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Ultra-Wideband Electromagnetic Composite Absorber Based on Pixelated Metasurface with Optimization Algorithm.

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Summary

This study introduces a novel ultra-wideband electromagnetic absorber using advanced metasurfaces and composite materials. The durable absorber achieves over 90% absorption across a broad frequency range, validated by simulations and measurements.

Keywords:
absorbercompositegenetic algorithmmetamaterialsmetasurfacesultra-wideband

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Area of Science:

  • Electromagnetic compatibility
  • Materials science
  • Metamaterials

Background:

  • Electromagnetic (EM) absorbers are crucial for reducing unwanted signal reflections in various applications.
  • Existing absorbers often face limitations in bandwidth, durability, or performance under diverse environmental conditions.
  • Developing robust, wideband EM absorbers is essential for advanced electronic systems and defense applications.

Purpose of the Study:

  • To propose and validate a novel ultra-wideband (UWB) electromagnetic absorber.
  • To enhance absorber durability using composite materials for military applications.
  • To achieve high absorption rates over an extensive frequency spectrum.

Main Methods:

  • Design of an UWB absorber incorporating two thin metasurfaces with 1-bit pixelated patterns.
  • Optimization of metasurface patterns using a genetic algorithm.
  • Integration of glass fiber reinforced polymer (GFRP) and carbon fiber reinforced polymer (CFRP) for structural integrity.
  • Full-wave electromagnetic simulation and experimental validation using the Naval Research Laboratory (NRL) arch method.
  • Environmental testing including high temperature and humidity exposure.

Main Results:

  • Simulated absorption rate exceeding 90% from 2.2 to 18 GHz, yielding a fractional bandwidth of approximately 156%.
  • Consistent performance for incidence angles ranging from 0° to 30°.
  • Experimental measurements closely correlated with simulation results.
  • Demonstrated durability through high temperature and humidity tests under military environmental conditions.

Conclusions:

  • The proposed UWB electromagnetic absorber exhibits excellent performance with a wide operational bandwidth and high absorption efficiency.
  • The incorporation of GFRP and CFRP composite materials significantly enhances the absorber's durability, making it suitable for demanding military environments.
  • The validated design offers a promising solution for advanced electromagnetic shielding and stealth applications.