High frequency signal generation apparatus

An apparatus for generating a high frequency signal comprising:

• a first coupler configured to receive two output signals, having 180° phase difference, outputted from a first differential generator as two input signals, and output a first voltage signal generated by adding the two input signals and a second voltage signal corresponding to subtraction of the two input signals;
• a second coupler configured to receive two output signals, having 180° phase difference, outputted from a second differential generator as two input signals, and output a third voltage signal generated by adding the two input signals and a fourth voltage signal corresponding to subtraction of the two input signals;
• a coupling network connected to the first differential generator and the second differential generator so that the first differential generator and the second differential generator are in phase;
• and
• a third coupler configured to output a signal generated by adding the second voltage signal and the fourth voltage signal.