|発明の名称||COMMON MODE FILTER|
PROBLEM TO BE SOLVED: To provide a highly integrated common mode filter capable of obtaining a filter characteristic for practical use.
SOLUTION: The common mode filter for use in a transmission circuit, which propagates differential signals on a first transmission line and a second transmission line to transmit a signal, includes a pair of inductors 11, 21 and a plurality of capacitors. The inductors are formed in an arrangement of being mutually magnetically coupled. The common mode filter includes: a first layer having a formed conductor pattern to be the capacitor; a third layer having a formed conductor pattern to be the capacitor and the inductor; and a second layer composed of a dielectric material sandwiched by the first layer and the third layer in the thickness direction. The capacitor is constituted by the conductor patterns disposed to face each other across the second layer.
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