COMB-LINE FILTER STRUCTURE HAVING REDUCED LENGTH AND WIDTH

摘要

The comb-line filter is formed by a housing and a plurality of U-shaped resonator elements each having one end connected directly to the grounded housing and the other end connected to the housing through a lumped capacitor. Each of a first set of partitions is disposed between the legs of the U-shaped elements to form a coaxial structure therewith and each of a second set of partitions is disposed either between adjacent resonator elements, between adjacent lumped capacitors, or between an adjacent resonator element and lumped capacitor to control the coupling between resonant cells.