Short answer
EMI/EMC shielding glass is a transparent shield: a conductive layer inside it limits the passage of electromagnetic waves. It protects sensitive electronics from outside interference and reduces leakage of their own emissions.
How it works
- Conductive wire mesh: a fine metal mesh inside the laminate acts like a Faraday cage.
- Transparent conductive coating: a thin coating on the glass does the same with a more uniform look.
- Grounding: the conductive layer is bonded to the frame with a conductive edge band and gasket. A weak edge connection means weak shielding.
Applications
- Bridges, operations centres and radar rooms of naval platforms
- Command, control and communication shelters
- Electronics compartments of armoured vehicles
- Display and control panel windows
- Test, measurement and laboratory rooms
What should the specification define?
- The frequency range to protect
- The required attenuation in that range (dB)
- The measurement method and set-up
- The required light transmission
- Ballistic, heating or optical requirements
Shielding performance is shown only by a measurement report; "EMI shielded" alone does not mean a given attenuation at a given frequency.