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High-Performance Optically Transparent EMI Shielding Sandwich Structures Based on Irregular Aluminum Meshes: Modeling
Anton S Voronin1,2,3, Bogdan A Parshin1, Mstislav O Makeev1
1Regional Educational and Scientific Center "Security", Bauman Moscow State Technical University, 105005 Moscow, Russia.
Materials (Basel, Switzerland)
|September 13, 2025
Summary
Researchers developed cost-effective, transparent shielding materials using irregular aluminum mesh (IAM). These structures offer high electromagnetic shielding efficiency and optical transparency, crucial for modern wireless systems.
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.
