IRREVERSIBLE CIRCUIT ELEMENT

摘要

A nonreciprocal circuit device capable of improving an isolation characteristic without increase of insertion loss is attained. There is provided a nonreciprocal circuit device including a ferrite (32) to which DC magnetic fields are applied using permanent magnets and a first central electrode (35) and a second central electrode (36) which are arranged on the ferrite (32). One end of the first central electrode (35) is connected to an input port (P1) and the other end thereof is connected to an output port (P2). One end of the second central electrode (36) is connected to the output port (P2) and the other end thereof is connected to a ground port (P3). Between the input port (P1) and the output port (P2), a matching capacitor (C1) is connected along with a resistor (R1), and furthermore, an inductor (L3) and a capacitor (C3) included in an LC series resonance circuit which is connected to the resistor (R1) in series are connected.