental validation of the ACM's RCS reduction performance.

Main Results:

  • The lossy PCM exhibits co-polarization reflection coefficients < -10 dB from 7.5 to 45.2 GHz.
  • The ACM achieves effective RCS reduction from 7.4 to 45.5 GHz (6.15:1 bandwidth) at normal incidence.
  • UWB RCS reduction is maintained even at a 45° incident angle.

Conclusions:

  • The proposed ACM demonstrates excellent UWB RCS reduction capabilities.
  • The design shows practical stealth performance against various radar bands (X, Ku, K, Ka).
  • The ACM is a promising solution for enhancing the stealth of platforms.