Patent ID: 7825744

Claim:
A nonreciprocal circuit device comprising: a permanent magnet; a ferrite arranged to receive a direct-current magnetic field from the permanent magnet; a first central electrode and a second central electrode arranged on the ferrite so as to cross each other and so as to be electrically insulated from each other, a first end of the first central electrode is electrically connected to an input port and a second end of the first central electrode is electrically connected to an output port, a first end of the second central electrode is electrically connected to the output port and a second end of the second central electrode is electrically connected to a ground port; a first matching capacitor electrically connected between the input port and the output port; a second matching capacitor electrically connected between the output port and the ground port; a resistor electrically connected between the input port and the output port; and a bypass circuit electrically connected between the input port and the output port and including a phase shift portion and a filter portion arranged to prevent signals in a fundamental wave band from passing through the bypass circuit; wherein the bypass circuit is arranged such that, while performing phase shifting, the bypass circuit generates unnecessary waves having an opposite phase to that of unnecessary waves at the output port, and the bypass circuit selectively passes the generated unnecessary waves having the opposite phase to cancel out the unnecessary waves at the output port.