Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1998-07-29
2000-05-16
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333206, H01P 1201, H01P 1100
Patent
active
060642831
ABSTRACT:
An Ag electrode coated all over the surface of a dielectric block by dipping is partially abraded off for formation of input-output terminal electrodes. Post-firing deformation of the dielectric block due to a green density difference during pressing is thus eliminated by abrasion, thereby making an input-output terminal electrode mount face so flat that the input-output terminal electrodes can be formed with high precision. Chamfered edge areas for preventing chipping of the dielectric block are also removed by abrasion, so that the input-output terminal electrodes can be formed as far as the extreme end of the input-output terminal electrode mount face. The input-output capacity value of the dielectric filter can thus be stabilized with minimized variations of the filter characteristics. It is accordingly possible to provide an inexpensive dielectric filter through a reduced number of process steps, with no need of any regulation of resonance frequency yet with improved yields upon non-regulation.
REFERENCES:
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patent: 4879533 (1989-11-01), de Muro et al.
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patent: 5162760 (1992-11-01), Phillips et al.
patent: 5210511 (1993-05-01), Izumi et al.
patent: 5818312 (1998-10-01), Noguchi et al.
Ham Seungsook
Sumitomo Metal (SMI) Electronics Device, Inc.
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