Patent ID: 8947175
Filing Date: 2015-02-03
Classification: H03H

Abstract:
1. A low-pass filter comprising: a laminate that includes a plurality of insulating layers stacked in a stacking direction, a first side in the stacking direction, a second side in the stacking direction opposite to the first side, and a mounting surface on the first side in the stacking direction; a first external electrode disposed on a surface of the laminate; a first coil that is incorporated in the laminate, has a spiral or substantially spiral shape having a central axis thereof extending in the stacking direction, and includes a first end thereof disposed closer to the first side of the laminate than to the second side and a second end thereof disposed closer to the second side of the laminate than to the first side; a second coil that is incorporated in the laminate, has a spiral or substantially spiral shape having a central axis thereof extending in the stacking direction, and includes a first end thereof disposed closer to the first side of the laminate than to the second side and a second end thereof disposed closer to the second side of the laminate than to the first side; a first via-hole conductor that extends from the second end of the first coil toward the first side in the stacking direction; and a second via-hole conductor that extends from the second end of the second coil toward the first side in the stacking direction; wherein the first external electrode and the second end of the first coil are electrically coupled to each other through the first via-hole conductor; the first external electrode and the second end of the second coil are electrically coupled to each other through the second via-hole conductor; and the first coil is wound in a counterclockwise direction and the second coil is wound in a clockwise direction.