Multi-resonator ceramic filter and method for tuning and adjusti

Details Multi-resonator ceramic filter and method for tuning and adjusti Multi-resonator ceramic filter and method for tuning and adjusti

1990-05-25

1991-04-02

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333207, 333223, 333134, H01P 1202

Patent

active

050049925

ABSTRACT:
A ceramic block filter (114,118) employs a novel tuning process which avoids the necessity of etching or abrading plating on the top surface of the block. Initially, the blocks (210) are prepared from a batch of ceramic material such that their height is intentionally longer than desired, so that the filter center frequency is slightly lower than desired. Next, an artwork mask (310) designed in accordance with pre-selected frequency related characteristics and desired performance specifications is used for applying an electrically conductive material (240) to the top surface of the block (210). Then, the center frequency and resonator length of the block (210) are measured and a new resonator length is calculated using the measured values. The bottom surface of the block (210) is next lapped to the new resonator length. Then, electrically conductive material is applied to the lapped bottom surface of the block (210).

REFERENCES:
patent: 4806889 (1989-02-01), Nakano et al.
patent: 4823098 (1989-04-01), De Muro et al.
patent: 4855693 (1989-08-01), Matsukura et al.
patent: 4965537 (1990-10-01), Kommrusch

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