Patent Number: 6,294,968

Title: Dielectric filter and process for producing same

Abstract: A dielectric filter including at least three coaxial dielectric resonators of predetermined size which are bonded as arranged side by side. The resonators serving respectively as an input stage and an output stage are each formed with an external connection electrode positioned on the peripheral surface other than the adjoining surface in proximity to an exposed end face and insulated from an outer conductor layer. An inner conductor layer of the resonator serving as an intermediate stage is removed over only a suitable region from an exposed end face thereof so as to approximately match the resonance frequency of the intermediate-stage resonator to the resonance frequency of the input-stage and the output-stage resonators. The dielectric filter may include at least three coaxial dielectric resonators which are bonded as arranged side by side. An interstage coupling window is formed in each of the adjoining surfaces of the adjacent resonators, approximately at an axial midportion thereof by removing an outer conductor layer. An external connection electrode, insulated from the layer, is formed on each of the resonators serving as an input stage and an output stage approximately at an axial midportion of the outer peripheral surface other than the adjoining surface.

Inventors: Ito; Atsushi (Ena, JP), Ota; Satoru (Hirakata, JP)

Assignee: Sanyo Electric Co., Ltd

International Classification: H01P 1/20 (20060101); H01P 1/205 (20060101); H01P 001/20 (); H01P 007/04 ()

Expiration Date: 09/25/2018