A debug cover plate and cavity filter

Abstract

This utility model discloses a tuning cover and cavity filter. The cover includes a plate with multiple through slots and multiple threaded slots. A deformation tuning part is provided on the side wall of the through slot, which is arranged opposite to the resonator. The threaded slot is arranged opposite to the coupling area between two adjacent resonators for threaded connection of tuning screws. The tuning cover is processed by using a thin plate stamping process or a local thinning process to process the through slots and deformation tuning parts, and by using hot melt drilling, stretching or burring processes to form a metal bushing before processing the threaded slots. This allows the cover thickness to be reduced to a minimum of 0.5mm, significantly reducing material usage and significantly reducing the weight and size ratio of the cover, perfectly adapting to the trend of filter miniaturization. It also makes up for the deficiency of insufficient thread count in thin plates, ensuring the locking reliability of the threaded connection, simplifying the processing steps, and effectively reducing manufacturing costs.

Description

Technical Field

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

[0002] As a key frequency selection device in modern microwave and millimeter-wave communication systems, filters effectively suppress unwanted signals and ensure the smooth transmission of useful signals. Their performance directly determines the overall quality of the communication system. Cavity filters, with their advantages of robust structure, stable and reliable performance, small size, moderate Q value, long high-end parasitic passband, and good heat dissipation, are widely used in high-power, high-frequency scenarios, and are indispensable, especially in core equipment such as communication base stations.

[0003] Traditional cavity filter tuning primarily relies on two structures: one involves pre-drilling threaded holes in the cover plate or cavity, using a tuning screw to rotate stepwise within the threaded holes, altering the termination capacitance formed between the top of the resonant rod and the cover plate, thereby adjusting the resonant frequency. Simultaneously, a coupling screw adjusts the coupling strength of adjacent resonant cavities to control the passband bandwidth. After tuning, the nut must be tightened and UV adhesive applied to prevent loosening. The other structure uses a push-button design, adjusting the distance between the button and the top surface of the resonant rod by applying pressure or tension, and using the permanent plastic deformation of the connecting ribs to fix the button position. However, existing tuning structures have several technical drawbacks: 1. In the threaded adjustment structure, the thread is directly machined on the cover plate plane. In order to ensure the thread locking effect, a certain number of thread turns must be met, which makes it difficult to reduce the thickness of the cover plate (the thinnest cover plate currently available can only reach 1.5mm). This is not conducive to the miniaturization design of the filter, and the weight, size ratio and manufacturing cost of the cover plate are relatively high. 2. The cover plate of the push-button structure needs to be made of thicker plate material. First, the plate thickness at the button area is thinned by processing the groove, and then the button pattern is processed. The processing procedure is complicated and costly. In addition, the wall thickness at the button pattern structure is relatively thin, and the deformation during debugging is inconsistent, which makes it difficult to meet the needs of mass production. 3. When the center button is pulled to a high position, the shielding paper after adjustment may come into contact with the button below, causing changes in the product waveform and potentially leading to quality issues.

[0004] These problems severely restrict the development of cavity filters in terms of miniaturization, low cost, and high consistency production. Utility Model Content

[0005] 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 debugging cover plate and a cavity filter.

[0006] The technical solution adopted by one embodiment of the present invention to solve its technical problem is: a debugging cover plate, including a plate body, on which a plurality of through grooves and a plurality of threaded grooves are provided; A deformation tuning section is provided on the side wall of the through slot, and the deformation tuning section is arranged opposite to the resonator; The threaded groove and the coupling region between the two adjacent resonators are arranged opposite each other for threaded connection of the tuning screw.

[0007] As one of the preferred embodiments of this utility model, the deformation tuning part includes a pressing part and a plurality of connecting ribs. The connecting ribs are evenly distributed on the outer periphery of the pressing part and one end is connected to the pressing part, and the other end is connected to the inner sidewall of the through groove.

[0008] As one of the preferred embodiments of this utility model, a boss is provided on the outer side of the pressing part.

[0009] As one of the preferred embodiments of this utility model, the pressing part is provided with circumferentially arranged reinforcing ribs.

