{
  "id": "shielding:shielding-mesh",
  "collection": "shielding",
  "slug": "mesh",
  "name": "Metal mesh and expanded-metal screen",
  "summary": "Woven or expanded metal used in wall build-ups, vents and window screens; attenuation depends on aperture size relative to wavelength, so a mesh that works at 900 MHz can leak badly at 5 GHz.",
  "status": "verified",
  "lastVerified": "2026-08-12",
  "data": {
    "aliases": [
      "faraday mesh",
      "shielding screen",
      "wire mesh"
    ],
    "form": "mesh",
    "attenuation": {
      "value": 20,
      "max": 40,
      "band": "aperture dependent; performance degrades as wavelength approaches aperture size",
      "sourceIds": [
        "sbm-2024"
      ]
    },
    "targets": [
      "radiofrequency"
    ],
    "requiresGrounding": true,
    "failureModes": [
      "Aperture too large for the frequency of interest: mesh is a low-pass structure",
      "Panels not bonded to each other, leaving slot antennas at every seam",
      "Corrosion at fixings destroys electrical continuity over time"
    ],
    "related": [
      "quantities:attenuation"
    ]
  },
  "sources": [
    {
      "id": "sbm-2024",
      "title": "Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)",
      "publisher": "Institut für Baubiologie + Nachhaltigkeit (IBN)",
      "url": "https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf",
      "year": 2024,
      "kind": "ngo",
      "retrieved": "2026-08-12"
    }
  ],
  "links": {
    "self": "https://emfbase.com/api/shielding/mesh",
    "html": "https://emfbase.com/shielding/mesh",
    "markdown": "https://emfbase.com/shielding/mesh.md",
    "collection": "https://emfbase.com/api/shielding"
  }
}