Wilkinson power divider, Wilkinson power combiner, and amplifier

A Wilkinson power divider comprising:

• an input line;
• a first branching line and a second branching line branching from the input line;
• a first output line coupled to a first end of an output side of the first branching line;
• a second output line coupled to a second end of an output side of the second branching line;
• a first stub coupled to the first end;
• a second stub coupled to the second end;
• an isolation resistor coupled between the first stub and the second stub;
• a first circuit branching from a first point between two ends of the first stub, and a second point between two ends of the second stub, and coupling between the first point and the second point;
• and
• a second circuit branching from a third point between the two ends of the first stub, and a fourth point between the two ends of the second stub, and coupling between the third point and the fourth point, wherein
• at least a first portion of the first stub, at least a first portion of the second stub, and the first circuit form a first resonant circuit, and
• at least a second portion of the first stub other than the first portion of the first stub, at least a second portion of the second stub other than the first portion of the second stub, and the second circuit form a second resonant circuit.

An amplifier comprising:

• a Wilkinson power divider including:
• an input line,
• a first branching line and a second branching line branching from the input line,
• a first output line coupled to a first end of an output side of the first branching line,
• a second output line coupled to a second end of an output side of the second branching line,
• a first stub coupled to the first end,
• a second stub coupled to the second end,
• a first isolation resistor coupled between the first stub and the second stub, and
• a first circuit branching from a first point between two ends of the first stub, and a second point between two ends of the second stub, and coupling between the first point and the second point,
• wherein at least a first portion of the first stub, at least a first portion of the second stub, and the first circuit form a first resonant circuit;
• a Wilkinson power combiner including:
• an output line,
• a first merging line and a second merging line merging to the output line,
• a first input line coupled to a first input end of the first merging line,
• a second input line coupled to a second input end of the second merging line,
• a third stub coupled to the first input end,
• a fourth stub coupled to the second input end,
• a second isolation resistor coupled between the third stub and the fourth stub, and
• a third circuit branching from a fifth point between two ends of the third stub, and a sixth point between two ends of the fourth stub, and coupling between the fifth point and the sixth point,
• wherein at least a portion of the third stub, at least a portion of the fourth stub, and the third circuit form a third resonant circuit;
• a first amplifier unit coupled between the first branching line and the first merging line;
• and
• a second amplifier unit coupled between the second branching line and the second merging line.