Dielectric resonator apparatus comprising at least three quarter- wavelength dielectric coaxial resonators and having capacitance coupling electrodes

摘要

A dielectric resonator apparatus comprising at least three quarter- wavelength dielectric coaxial resonators in a dielectric block is provided. In the dielectric resonator apparatus, an outer conductor is formed on the surfaces of the dielectric block, and a pair of input and output electrodes for capacitively coupling with the two dielectric coaxial resonators located at both ends is formed close to a first end surface of the dielectric block on a predetermined side surface of the dielectric block so as to be electrically insulated from the outer conductor. Further, two capacitance coupling electrodes for capacitively coupling with the two dielectric coaxial resonators, respectively, which are selected among at least three dielectric coaxial resonators and are located apart from each other so as to put another one dielectric coaxial resonator therebetween, are formed on the predetermined side surface of the dielectric block so as to be electrically insulated from the outer conductor and so as to be apart from the first end surface by a predetermined length. The two capacitance coupling electrodes are electrically connected through a bypass electrode.