A planar magnetic core is disposed in a DC magnetic field, and the top surface thereof is perpendicular to the direction of the DC magnetic field. Three central conductors are placed on the top surface of the magnetic core so that they overlap with each other at regular intervals substantially at the center of the top surface of the magnetic core. One end of each of the central conductors is used as an input/output terminal, and the other ends thereof are used as ground terminals. The inductance per unit length of the central conductor from the central portion to the ground terminal is set to be smaller than that from the central portion to the input/output terminal.
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