Patent ID: 8354891

Claim:
A nonreciprocal circuit element comprising: a permanent magnet; a ferrite arranged to receive a direct-current magnetic field from the permanent magnet; first and a second center electrodes that intersect with but are isolated from each other; wherein the first center electrode is disposed on the ferrite, and includes a first end electrically connected to an input port and a second end electrically connected to an output port; the second center electrode is disposed on the ferrite, and includes a first end electrically connected to the output port and a second end electrically connected to a ground port; a first matching capacitor is electrically connected between the input port and the output port; a second matching capacitor is electrically connected between the output port and the ground port; a resistor electrically connected between the input port and the output port; a first parallel resonant circuit including an inductor and a capacitor is connected in parallel to the resistor; and a coupling element connecting the first parallel resonant circuit and a second parallel resonant circuit including the first center electrode and the first matching capacitor is electrically connected between the first and second parallel resonant circuits.