Patent ID: 6373425
Filing Date: 2002-04-16
Classification: H01Q,H05K

Abstract:
A composite electromagnetic wave absorber comprising an assembly fabricated by bonding ferrite tiles and upper absorbers having a shape of a flat plate, a wedge shape or a pyramidal shape, wherein said upper absorber is prepared by dispersing ferrite powder in a general-purpose resin having a permittivity of not greater than 4.9 at a frequency of at least 1 MHz, wherein said ferrite tile comprises Fe2O3, NiO, ZnO and CuO as the principal components, said ferrite powder in said upper absorber comprises Fe2O3, NiO and ZnO as the principal components, and said general-purpose resin comprises at least one non-polar resin or resin approximate to said non-polar resin selected from the group consisting of polyethylene, polypropylene, a fluorocarbon resin, polytetrafluoroethylene, an allyl resin, an epoxy resin, a vinyl chloride resin, a vinyl acetate resin, a styrol resin, an acrylic resin, a polyamide resin, a polyacetal resin, a polycarbonate resin and an acetyl cellulose resin.