A miniaturized cavity filter

Abstract

The utility model discloses a miniaturized cavity filter, including cavity, apron, resonator, tuning screw rod and tuning nut, resonator sets up in the cavity, apron sets up at the opening of cavity, still include connecting piece, connecting piece has first connecting section and second connecting section, be provided with mounting hole on apron, first connecting section is installed in mounting hole department and has the through -hole of communicating with outside, second connecting section is located in the cavity and has the internal thread hole of communicating with through -hole, and tuning screw rod is worn in through -hole and is connected in internal thread hole with screw thread, and tuning nut is connected on tuning screw rod with screw thread and abuts with first connecting section, through above -mentioned structure can not need to set up threaded hole on apron, make apron's thickness can be greatly reduced, reach the purpose of reducing weight and reducing the cost, have very good practicality.

Description

Technical Field

[0001] This utility model relates to the field of filters, and in particular to a miniaturized cavity filter. Background Technology

[0002] Cavity filters typically consist of a cavity, a cover plate, a resonator, a tuning screw, and a tuning nut. The tuning screw is pre-threaded through the tuning screw nut, and then rotated through the threads on the cover plate to extend into the cavity. The tuning screw is repeatedly tightened according to the changes in the vector network analyzer graph until the filter's performance meets design requirements. Finally, the nut is tightened, relying on the friction between the tuning screw and the cover plate to secure it. UV adhesive is then applied to prevent loosening. However, this approach involves directly creating threaded holes in the cover plate. Furthermore, to accommodate at least three effective threads, the cover plate thickness is ≥2.5mm, resulting in higher material costs and a heavier overall weight, hindering the miniaturization of cavity filters. Therefore, a miniaturized cavity filter is urgently needed to address these issues. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a miniaturized cavity filter.

[0004] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a miniaturized cavity filter, including a cavity, a cover plate, a resonator, a tuning screw, and a tuning nut. The resonator is disposed in the cavity, the cover plate is disposed at the opening of the cavity, and a connector is also included. The connector has a first connecting section and a second connecting section. The cover plate is provided with a mounting hole. The first connecting section is installed at the mounting hole and has a through hole communicating with the outside. The second connecting section is located in the cavity and has an internal threaded hole communicating with the through hole. The tuning screw passes through the through hole and is threadedly connected to the internal threaded hole. The tuning nut is threadedly connected to the tuning screw and abuts against the first connecting section.

[0005] In one of the preferred embodiments of this utility model, the connecting member is configured as a rivet nut, which includes a stop part, a deformation part and a threaded connection part; The stop is located at one end of the deformable part and abuts against the outside of the cover plate; The deformable part can deform under the action of external equipment and abut against the inside of the cover plate. The stop part and the deformable part together form the first connecting section. A threaded connection is provided at the other end of the deformed part to form a second connection section.

[0006] In one of the preferred embodiments of this utility model, the diameter of the through hole is larger than the diameter of the internal threaded hole.

[0007] As one of the preferred embodiments of this utility model, the tuning screw and / or connector is made of copper.

[0008] As one of the preferred embodiments of this utility model, the thickness of the cover plate is ≤1mm.

[0009] The beneficial effects of this utility model are as follows: A miniaturized cavity filter includes a cavity, a cover plate, a resonator, a tuning screw, and a tuning nut. The resonator is disposed inside the cavity, and the cover plate is disposed at the opening of the cavity. It also includes a connector with a first connecting section and a second connecting section. The cover plate has a mounting hole. The first connecting section is installed at the mounting hole and has a through hole communicating with the outside. The second connecting section is located inside the cavity and has an internally threaded hole communicating with the through hole. The tuning screw passes through the through hole and is threaded into the internally threaded hole. The tuning nut is threaded onto the tuning screw and abuts against the first connecting section. This structure eliminates the need for a threaded hole in the cover plate, significantly reducing the thickness of the cover plate and achieving weight and cost reduction, thus demonstrating excellent practicality. Attached Figure Description

[0010] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 An exploded view of a miniaturized cavity filter; Figure 2 This is a cross-sectional view of a miniaturized cavity filter; Figure 3 This is a schematic diagram of the assembly of the connector and the cover plate. Detailed Implementation

[0011] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0012] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0013] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0015] Reference Figures 1-3 A miniaturized cavity filter includes a cavity 10, a cover plate 20, a resonator 30, a tuning screw 40, and a tuning nut 50. The resonator 30 is disposed inside the cavity 10, and the cover plate 20 is disposed at the opening of the cavity 10. The filter also includes a connector 60, which has a first connecting section 60a and a second connecting section 60b. The cover plate 20 is provided with a mounting hole 21. The first connecting section 60a is installed at the mounting hole 21 and has a through hole 60c communicating with the outside. The second connecting section 60b is located inside the cavity 10 and has an internal threaded hole 60d communicating with the through hole 60c. The tuning screw 40 passes through the through hole 60c and is threadedly connected to the internal threaded hole 60d. The tuning nut 50 is threadedly connected to the tuning screw 40 and abuts against the first connecting section 60a.

