APPLICATION OF CO-BASED AMORPHOUS RIBBON TO A NOISE-FILTER AND A SHIELDED CABLE

This paper describes the application of a Co-based amorphous alloy rib bon to a common-mode noise filter in the 1 MHz-1 GHz frequency range. Its saturation magnetization, and relative permeability were 6000 G an d 1450, respectively. The 10-mu m-thick amorphous ribbon exhibits high loss characteristics. The resistance of a 2-mm-diam roll of amorphous ribbon (12.5 mm wide and 30 cm long) increases from 3 Omega at 1 MHz to 50 Omega at 350 MHz. It is confirmed that a filter 1/17th the volum e of a conventional (ferrite core) filter exhibits the same noise atte nuation. Moreover, the noise emission from a twisted pair cable is gre atly reduced without any increase in the cable volume by employing the amorphous ribbon as a shielding material. (C) 1996 American Institute of Physics.