Cavity filter

Abstract

The cavity filter comprises a sealed cavity, a resonator, an outward tuning member and a driving member, the sealed cavity is provided with a deformation part, the deformation part is easy to deform, the resonator is located in the sealed cavity and is connected with the deformation part, so that when the deformation part deforms, the resonator can be driven to move synchronously, and the outward tuning member is connected with the deformation part. The driving part is in threaded connection with the outward tuning part and is connected with the sealing cavity, and the driving part drives the deformation part to deform towards the outer side of the sealing cavity, so that the resonator connected to the deformation part can be driven to move, frequency modulation of the filter is achieved, no metal chippings fall into the sealing cavity in the frequency modulation process, frequency modulation of the filter is facilitated, and the frequency modulation efficiency of the filter is improved. The frequency modulation precision of the filter is improved.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a cavity filter. Background Technology

[0002] Cavity filters, as frequency selection devices, are widely used in the field of communications, especially in radio frequency communications. In base stations, filters are used to select communication signals and filter out noise or interference signals outside the communication signal frequency. Before a filter is put into use, the filtering frequency needs to be adjusted.

[0003] The cavity filter disclosed in CN2209714U includes a metal cavity, a resonant rod, and a cover plate. The metal cavity includes a bottom wall, side walls, and a cavity between the bottom wall and the side walls. The cover plate is placed on the metal cavity. The resonant rod is welded to the bottom wall. The resonant rod is firmly welded, has a simple structure, is easy to install, and is conducive to automated installation design. The cavity filter is also equipped with an adjustment rod, which is inserted into the threaded hole of the cover plate and can adjust the length of the rod extending downward into the resonant rod for frequency tuning.

[0004] Because of the friction between the screw and the cover plate, existing filters are prone to generating debris that falls into the cavity during frequency modulation, affecting the frequency modulation of the filter and reducing its frequency modulation accuracy. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a cavity filter to solve the technical problem that metal debris easily falls into the cavity during the frequency modulation process of the existing cavity filter, affecting the frequency modulation of the filter.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a cavity filter, comprising:

[0008] A sealed cavity with a deformable section;

[0009] A resonator is located in the sealed cavity and installed in the deformation part. A flange is provided at the end of the resonator away from the deformation part. The distance between the flange and the inner wall of the sealed cavity can be adjusted by the deformation of the deformation part.

[0010] An outward-facing tuning element is connected to the deformable portion; and

[0011] A driving component, connecting the sealing cavity and the sealing cavity, is used to drive the deformable part to deform outward from the sealing cavity.

[0012] In some embodiments, the outward tuning member is fixed to the deformation portion, the driving member abuts against the sealed cavity, and can be rotated to drive the outward tuning member to move towards the outside of the sealed cavity.

[0013] In some embodiments, the deformable part is provided with a connecting hole, and the end of the outward tuning member is provided with a connecting protrusion, the connecting protrusion being fixedly inserted into the connecting hole.

[0014] In some embodiments, the deformable portion is provided with a connecting post that extends toward the inside of the sealing cavity, and the connecting hole extends into the interior of the connecting post.

[0015] In some embodiments, the sealed cavity includes a cavity and a cover plate, the cover plate covering the cavity, and the deformable portion disposed on the cover plate or the side of the cavity opposite to the cover plate.

[0016] In some embodiments, the deformable portion is provided with a fastener, which is connected to the resonator to fix the resonator.

[0017] In some embodiments, the fastener is a threaded component and is threadedly connected to the resonator or the deformable part.

[0018] In some embodiments, the deformable portion is disposed on the cover plate, and the fastener passes through the deformable portion and is threadedly connected to the resonator.

[0019] In some embodiments, the outward tuning element is fixedly sleeved on the fastener.

[0020] In some embodiments, the deformable portion is disposed on one side of the cavity opposite to the cover plate, and the fastener passes through the resonator and is threadedly connected to the deformable portion.