[0010] In one of the preferred embodiments of this utility model, three connecting ribs are provided.

[0011] In one of the preferred embodiments of this utility model, four connecting ribs are provided.

[0012] As one of the preferred embodiments of this utility model, a shielding layer with a closed through groove is provided on the outer side of the plate.

[0013] As one of the preferred embodiments of this utility model, the shielding layer includes a partition and a shielding paper, the partition being close to the deformation tuning part, and the shielding paper being adhered to the partition and the plate.

[0014] As one of the preferred embodiments of this utility model, the partition is made of plastic.

[0015] A cavity filter, including the aforementioned cover plate.

[0016] The beneficial effects of this utility model are as follows: A tuning cover and cavity filter, the cover includes a plate body, on which multiple through slots and multiple threaded slots are provided; a deformation tuning part is provided on the side wall of the through slot, and the deformation tuning part is arranged opposite to the resonator; the threaded slot is arranged opposite to the coupling area between two adjacent resonators, and is used for threaded connection of tuning screws; the tuning cover is processed by using a thin plate stamping process or a local thinning process to process the through slots and deformation tuning parts, and by using hot melt drilling, stretching or budding processes to form a metal bushing and then processing the threaded slots, so that the thickness of the cover can be reduced to a minimum of 0.5mm, which greatly reduces the amount of material used, significantly reduces the weight and size ratio of the cover, and perfectly adapts to the miniaturization trend of filters; at the same time, it also makes up for the defect of insufficient number of threads in thin plates, ensures the locking reliability of threaded connections, simplifies the processing steps, and effectively reduces manufacturing costs. Attached Figure Description

[0017] 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 This is a top view of a cavity filter; Figure 2 for Figure 1 Cross-sectional view along the AA direction; Figure 3 for Figure 2 A magnified view of a portion of region B in the middle; Figure 4 A cross-sectional view of one embodiment of a test cover; Figure 5 for Figure 4 A magnified view of a portion of region C in the middle; Figure 6 A cross-sectional view of one embodiment of a test cover; Figure 7 for Figure 6 A magnified view of a portion of region D in the middle; Figure 8 This is a machining process diagram for the threaded groove. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Reference Figures 1-2 This utility model provides a cavity filter, including a cavity 80, a cover plate, a connector 93, and multiple resonators 60. The cavity 80 is divided into multiple resonant cavities, and the multiple resonators 60 are disposed within the resonant cavities. The cover plate covers the opening end of the cavity 80. Furthermore, the cavity 80 also includes a fly rod base 91 and a fly rod 92 disposed on the fly rod base 91. The ends of the fly rod 92 are respectively coupled to adjacent resonators 60. Further, referring to… Figures 1-2 This utility model also provides a debugging cover plate, including a plate body 10, on which a plurality of through grooves 11 and a plurality of threaded grooves 12 are provided; a deformation tuning part 20 is provided on the side wall of the through groove 11, and the deformation tuning part 20 is arranged opposite to the resonator 60; a plurality of tuning screw assemblies are provided on the cover plate, and the tuning screw assembly includes a tuning screw 71 and a tuning nut 72. The tuning screw 71 is threadedly connected in the threaded groove 12, and the tuning nut 72 is threadedly connected to the tuning screw 71 and abuts against the outer wall of the plate body 10. The lower end of the tuning screw 71 is opposite to the fly rod 91 or the fly rod 92, thereby changing the coupling strength between two adjacent resonators 60 and realizing the adjustment of the passband bandwidth.

[0023] Reference Figures 1-8 A deformation tuning part 20 is integrally formed on the side wall of the through groove 11. Preferably, the deformation tuning part 20 includes a pressing part 21 and a plurality of connecting ribs 22. The connecting ribs 22 are evenly distributed on the outer periphery of the pressing part 21, and one end of the connecting rib 22 is fixedly connected to the edge of the pressing part 21 and the other end is fixedly connected to the inner side wall of the through groove 11 to form a stable force transmission structure. The connecting ribs 22 can be set to 3 or 4 according to the actual force requirements. The even distribution ensures that the pressing part 21 can deform smoothly when subjected to force.

