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RF shielding

Discussion in 'Electronic Basics' started by Chris W, Feb 17, 2008.

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  1. Chris W

    Chris W Guest

    I want to shield electronics in a plastic box from RF. My first thought
    was to get some copper foil tape with conductive adhesive and use that
    to line the inside of the box. Then I priced the copper foil tape with
    conductive adhesive, not cheap. I was wondering how much, if any, worse
    it would be to simply use aluminum foil tape with out conductive
    adhesive, which is much cheaper. Of course I would overlap each piece
    of tape but there would be no electrical connection.

    The RF I am concerned about is all less than 1Ghz, some as high as 930Mhz.

    Chris W

    "Protect your digital freedom and privacy, eliminate DRM,
    learn more at"

    Ham Radio Repeater Database.
  2. Phil Allison

    Phil Allison Guest

    "Chris W"
    ** Use tinplate.

    ** Use tinplate.

    ** Use tinplate.
    ** Use tinplate - it's cheap.

    ** Nice aluminium inductor you are winding ....

    ** So mobile phones are NOT an issue ?

    ......... Phil
  3. Chris W

    Chris W Guest

    Phil Allison wrote:

    No cell phones are not an issue.

    How is tinplate a good alternative to foil. The plastic has lots of
    complex curves which is why I planed to use foil which is easy to form
    around curves.

    Chris W

    "Protect your digital freedom and privacy, eliminate DRM,
    learn more at"

    Ham Radio Repeater Database.
  4. Phil Allison

    Phil Allison Guest

    "Chris Wanker "

    ** For use only on planet Mars - is it ?

    ** Ya can solder it.

    Makes a continuous and near perfect RF shield.

    ** Shield the PCB - you wanker.

    Forget caressing the damn plastic box.

    And fucking stop OVER SNIPPING !!!

    ........ Phil
  5. The problem with aluminum foil is that you really can't solder it, certainly
    not without a lot of work. And that makes for leaky seams.

    Get some very thin sheet metal, and fold it to fit in the box,
    soldering the corners. The sort of stuff you see used as shielding
    in commercial equipment. If you want to go cheap, cut up a tin can
    and use that to make an inner box, though watch out, the edges will
    be very sharp.

    Rethink things, and build in an aluminum box.

    Or, find some scrap piece of electronics and extract some shielded
    section from it to use inside your plastic box.

    Or, buy some scrap circuit board, and cut it to fit inside the
    plastic box, soldering the corners together. If you've got space,
    just make the box big enough to shield what you need, and use it
    as a sort of chassis inside the plastic box.

  6. I have a roll of 6 inch wide, 2 mil thick brass shim stock I
    use for this sort of thing. It solders very nicely.
  7. Joerg

    Joerg Guest

    There is also conductive paint that can even be sprayed but you'd have
    to price that out to see if within budget.
  8. Chuck

    Chuck Guest

    I agree with earlier posts suggesting that you shield the circuit,
    rather than the box.

    Larger hardware stores sell rolls of copper flashing that is only
    slightly thicker than HD aluminum foil, but has the advantage of
    solderability. Some of this flashing has a paper adhesive that can be
    easily removed. You might persuade some friends to contribute to the
    purchase of a roll, or get a couple of square feet from a contractor.

    All you need is a pair of scissors, a soldering iron, and a ruler and
    you can make a simple box or cylindrical shield.

  9. Jamie

    Jamie Guest

    conductive paint.
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