Radar-fill-level measuring device

A radar fill-level measuring device for measuring a fill level of a fill substance in a container using the travel time principle, comprising:

• a circuit board with a sending/receiving system for sending and receiving high-frequency radar waves and an evaluation unit for determining travel time of the radar waves reflected from a surface of the fill substance, said circuit board has at least two openings, wherein said sending/receiving system has a coupling element for out- and in-coupling of radar waves, an end of said coupling element is arranged on a first side of said circuit board centrally between said at least two openings;
• a hollow conductor with at least two lateral edge projections, which are embodied as a lengthening of an end of said hollow conductor parallel to the longitudinal axis of said hollow conductor, wherein lengths of said at least two lateral edge projections are greater than the thickness of said circuit board, and wherein said at least two lateral edge projections are led through said at least two openings, so that said at least two lateral edge projections extend partially out from a second side of said circuit board and
• a lid, which is secured to parts of said at least two lateral edge projections, which extend out from the second side of said circuit board, such that said hollow conductor is secured to said circuit board by means of said lid.