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Broadband absorber with dispersive metamaterials.

WonHeum Han1, Q-Han Park1

  • 1Physics, Korea University, Seoul, Korea.

Nanophotonics (Berlin, Germany)
|December 5, 2024
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Summary

This study introduces a novel broadband microwave absorber using a dispersive metamaterial for the entire X-band (8-12 GHz). The proposed metamaterial absorber achieves excellent performance with less than -20 dB reflectance across the X-band.

Keywords:
Lorentz modelbroadband absorberelectromagnetic wave absorbersequivalent circuit modelmetamaterialperfect electric conductor

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Area of Science:

  • Electromagnetics and Metamaterials
  • Microwave Engineering
  • Materials Science

Background:

  • Metamaterial absorbers are crucial for electromagnetic wave control.
  • Achieving broadband absorption requires specific material properties, like anomalous dispersion.
  • Existing absorbers often lack efficiency across wide frequency ranges.

Purpose of the Study:

  • To propose a broadband absorber for the microwave X-band (8-12 GHz).
  • To demonstrate the realization of anomalous permittivity dispersion using a metamaterial.
  • To provide design rules for fabricating such absorbers.

Main Methods:

  • Utilizing a dispersive metamaterial with anomalous permittivity.
  • Fitting the anomalous dispersion to a two-pole Lorentz oscillator model.
  • Designing a double-layered, square-loop metamaterial structure.
  • Employing an equivalent circuit model for design explanation.

Main Results:

  • The proposed metamaterial exhibits anomalous permittivity dispersion in the X-band.
  • A 4-mm-thick absorber was fabricated using silicon rubber, resistors, and conductive ink.
  • The fabricated absorber achieved reflectance below -20 dB across the entire X-band (8-12 GHz).

Conclusions:

  • A broadband metamaterial absorber for the X-band has been successfully designed and demonstrated.
  • The design leverages anomalous dispersion, realizable with a double-layered square-loop metamaterial.
  • This work offers a practical approach to broadband microwave absorption.