High frequency power amplifier

A power amplifier comprising:

• an amplifying circuit configured to amplify an input signal having a fundamental frequency to generate a first amplified signal and a second amplified signal of which a phase is opposed to said first amplified signal;
• a first transmission line configured to add a first group of phases, different in correspondence with a frequency, to said first amplified signal by using a left-handed material to generate a first transmission signal;
• a second transmission line configured to add a second group of phases, different in correspondence with a frequency, to said second amplified signal by using a right-handed material to generate a second transmission signal;
• and
• a third transmission line configured to overlap said first and said second transmission signals to generate an output signal,
• wherein said first and said second groups of phases comprises a phase difference configured to weaken a second harmonic and a third harmonic which have a frequency two times and three times higher than said fundamental frequency, respectively,
• wherein said amplifying circuit comprises:
• an input side balun circuit section configured to generate on the basis of an input signal a first signal and a second signal having a phase opposite to said first signal;
• a first amplifier configured to amplify said first signal to generate said first amplified signal;
• and
• a second amplifier configured to amplify said second signal in a same condition as said first amplifier to generate said second amplified signal, and
• wherein said first amplifier and said second amplifier are connected downstream of said input side balun circuit section in a push-pull style.