Patent ID: 7253713

Claim:
A common-mode choke coil comprising: first and second coil parts magnetically coupled to each other; a first inductance part electrically connected in series to the first coil part; and a second inductance part electrically connected in series to the second coil part, wherein the first inductance part is not substantially magnetically coupled to the first and second coil parts, and a coupling factor between the first inductance part and the first coil part and a coupling factor between the first inductance part and the second coil part are not more than 0.1; the second inductance part is not substantially magnetically coupled to the first and second coil parts, and a coupling factor between the second inductance part and the first coil part and a coupling factor between the second inductance part and the second coil part are not more than 0.1; and the first inductance part and the second inductance part are not substantially magnetically coupled to each other, and a coupling factor between the first inductance part and the second inductance part is not more than 0.1.