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Electromagnetic shielding and wave absorption sheet and the production of the same

  • US 6,136,429 A
  • Filed: 03/06/1998
  • Issued: 10/24/2000
  • Est. Priority Date: 03/14/1997
  • Status: Expired due to Fees
First Claim
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1. A shielding sheet made by embedding soft magnetic metal or alloy powder within a pliable insulating layer whereby said pliable insulating layer contains powder embedded therein;

  • said powder being distributed within said pliable insulating layer to thereby form at least one powder layer component containing a first concentration of metal or alloy powder distributed therein, and a remaining portion of said pliable insulating layer which contains a second concentration of metal or alloy powder distributed therein;

    with the proviso that the second concentration of metal or alloy powder is either zero or is present at a lesser concentration than said first concentration; and

    with the proviso that said at least one powder layer component extends either;

    1) along at least one surface of the insulating layer; and

    /or2) within said insulating layer;

    said metal or alloy powder being in the form of particles having an average diameter of less than or equal to 100 μ

    m.

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