Adjustable electronic filter and method of tuning same

Details Adjustable electronic filter and method of tuning same Adjustable electronic filter and method of tuning same

1987-08-03

1989-01-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333206, 333207, 333222, 333223, H01P 1205, H01P 704

Patent

active

048003484

ABSTRACT:
An adjustable electronic filter apparatus is disclosed comprising a dielectric block having one or more through-holes and having a conformal conductive coating substantially over all outside surfaces as well as each through-hole therein. Each through-hole so plated forms a resonator from a transmission line which includes an open portion, for providing capacitive reactance at a first end, and a short-circuited end as a base, for providing an associated distributed inductance at a second end thereof. A unique method of tuning the adjustable electronic filter, whether a single resonator, a plurality of resonators, or a plurality of intercoupled multi-resonator filters, is disclosed that permits bi-directional tuning for at least one resonator in each of the above exemplary embodiments. By selectively adjusting an inductive portion of the plating at the base of each resonator so tuned, a resonator is quickly and accurately adjusted to a desired frequency. The selective adjusting may be accomplished by subtractive processes, such as abrasion or laser trimming, or by an additive process, such as by adding conductive paint for partially filling in a removed or absent portion of the plating at the base of a resonator.

REFERENCES:
patent: 4157517 (1979-06-01), Kneisel et al.
patent: 4426631 (1984-01-01), D'Avello et al.
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4506241 (1985-03-01), Makimoto et al.
patent: 4523162 (1985-06-01), Johnson

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