Filter with an electrically tunable resonator

摘要

The invention relates to an arrangement of the filter or multicoupler type. This arrangement has at least one resonator (1) which can be electronically tuned by tuning device (5), which has at least one tuning element (17) such as a tuning capacitor, switching element (16) for selectively connecting the tuning element electronically to said resonator, and a control device for the switching element. The arrangement is characterized by the fact that the resonator is executed in the form of coaxial resonator (1) of the quarter-wave type, which has central component (2) which has free surface (3) perpendicular to the axis, which is capable of serving as surface for mounting of tuning devices (5). The invention can be used in the domain of filters and multicouplers.