Patent ID: 7859357

Claim:
A non-reciprocal circuit device, comprising: permanent magnets; a ferrite to which a DC magnetic field is applied by the permanent magnets; a first center electrode and a second center electrode including a conductor film and being arranged on the ferrite so as to intersect each other while being electrically insulated from each other; and a planar yoke; wherein the ferrite and the permanent magnets define a ferrite-magnet assembly that is sandwiched by the permanent magnets from both sides in parallel or substantially in parallel with a surface on which the first and second center electrodes are provided; the planar yoke is adhered to an upper surface of the ferrite-magnet assembly through an adhesive layer; and a surface of the planar yoke that is adhered to the upper surface of the ferrite-magnet assembly is provided with an uneven portion that increases adhesive strength and facilitates flow of a high-frequency field generated from the first and second center electrodes.