Abstract: Disclosed herein is a coil component that includes an element body made of a first magnetic material, a coil conductor embedded in the element body, and first and second magnetic films made of a second magnetic material having higher permeability than that of the first magnetic material. The element body has an upper surface crossing a coil axis of the coil conductor and first and second side surfaces extending substantially parallel to the coil axis. The first magnetic film is formed on the upper surface and first side surface of the element body, and the second magnetic film is formed on the upper surface and second side surface of the element body.

Abstract: Disclosed herein is a coil component that includes a first coil part spirally wound in a plurality of turns, the first coil part including a first turn positioned at an innermost periphery and a second turn positioned on an outer peripheral side relative to the first turn; and a second coil part spirally wound in a plurality of turns, the second coil part including a third turn positioned at an innermost periphery and a fourth turn positioned on an outer peripheral side relative to the third turn. The first turn and the fourth turn are connected to each other, and the second turn and the third turn are connected to each other.

Abstract: An antenna device is provided with a substrate; an antenna coil formed into a loop-shaped or spiral-shaped on the substrate; a first metallic layer overlapping with a first part of the antenna coil in a planar view; and a second metallic layer overlapping with a second part of the antenna coil different from the first part. The first and second metallic layers are disposed on both sides of a center of an inner diameter portion of the antenna coil in a planar view, respectively. A slit formed between the first and second metallic layers overlaps with the inner diameter portion of the antenna coil in a planar view. At least one of the first and second metallic layers is formed on the substrate together with the antenna coil.

Abstract: Disclosed herein is a coil component that includes an insulating substrate, a first coil part formed on the first surface of the insulating substrate, and a second coil part formed on the second surface of the insulating substrate. At least an innermost turn of the first coil part is radially separated by spiral-shaped slits into three or more conductor parts. At least an innermost turn of the second coil part is radially separated by spiral-shaped slits into three or more conductor parts. Inner peripheral ends of respective innermost to outermost conductor parts of the three or more conductor parts of the first coil part are connected to inner peripheral ends of the respective outermost to innermost conductor parts of the three or more conductor parts of the second coil part.

Abstract: Disclosed herein is an electronic circuit module that includes a circuit board and a common mode filter mounted on the circuit board. The common mode filter includes first and second terminal electrodes constituting a first pair of terminal electrodes and third and fourth electrodes constituting a second pair of terminal electrodes. The circuit board includes: a first wiring layer having first, second, third, and fourth land patterns connected to the first, second, third, and fourth terminal electrodes, respectively, and first, second, third, and fourth wiring patterns connected to the first, second, third, and fourth land patterns, respectively; and a second wiring layer having a ground pattern that overlaps the first, second, third, and fourth wiring patterns without overlapping the first and second land patterns.

Abstract: Disclosed herein is a coil component that includes a substrate having a first surface and a first spiral coil spirally wound in a plurality of turns formed on the first surface of the substrate. Each of the turns has a first circumference region in which a radial position is substantially fixed and a first shift region in which a radial position is shifted. Each of inner and outer peripheral ends of the first spiral coil is positioned at the first shift region.

Abstract: Disclosed herein is a common mode filter that includes first and second terminal electrodes provided on the first flange part, third and fourth terminal electrodes provided on the second flange part, a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode, and a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode. The winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction. The first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.

Abstract: Disclosed herein is a common mode filter that includes first and second terminal electrodes provided on the first flange part, third and fourth terminal electrodes provided on the second flange part, a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode, and a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode. The winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction. The first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.

Abstract: A coil device includes a winding core with a coil portion wound by a wire and a pair of flanges respectively formed on both sides of the winding core in an axial direction. The coil portion includes a bank winding portion with double layer constituted by the wire wound around an outer circumference of the winding core and a layer winding portion with single layer constituted by the wire wound closely and adjacently to the bank winding portion along the axial direction of the winding core.

Abstract: Disclosed herein is antenna device that includes: a first metal member having a first main surface; a second metal member having a second main surface parallel to the first main surface; and an antenna coil having a coil axis perpendicular to the first and second main surfaces, wherein the first metal member constitutes at least a part of a housing of a portable electronic device in which the antenna coil is mounted, at least one slit is formed between the first and second metal members, an inner diameter section of the antenna coil overlaps with the slit in planar view, and the slit has a constant width at least in a region that overlaps with the antenna coil in planar view.

Abstract: Disclosed herein is a coil component that includes a coil conductor part, and first and second high permeability parts provided respectively on both sides of the coil conductor part in a coil axis direction. The second high permeability part has a larger thickness in the coil axis direction than the first high permeability part. A low permeability part that segments at least a part of a magnetic path exists between the first and second high permeability parts in an outer diameter area of the coil conductor part when viewed in the coil axis direction.

Abstract: Disclosed herein is a pulse transformer that includes: a drum core including a winding core part and first and second flange parts provided at both ends of the winding core part in an axial direction; a plurality of wires wound around the winding core part; and a plate-like core fixed to the drum core so as to face a first surface of the first flange part that is parallel to the axial direction and a second surface of the second flange part that is parallel to the axial direction. A value of S1/S2 is 0.19 or more and 0.47 or less, where an area of the cross section of the winding core part that is perpendicular to the axial direction is S1 and a facing area between the plate-like core and the first or second surface is S2.

Abstract: Disclosed herein is a coil component that includes first and second coil parts each spirally wound in a plurality of turns in directions opposite to each other. An innermost turn of the first coil part is radially divided into first and second conductor parts by a spiral slit, and at least an innermost turn of the second coil part is radially divided into third and fourth conductor parts by a spiral slit. The first conductor part is positioned radially inward of the second conductor part, and the third conductor part is positioned radially inward of the fourth conductor part. The inner peripheral end of the first conductor part is connected to the inner peripheral end of the fourth conductor part, and the inner peripheral end of the second conductor part is connected to the inner peripheral end of the third conductor part.

Abstract: A magnetism suppressing sheet is provided with a metallic foil formed by plating and a magnetic film formed by applying magnetic metal powder-containing resin paste to one main surface of the metallic foil. A manufacturing method of a magnetism suppressing sheet includes the steps of preparing a support film on which a metallic foil has been formed, and forming a magnetic film by applying a magnetic metal powder-containing paste to one main surface of the metallic foil.

Abstract: A common mode filter includes a core, and first and second wires wound around the core. Each of the first and second wires includes at least i?1th turn, ith turn, and i+1th turn. The ith turn of the first wire intersects with the ith turn of the second wire without intersecting each of the i?1th and i+1th turns of the second wire.