The present invention relates to a transition between a microstrip line / waveguide, in particular between an antenna (1) of the antenna plate to the radiating elements (3) and supply lines (4) printed on one face of a substrate (2) and a waveguide or a resonant cavity (12) to a rectangular cross section. The end wall of the waveguide, or of the cavity (12) is in a plane parallel to the plane containing the radiating elements (3) of the antenna (1) and their supply lines (4). The transition comprises a conductor, a first end of which is in galvanic contact with the main power supply point a of the antenna (1) and which passes through the substrate (2) of the antenna (1) in the direction of its thickness and opens into the waveguide, or the cavity (12), by a hole (9) in the end wall of the waveguide, or of said cavity (12), the second end of said conductor is in galvanic contact with an internal lateral wall of the waveguide, or of the cavity (12), substantially in the middle transverse that - c 1 and at a distance from the end wall equal to approximately a quarter of the length of the guided wave in the waveguide, or the cavity (12), the plane containing the driver is substantially perpendicular to the wide side wall 12 "of the waveguide or cavity (12).
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