Cavity filter assembly
The present disclosure relates to a cavity filter assembly and, particularly, comprises: a filter body having a cavity, which is a predetermined space therein; and at least one resonance bar having a front end surface that forms a stamped part, which is a protruding surface protruding from the bottom surface of the filter body toward the cavity so as to be parallel to the bottom surface of the filter body in the cavity, for frequency tuning in the cavity, and having a tuning correction hole that penetrates the stamped part, wherein the resonance bar allows frequency tuning to be performed in the cavity through stamping on the outer surface of the stamped part from the outside of the filter body, and the tuned frequency can be corrected through the tuning correction hole, and thus the advantages of reducing the total weight and component costs of an antenna device and improving product productivity are provided.
1 . A cavity filter assembly comprising:
a filter body having a cavity, which is a predetermined space, therein, wherein a resonance bar installation hole is formed in a bottom surface of the filter body; and
at least one resonance bar formed in a cylindrical shape having an open end and a closed end opposite to the open end, the resonance bar being installed on the filter body through the resonance bar installation hole formed in the bottom surface of the filter body so that the closed end is positioned to extend into the cavity toward an upper side of the filter body opposite to the bottom surface,
wherein the resonance bar is formed with a stamped part, which is a protruding surface protruding toward the cavity and protruding from the bottom surface of the filter body, to be parallel to the bottom surface of the filter body for frequency tuning within the cavity, as a front end surface of the closed end, and formed with an open tuning correction hole passing through a center of the stamped part.
2 . The cavity filter assembly of claim 1 , wherein the resonance bar performs the frequency tuning within the cavity through the stamping of the stamped part outside the filter body and corrects the tuned frequency through the tuning correction hole.
3 . The cavity filter assembly of claim 1 , wherein the frequency tuning within the cavity is performed by an operation in which the stamped part of the resonance bar is stamped into the cavity by a stamping tool inserted into the resonance bar and a shape of the stamped part is deformed.
4 . The cavity filter assembly of claim 3 , wherein a correction of the frequency tuning within the cavity is performed by an operation in which the stamped part of the resonance bar is pulled to an outside of the cavity by a pulling tool inserted into the resonance bar from an outside of the filter body and then inserted into the cavity through the tuning correction hole and a shape of the stamped part is deformed.
5 . The cavity filter assembly of claim 1 , further comprising a filter cover coupled along an end of an edge portion of the filter body to form the cavity together with the filter body.
6 . The cavity filter assembly of claim 1 , wherein a coupling flange is formed on an outer surface of the open end of the resonance bar and is coupled in close contact with an outer surface of an edge of the resonance bard installation hole.
7 . The cavity filter assembly of claim 1 , wherein the tuning correction hole is formed in a hole shape having a predetermined diameter at the center of the stamped part.
8 . The cavity filter assembly of claim 1 , wherein a plurality of cavities are provided by a partition wall for partitioning some of adjacent resonance bars among the at least one resonance bar and a window having a shape in which a part of the partition wall is cut.
9 . The cavity filter assembly of claim 1 , wherein the cavity is defined by the filter body manufactured by a molding method to have an enclosure shape having an open one side and a filter cover manufactured by a press method to cover an open one side of the filter body.
10 . The cavity filter assembly of claim 9 , wherein the resonance bar is manufactured by the deep-drawing press method.
11 . The cavity filter assembly of claim 1 , wherein the cavity is defined by the filter body manufactured by a molding method to have a flat shape and a filter cover coupled along an edge end portion of the filter body and manufactured by a deep-drawing press method so that a portion corresponding to the filter body side has an open enclosure shape.
12 . The cavity filter assembly of claim 1 , wherein the cavity is defined by the filter body manufactured by an extrusion method so that one end portion and the other end portion are open in a longitudinal direction and an one side end cover and the other side end cover for covering the open one end portion and the other end portion of the filter body in the longitudinal direction.
13 . A cavity filter assembly comprising:
a filter body for defining a cavity in which resonance is generated, at least forming a bottom surface of the cavity, and formed with at least one resonance bar installation hole formed in the bottom surface and passing through the bottom surface to communicate between an inside and an outside of the filter body;
a filter cover for defining the cavity together with the filter body and shielding an open portion of the filter body; and
at least one resonance bar formed in a cylindrical shape having an open end and a closed end opposite to the open end, the resonance bar being installed to occupy a part of an internal space of the cavity defined by the filter body and the filter cover through the resonance bar installation hole of the filter body so that the closed end is positioned inside the cavity and performing frequency tuning through the deformation of a protruding surface formed as a stamped part of a front end of the closed end inside the cavity, wherein the resonance bar is formed with an open tuning correction hole passing through the stamped part.