Patent ID: 6642815
Filing Date: 2003-11-04
Classification: H01P

Abstract:
A dielectric resonator filter comprising:at least one dielectric resonator; an enclosure enclosing the dielectric resonator to function as a shield against an electromagnetic field; resonance-frequency tuning means including a conductor plate disposed in a space enclosed by the enclosure to have a first surface opposed to a surface of the dielectric resonator and a second surface opposed to an inner surface of the enclosure, the resonance-frequency tuning means being capable of changing the separation between the conductor plate and the dielectric resonator; a rod for suppressing propagation of a spurious electromagnetic field mode produced in and around a space between the second surface of the conductor plate and the inner surface of the enclosure, said rod being supported by the conductor plate to fill part of the space defined by the conductor plate and the inner surface of the enclosure; and wherein said rod being independently adjustable within the space between the second surface of the conductor plate and the inner surface of the enclosure in relation to the resonance frequency tuning means.