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EMF Shielding

  1. Oct 31, 2007 #1
    Your opinion to the following will be appreciated

    Lets imagine a sphere made of a conductor (copper) placed within a
    static magnetic field. The field will penetrate the within the shier.
    Next we place inside the sphere a coil producing a variable
    electromagnetic field. The electromagnetic field can not escape out
    side the sphere due to shielding effect of the cooper sphere.

    The question is: Taking in consideration the shielding effect created
    by the variable electromagnetic field within the shier, can the static
    magnetic field penetrate within the shier?
     
  2. jcsd
  3. Nov 2, 2007 #2
    On Wed, 31 Oct 2007 05:51:35 +0000 (UTC), Efthimios
    <eangelopoulos@gmail.com> wrote:

    >Your opinion to the following will be appreciated
    >
    >Lets imagine a sphere made of a conductor (copper) placed within a
    >static magnetic field. The field will penetrate the within the shier.
    >Next we place inside the sphere a coil producing a variable
    >electromagnetic field. The electromagnetic field can not escape out
    >side the sphere due to shielding effect of the cooper sphere.


    A static magnetic field will remain unaffected.

    For the variable em field the shielding effectiveness is limited.
    There will be a certain amount of leaking through the shield,
    dependent on frequency, wall thickness, conductivity, and so on.
    We usually calculate damping factors in deziBel values, "dB".

    >
    >The question is: Taking in consideration the shielding effect created
    >by the variable electromagnetic field within the shier, can the static
    >magnetic field penetrate within the shier?


    Yes, the two fields do not affect each other.
    We cannot shield a static magnetic field by applying
    a high-frequency radiation to the shield.

    w.
     
  4. Dec 20, 2007 #3
    Solve your problem

    If you want to solve your EM problem you can take a look in here.

    You can request a catalog and a sample package for free, and buy EM materials if needed.
     
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