Abstract: A nonreciprocal circuit element having low insertion loss is provided. In the circuit element, three central conductors are disposed such that they intersect each other at specified angles in an electrically isolated condition and a DC bias magnetic field is applied to the intersection. The intersection angles formed by the central conductors are set to different values, corresponding to the rotation angle of the high-frequency magnetic field caused by the DC bias magnetic field. A stronger operating DC magnetic field than that in a conventional circuit element is used to reduce a ferrite loss.

Abstract: A nonreciprocal circuit element including a ferrite assembly which ha a pair of ferrite members and a plurality of central conductors interposed between the ferrite members, and a dielectric substrate which has an earthing electrode formed on one of its faces and a plurality of impedance matching electrodes formed on the other face, and wherein a direct current magnetic field is applied to the ferrite members. The ferrite assembly and the dielectric substrate are stacked such that lead-out portions of the central conductors are, respectively, connected to the impedance matching electrodes, while earthing portions of the central conductors and the earthing electrode are grounded.