Compact bipolarization excitation assembly for a radiating antenna element and compact array comprising at least four compact excitation assemblies

A compact bipolarization excitation assembly consisting of an orthomode transducer OMT comprising two transmission pathways, respectively dedicated to two orthogonal polarizations, a first power splitter and a second power splitter respectively connected to the two transmission pathways of the OMT, and a first connection waveguide and a second connection waveguide, the OMT consisting of a cross junction comprising a central waveguide parallel to an axis Z and four lateral ports respectively coupled to the central waveguide and oriented in two directions X and Y orthogonal to one another and to the axis Z, wherein the first power splitter consists of an input waveguide and of two output ports respectively coupled to a first and a second lateral port of the OMT, oriented in the direction X, via the first and the second respective connection waveguide, wherein the first power splitter is located on a first lateral side of the OMT, the input waveguide having a lateral wall orthogonal to the direction X and extending heightwise parallel to the axis Z, wherein the two output ports, respectively upper and lower, of the first power splitter are formed one above the other in the height of said lateral wall of the input waveguide, the upper output port being placed facing the first lateral port of the OMT to which the upper output port is connected by the first connection waveguide, and wherein the first and second connection waveguides have different electrical lengths, the difference in electrical length between the first and second connection waveguides being equal to a half-wavelength λ/2, where λ is a central wavelength of operation.