Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1989-12-18
1990-10-23
Lee, Benny
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333207, 333223, 29600, H01P 1202
Patent
active
049655370
ABSTRACT:
A ceramic filter employs a novel tuning process which avoids the necessity of etching or abrading plating on the surface of the filter. The tuning is provided by determining a selected frequency related characteristic of the dielectric making up the block portion of the ceramic filter. For example, the quarter wave length frequency of the block may be measured. Next, plating artwork is designed in accordance with the determined selected frequency related characteristic. The artwork is then used for selectively applying a conductive material to a surface of the block in order to shift the determined selected frequency related characteristic to a desired (specified) frequency characteristic. By appropriately designing the artwork based on the determined selected frequency related characteristic, no etching or abrading to the plating on the block is required.
REFERENCES:
patent: 4462098 (1984-07-01), D'Avello et al.
patent: 4692725 (1987-09-01), Fukasawa et al.
patent: 4692726 (1987-09-01), Green et al.
patent: 4757288 (1988-07-01), West
Hackbart Rolland R.
Lee Benny
Motorola Inc.
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