[0021] Compared with the prior art, the cavity filter provided by this utility model includes a sealed cavity, a resonator, an outward tuning element, and a driving element. The sealed cavity has a deformable part that is easy to deform. The resonator is located inside the sealed cavity and connected to the deformable part, so that when the deformable part deforms, it can drive the resonator to move synchronously. The outward tuning element is connected to the deformable part, and the driving element is connected to the outward tuning element and the sealed cavity. The driving element drives the outward tuning element to move outward in the direction of the sealed cavity, thereby causing the deformable part to deform outward in the direction of the sealed cavity, which can further drive the resonator connected to the deformable part to move, realizing the frequency modulation of the filter. Moreover, it prevents metal debris from falling into the sealed cavity during the frequency modulation process, which facilitates the frequency modulation of the filter and improves the frequency modulation accuracy of the filter. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the cavity filter structure provided in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Front view of a medium frequency modulation filter;

[0024] Figure 3 It is along Figure 2 Sectional view of line AA in the middle;

[0025] Figure 4 This is a schematic diagram of the cavity filter structure provided in another embodiment of the present invention;

[0026] Figure 5 yes Figure 4 Front view of a medium frequency modulation filter;

[0027] Figure 6 It is along Figure 5 Sectional view along line AA in the middle.

[0028] Labels for each item in the figure:

[0029] 10—Sealed cavity; 11—Deformation section; 12—Cavity

[0030] 13—Cover plate; 20—Resonator; 30—Outward tuning element

[0031] 31—Connecting protrusion; 40—Drive component; 50—Fastener

[0032] 111—Connecting hole; 112—Connecting post. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] To address the technical problem in existing technologies where metal debris easily falls into the cavity during the frequency modulation process of filters, affecting the frequency modulation of the filter, this utility model embodiment uses a resonator to move to perform filter frequency modulation, thereby avoiding debris during the frequency modulation process and facilitating filter frequency modulation.

[0035] The cavity filter of this utility model embodiment, such as Figure 1-6As shown, the device includes a sealed cavity 10, a resonator 20, an outward tuning element 30, and a driving element 40. The sealed cavity 10 has a deformation section 11. The resonator 20 is located inside the sealed cavity 10 and installed on the deformation section 11. A flange is provided at the end of the resonator 20 away from the deformation section 11. The flange can adjust the distance between itself and the inner wall of the sealed cavity 10 by the deformation of the deformation section 11. The outward tuning element 30 is connected to the deformation section 11. The driving element 40 is connected to the outward tuning element 30 and the sealed cavity 10 and is used to drive the deformation section 11 to deform in the direction of the outer side of the sealed cavity 10.

[0036] Specifically, the cavity filter comprises a sealed cavity 10, a resonator 20, an outward tuning element 30, and a driving element 40. The sealed cavity 10 has a deformable part 11, which is easily deformable. The resonator 20 is located inside the sealed cavity 10 and connected to the deformable part 11, so that when the deformable part 11 deforms, it can drive the resonator 20 to move synchronously. The outward tuning element 30 is connected to the deformable part 11, and the driving element 40 is threadedly connected to the outward tuning element 30 and the sealed cavity 10. The driving element 40 drives the outward tuning element 30 to move outward in the direction of the sealed cavity 10, thereby driving the deformable part 11 to further deform outward in the direction of the sealed cavity 10, thereby driving the resonator 20 connected to the deformable part 11 to move and adjusting the distance between the flange and the inner wall of the sealed cavity 10 to achieve frequency modulation of the filter. Since no metal debris falls into the sealed cavity 10 during the frequency modulation process, the frequency modulation of the filter is convenient and the frequency modulation accuracy of the filter is improved.

[0037] In this embodiment, the deformable part 11 is part of the sealed cavity 10. The sealed cavity 10 encloses and forms a cavity structure. The direction towards the outer side of the sealed cavity 10 is the opposite direction towards the inner cavity of the sealed cavity 10.

[0038] In this embodiment, as Figure 1-6 As shown, the sealed cavity 10 includes a cavity 12 and a cover plate 13, with the cover plate 13 covering the cavity 12 to form the sealed cavity 10 structure.

[0039] Understandably, the deformable part 11 can be provided at any part of the sealed cavity 10, and it only needs to be deformed toward the sealed cavity 10 by the drive of the outward tuning member 30. The deformable part 11 can be made easy to deform under the pressure of the inward tuning unit 30 by means of making it a deformable material or thinning it.

[0040] Understandably, the deformation part 11 is thinned so that it is easy to deform under external force, while the parts other than the deformation part 11 will not deform.

