APPLICATION OF AMORPHOUS FLAKE TO ELECTROMAGNETIC-INTERFERENCE (EMI) NOISE-FILTER

This paper describes the application of a Co-based amorphous alloy fla ke to a common-mode noise filter. Saturation magnetization and relativ e permeability are measured to be 7000 G and 1150, respectively. The a morphous flake exhibits high loss characteristics; the resistance of a 0.0065 cm(3) amorphous flake increases from 0.14 Omega at 1 MHz to 2. 2 Omega at 1 GHz as the frequency is increased. It is confirmed that a filter of 1/7 the volume of a conventional filter (ferrite core) exhi bits the same noise attenuation in the 10 MKz similar to 1 GHz frequen cy range.