Common mode filter, signal passing module and method of manufacturing common mode filter

A common mode filter comprising:

• a first coil layer having a first primary coil and a first secondary coil provided in a spiral shape on a single plane surface to be spaced apart from each other by a preset distance;
• a first primary external terminal formed on the first coil layer and provided to one end of the first primary coil;
• a first primary internal terminal formed on the first coil layer and provided to the other end of the first primary coil;
• a first secondary external terminal formed on the first coil layer and provided to one end of the first secondary coil;
• a first secondary internal terminal formed on the first coil layer and provided to the other end of the first secondary coil;
• a second coil layer having a second primary coil and a second secondary coil provided in a spiral shape on a single plane surface to be spaced apart from each other by a preset distance;
• a second primary external terminal formed on the second coil layer and provided to one end of the second primary coil;
• a second primary internal terminal formed on the second coil layer and provided to the other end of the second primary coil;
• a second secondary external terminal formed on the second coil layer and provided to one end of the second secondary coil;
• a second secondary internal terminal formed on the second coil layer and provided to the other end of the second secondary coil;
• a third coil layer having a third primary coil and a third secondary coil provided in a spiral shape on a single plane surface to be spaced apart from each other by a preset distance;
• a third primary external terminal formed on the third coil layer and provided to one end of the third primary coil;
• a third primary internal terminal formed on the third coil layer and provided to the other end of the third primary coil;
• a third secondary external terminal formed on the third coil layer and provided to one end of the third secondary coil;
• a third secondary internal terminal formed on the third coil layer and provided to the other end of the third secondary coil;
• a fourth coil layer having a fourth primary coil and a fourth secondary coil provided in a spiral shape on a single plane surface to be spaced apart from each other by a preset distance;
• a fourth primary external terminal formed on the fourth coil layer and provided to one end of the fourth primary coil;
• a fourth primary internal terminal formed on the fourth coil layer and provided to the other end of the fourth primary coil;
• a fourth secondary external terminal formed on the fourth coil layer and provided to one end of the fourth secondary coil;
• and
• a fourth secondary internal terminal formed on the fourth coil layer and provided to the other end of the fourth secondary coil,
• wherein the first coil layer, the second coil layer, the third coil layer, and the fourth coil layer are sequentially stacked,
• the first primary internal terminal is in contact with the second primary internal terminal directly or through a via,
• the second primary external terminal is in contact with the third primary external terminal directly or through a via,
• the third primary internal terminal is in contact with the fourth primary internal terminal directly or through a via, and
• a first discontinuous part made of an insulting material is provided between the third primary external terminal and the fourth primary external terminal.

A method of manufacturing a common mode filter, the method comprising:

• forming a first coil layer including a first primary coil having one end connected to a first primary external terminal and the other end connected to a first primary internal terminal and a first secondary coil having one end connected to a first secondary external terminal and the other end connected to a first secondary internal terminal;
• forming, on the first coil layer, a second coil layer including a second primary coil having one end connected to a second primary external terminal and the other end connected to a second primary internal terminal and a second secondary coil having one end connected to a second secondary external terminal and the other end connected to a second secondary internal terminal;
• forming, on the second coil layer, a third coil layer including a third primary coil having one end connected to a third primary external terminal and the other end connected to a third primary internal terminal and a third secondary coil having one end connected to a third secondary external terminal and the other end connected to a third secondary internal terminal;
• and
• forming, on the third coil layer, a fourth coil layer including a fourth primary coil having one end connected to a fourth primary external terminal and the other end connected to a fourth primary internal terminal and a fourth secondary coil having one end connected to a fourth secondary external terminal and the other end connected to a fourth secondary internal terminal,
• wherein a first discontinuous part made of an insulting material is provided between an upper surface of the third primary external terminal and a lower surface of the fourth primary external terminal, and
• a second discontinuous part made of an insulting material is provided between an upper surface of the third secondary external terminal and a lower surface of the fourth secondary external terminal.

A common mode filter comprising:

• an insulation part;
• and
• at least four coil layers sequentially stacked in the insulation part, each having a primary coil and a secondary coil, the primary coil and the secondary coil having a spiral shape, and being spaced apart from each other,
• wherein the primary coils of the at least four coil layers are connected in series and the secondary coils of the at least four coil layers are connected in series.