Patent ID: 6762656
Filing Date: 2004-07-13
Classification: H03H

Abstract:
An LC noise filter having a cutoff frequency comprising:at least two capacitor units including a hot-side capacitor pattern, ground-side capacitor patterns and a plurality of insulating layers which are stacked and integrated; and an inductor unit including a plurality of coil conductor patterns and a plurality of insulating layers which are stacked and integrated; wherein said at least two capacitor units are stacked above and below said inductor unit in a stacking direction; the hot-side capacitor pattern is arranged between the ground-side capacitor patterns; one of said plurality of coil conductor patterns is arranged adjacent to one of the ground-side capacitor patterns in the stacking direction with a distance d between said one of said plurality of coil conductor patterns and said one of the ground-side capacitor patterns; and the cutoff frequency is determined by the distance d; wherein the relative dielectric constant of the plurality of insulating layers is between about 50 and about 100; and the area of the ground-side capacitor pattern arranged adjacent to the inductor unit is larger than the area of the plurality of coil conductor patterns.