| 摘要 |
To provide a nonreciprocal circuit device which is compact and capable of obtaining a large attenuation in a specified frequency band without increasing the cost, and provided with at least a built-in inductor (Lf) for a filter, a nonreciprocal circuit constituted together with the nonreciprocal circuit device, and a communication device using the circuit, central conductors (51, 52, 53) are disposed in a ferrite (54) to which the DC magnetic field is applied in an intersecting manner with each other, matching capacitors (C1, C2, C3) are respectively connected between port sections (P1, P2, P3) of the central conductors (51, 52, 53) and a ground to constitute a nonreciprocal circuit, a solenoid-shaped inductor (Lf) is connected between the port section (P1) of the central conductor (51) and a signal input/output terminal (71), and the inductor (Lf) is disposed in a relationship so that the direction of the magnetic flux which is generated by this inductor (Lf) and passes through the ferrite (54) is substantially perpendicular to the direction of the DC magnetic field to the ferrite (54). <IMAGE> |
