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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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    I think a foil/screened cable could be considered a faraday cage provided the screen is full and of low resistivity.


    A coax cable may be considered as a screened cable again provided that the braid/foil is full enough at the frequencies of interest.  This will rely on good contact between the sides of the foil and /or braid wires within the screen at the frequencies of interest. 


    IIRC a coax cable is designed to keep the signal in the cable at the frequencies it is designed for and has specific impedance.  A screened cable is designed to keep external signals out and these may be at different frequencies and field strengths and will often have  non symmetrical field geometries (unlike as coax which is general cylindrical) and so require denser or thicker screens so they may not always be interchangable.

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    I think a foil/screened cable could be considered a faraday cage provided the screen is full and of low resistivity.


    A coax cable may be considered as a screened cable again provided that the braid/foil is full enough at the frequencies of interest.  This will rely on good contact between the sides of the foil and /or braid wires within the screen at the frequencies of interest. 


    IIRC a coax cable is designed to keep the signal in the cable at the frequencies it is designed for and has specific impedance.  A screened cable is designed to keep external signals out and these may be at different frequencies and field strengths and will often have  non symmetrical field geometries (unlike as coax which is general cylindrical) and so require denser or thicker screens so they may not always be interchangable.

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