Patent ID: 7573430
Filing Date: 2009-08-11
Classification: H01P,H01Q,Y10T

Abstract:
1. A microwave filter with an at least partially enclosed cavity, comprising: an outer support structure; an electric layer, arranged on the inside of the support structure and facing the cavity; an inner support structure being arranged between the outer support structure and the electric layer and adapted to impart at least one of improved thermal stability and mechanical strength to the filter in interaction with the outer support structure; and a first inner protective layer being arranged on the electric layer and facing the cavity, wherein the cavity includes a plurality of put-together cavities, the electric layer of the respective cavities being interconnected; wherein the outer support structure is comprised of a cast material and has such thermal stability and the electric layer has such electric properties and dimensional tolerances that electric requirements on the filter can be fulfilled without trimming or similar adjustment after manufacture.