A cavity filter having a thin cover plate

Abstract

The utility model discloses a cavity filter with thin cover plate, including cavity, cover plate, resonator, tuning screw rod and tuning nut, resonator sets up in the cavity, cover plate sets up at the opening of cavity, still include the boss of setting in the inside of cover plate, is provided with the thread groove of inside and outside through in cover plate and boss, and tuning screw rod is screwed into the thread groove, and tuning nut is screwed on tuning screw rod and with the outside abutment of cover plate, through above -mentioned structure makes the thickness of cover plate can reduce greatly, reaches the purpose of reducing weight and reducing the cost, has very good practicality.

Description

Technical Field

[0001] This utility model relates to the field of filters, and in particular to a cavity filter with a thin cover plate. 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 the cavity filter. Therefore, a cavity filter with a thin cover plate 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 cavity filter with a thin cover plate.

[0004] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a cavity filter with a thin cover plate, 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 boss is disposed on the inner side of the cover plate. The cover plate and the boss are provided with threaded grooves that are internally and externally connected. The tuning screw is threadedly connected to the threaded groove, and the tuning nut is threadedly connected to the tuning screw and abuts against the outer side of the cover plate.

[0005] As one of the preferred embodiments of this utility model, the boss is formed when a through hole is machined into the cover plate using a hot melt drill bit.

[0006] As one of the preferred embodiments of this utility model, the boss and the cover plate are integrally formed.

[0007] As one of the preferred embodiments of this utility model, the boss is in the shape of an inverted frustum.

[0008] As one of the preferred embodiments of this utility model, the thickness of the cover plate is ≤1.2mm.

[0009] The beneficial effects of this utility model are as follows: A cavity filter with a thin cover plate 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 boss disposed on the inner side of the cover plate. The cover plate and the boss are provided with threaded grooves that extend through the inside and outside. The tuning screw is threaded into the threaded grooves, and the tuning nut is threaded into the tuning screw and abuts against the outer side of the cover plate. Through the above structure, the thickness of the cover plate can be greatly reduced, achieving the purpose of weight reduction and cost reduction, and has very good 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 cavity filter with a thin cover plate; Figure 2 This is a schematic diagram showing the machining of the cover plate, boss, and threaded groove; Figure 3 This is a cross-sectional view of a cavity filter with a thin 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 cavity filter with a thin cover plate 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 boss 60 disposed on the inner side of the cover plate 20. The cover plate 20 and the boss 60 are provided with threaded grooves 70 that are internally and externally connected. The tuning screw 40 is threaded into the threaded groove 70, and the tuning nut 50 is threaded into the tuning screw 40 and abuts against the outer side of the cover plate 20.

[0016] In this utility model, the processing steps of the boss 60 and the threaded groove 70 are as follows: 1. Use a hot melt drill bit to perform hot melt drilling on the cover plate 20, which will form a first overflow platform 61 on the outer side of the cover plate 20, a second overflow platform 62 on the inner side of the cover plate 20, and a through hole 63 on the first overflow platform 61, the cover plate 20 and the second overflow platform 62; 2. Use a razor to remove the first overflow platform 61 and to cut the inner wall of the through hole 63 neatly; 3. Use a threading tool to drill threads in the through hole 63; that is, the boss 60 is formed when the hot melt drill bit processes the through hole in the cover plate 20, and finally the boss 60 is constructed on the inner side of the cover plate 20 and the threaded groove 70 is constructed on the cover plate 20 and the boss 60. In this embodiment, the boss 60 and the cover plate 20 are integrally formed.

[0017] During debugging, first connect the tuning screw 40 to the threaded groove 70, then connect the tuning nut 50 to the tuning screw 40. Connect the filter to the vector network analyzer and repeatedly tighten the tuning screw 40 according to the changes in the graph until the performance of the filter meets the design requirements. Then tighten the tuning nut 50 until it abuts against the outside of the cover plate 20 and is tightened.

[0018] Reference Figures 1-3 The boss 60 is in the shape of an inverted frustum, which can reduce the amount of material used while ensuring the connection strength, and further reduce the weight of the cover plate 20.

[0019] Reference Figures 1-3 The thickness of the cover plate 20 can be reduced to ≤1.2mm, and the weight can be reduced by more than 50%.

[0020] The advantages of this utility model are: the thickness of the cover plate can be greatly reduced through the above structure, thereby achieving the purpose of weight reduction and cost reduction, and it has very good practicality.

[0021] 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 cavity filter with a thin cover plate, 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 boss (60) provided on the inner side of the cover plate (20), and the cover plate (20) and the boss (60) are provided with threaded grooves (70) that pass through the inside and outside. The tuning screw (40) is threadedly connected to the threaded groove (70), and the tuning nut (50) is threadedly connected to the tuning screw (40) and abuts against the outer side of the cover plate (20).

2. A cavity filter with a thin cover plate according to claim 1, characterized in that: The boss (60) is formed when a through hole is machined into the cover plate (20) by a hot melt drill bit.

3. A cavity filter with a thin cover plate according to claim 1, characterized in that: The boss (60) and the cover plate (20) are integrally formed.

4. A cavity filter with a thin cover plate according to claim 1, characterized in that: The boss (60) is in the shape of an inverted frustum.

5. A cavity filter with a thin cover plate according to claim 1, characterized in that: The thickness of the cover plate (20) is ≤1.2mm.

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