Tunable high-frequency filter

High-frequency filter of a coaxial construction, comprising one or more resonators, at least one of the resonators comprising:

• an external conductor housing comprising two opposing end walls comprising a first end wall and a second end wall at a distance therefrom, between which a housing wall is provided peripherally,
• an internal conductor which is configured as an internal conductor tube,
• the internal conductor galvanically connected to the first end wall and extending transversely and perpendicularly from the first end wall towards the second end wall,
• the internal conductor ends being at a distance from the second end wall and/or is galvanically isolated therefrom,
• a pin-shaped or pin-like first tuning element, which protrudes towards the first end wall and which is electrically/galvanically connected to the second end wall,
• the first tuning element dipping into a longitudinal recess formed in the internal conductor tube,
• the first tuning element being mechanically anchored in the second end wall so as to be invariable in the axial length thereof and fixed in rotation,
• a second positionally variable tuning element being provided in the longitudinal recess of the internal conductor, the second tuning element consisting of or comprising dielectric material at least in the region facing the second outer wall,
• the second tuning element being variable in the axial position thereof in the space between the inner face of the internal conductor and the first tuning element,
• the second tuning element being accessible and/or actuatable from the outside of the first end wall so as to bring about a change in axial position.