Abstract: The present invention relates to a coaxial cavity resonator having walls delimiting cavity, and one resonator body having a conductive rod with a first end being in short circuit relation to a first wall of the cavity walls. the first end a cross-sectional area. The resonator further includes a first conductive supportive plate with a first side connected to the first end of each rod. The first side has a larger area than the cross-sectional area of the first end of the rod and a second side, opposite the first side, fo the supportive plate is electrically connected to the first wall. A retainer is provided in the first cavity wall to guide the supportive plate, and an attachment is provided to secure the first supportive plate to the retainer. The invention also relates to a filter and a use of a resonator component in a filter.

Abstract: The construction is a coaxial cavity resonator (20, 30, 40, 50) comprising at least one conductive body (11, 31), which body is open at one end and shortened from a quarter-wave resonator. The conductive body includes a main rod (16), which is in one end attached to the cavity wall (15), and a main disc (17) attached to the free end of the main rod (16). The cavity (12) further comprises one or more conductive plates (21, 41, 51) located between the main disc (17) and the side walls (13), at the first side (17a) of, and out of galvanic contact with, the main disc (17). The shortening is carried out by creating air-insulated extra capacitance between the resonator cavity walls via the conductive plates and a mechanical structure at the open end of the conductive body.