Patent ID: 9041496
Filing Date: 2015-05-26
Classification: H01P

Abstract:
1. An adjustable resonator which has a casing composed of walls, a lid and a bottom establishing a resonator cavity therein, a fixed internal conductor galvanically connected to the bottom, whereby the resonator is a coaxial type cavity resonator, and a moveable resonance frequency adjustment piece, wherein said adjustment piece comprises an adjustment member situated in the resonator cavity, which adjustment member has a vertical conductive stem and in an upper end thereof a conductive cap, a conductive upper plate and a dielectric support member, whereto the adjustment member and the conductive upper plate are attached, which conductive upper plate is substantially parallel to and space at a distance from the conductive cap of the adjustment member, above it, and extends in a horizontal plane in every direction almost to the walls of said resonator cavity, which support member extends in a vertical direction through the resonator lid above it, and when the adjustment piece is in an uppermost position, the stem of the adjustment member is completely above the fixed internal conductor, and the stem and the fixed internal conductor are arranged to go at least partly within each other in order to increase a capacitance between the adjustment member and the fixed internal conductor when moving the adjustment piece downwards.