Electromagnetic Shielding Effectiveness in Enclosures
Summary
Electromagnetic shielding effectiveness (SE) quantifies the ability of a metallic or composite enclosure to attenuate incident electromagnetic fields, protecting sensitive electronics from interference, high-power pulses and unintentional coupling. The performance of an enclosure depends on material conductivity, thickness, geometry and the presence of apertures, seams or vents. At low frequencies, shielding relies primarily on reflection loss due to impedance mismatch, whereas at higher frequencies absorption loss and multiple internal reflections dominate. Apertures and penetrations introduce localised coupling paths, which can excite cavity resonances and degrade overall SE. Modern research addresses ultrawideband transients, near-field sources and complex enclosure networks, aiming to predict internal field distributions, identify resonant modes and optimise aperture design. Practical applications span aerospace, defence, telecommunications and medical electronics, where both intentional electromagnetic interference (IEMI) threats and compliance with electromagnetic compatibility (EMC) standards are critical.
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Electromagnetic Shielding Effectiveness in Enclosures publication trend
The graph below shows the total number of articles in electromagnetic shielding effectiveness in enclosures across all publications each year (not limited to Nature Index journals).
Technical terms
Shielding Effectiveness (SE): A measure in decibels of attenuation achieved by an enclosure against incident electromagnetic fields.
Aperture: An opening or slot in an enclosure wall through which fields can penetrate and couple into the cavity.
Finite Element Method (FEM): A numerical technique that subdivides the enclosure into small elements to solve electromagnetic field equations.
Time-Domain Simulation: A computational approach that tracks field evolution over time, particularly useful for transient or ultra-wideband pulses.
Equivalent Circuit Model: A representation that models apertures and cavity resonances using lumped-element or transmission-line analogues to simplify analysis.
Resonant Mode: A standing-wave pattern within an enclosure at a frequency where internal reflections constructively interfere, affecting local SE.
References
- Determination of Shielding Effectiveness of a Subnanosecond High-Power EM Interference by an Enclosure with Aperture Using Time Domain Approach. Energies (2023).
- An Analytical Evaluation of the Shielding Effectiveness of Enclosures Containing Complex Apertures. IEEE Access (2021).
- Generalized Algorithm Based on Equivalent Circuits for Evaluating Shielding Effectiveness of Electronic Equipment Enclosures. Algorithms (2023).
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