Abstract: In response to the increasing output power of signal generators and the low output power and efficiency of ultra-wideband power amplifiers, this paper proposes a planar microstrip power synthesis technology. This technology mainly uses an ultra-wideband Wilkinson power divider to achieve power distribution and synthesis. Based on this, the paper designs a super-wideband power synthesis circuit using a multi-layer hybrid substrate: the operating frequency is 6 GHz~20 GHz, the saturated output power is greater than 32.5 dBm, and the full-band synthesis efficiency is greater than 70%. After experimental verification, the planar microstrip power synthesis technology can not only improve the output power but also separate the two amplifiers, effectively increasing the heat dissipation area and ensuring the reliability of the circuit.