A new ultra-wideband multi-way coaxial power combiner

A novel ultra-wideband multi-way coaxial power combiner is presented in this paper. In the new structure, there is an extended coaxial waveguide cavity, where the microwave signal can be transmitted smoothly with little reflection, and 24 ultra-wideband coupling probe of great efficiency. The transmission waveguide type is changed from coaxial waveguide to parallel boards at the edge of the extended coaxial waveguide cavity. For 6GHz-18GHz ultra-wideband application, the output port of the coupling probe is technically designed with the λ/4 impedance matching. Simulation and measured results well agree with each other, showing that the insertion loss SR₂₁ is around -2dB and the return loss SR₁₁ is below -10dB, which is practically feasible for ultra-wideband power combining.