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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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    Feeling distinctly rusty on the theory of all this but I seem to remember that a in a twisted pair screened cable the signal is travelling down the conductors and is shielded from outside interference by the screen. With more than one twisted pair in a screened cable the lay or length of a twist is different for each pair to minimise interference.

    In a co-ax cable the signal is a radio wave travelling down the insulation and effectively bouncing off the centre conductor and the screen. The more fresh air in the insulation the better but there has to e enough solid material to keep the shape circular.

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    Feeling distinctly rusty on the theory of all this but I seem to remember that a in a twisted pair screened cable the signal is travelling down the conductors and is shielded from outside interference by the screen. With more than one twisted pair in a screened cable the lay or length of a twist is different for each pair to minimise interference.

    In a co-ax cable the signal is a radio wave travelling down the insulation and effectively bouncing off the centre conductor and the screen. The more fresh air in the insulation the better but there has to e enough solid material to keep the shape circular.

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