Common mode noise filter

A common mode noise filter comprising:

• a first magnetic section and a second magnetic section, the first magnetic section having a plurality of layers containing a first magnetic material, the plurality of layers having a bottom layer, and the second magnetic section having a layer containing the first magnetic material;
• a non-magnetic section having a layer containing a non-magnetic material;
• two coils disposed inside the non-magnetic section;
• a first metal layer disposed on the bottom layer of the first magnetic section and a second metal layer disposed inside the second magnetic section, the first and second metal layers being grounded;
• and
• a magnetic core section containing a second magnetic material, wherein:
• the non-magnetic section is disposed between the first and second magnetic sections in a stacking direction of stacking the first and second magnetic sections and the non-magnetic section,
• each of the two coils includes a central section and a conductive wire wound in a plane around the central section,
• the plane of each of the two coils is disposed along the layer containing the non-magnetic material,
• the two coils face each other,
• the first magnetic section has a first interface to the non-magnetic section and a first surface opposite to the first interface in the stacking direction and the second magnetic section has a second interface to the non-magnetic section and a second surface opposite to the second interface in the stacking direction,
• the first metal layer is disposed closer to the first surface than the first interface,
• the magnetic core section is present inside the two coils and does not overlap the first and second metal layers in a top view,
• a bottom of the magnetic core section is embedded in and in direct contact with one of the first or second magnetic sections, and a top of the magnetic core section is in direct contact with another of the first or second magnetic sections,
• the bottom layer of the first magnetic section is disposed opposed to the non-magnetic section,
• the bottom of the magnetic core section is disposed on the bottom layer of the first magnetic section,
• the first metal layer surrounds the magnetic core section at the bottom layer of the first magnetic section in the top view, and
• the second metal layer surrounds the magnetic core section in the top view.