The invention relates to a radial power combination system that comprises: a radial splitter (10) that includes rectangular wave-guide accesses (16) at the periphery; a radial combiner (10') superimposed to the radial splitter and including rectangular wave-guide accesses (16') at the periphery; a first input transition (11) emitting a first signal at the centre of the radial splitter; a second output transition (11') receiving the first amplified signal towards the output of the radial combiner (10'); at least two amplification paths (15) including: a third input transition (22) capable of interacting with the guides (16); a fourth output transition (23) capable of interacting with the guides (16'); and at least one amplifier (24). The system of the invention includes a means (29) for adjusting the positioning of the amplification paths, and thereby adjusting the phase shift of the different paths.