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Graphene/PMMA multilayers offer excellent shielding against GHz electromagnetic radiation. Six layers provide optimal absorption around 30 GHz, demonstrating potential for transparent, flexible shielding applications.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Physics

Background:

  • Graphene's high electrical conductivity enables effective shielding of GHz electromagnetic (EM) radiation.
  • Multilayer structures can enhance EM shielding by combining individual layer properties.
  • Graphene/polymer composites are explored for advanced material applications.

Purpose of the Study:

  • To investigate the electromagnetic shielding efficiency of graphene/PMMA multilayers in the GHz range.
  • To determine the optimal number of graphene layers for maximum EM radiation absorption.
  • To validate experimental findings with theoretical calculations.

Main Methods:

  • Fabrication of graphene/PMMA multilayer structures on silica substrates.
  • Electromagnetic measurements in the Ka band (26.5–40 GHz) to assess shielding effectiveness.
  • Theoretical modeling to explain observed absorption and transmission characteristics.

Main Results:

  • Individual graphene planes exhibit good shielding efficiency against GHz EM radiation.
  • The conductivity of multiple graphene planes adds arithmetically in multilayer structures.
  • Maximum radiation absorption, peaking around 30 GHz, is achieved with six graphene/PMMA layers.
  • Experimental results are consistent with theoretical predictions for GHz domain EM behavior.

Conclusions:

  • Graphene/PMMA multilayers serve as efficient, optically transparent, and flexible shielding media.
  • The number of graphene layers significantly impacts EM shielding performance, with six layers being optimal for the studied frequency range.
  • This research highlights the potential of graphene-based composites for advanced electromagnetic shielding solutions.