Common mode filter

A common mode filter comprising:

• a winding core part;
• and
• first and second wires wound in a same direction around the winding core part,
• wherein the first and second wires constitute a first winding block on one endmost side in an axial direction of the winding core part, a second winding block on another endmost side in the axial direction of the winding core part, and a third winding block positioned between the first and second winding blocks,
• wherein the first and second wires cross each other in a first area located between the first and third winding blocks and in a second area located between the second and third winding blocks,
• wherein the first and second wires do not cross each other between the first and second areas,
• wherein each of the first, second, and third winding blocks has a first winding layer positioned in a lower layer and a second winding layer positioned on an upper layer of the first winding layer,
• wherein the first and second wires are positioned in the first winding layer and second winding layer, respectively in the first and second winding blocks, and
• wherein the first and second wires are positioned in the second winding layer and first winding layer, respectively in the third winding block.

A common mode filter comprising:

• a winding core part;
• and
• first and second wires wound in a same direction around the winding core part,
• wherein the first and second wires constitute first, second, third, fourth, and fifth winding blocks arranged in an axial direction of the winding core part in this order,
• wherein the first and second wires cross each other in a first area located between the first and second winding blocks,
• wherein the first and second wires cross each other in a second area located between the second and third winding blocks,
• wherein the first and second wires cross each other in a third area located between the third and fourth winding blocks, and
• wherein the first and second wires cross each other in a fourth area located between the fourth and fifth winding blocks, and
• wherein a number of turns in the first winding block is different from a number of turns in the second winding block.