[0024] Reference Figures 4-5 In some embodiments, a boss 30 is integrally formed on the outer side of the pressing part 21. The boss 30 facilitates the application of pressure or tension to the pressing part 21 with the aid of tools during adjustment, thereby improving the ease of operation.

[0025] Reference Figures 6-7In some embodiments, the pressing part 21 is also provided with circumferentially arranged reinforcing ribs 40. The reinforcing ribs 40 are integrally formed with the pressing part 21, which can enhance the structural strength of the pressing part 21, avoid irregular deformation of the pressing part 21 itself during the debugging process, and ensure the debugging accuracy.

[0026] Reference Figures 2-3 In some embodiments, a shielding layer 50 is provided on the outer side of the plate 10 to close the through groove 11. Preferably, the shielding layer 50 includes a partition 51 and a shielding paper 52. The partition 51 is made of plastic and is arranged close to the deformation tuning part 20. The shielding paper 52 is fixed to the outer side of the partition 51 and the area around the through groove 11 of the plate 10 by adhesive bonding to achieve complete closure of the through groove 11. The thickness of the partition 51 is required to isolate the shielding paper 52 from contact with the pressing part 21, so as to avoid interference caused by the deformation of the pressing part 21 and ensure the stability of product performance.

[0027] The debugging cover plate of this utility model can be processed and formed through the following two core process solutions, as detailed below: Reference Figures 2-3 , Figures 6-8 Option 1: Thin plate stamping process. In this option, the plate 10 uses a thin plate with a minimum thickness of 0.5mm as the base material, and the whole is formed in one piece by stamping process.

[0028] First, multiple through slots 11 are machined on a thin plate using a stamping die. The dimensions of the through slots 11 are adapted to the structure of the deformation tuning part 20. While stamping the through slots 11, the pressing part 21 and the connecting rib 22 of the deformation tuning part 20 are formed simultaneously. The connecting rib 22 is integrally connected to the pressing part 21 and the inner wall of the through slots 11 through a stamping process. The area of ​​the connecting rib 22 is locally thinned through stamping to ensure that uniform permanent plastic deformation can be generated during debugging. The boss 30 and the circumferential reinforcing rib 40 on the pressing part 21 are also formed by stamping in one step without the need for additional processing steps.

[0029] For machining the threaded groove 12, any one of the following processes can be used: hot melt drilling, drawing, or burring. If hot melt drilling is used, refer to... Figure 8High temperatures are generated by friction between a high-speed rotating hot melt drill and the surface of the plate 10, softening the material at the location corresponding to the threaded groove 12. As the hot drill penetrates, a first bushing 121 is formed on the outer side of the plate 10, and a second bushing 122 is formed on the inner side. Simultaneously, a through groove 123 is formed on the first bushing 121, the plate 10, and the second bushing 122. The first bushing 121 is then removed using a razor, and the inner wall of the groove 123 and the lower end face of the second bushing 122 are smoothed. Finally, a threading tool is used to tap the groove 123, ultimately machining the threaded groove 12. If a stretching process is used... The process involves stretching and deforming the material at the corresponding position of the plate 10 using external force to form a metal bushing with a certain height. If a budding process is used, the pre-made holes on the plate 10 are extruded through a mold, causing the hole walls to turn upwards to form a metal bushing. After the metal bushing is formed, threads are machined inside the bushing using an extrusion tapping process to ensure that the number of thread turns meets the locking requirements and to ensure the reliability of the tuning screw 71 connection. In addition, the small plane of the pressing part 21 is sunk to a certain depth through a stamping process. This depth must be greater than the height of the pressing part 21 after maximum deformation during debugging, so as to reserve space for the subsequent installation of the shielding layer 50.

[0030] Reference Figures 4-5 Option 2: Local thinning process. In this option, the plate 10 uses a relatively thick plate as the base material.

