Patent ID: 8957744
Filing Date: 2015-02-17
Classification: H03H

Abstract:
1. A multilayer common mode filter comprising: an element body having a nonmagnetic section in which a plurality of nonmagnetic layers are laminated together; a first coil having first and second coil conductors of a spiral shape and configured in such a structure that the first coil conductor and the second coil conductor are connected by a first through-hole conductor; a second coil having third and fourth coil conductors of a spiral shape and configured in such a structure that the third coil conductor and the fourth coil conductor are connected by a second through-hole conductor; and a magnetic core section arranged in the nonmagnetic section so as to be located inside the first coil and the second coil when viewed from a laminated direction of the plurality of nonmagnetic layers, and comprised of a magnetic material, wherein the first coil and the second coil are arranged in the nonmagnetic section so that the first coil conductor and the third coil conductor are adjacent to each other in the laminated direction and so that the second coil conductor and the fourth coil conductor are adjacent to each other in the laminated direction, wherein a portion located inside the first coil and the second coil in the nonmagnetic section includes a first regional portion and a second regional portion adjacent to each other when viewed from the laminated direction, wherein the first through-hole conductor and the second through-hole conductor are located in the first regional portion so as to be adjacent to each other, when viewed from the laminated direction, and wherein the magnetic core section is located in the second regional portion when viewed from the laminated direction.