Patent ID: 6816027
Filing Date: 2004-11-09
Classification: H01P

Abstract:
A three-port nonreciprocal circuit device, comprising:a ferrite element; a permanent magnet for applying a direct-current magnetic field to the ferrite element; a first center electrode arranged at a major surface of the ferrite element or in the ferrite element, one end of the first center electrode being electrically connected to a first port; a second center electrode arranged at the major surface of the ferrite element or in the ferrite element so as to cross the first center electrode in an electrically insulated state, one end of the second center electrode being electrically connected to a second port; a third center electrode arranged at the major surface of the ferrite element or in the ferrite element so as to cross the first center electrode and the second center electrode in an electrically insulated state, one end of the third center electrode being electrically connected to a third port; at least one matching capacitor constituting at least one LC parallel resonator circuit in conjunction with one of the first, second, and third center electrodes; and at least one series inductor electrically connected between at least one of the at least one LC parallel resonator circuit and ground; wherein the other end of at least one of the first, second, and third center electrodes is not connected to a common potential and does not share a common end with the other end of a different center electrode.