Patent ID: 6920033

Claim:
Variable capacitor, comprising a fixed electrode part and a variable electrode part, a housing bottom, an insulator ring, a housing jacket, a spring bellow, and an adjustment device, wherein the fixed electrode part consists of an inner electrode and an outer electrode galvanically separated from the former; wherein the variable electrode part consists of an inner electrode and an outer electrode connected galvanically with the former; wherein the variable electrode part is connected via an insulator with the adjustment device, and the latter is connected by way of the spring bellow in a gas-tight manner with the housing jacket; wherein the housing jacket is separated from the housing bottom by an insulator ring; and wherein the inner and outer electrodes of the variable electrode part are arranged so as to be able to slide by means of the adjustment device via a guide device and able to dip into the inner and outer electrodes of the fixed electrode part, whereby the spring bellow is current-free.