US 7,541,909 B2
	Filter circuit having an Fe-based core
Ryusuke Hasegawa, Morristown, N.J. (US); Ronald J. Martis, East Hanover, N.J. (US); and Seshu V. Tatikola, Bridgewater, N.J. (US)
Assigned to Metglas, Inc., Conway, S.C. (US)
Filed on Feb. 08, 2002, as Appl. No. 10/71,368.
Prior Publication US 2003/0151487 A1, Aug. 14, 2003
This patent is subject to a terminal disclaimer.
Int. Cl. H01F 27/24 (2006.01)

U.S. Cl. 336—233

6 Claims

1. A bandpass filter, comprising an inductor having a non-gapped core that consists essentially of an Fe—B—Si amorphous alloy ribbon with Fe content in a vicinity of 80 atomic percent and having a crystallization temperature ranging from 500° C. to 530° C. and heat-treated below the alloy's crystallization temperature, a linear BH loop and a constant permeability ranging from 400 to 1000 over a frequency range of about 1 to 1000 kHz, wherein the permeability is linear up to an induction level of 13 kG.