US 5,682,674 AGranted

Dielectric filter and method of manufacturing the same

AssigneeFuji Electrochemical Co., Ltd.

InventorsKazuhisa Yamazaki, Utsuo Kihara, Yasuo Suzuki, Kazuaki Endo, Mitsuru Kojima

Life of this patent

Estimating the term…

Loading patent…

Abstract

A plurality of dielectric sheets are laminated and bonded together to constitute a laminated board. A plurality of strip-shaped resonance electrodes are formed in parallel on a predetermined bonding face of the dielectric sheets, and the strip-shaped resonance electrodes reach opposite edges of the laminated board. Recesses are formed by locally cutting out the portions of the edges of the laminated board in which the respective resonance electrodes are exposed at their particular ends. Grounding electrodes are respectively formed on the obverse and reverse faces of the laminated board, and edge grounding electrodes are formed in the portions of the opposite edges of the laminated board except for the recess.

Claims1

Dependent claims

A method of producing a dielectric filter, wherein said dielectric filter comprises a laminated board having a plurality of dielectric sheets bonded together, a plurality of strip-shaped resonance electrodes formed in parallel on a predetermined bonding face of said dielectric sheets, input/output electrodes connected to said strip-shaped resonance electrodes and grounding electrodes formed on peripheral faces of said laminated board, said grounding electrodes and said resonance electrodes being separated from one another by recesses, said method comprising the steps of:

laminating said dielectric sheets to form parallel strip-shaped resonance electrode patterns and input/output electrode patterns of predetermined shapes on a surface of a predetermined one of said dielectric sheets by thermocompression;
forming through-holes by machining at positions where said dielectric sheets are cut for said resonance electrode patterns and
forming said recesses and said laminated board by cutting said dielectric sheets at predetermined positions passing through said respective through-holes, and sintering said laminated board.

Dependencies are inferred from the claim text.