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Faraday cages and cables

AJJewsbury
I've read a couple of things recently and wondered if they could go together, so a theoretical question...


would you consider the screen (foil or braid) of a cable an example of a Faraday Cage?


and so could a co-ax cable be considered simply a single core screened cable (if one with carefully controlled geometry to ensure performance at high frequencies)?


   - Andy,
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    A coax (co axial) cable is a type of screened cable with a single conductor in the centre and one or more conductors wrapped around it in some way. Triax, with two separate screening layers, is quite common. Screened pairs, triples, and quads are also common. Screened twisted pairs work very well with balanced signals. Single conductor coax is better when you have an unbalanced signal.


    Various types of screen are used, often in combination, depending on the shielding requirements, spiral braid (just wrapped around), normal braid, metalic foils,metalised plastic foils. The number and size of wires in the braid as well as the angle of the wires may be calculated to give a specific performance.


    A Faraday cage gives a path for the electric field to travel along the surface of the cage rather than through it (very basic desciption) so you could describe the screens on cables as Faraday cages.


    Best regards


    Roger
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    A coax (co axial) cable is a type of screened cable with a single conductor in the centre and one or more conductors wrapped around it in some way. Triax, with two separate screening layers, is quite common. Screened pairs, triples, and quads are also common. Screened twisted pairs work very well with balanced signals. Single conductor coax is better when you have an unbalanced signal.


    Various types of screen are used, often in combination, depending on the shielding requirements, spiral braid (just wrapped around), normal braid, metalic foils,metalised plastic foils. The number and size of wires in the braid as well as the angle of the wires may be calculated to give a specific performance.


    A Faraday cage gives a path for the electric field to travel along the surface of the cage rather than through it (very basic desciption) so you could describe the screens on cables as Faraday cages.


    Best regards


    Roger
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