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Shielding material and shielded room

  • US 4,890,083 A
  • Filed: 10/20/1988
  • Issued: 12/26/1989
  • Est. Priority Date: 10/20/1988
  • Status: Expired due to Term
First Claim
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1. A shield material for electromagnetic radiations comprising:

  • (a) a first layer of ferromagnetic material having opposing major surfaces and having a relatively high permeability over a first predetermined electromagnetic energy intensity range;

    (b) a second layer of ferromagnetic material having opposing major surfaces, one of said major surfaces being contiguous with one of the major surfaces of said first layer, said second layer having a relatively high permeability over a second predetermined electromagnetic energy intensity range different from said first range; and

    (c) a layer of highly electrically conductive material on the non-contiguous major surfaces of said first and second layers.

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