Patent ID: 8680941

Claim:
A microwave harmonic processing circuit comprising: a serial transmission line having an input terminal connected to an output terminal of a transistor and having a predetermined electrical length; (n−1) parallel open ended stubs differing in length, connected in parallel to an output terminal of the serial transmission line at a single point, and having predetermined electrical lengths corresponding to second to higher n-th (n is any integer) harmonics, respectively; a first transmission line layer configured by connecting the serial transmission line to two parallel open ended stubs of the (n−1) parallel open ended stubs at a single connecting point; a second transmission line layer configured by connecting the (n−3) parallel open ended stubs exclusive of the two parallel open ended stubs at a single connecting point; a ground layer disposed between the first transmission line layer and the second transmission line layer; and a via electrically connecting the connecting point in the first transmission line layer and the connecting point in the second transmission line layer.