APPARATUS AND METHOD OF CORRECTING OUTPUT CHARACTERISTICS IN POWER COMBINATION APPARATUS

PROBLEM TO BE SOLVED: To provide an apparatus and a method that correct output characteristics through shifting the phases of a plurality of power amplifiers constituting a power combination apparatus.SOLUTION: A method of correcting output characteristics in a power combination apparatus includes the steps of: synchronizing digital up-converters included in a plurality of power amplifiers; adjusting a fine delay between signals coupled by the digital up-converters based on a frequency assignment; combining fine delay-compensated signals and output signals from the plurality of power amplifiers; and outputting the combined signal. If a combination gain acquired from the combined signal does not satisfy a predetermined reference value, the phase of an internal signal of a master power amplifier is shifted by a predetermined value. The phase of the internal signal of the master power amplifier is shifted by a value defined in a look-up table in correspondence with the voltage standing wave ratio of each of the plurality of power amplifiers.