Patent ID: 8624691
Filing Date: 2014-01-07
Classification: H01P

Abstract:
1. A cavity filter, comprising: a unitarily formed piece comprising a bottom plate portion, a resonator tube body portion formed on a center of the bottom plate portion, and a sidewall portion extending from the bottom plate portion surrounding the resonator tube body portion, the resonator tube body portion defining a resonating cavity therein; a cap attached onto a distal end of the resonator tube body portion, the cap and the resonator tube body portion cooperatively forming a resonator tube; a cover attached to the sidewall portion, and the cover comprising a screw hole; the cover, the sidewall portion, and the bottom plate portion cooperatively forming a chamber; and a tuning adjustment screw extending through the cover, threadedly engaged in the screw hole and aligned with the resonator tube, wherein the resonator tube body portion comprises an inner annular step surface located in the resonating cavity, the cap comprises an inner tube, an outer tube surrounding the inner tube, and a ring-shaped flange extending outwardly from the inner tube to the outer tube, the inner tube is inserted in the resonator tube body portion and abuts the inner annular step surface, the ring-shaped flange is attached on the distal end of the resonator tube body portion.