Sanyo Electric Co., Ltd.

Other

Sanyo Electronic Components Co., Ltd.

Atsushi Ito

Satoru Ota

Yasuhiko Okamoto

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.

Dielectric filter and process for producing same

A process for producing a dielectric filter by bonding coaxial dielectric resonators of predetermined size as arranged side by side. The process comprises forming interstage coupling windows by removing an outer conductor layer from the same region of each of adjoining surfaces of the resonators to be adjacent to each other, and bonding the resonators as arranged side by side in proximity to each other on a smooth-surfaced table with an electrically conductive bonding material applied to at least one of the outer conductive layers remaining on the adjoining surfaces.

Coaxial resonators serving as input and output stages are arranged on a dielectric substrate having input and output coupling strip lines and a grounding electrode formed in the same plane as the strip lines and surrounding the strip lines. The substrate is shaped substantially in conformity with the bottom contour of the resonators as arranged on the substrate.

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Ena, Japan

Atsushi Ito