Abstract: A hollow conductor has a first flange, a second flange, a flexible hollow conductor section, and a first fastening unit. The flexible hollow conductor section is electrically connected both to the first flange and to the second flange in such a way that a radio-frequency signal (RF signal) can be transmitted from the first flange to the second flange or vice versa via the flexible hollow conductor section. The flexible hollow conductor section has a surface, and a first depression is arranged in the surface. The first fastening unit is connected to the first flange. The first fastening unit rests against the surface of the flexible hollow conductor section in a first overlap region in a longitudinal direction of the flexible hollow conductor section and engages in the first depression of the flexible hollow conductor section and thereby fixes the flexible hollow conductor section with respect to the first flange.

Abstract: A resonator for a filter includes a resonator housing, in which a resonator space is formed. The resonator further includes a dielectric arrangement arranged in the resonator space including a first dielectric element and a second dielectric element, the first dielectric element and the second dielectric element being separated from one another in such a way that a gap is formed between them. Both a first thermal expansion coefficient of the first dielectric element and a second thermal expansion coefficient of the second dielectric element are less than a thermal expansion coefficient of the resonator housing. A temperature-related variation of the resonant frequency of the resonator can therefore be compensated for.

Abstract: A resonator for a filter includes a resonator housing, in which a resonator space is formed. The resonator further includes a dielectric arrangement arranged in the resonator space including a first dielectric element and a second dielectric element, the first dielectric element and the second dielectric element being separated from one another in such a way that a gap is formed between them. Both a first thermal expansion coefficient of the first dielectric element and a second thermal expansion coefficient of the second dielectric element are less than a thermal expansion coefficient of the resonator housing. A temperature-related variation of the resonant frequency of the resonator can therefore be compensated for.