Patent ID: 7978018

Claim:
A non-reciprocal circuit device comprising: a magnetic plate; a plurality of center conductors, each of which has a first end and a second end, the plurality of center conductors being mutually insulated and disposed so as to intersect on the magnetic plate; a plane conductor disposed facing the plurality of center conductors with the magnetic plate placed between the plane conductor and the plurality of center conductors, the plane conductor being connected to the first ends of all of the plurality of center conductors; a plurality of matching capacitors, each of which has a first end and a second end, the first end being directly grounded, the second end being connected directly to the second end of corresponding one of the plurality of center conductors; a plurality of first matching circuits, each of which has a first end and a second end, the first end being connected directly to the second end of corresponding one of the plurality of center conductors, the second end being an input/output port, each of the plurality of the first matching circuits including at least a first pair of an inductor connected in series between each of the plurality of center conductors and the input/output port and a capacitor having a first end and a second end, the first end being connected to one end of the inductor on the input/output port side, the second end being directly grounded; and a second matching circuit having a first end and a second end, the first end being connected to or integrated with the plane conductor, the second end being grounded electrically.