Patent ID: 7239214

Claim:
A two-port non-reciprocal circuit device comprising: a permanent magnet; a ferrite to which a direct-current magnetic field is applied by the permanent magnet; a first central electrode provided on the ferrite, one end of the first central electrode being electrically connected to an input port, the other end thereof being electrically connected to an output port; a second central electrode provided on the ferrite intersecting with the first central electrode and being electrically insulated therefrom, one end of the second central electrode being electrically connected to the output port, the other end thereof being electrically connected to a ground port; a first capacitor electrically connected between the input port and the output port; a resistor electrically connected between the input port and the output port, a second capacitor electrically connected between the output port and the ground port; an input terminal; and an output terminal; wherein a third capacitor is connected between at least one of the input port and the input terminal, and the output port and the output terminal, and a capacitor element is electrically connected between the input terminal and the output terminal.