[0016] In this invention, during debugging, the resonator 30 is installed inside the cavity 10, and the first connecting section 60a of the connector 60 is installed on the mounting hole 21 of the cover plate 20, so that the second connecting section 60b is located inside the cover plate 20. After the cover plate 20 is installed at the opening of the cavity 10, the tuning screw 40 is inserted into the through hole 60c on the first connecting section 60a and threaded into the internal thread hole 60d on the second connecting section 60b. The tuning nut 50 is threaded onto the tuning screw 40. The filter is connected to the vector network analyzer, and the tuning screw 40 is repeatedly tightened according to the changes in the graph until the performance of the filter meets the design requirements. Then the tuning nut 50 is tightened until it abuts against the first connecting section 60a and is tightened.

[0017] Reference Figures 1-3 In some embodiments, the connector 60 is configured as a rivet nut, which includes a stop portion 61, a deformation portion 62, and a threaded connection portion 63. The stop 61 is provided at one end of the deformable part 62 and abuts against the outside of the cover plate 20; The deformable part 62 can deform under the action of external equipment and abut against the inner side of the cover plate 20. The stop part 61 and the deformable part 62 together constitute the first connecting section 60a. A threaded connection portion 63 is provided at the other end of the deformable portion 62 to form a second connection section 60b.

[0018] Specifically, during assembly, the resonator 30 is installed inside the cavity 10, and the threaded connection 63 of the rivet nut 60 is inserted from the outside to the inside into the mounting hole 21 of the cover plate 20 until the stop 61 abuts against the outer side of the cover plate 20. A rivet gun is then used to rivet the nut, causing the deformable part 62 to deform and bulge, abutting against the inner side of the cover plate 20, thus fixing the entire rivet nut onto the cover plate 20. The cover plate 20 is installed at the opening of the cavity 10. Then, the tuning screw 40 is inserted into the through hole 60c constructed on the stop part 61 and the deformation part 62 and threaded into the internal thread hole 60d constructed on the threaded connection part 63, and the tuning nut 50 is threaded onto the tuning screw 40; the filter is connected to the vector network analyzer and the tuning screw 40 is repeatedly tightened according to the changes in the graph until the performance of the filter meets the design requirements, and then the tuning nut 50 is tightened until it abuts against the stop part 61 and is tightened.

[0019] Reference Figures 1-3 In some embodiments, the diameter of the through hole 60c is larger than the diameter of the internal thread hole 60d. This arrangement allows debris that may be generated during the screwing process of the tuning nut 50 and the tuning screw 40 to be contained in the through hole 60c, preventing it from falling into the cavity 10.

[0020] Reference Figures 1-3 In some embodiments, the tuning screw 40 and / or the connector 60 are made of copper. Copper has a low coefficient of friction with copper, which can reduce the amount of debris generated during filter tuning that enters the cavity 10.

[0021] Reference Figures 1-3 In some embodiments, the thickness of the cover plate 20 can be reduced to ≤1mm, and the weight can be reduced by more than 50%.

[0022] The advantages of this utility model are: the above structure eliminates the need for threaded holes in the cover plate, which greatly reduces the thickness of the cover plate, achieving the purpose of weight reduction and cost reduction, and has very good practicality.

[0023] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A miniaturized cavity filter, comprising a cavity (10), a cover plate (20), a resonator (30), a tuning screw (40), and a tuning nut (50), wherein the resonator (30) is disposed within the cavity (10), and the cover plate (20) is disposed at the opening of the cavity (10), characterized in that: It also includes a connector (60), which has a first connecting section (60a) and a second connecting section (60b). The cover plate (20) is provided with a mounting hole (21). The first connecting section (60a) is installed in the mounting hole (21) and has a through hole (60c) communicating with the outside. The second connecting section (60b) is located in the cavity (10) and has an internal threaded hole (60d) communicating with the through hole (60c). The tuning screw (40) passes through the through hole (60c) and is threadedly connected to the internal threaded hole (60d). The tuning nut (50) is threadedly connected to the tuning screw (40) and abuts against the first connecting section (60a).

2. The miniaturized cavity filter according to claim 1, characterized in that: The connector (60) is configured as a rivet nut, which includes a stop part (61), a deformation part (62) and a threaded connection part (63). The stop (61) is disposed at one end of the deformable part (62) and abuts against the outside of the cover plate (20); The deformable part (62) can deform under the action of external equipment and abut against the inner side of the cover plate (20). The stop part (61) and the deformable part (62) together constitute the first connecting section (60a). The threaded connection (63) is disposed at the other end of the deformable part (62) to form the second connection segment (60b).

3. A miniaturized cavity filter according to claim 1, characterized in that: The diameter of the through hole (60c) is larger than the diameter of the internal threaded hole (60d).

4. A miniaturized cavity filter according to claim 1, characterized in that: The tuning screw (40) and / or the connector (60) are made of copper.

5. A miniaturized cavity filter according to claim 1, characterized in that: The thickness of the cover plate (20) is ≤1mm.

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