Eight-way Ka band radial waveguide spatial power divider/combiner

A novel 8-way Ka band radial waveguide spatial power divider/combiner is analyzed and designed through the combination of theoretical research and high frequency electromagnetic field simulation. Compared with traditional coaxial structure, this new design uses a standard rectangular waveguide as the input and output structure. This all metal structure is much simpler, compacter and easier to manufacture. Simulation results show that the relative bandwidth of this device is 34% (the absolute bandwidth is 12 GHz), which nearly covers the whole Ka band, and S11 in the whole working bandwidth is below -20 dB; and that the phase difference of each way is under 5. Using the new Chebyshev transition in the coaxial transition decreases the size of the device, and keeps a good S-parameter in bandwidth. This novel eight-way Ka band radial waveguide spatial power divider/combiner can to be applied to pre-stage solid state power amplifiers and promote the gyro-TWT development.