Ceramic block filter with bidirectional tuning

Details Ceramic block filter with bidirectional tuning Ceramic block filter with bidirectional tuning

1988-01-29

1989-06-06

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333223, H01P 1202, H01P 704

Patent

active

048375349

ABSTRACT:
Coupled transmission line resonators, such as those in a solid-dielectric ceramic block filter, are fabricated with tuning regions formed by notches in the outer conductor extending longitudinally parallel with the inner conductors from both the low-impedance ends and the high-impedance ends of the resonators. Removing conductive material from the notches in the vicinity of the low-impedance ends of the resonators decreases their resonant frequencies; removing conductive material from the notches in the vicinity of their high-impedance ends increases their resonant frequencies. Sensitivity of tuning depends on the depth of the notches. By situating all tuning regions along a common side of a filter, tuning both higher and lower in frequency may be accomplished without a need to re-orient the filter in a production-line fixture.

REFERENCES:
patent: 4157517 (1979-06-01), Kheisel et al.
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4523162 (1985-06-01), Johnson
patent: 4675632 (1987-06-01), Kawano
patent: 4691179 (1987-09-01), Blum et al.
patent: 4733208 (1988-03-01), Ishikawa et al.

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