Tunable capacitive input coupling
AssigneeAlcatel Lucent
InventorsRaja K. Reddy, Yin-Shing Chong, Teppo M. Lukkarila, Michael Joseph Adkins
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Abstract
Various exemplary embodiments include a cavity having a tuning assembly with tunable capacitive coupling. The tuning assembly may have a recess having a specified depth, designed for a default magnitude of coupling into the cavity. A sleeve may be fully inserted within the recess to have the structure operate at that default coupling magnitude. If a different amount of coupling is desired, the sleeve may be inserted to a particular depth that only includes part of the recess, enabling repeatable tuning of a plurality of cavities.
Claims20
A filter that provides tunable capacitive coupling, the filter comprising:
- a housing having at least one conductive wall that defines a cavity operating at a default frequency;
- a conductive element extending inside said cavity from said at least one conductive wall along an axis;
- and
- a tuning assembly disposed adjacent said at least one conductive wall and separated from said conductive element by a tunable distance, said tuning assembly comprising:
- a hollow sleeve inserted into a recess having a specified depth along said at least one conductive wall and parallel to said axis, said hollow sleeve comprising a non-conductive material and having a particular depth,
- a wire having a first end inserted fully within said hollow sleeve to said particular depth and a second end bent in a direction orthogonal to said axis, thereby having said capacitive coupling fixed to a value that is proportional to said particular depth, and
- a dielectric disposed circumferentially around said first end of said wire, said dielectric retaining said first end of said wire within said hollow sleeve at said particular depth.
A tuning assembly comprising:
- a hollow sleeve inserted into a recess having a specified depth along said at least one conductive wall parallel to an axis, said hollow sleeve comprising a non-conductive material and having a particular depth;
- a wire having a first end fully inserted within said hollow sleeve to said particular depth and a second end bent in a direction orthogonal to said axis thereby having a capacitive coupling fixed to a value that is proportional to said particular depth;
- and
- a dielectric disposed circumferentially around said first end of said wire, said dielectric retaining said first end of said wire within said hollow sleeve at said particular depth.
A method of assembling a filter, said method comprising:
- providing a housing with at least one conductive wall that defines a cavity;
- placing a conductive element within said cavity, said conductive element mounted on said at least one conductive wall and extending from said at least one conductive wall into said cavity along an axis;
- mounting a tuning assembly on said at least one conductive wall, said tuning assembly separated from said conductive element and having an internal recess with a specified depth parallel to said axis;
- inserting a non-conductive sleeve into said internal recess to a particular depth;
- inserting a first end of a wire fully into said sleeve to said particular depth, said wire having a second end bent in a direction orthogonal to said axis;
- and
- placing a dielectric around said first end of said wire to maintain said wire at said particular depth in said sleeve, thereby defining a tuned distance for capacitive coupling between said wire and said conductive element.
Dependencies are inferred from the claim text.