2200 W solid-state RF power amplifier module covering 325 MHz and 352 MHz accelerator applications

After developing a 352 MHz 1600 W RF power amplifier with the ART2K0FE transistor from Ampleon, the question was whether we could increase this power with the newer ART2K5TPU transistor with a comparable efficiency. During testing it has become apparent that the circuit can be optimized to cover 325 MHz to 352 MHz at 2.2 kW with an efficiency of more than 70%. An observation has been made for 330 MHz, with a power of more than 2.5 kW at 74% efficiency. Further research showed that the planar balun structure appears to be responsible for this.