Abstract: A 1:4 reciprocal compact E/H hybrid combiner-divider, includes at least one primary waveguide and two secondary waveguides forming a one-piece structure configured such that the primary guide has a first end forming an input/output port and a second end defining an aperture and that each secondary guide has two ends forming two input/output ports, and a side aperture formed on one of the small side faces. The secondary guides are arranged so as to have a common side wall. They are arranged facing the primary waveguide such that the side apertures are situated facing the aperture formed by one of the ends of the primary waveguide and that the common wall is aligned with the central axis of the aperture of the primary waveguide.