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Area of Science:

  • Materials Science
  • Electromagnetics
  • Optics

Background:

  • Demand for efficient shielding materials transparent in visible and IR ranges is growing.
  • Development of cost-effective methods for transparent conductors with low sheet resistance and high optical transparency is needed.

Purpose of the Study:

  • To develop and validate a complex approach for creating highly efficient, optically transparent shielding structures.
  • To model and experimentally verify the electromagnetic shielding characteristics of two-layer sandwich structures based on irregular aluminum mesh (IAM).

Main Methods:

  • Preliminary modeling of shielding characteristics using experimentally measured spectral dependences of single-layer IAM transmission coefficient.
  • Design of two-layer sandwich structures with varying IAM filling factors and fixed PMMA layer thickness.
  • Experimental measurement of shielding characteristics in the 0.01-7 GHz range and optical transparency at 550 nm.

Main Results:

  • Shielding efficiencies of 55.96 dB and 65.55 dB at 3.5 GHz were achieved.
  • Optical transparencies of 84.07% and 75.78% at 550 nm were recorded.
  • Experimental results closely matched simulation data, demonstrating good agreement.

Conclusions:

  • The proposed comprehensive approach is effective for obtaining highly efficient, low-cost, optically transparent shielding structures.
  • The developed sandwich structures exhibit superior electromagnetic shielding and uniform diffraction patterns compared to regular meshes.
  • These materials are promising for applications in modern wireless communication systems and metrology.