A common-mode noise filter is provided, and comprises a first transmission structure and a second transmission structure. At least one first transmission unit is connected between a first signal input end and a first signal output end of the first transmission structure in series. At least one second transmission unit is connected between a second signal input end and a second signal output end of the second transmission structure in series. Two first capacitors are connected between the first signal input end and the second signal input end in series, and connected at a first node together. A first common-mode noise suppression unit is connected between the first node and a reference potential, and comprises a second capacitor and a first lossy element connected to the second capacitor in series or parallel. The first common-mode noise suppression unit can absorb a common-mode noise via the first lossy element.

A common mode noise filter includes a first coil and a second coil. The first coil is formed in a plurality of insulating layers and includes a spiral first coil conductor and a spiral second coil conductor. The second coil is formed in the plurality of insulating layers and includes a spiral third coil conductor and a spiral fourth coil conductor. The first and third coil conductors are magnetically coupled to form a first common mode filter unit, and the second and fourth coil conductors are magnetically coupled to form a second common mode filter unit. As viewed from above, a first direction in which currents flow through the first and third coil conductors in the first common mode filter unit is opposite to a second direction in which currents flow through the second and fourth coil conductors in the second common mode filter unit.

A noise filter includes: a first bus bar that is electrical wiring of a flat plate, the first bus bar including a first extending wiring portion extending in a first direction, a second extending wiring portion extending in a second direction that is a direction opposite to the first direction, and a first coupling wiring portion connecting the first extending wiring portion and the second extending wiring portion; a first lead conductor having a first end connected with the first coupling wiring portion; a first capacitor having a first end connected with a second end of the first lead conductor and a second end connected with a ground; and a magnetic core having an opening in a central portion, the magnetic core disposed in such a manner that the first coupling wiring portion passes through the opening.

A common mode filter includes a body portion including a plurality of external electrodes disposed externally on the body portion, a first filter portion disposed within the body portion and including a plurality of coil electrode layers, and a second filter portion disposed within the body portion and including a plurality of coil electrode layers. The first filter portion and the second filter portion are connected to each other in series, and an area of the plurality of coil electrode layers of the first filter portion and an area of the plurality of coil electrode layers of the second filter portion are different from each other.

A common mode filter includes: a body disposed on a substrate, wherein the body includes: a coil part including one or more coils and a through-hole formed in a central portion thereof; and a core part including a magnetic powder, disposed on the coil part, and filling the through-hole. A content of the magnetic powder in the core part has a gradient in a stacking direction. Impedance characteristics may be improved by reducing unfilled defect in the core part and securing permeability thereof at the same time.

An electronic component includes a first inductor which is provided on a first direction side relative to a first main surface, which includes one or more first inductor conductive layers having substantially a spiral shape when viewed from the first direction side, and which includes a first end portion and a second end portion; a first outer electrode and a second outer electrode provided on a surface different from the first main surface of a substrate; and a first surface mounted electronic component which is provided on the first direction side relative to the first inductor, which overlaps the first inductor when viewed from the first direction side, and which includes a third outer electrode and a fourth outer electrode.

Disclosed are a line filter and a power supply apparatus including the line filter. The line filter includes a first inductor having a first coil wound around a first bobbin; and a second inductor having a second coil wound around a second bobbin, the second inductor being induced by the first inductor to flow current, wherein the first bobbin and the second bobbin are physically separated from each other. The power supply apparatus includes such a line filter.

The invention is directed towards a power source interface module for electronic circuits supplied by power from a power source as well as a power supply arrangement for electronic circuits comprising such a power source interface module. The module comprises a first circuit board carrying components, the first circuit board comprising a number of stacked circuit board layers as well as at least two openings, at least a part of a filter comprising at least one pair of magnetically coupled inductive coils, a core with two core legs, each core leg stretching through a corresponding opening in the circuit board, wherein each coil is wound around a corresponding core leg, the turns of the coils stretch through the circuit board layers, and each layer between an upper outer layer and a lower outer layer comprises at least a part of one turn.

In a common mode noise filter, first coil (12) includes first coil conductor (16) and second coil conductor (17) with spiral shapes. Second coil (13) includes third coil conductor (18) and fourth coil conductor (19) with spiral shapes. First coil conductor (16), third coil conductor (18), second coil conductor (17), and fourth coil conductor (19) are placed in this order from above. First metal layer (14) configured to be connected to a ground is provided above first coil conductor (16).

A common mode filter includes a body portion including an external electrode disposed outwardly of the body portion, a plurality of coil electrode layers disposed within the body portion and electrically connected to the external electrode, and a shunt electrode layer disposed between portions of the plurality of coil electrode layers and having a coil shape.