Method for tuning the center frequency of embedded microwave filters
AssigneeNorthrop Grumman Corporation
InventorsMichael A. Hageman, Cynthia W. Berry
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Abstract
A method of tuning the frequency response of filters embedded in or formed on a ceramic substrate, such as but not limited to a low temperature co-fired ceramic substrate (LTCC), by re-firing a previously fired LTCC substrate to a temperature which is greater by a predetermined, relatively small, amount than that of the temperature produced during the original firing profile of the substrate so as to change the dielectric constant of the substrate, and thus cause a desired shift in the filter's frequency response.
Claims12
A method of changing the frequency response of a microwave filter fabricated in connection with a substrate of ceramic material, comprising:
- re-firing the substrate at a second temperature higher than the initial firing temperature so as to cause a change in the dielectric constant of the ceramic material, thereby changing the frequency response of said filter.
Dependencies are inferred from the claim text.