Accession Number : ADD004090

Title :   Magnetic Ceramic Absorber.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Wright, Rufus W

Report Date : 10 May 1977

Pagination or Media Count : 6

Abstract : A broadband microwave absorber is described comprising a sheet of magnetic ceramic material having the general formula, MOFe2O3, in which Fe2O3 is present in an amount in the range of between about 65 and 80 percent by weight of said material and in which MO represents bivalent metal oxides containing at least nickel oxide and zinc oxide, said nickel oxide being present in an amount of between about 3 and 12 percent by weight and said zinc oxide being present in an amount of between about 15 and 25 percent by weight, and including bivalent metal oxides selected from the group consisting of manganese oxide, calcium oxide and magnesium oxide, said manganese oxide being present in an amount of between about 0 and 10 percent by weight, said calcium oxide being present in an amount of between about 0 and 2 percent weight and said magnesium oxide being present in an amount of between about 0 and percent by weight, said sheet having a thickness which is substantially an electrical quarter wavelength at the lower range of microwave frequencies. (Author)

Descriptors :   *PATENTS, *ABSORBERS(MATERIALS), *FERRITES, *MICROWAVE EQUIPMENT, *CERAMIC MATERIALS, NICKEL COMPOUNDS, ZINC OXIDES, IRON OXIDES, OXIDES, MAGNETIC MATERIALS, ELECTROMAGNETIC RADIATION, BROADBAND

Subject Categories : Electricity and Magnetism
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE