S-band High-power Solid-state Amplifier And Radial Waveguide Power Combiner Study

We place emphasis on KW class S-band high power SSPA design in this thesis, Thefrenquency is from 2.0 to 2.3GHz, the output power is 1KW through combining six200W PA modules by a 6-way radial-waveguide power combiner.The main work is following: we have studied some key issues such as wide-bandmatching and high power combining techniques to implement S-band hectowatt-levelCW SSPA; we also designed control-circuit for 200 watt PA module using DSP,provided the circuit measuring VSWR, Gain, temperature, current, power and so on; wealso place emphasis on KW S-band high power radial-waveguide power combiner, wehave analyzed the fields in the cavity with one central probe and N equispaced identicalperipheral probes; through theoretical analysis and simulation, we have designed aradial-waveguide power combiner, the CST simulation results show that this combinerachieves broad operating band, which cover 1.3-3.3GHz, with a VSWR less than 1.1across the passband, a high combining efficiency reaches 96％, and a isolation greaterthan -6dB; the tuning result shows the designed 200 Watt final-stage PA has a PldB oflarger than 52dBm, associated with a PAE of 45％in the 2.0 to 2.3GHz frequency band.In the small signal condition, PA gain is (14.2±0.5) dB, saturation output power is up to200W with a efficiency of 60％.