Patent ID: 8476980

Claim:
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.