Abstract: A coaxial resonator is provided. The coaxial resonator has a first side and a second side, the coaxial resonator comprising a dielectric disc having a first surface, a second surface and a hole, wherein the second side of the coaxial resonator is connected to the first surface of the dielectric disc, wherein the coaxial resonator further comprises a conductive element connected to second surface of the dielectric disc. A filter comprising a housing, comprising a lid/cover and a chassis having one or more cavities adapted for receiving a coaxial resonator is also provided.

Abstract: A coaxial resonator is provided. The coaxial resonator has a first side and a second side, the coaxial resonator comprising a dielectric disc having a first surface, a second surface and a hole, wherein the second side of the coaxial resonator is connected to the first surface of the dielectric disc, wherein the coaxial resonator further comprises a conductive element connected to second surface of the dielectric disc. A filter comprising a housing, comprising a lid/cover and a chassis having one or more cavities adapted for receiving a coaxial resonator is also provided.

Abstract: The invention relates to a cavity filter for electromagnetic waves. The cavity filter comprises a first casing element (2) and a second casing element (3), which together define a cavity (1), a tuner (11) of dielectric material and a resonator (8) of dielectric material, which resonator is provided with a through-hole to allow the tuner to move at least partially inside the resonator. The resonator is held stationary in the cavity by means of a tube-shaped first support (9) on a first side of the resonator and a tube-shaped second support (10) on a second side of the resonator. The first support is in contact with the resonator at a first contact surface (24), which is adjacent to a first centring surface (25) at an angle to the first contact surface. The second support is in contact with the resonator at a second contact surface (26), which is adjacent to a second centring surface (27) which is at an angle to the second contact surface.