Patent ID: 7605677

Claim:
A noise filter comprising: a base member; a signal-line lead; a ground lead; a first substantially cylindrical ferrite bead in which an input-side of the signal-line lead is inserted; a second substantially cylindrical ferrite bead in which an output-side of the signal-line lead is inserted; a feedthrough capacitor in which the signal-line lead is inserted, the feedthrough capacitor being adjacent to an output side of the second substantially cylindrical ferrite bead; a capacitor electrically coupled between the signal-line lead and the ground lead, the capacitor being adjacent to an input side of one of the first and second substantially cylindrical ferrite beads; and a ground plate electrically coupled to the ground lead, the capacitor, and the feedthrough capacitor; wherein each of the signal-line lead and the ground lead has a substantially circular cross-section; the base member includes depressions arranged to accommodate each of the first and second substantially cylindrical ferrite beads and the feedthrough capacitor, a depth of each of the depressions is set so that, in an accommodated state, an axis of a through hole of each of the first and second substantially cylindrical ferrite beads and an axis of a through hole of the feedthrough capacitor are oriented coplanar to each other above the base member; and each of an end of the signal-line lead and an end of the ground lead is flat, bent along an outer surface of the base member, and defines an external terminal that projects beyond a bottom of the base member.