Faraday cage
A continuous grounded conductive enclosure. Effective in principle, and in practice limited entirely by its apertures.
physics
Last verified 12 August 2026.
- Category
- physics
Definition
A Faraday cage excludes external electric fields and, if the conductor is continuous relative to the wavelength, radiofrequency fields. It does not exclude low-frequency magnetic fields, which pass through ordinary conductors essentially unattenuated. Any aperture larger than a small fraction of the wavelength behaves as a slot antenna, so seams and openings determine real performance — and a transmitter left inside a partial enclosure raises levels within it by reflection.
Sources
- sbm-2024 Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024) — Institut für Baubiologie + Nachhaltigkeit (IBN), 2024. ngo, link checked 2026-08-12.
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