A radar-based fill level meter for determining a fill level (L) of a filling material , comprising the following components: - An antenna assembly , which can be activated via a high-frequency connection in the form of a waveguide, o with which a radar signal (S HF ) can be sent in the direction of the filling material , and ∘ with which a receive signal (R HF ) can be received once the radar signal (S HF ) has been reflected on the surface of the filling material, - a high-frequency module , with o a transmitter/receiver unit , which is configured to generate the radar signal (S HF ) and, once it has been reflected on the surface of the filling material, to determine the filling level (L) based on the corresponding receive signal (R HF ), with o electronic encapsulation , in which the transmitter/receiver unit is arranged, and with o a waveguide segment , which is connected to the transmitter/receiver unit in order to transmit the radar signals (S HF , R HF ) in such a way that the waveguide segment is guided out of the electronic encapsulation , - a device housing connected to the antenna assembly , in which the high-frequency module is arranged, and - a spring element , which is used to preload the high-frequency module opposite the device enclosure in such a way that the waveguide segment is pressed against the high-frequency connection with a corresponding force in the direction of a shared waveguide axis (a). - An antenna assembly , which can be activated via a high-frequency connection in the form of a waveguide, o with which a radar signal (S HF ) can be sent in the direction of the filling material , and ∘ with which a receive signal (R HF ) can be received once the radar signal (S HF ) has been reflected on the surface of the filling material, o with which a radar signal (S HF ) can be sent in the direction of the filling material , and ∘ with which a receive signal (R HF ) can be received once the radar signal (S HF ) has been reflected on the surface of the filling material, - a high-frequency module , with o a transmitter/receiver unit , which is configured to generate the radar signal (S HF ) and, once it has been reflected on the surface of the filling material, to determine the filling level (L) based on the corresponding receive signal (R HF ), with o electronic encapsulation , in which the transmitter/receiver unit is arranged, and with o a waveguide segment , which is connected to the transmitter/receiver unit in order to transmit the radar signals (S HF , R HF ) in such a way that the waveguide segment is guided out of the electronic encapsulation , o a transmitter/receiver unit , which is configured to generate the radar signal (S HF ) and, once it has been reflected on the surface of the filling material, to determine the filling level (L) based on the corresponding receive signal (R HF ), with o electronic encapsulation , in which the transmitter/receiver unit is arranged, and with o a waveguide segment , which is connected to the transmitter/receiver unit in order to transmit the radar signals (S HF , R HF ) in such a way that the waveguide segment is guided out of the electronic encapsulation , - a device housing connected to the antenna assembly , in which the high-frequency module is arranged, and - a spring element , which is used to preload the high-frequency module opposite the device enclosure in such a way that the waveguide segment is pressed against the high-frequency connection with a corresponding force in the direction of a shared waveguide axis (a). <EOS>