Patent ID: 7915971

Claim:
A nonreciprocal circuit device comprising: a ferrite-magnet element including a ferrite having two primary surfaces on which central electrodes are arranged to intersect each other in an electrically insulated manner and a pair of permanent magnets disposed on the two primary surfaces of the ferrite so as to apply a direct current magnetic field to the ferrite; a substrate having a surface to which the ferrite-magnet element is bonded so that the two primary surfaces of the ferrite are perpendicular or substantially perpendicular to the surface of the substrate; a flat plate yoke arranged to cover a top surface of the ferrite-magnet element; a first resin layer arranged at least at a bonding portion of the ferrite-magnet element bonded to the substrate, the first resin layer including a cured liquid resin; and a second resin layer adhered to a rear surface of the flat plate yoke, the second resin layer including a cured soft sheet-shaped resin; wherein the ferrite-magnet element is completely sealed from outside by the first and second resin layers.