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  2. Faraday cage - Wikipedia

    en.wikipedia.org/wiki/Faraday_cage

    Some buildings, such as prisons, are constructed as a Faraday cage because they have reasons to block both incoming and outgoing cell phone calls by prisoners. [ 9 ] [ 10 ] The exhibit hall of the Green Bank Observatory is a Faraday cage to prevent interference with the operations of their radio telescopes .

  3. Electromagnetic shielding - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_shielding

    Electromagnetic shielding cages inside a disassembled mobile phone.. In electrical engineering, electromagnetic shielding is the practice of reducing or redirecting the electromagnetic field (EMF) in a space with barriers made of conductive or magnetic materials.

  4. Line-of-sight propagation - Wikipedia

    en.wikipedia.org/wiki/Line-of-sight_propagation

    sufficient operation of mobile phone in tunnels when supported by split cable antennas; local repeaters inside complex vehicles or buildings; A Faraday cage is composed of a conductor that completely surrounds an area on all sides, top, and bottom. Electromagnetic radiation is blocked where the wavelength is longer than any gaps.

  5. Electromagnetic interference - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_interference

    Electromagnetic interference divides into several categories according to the source and signal characteristics. The origin of interference, often called "noise" in this context, can be human-made (artificial) or natural. Continuous, or continuous wave (CW), interference arises where the source continuously emits at a given range of frequencies.

  6. Talk:Faraday cage - Wikipedia

    en.wikipedia.org/wiki/Talk:Faraday_cage

    Faraday cages also exist inside equipment. ie. inside a mobile/cell phone there is a lot of metal covers. At least some of this is for RF shielding. CRT TV/monitors (probably LCD/Plasma/LED displays too) have metal shields for various parts to stop interference getting out (& in too).

  7. Electronic article surveillance - Wikipedia

    en.wikipedia.org/wiki/Electronic_article...

    These are typically large paper bags that have been lined with multiple layers of aluminium foil to effectively shield the RF label from detection, much like a Faraday cage. A similar situation would be the loss of signal that a cell phone suffers inside an elevator: The electro-magnetic, or radio waves are effectively blocked, reducing the ...

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