(19)
(11) EP 0 479 438 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.10.1992 Bulletin 1992/42

(43) Date of publication A2:
08.04.1992 Bulletin 1992/15

(21) Application number: 91308300.2

(22) Date of filing: 11.09.1991
(51) International Patent Classification (IPC)5: H01Q 17/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 02.10.1990 US 591799

(71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY
St. Paul, Minnesota 55133-3427 (US)

(72) Inventors:
  • Chamberlain, Craig S., c/o Minnesota Mining and
    St. Paul, Minnesota 55133-3427 (US)
  • Connell, Glen, c/o Minnesota Mining and
    St. Paul, Minnesota 55133-3427 (US)
  • Tait, William C., c/o Minnesota Mining and
    St. Paul, Minnesota 55133-3427 (US)

(74) Representative: Baillie, Iain Cameron et al
c/o Ladas & Parry 52-54 High Holborn
London WC1V 6RR
London WC1V 6RR (GB)


(56) References cited: : 
   
       


    (54) Electromagnetic radiation absorbing material employing doubly layered particles


    (57) An electromagnetic radiation absorbing material (12) comprises doubly layered core particles (11) dispersed in a dielectric binder material (14). The first layer (15) dissipates radiation; the second layer (17) is an insulating material which helps prevent the particles (11) from conductively contacting each other, and prevents degradation of the first layer (15). The absorber may be applied to an electrically conductive material (18), and an impedance matching material (16) may be used.






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