[0031] First, a groove is machined in the area corresponding to the deformation tuning part 20 of the sheet metal to achieve local thinning of the connecting rib 22 and its surrounding area, while the central area of ​​the pressing part 21 maintains a thicker material thickness to improve the structural stability of the pressing part 21. Then, the through groove 11 is formed by stamping or machining, while the connecting rib 22 is fixedly connected to the pressing part 21 and the inner wall of the through groove 11. The boss 30 and the circumferential reinforcing rib 40 on the pressing part 21 are formed by subsequent machining or secondary stamping. The processing technology of the threaded groove 12 is the same as that of Scheme 1, that is, after forming the metal bushing by hot melt drilling, stretching or burring process, the threaded groove 12 is then machined to ensure the locking reliability of the threaded connection.

[0032] The cavity filter of this utility model includes a debugging cover plate manufactured by any of the above-mentioned process schemes. The cover plate is fixed on the filter cavity, so that the pressing part 21 of the deformation tuning part 20 is arranged opposite to the resonator 60 inside the cavity, and the threaded groove 12 is arranged opposite to the coupling area between two adjacent resonators 60. During debugging, by applying pressure or tension to the pressing part 21, the connecting rib 22 undergoes permanent plastic deformation, which drives the pressing part 21 to move up and down as a whole, changing the distance between the pressing part 21 and the resonator 60, thereby adjusting the termination capacitance value and realizing the adjustment of the resonant frequency. By rotating the tuning screw 71 in the threaded groove 12, its insertion depth is adjusted, changing the coupling strength between adjacent resonators 60, thereby realizing the adjustment of the passband bandwidth. After debugging, the partition 51 of the shielding layer 50 isolates the shielding paper 52 from contact with the pressing part 21, avoiding waveform abnormalities, and at the same time realizing signal shielding, ensuring the overall performance of the filter.

[0033] The advantages of this utility model are as follows: the adjustment cover plate is processed by using a thin plate stamping process or a local thinning process to process the through groove and the deformation tuning part, and the metal bushing is formed by hot melt drilling, stretching or budding process and then the threaded groove is processed, so that the thickness of the cover plate can be reduced to a minimum of 0.5mm, which greatly reduces the amount of material used, significantly reduces the weight and size ratio of the cover plate, and perfectly adapts to the miniaturization trend of filters; at the same time, it makes up for the defect of insufficient number of threads in thin plates, ensures the locking reliability of threaded connection, simplifies the processing process, and effectively reduces manufacturing costs.

[0034] 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 test cover, characterized in that: Includes a plate (10), on which a plurality of through grooves (11) and a plurality of threaded grooves (12) are provided; A deformation tuning part (20) is provided on the side wall of the through groove (11), and the deformation tuning part (20) is arranged opposite to the resonator (60); The threaded groove (12) is arranged opposite to the coupling region between the two adjacent resonators (60) for threaded connection of the tuning screw (71).

2. The debugging cover plate according to claim 1, characterized in that: The deformation tuning part (20) includes a pressing part (21) and a plurality of connecting ribs (22). The connecting ribs (22) are evenly distributed on the outer periphery of the pressing part (21) and one end is connected to the pressing part (21), and the other end is connected to the inner sidewall of the through groove (11).

3. The debugging cover plate according to claim 2, characterized in that: A boss (30) is provided on the outer side of the pressing part (21).

4. A test cover plate according to claim 2, characterized in that: The pressing part (21) is provided with circumferentially arranged reinforcing ribs (40).

5. A test cover plate according to claim 2, characterized in that: The connecting ribs (22) are set to 3.

6. A test cover plate according to claim 2, characterized in that: The connecting ribs (22) are set to 4.

7. A test cover plate according to claim 1, characterized in that: The outer side of the plate (10) is provided with a shielding layer (50) that closes the through groove (11).

8. A test cover plate according to claim 7, characterized in that: The shielding layer (50) includes a partition (51) and a shielding paper (52), the partition (51) being close to the deformation tuning part (20), and the shielding paper (52) being bonded to the partition (51) and the plate (10).

9. A test cover plate according to claim 8, characterized in that: The partition (51) is made of plastic.

10. A cavity filter, characterized in that: Includes the cover plate as described in any one of claims 1-9.

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