A three-dimensional (3D) solenoid structure includes a first inductor portion having a first surface and a second surface opposite the first surface. The 3D solenoid structure further includes a first capacitor portion, a first inductor pillar, at least one capacitor pillar, a second inductor portion, a second inductor pillar and a first inductor bonding interface. The first inductor pillar is coupled to the first surface of the first inductor portion. The capacitor pillar(s) is coupled to the first capacitor portion. The second inductor portion includes a first surface and a second surface opposite the first surface. The second inductor pillar is coupled to the first surface of the second inductor portion. The first inductor bonding interface, between the first inductor pillar and the second inductor pillar, couples together the first inductor portion and the second inductor portion.

A filter for electromagnetic noise comprising: a printed circuit board (5) having conductor tracks, having a first side and having a second side opposite the first side; a first busbar (1), which is secured on the first side of the printed circuit board (5) and is electrically connected to at least one of the conductor tracks; and a second busbar (2), which is secured on the second side of the printed circuit board (5) and is electrically connected to at least one of the conductor tracks. The printed circuit board (5) is arranged between the first busbar (1) and the second busbar (2) for the insulation thereof.

A noise filter (A) includes a case (10) and capacitors (20) accommodated in the case (10). Substantially flat surfaces of the capacitors (20) serve as ground-side electrodes (23). A ground terminal (17) is connected directly to the ground-side electrodes (23), and input/output terminals (15) are connected to input/output-side electrodes (21) of the capacitors (20). A routing space for leads for connecting the capacitors (20) and the ground terminal (17) is not necessary in the case (10). Therefore, the case (10) can be miniaturized.

A filter component assembly kit includes a bobbin that is configured with first and second members and a core that is in a quadrangular frame shape. When the first member is assembled with the second member, a through hole is formed in the bobbin. The through hole extends in a first direction. The core is configured with first and second extension bars. The first and second extension bars extend in parallel in the first direction. When the first extension bar is disposed in the through hole of the bobbin, rotation of the core around the first extension bar is prevented. First allowance of the first extension bar in a second direction, which is perpendicular to the first direction, in the through hole is larger than second allowance of the first extension bar in a third direction, which is perpendicular to the first and second directions, in the through hole.

An inductor device, a filter device, and a steering system. The inductor device includes first to third cores and first and second wires. The first core, a portion of the first wire passing through the first core, and a portion of the second wire passing through the first core are provided as a first inductor. The second core and another portion of the first wire passing through the second core are provided as a second inductor. The third core and another portion of the second wire passing through the third core are provided as a third inductor.

An inductive-capacitive filter includes a first insulating-conductive strip wound around a winding axis, where the first insulating-conductive strip includes a first conductive strip joined with a first insulating strip. An inductive-capacitive filter assembly includes a first and a second insulating-conductive strip concentrically wound around a winding axis, the first insulating-conductive strip including a first conductive strip joined with a first insulating strip, and the second insulating-conductive strip including a second conductive strip joined with a second insulating strip.

An inductor according to an embodiment of the present invention comprises: a first magnetic body having a toroidal shape, and including a ferrite; and a second magnetic body disposed on an outer circumferential surface or an inner circumferential surface of the first magnetic body, wherein the second magnetic body includes: resin material and a plurality of layers of metal ribbons wound along the circumferential direction of the first magnetic body, wherein the resin material comprises a first resin material disposed to cover an outer surface of the plurality of layers of metal ribbons, and a second resin material disposed in at least a part of a plurality of layers of interlayer spaces.

A filter component assembly kit includes a bobbin that is configured with first and second members and a core that is in a quadrangular frame shape. When the first member is assembled with the second member, a through hole is formed in the bobbin. The through hole extends in a first direction. The core is configured with first and second extension bars. The first and second extension bars extend in parallel in the first direction. When the first extension bar is disposed in the through hole of the bobbin, rotation of the core around the first extension bar is prevented. First allowance of the first extension bar in a second direction, which is perpendicular to the first direction, in the through hole is larger than second allowance of the first extension bar in a third direction, which is perpendicular to the first and second directions, in the through hole.

A board-type noise filter having higher noise removal performance than that of a conventional noise filter, and an electronic device including the board-type noise filter are provided. The board-type noise filter includes: a printed wiring board having a wiring pattern formed thereon; a choke coil including a core having a toroidal shape; a frame ground portion fixed to the printed wiring board at a position overlapping with a hollow portion of the choke coil when the toroidal shape of the choke coil is seen in plan view, the frame ground portion being capable of being grounded to a frame ground; and a capacitor having a first terminal connected to the frame ground portion through the wiring pattern.

A three-dimensional (3D) solenoid structure includes a first inductor portion having a first surface and a second surface opposite the first surface. The 3D solenoid structure further includes a first capacitor portion, a first inductor pillar, at least one capacitor pillar, a second inductor portion, a second inductor pillar and a first inductor bonding interface. The first inductor pillar is coupled to the first surface of the first inductor portion. The capacitor pillar(s) is coupled to the first capacitor portion. The second inductor portion includes a first surface and a second surface opposite the first surface. The second inductor pillar is coupled to the first surface of the second inductor portion. The first inductor bonding interface, between the first inductor pillar and the second inductor pillar, couples together the first inductor portion and the second inductor portion.