Low-pass filter
AssigneeMurata Manufacturing Co., Ltd.
InventorHiroyuki Sasaki
Life of this patent
Estimating the term…
Abstract
A low pass filter includes a laminate including a plurality of insulating layers stacked in a z-axis direction and a mounting surface on a negative side in the z-axis direction. An external electrode is disposed on a lower surface of the laminate and is grounded. The laminate houses a substantially spiral coil having a central axis extending in the z-axis direction. Via-hole conductors extend from the end on the positive side in the z-axis direction of the coil toward the negative side in the z-axis direction. The external electrode and the end on the positive side in the z-axis direction of the coil are electrically coupled to each other through the via-hole conductors.
Claims4
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.
Dependencies are inferred from the claim text.