Broadband absorber with dispersive metamaterials

Wonheum Han, Q. Han Park

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A broadband absorber that utilizes a dispersive metamaterial and covers the entire microwave X-band (8-12 GHz) is proposed in the present study. An ideal absorber attached to the surface of a perfect electric conductor requires the permittivity of the absorbing layer to be anomalously dispersive in the targeted broad frequency band. We show that anomalous dispersion of the permittivity for the X-band can be fitted to a two-pole Lorentz oscillator model and realized with the use of a double-layered, square-loop metamaterial. We explain the connection between the two-pole oscillator model and the double-layered, square-loop metamaterial using an equivalent circuit model and present explicit design rules for the metamaterial. We fabricate a 4-mm-thick metamaterial absorber with flexible silicon rubber, a resistor element, and conductive wire using carbon and silver conductive ink. Our metamaterial absorber achieves a reflectance of less than -20 dB over the entire X-band region.

Original languageEnglish
Pages (from-to)2443-2449
Number of pages7
JournalNanophotonics
Volume12
Issue number13
DOIs
Publication statusPublished - 2023 Jun 2

Bibliographical note

Funding Information:
Research funding: This work was supported by Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1901-03.

Publisher Copyright:
© 2023 the author(s), published by De Gruyter, Berlin/Boston.

Keywords

  • Lorentz model
  • broadband absorber
  • electromagnetic wave absorbers
  • equivalent circuit model
  • metamaterial
  • perfect electric conductor

ASJC Scopus subject areas

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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