Resonant coupling elements

Abstract

A coupled filter section is formed with a two piece construction. The filter section includes a first portion formed as a first unitary piece which has relief areas therein which define a plurality of cavities, a corresponding plurality of resonators or resonator portions located within each of the of cavities, a plurality of channels allowing magnetic coupling between adjacent cavities, and a plurality of coupling stubs disposed within the channels. The second piece is affixed to the first portion to substantially enclose the relief areas of the first portion. Preferably, the second piece includes post sections which are coaxially aligned with the resonators. The coupled filter section can include coupled triplet and coupled quadruplet sections.

Dependencies are inferred from the claim text.