| 摘要 |
A high-frequency transmission line for common mode filtering is provided to effectively block external common mode noise by periodically changing even mode impedance while uniformly maintaining odd mode impedance. A high-frequency transmission line for common mode filtering includes at least two line conductors(20) and ground conductors(30a,30b). The line conductors are formed on one surface of a dielectric substrate(10) to be spaced from each other. The line conductors are extended in a high-frequency transmission direction. The ground conductors are formed on one surface of the dielectric substrate, where the line conductors are formed, and spaced apart from the line conductors. A stepped unit(30c) is formed on at least one of one side of the line conductor facing the ground conductor and one side of the ground conductor facing the line conductor so that a space between the line conductor and the ground conductor is divided into a narrow region(g') and a wide region(g) in the high-frequency transmission direction. |
