EP 0380267 B1 19931027 - Microwave absorber employing acicular magnetic metallic filaments.
Title (en)
Microwave absorber employing acicular magnetic metallic filaments.
Title (de)
Mikrowellen-Absorbermaterial, das nadelförmige magnetische Metallfasern enthält.
Title (fr)
Matériau absorbant les micro-ondes contenant des filaments aciculaires métalliques et magnétiques.
Publication
Application
Priority
US 30242789 A 19890126
Abstract (en)
[origin: EP0380267A1] An electromagnetic radiation absorber is formed by dispersing into a dielectric binder acicular magnetic metallic filaments with an average length of about 10 mu m or less, diameters of 0.1 mu m or more, and aspect (length/diameter) ratios between 10:1 and 50:1. Preferably the average length is about 5 mu m, the aspect ratios are between 10:1 and 25:1, and the dielectric binder is polymeric. The volume fraction of the filaments may be lower than 35% of the total and still provide satisfactory absorption. An absorbing paint is formed by dissolving the absorber in a base liquid. The absorber or absorbing paint may be applied to a conductive surface, such as a metallic wire, plate or foil. Impedance matching materials are preferred but not required.
IPC 1-7
IPC 8 full level
B32B 7/02 (2006.01); H01Q 17/00 (2006.01); H05K 9/00 (2006.01)
CPC (source: EP)
H01Q 17/005 (2013.01)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0380267 A1 19900801; EP 0380267 B1 19931027; AU 4708889 A 19900802; AU 615817 B2 19911010; CA 2005198 A1 19900726; DE 69004109 D1 19931202; DE 69004109 T2 19940511; JP H02235396 A 19900918
DOCDB simple family (application)
EP 90300632 A 19900122; AU 4708889 A 19891221; CA 2005198 A 19891212; DE 69004109 T 19900122; JP 1592890 A 19900125