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US 8,947,178 B1Granted
Dielectric core tunable filters
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorJames R. Reid, Jr.
Life of this patent
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Abstract
A dielectric core tunable filter for microwave frequencies of 0.5-30 GHz. The filter includes a low loss machined dielectric having multiple channels a portion of which are terminated in micro-electromechanical variable capacitors to realize coupled resonators. The machined dielectric is metalized with a material, such as copper, silver, or gold, and then patterned to provide ring shaped recesses at the ends of preselected channels.
Claims13
A filter for filtering microwave frequencies comprising:
- a filter body having:
- an outer surface;
- a plurality of channels disposed within the filter body, each of the plurality of channels extending with a constant diameter through the filter body and having a first end, a second end, and a channel surface disposed therebetween;
- a recess formed surrounding a channel of the plurality of channels and extending into the filter body thereby creating a tube located within the recess, the recess disposed at the first end of the channel of the plurality of channels;
- and
- a micro-electromechanical (MEM) capacitor disposed on the filter body outer surface at the recess,
- wherein the filter body outer surface and the channel surface have a metalized surface.
4 more elements
Dependencies are inferred from the claim text.