A system comprising a coaxial cable and a first and second ground planes (GP1, GP2), for connecting the shield of the coaxial cable to the first and second ground planes (GP1, GP2) of a stripline, this system further comprising a grounding interface part, a solder, and tightening means (TR, NT); said grounding interface part comprising a first area that can be soldered to the shield of the coaxial cable by means of said solder, a second area and a third area that can be respectively pressed onto the first and second ground planes (GP1, GP2) by the tightening means (TR, NT) so that the second area is in electrical contact with the first ground plane and the third area is in electrical contact with the second ground plane; characterized in that: - said grounding interface part comprises a cylindrical conductive tube such that: -- the first area of said grounding interface part comprises the outer cylindrical surface of the cylindrical conductive tube, this outer cylindrical surface being soldered to the shield of the coaxial cable so that the axis of revolution of the cylindrical conductive tube is orthogonal to the longitudinal axis of the coaxial cable; -- the second area of said grounding interface part comprises a first end of the cylindrical conductive tube, this first end being plane and orthogonal to the axis of revolution of said conductive cylindrical tube; -- the third area comprises a second end of the cylindrical conductive tube, this second end being plane and orthogonal to the axis of revolution of said cylindrical conductive tube; - said grounding interface part further comprises a cylindrical centering tube closely fitting into the cylindrical conductive tube and having a length lower than or equal to the length of the cylindrical conductive tube; - the tightening means comprise: -- a threaded rod closely fitting into the centering cylindrical tube, this threaded rod having a length greater than the length of the cylindrical conductive tube, -- and at least one bolt that is screwed on said treaded rod. - said grounding interface part comprises a cylindrical conductive tube such that: -- the first area of said grounding interface part comprises the outer cylindrical surface of the cylindrical conductive tube, this outer cylindrical surface being soldered to the shield of the coaxial cable so that the axis of revolution of the cylindrical conductive tube is orthogonal to the longitudinal axis of the coaxial cable; -- the second area of said grounding interface part comprises a first end of the cylindrical conductive tube, this first end being plane and orthogonal to the axis of revolution of said conductive cylindrical tube; -- the third area comprises a second end of the cylindrical conductive tube, this second end being plane and orthogonal to the axis of revolution of said cylindrical conductive tube; -- the first area of said grounding interface part comprises the outer cylindrical surface of the cylindrical conductive tube, this outer cylindrical surface being soldered to the shield of the coaxial cable so that the axis of revolution of the cylindrical conductive tube is orthogonal to the longitudinal axis of the coaxial cable; -- the second area of said grounding interface part comprises a first end of the cylindrical conductive tube, this first end being plane and orthogonal to the axis of revolution of said conductive cylindrical tube; -- the third area comprises a second end of the cylindrical conductive tube, this second end being plane and orthogonal to the axis of revolution of said cylindrical conductive tube; - said grounding interface part further comprises a cylindrical centering tube closely fitting into the cylindrical conductive tube and having a length lower than or equal to the length of the cylindrical conductive tube; - the tightening means comprise: -- a threaded rod closely fitting into the centering cylindrical tube, this threaded rod having a length greater than the length of the cylindrical conductive tube, -- and at least one bolt that is screwed on said treaded rod. -- a threaded rod closely fitting into the centering cylindrical tube, this threaded rod having a length greater than the length of the cylindrical conductive tube, -- and at least one bolt that is screwed on said treaded rod.