Patent ID: 7161446
Filing Date: 2007-01-09
Classification: H01F,H03H

Abstract:
1. A noise filter comprising: a laminate body including magnetic layers, dielectric layers, line conductors, and ground conductors, wherein each of the line conductors is disposed in one of a plurality of interfaces between the magnetic layers and each of the ground conductors is disposed directly between one of a plurality of interfaces between the dielectric layers such that one line conductor alternates with one ground conductor in lamination, with one ground conductor arranged on a top dielectric layer and another ground conductor arranged on a bottom dielectric layer, and the line conductors disposed between the magnetic layers being serially connected; wherein; the magnetic layers are made of a magnetic oxide and cause little or no attenuation of an electrical signal within a frequency range below a frequency at which a magnetic loss occurs and attenuates an electrical signal within a frequency range where the magnetic loss; and each of the ground conductors is sandwiched by and in direct contact with a respective pair of the dielectric layers.