Patent ID: 7138883

Claim:
A non-reciprocal circuit element comprising: a first yoke having an upper plate; a magnet disposed on a lower surface of the upper plate; a second yoke which has a flat plate-shaped lower plate and which forms a magnetic closed circuit together with the first yoke; a flat plate-shaped ferrite member disposed on the lower plate; a flat plate-shaped dielectric disposed on the ferrite member between the magnet and the ferrite member and which is made of a laminated plate having a plurality of laminated insulating thin plates; first to third central conductors which are formed at different laminated locations of the dielectric and which are disposed in a manner that parts of the first to third central conductors cross each other in a vertical direction; and a plurality of capacitors each having first and second electrodes opposite to each other with an insulating body interposed therebetween, wherein the capacitors are disposed on a bottom surface of the dielectric facing the ferrite member in a state in which the first electrodes are connected to port portions serving as one end of the central conductors, and the second electrodes of the capacitors and ground portions serving as the other ends of the central conductors are connected to a ground plate composed of one sheet of metal plate and the ground plate is connected to the lower plate of the second yoke.