A radar-based fill level meter for determining a fill level 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 (11, 12, 120), 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 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 (11, 12, 120) is arranged, and - a spring element (130, 133), which is used to preload the high-frequency module (11, 12, 120) 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 (11, 12, 120), 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 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 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 (11, 12, 120) is arranged, and - a spring element (130, 133), which is used to preload the high-frequency module (11, 12, 120) 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).