[0041] In one embodiment, such as Figure 3 and 6As shown, the deformation part 11 is disposed on the side of the cover plate 13 or the cavity 12 opposite to the cover plate 13. Specifically, when the deformation part 11 is disposed on the cover plate 13, the outward tuning member 30 drives the deformation part 11 to deform in the direction of the outer side of the sealed cavity 10, which can increase the distance between the resonator 20 and the bottom wall of the cavity 12, thereby realizing frequency modulation; when the deformation part 11 is disposed on the side of the cavity 12 opposite to the cover plate 13, the outward tuning member 30 drives the deformation part 11 to deform in the direction of the outer side of the sealed cavity 10, which can increase the distance between the resonator 20 and the cover plate 13, thereby realizing frequency modulation.

[0042] Understandably, the driving member 40 can be a connecting rod with one end hinged to the outward tuning member 30 and the other end slidably connected to the sealing cavity 10. By driving the connecting rod to slide along the sealing cavity 10 toward the outward tuning member 30, the outward tuning member 30 can be driven to move toward the outside of the sealing cavity 10.

[0043] Understandably, the drive component 40 can be fixedly connected to the sealed cavity 10 by means of integral molding or other methods. In this state, one end of the outward tuning component 30 is threaded to the drive component 40, and the other end is rotatably connected to the deformation part 11 through a convex ring. When the cavity filter is being tuned, by controlling the rotation of the outward tuning component 30, the drive component 40 can drive the outward tuning component 30 to move towards the outside of the sealed cavity 10, thereby causing the deformation part 11 to deform towards the outside of the sealed cavity 10.

[0044] In one embodiment, such as Figure 3 and 6 As shown, the outward tuning element 30 is fixed to the deformation part 11, and the driving element 40 is threadedly connected to the outward tuning element 30 and abuts against the sealing cavity 10. It can be rotated to move the outward tuning element 30 towards the outside of the sealing cavity 10. Specifically, because the driving element 40 abuts against the sealing cavity 10 and is threadedly connected to the outward tuning element 30, during the rotation of the driving element 40, a reverse force is generated acting on the outward tuning element 30, driving the outward tuning element 30 to move axially towards the outside of the sealing cavity 10. This, in turn, causes the deformation part 11 to deform axially towards the outside of the sealing cavity 10, thereby achieving frequency modulation.

[0045] In this embodiment, the driving component 40 is a nut.

[0046] In one embodiment, such as Figure 3 As shown, the deformable part 11 is provided with a connecting hole 111, and the end of the outward tuning member 30 is provided with a connecting protrusion 31, which is fixedly inserted into the connecting hole 111. Specifically, the outward tuning member 30 is inserted into the connecting hole 111 of the deformable part 11 through the connecting protrusion 31 at its end, thereby fixing the outward tuning member 30 and the deformable part 11.

[0047] In this embodiment, as Figure 3 As shown, the fixing method of the outward tuning member 30, which is fixed to the deformation part 11 by setting the connecting protrusion 31, is mainly applicable to the case where the deformation part 11 is set on the side of the cavity 12 opposite to the cover plate 13.

[0048] In one embodiment, such as Figure 3 As shown, the deformable part 11 is provided with a connecting post 112, which extends toward the inside of the sealing cavity 10, and the connecting hole 111 extends into the interior of the connecting post 112. Specifically, the connecting post 112 increases the depth of the connecting hole 111, thereby strengthening the connection between the outward tuning member 30 and the deformable part 11.

[0049] In this embodiment, as Figure 3 As shown, the resonator 20 is connected to the end of the connecting post 112.

[0050] In one embodiment, such as Figure 3 and 6 As shown, the deformable part 11 is provided with a fastener 50, which is connected to the resonator 20 to fix the resonator 20. Specifically, the resonator 20 is fixedly connected to the deformable part 11 by the fastener 50.

[0051] In one embodiment, the fastener 50 is a threaded component and is threadedly connected to the resonator 20 or the deformation portion 11. Specifically, the fastener 50 fixes the resonator 20 by passing through the deformation portion 11 and being threadedly connected to the resonator 20; or it fixes the resonator 20 by passing through the resonator 20 and being threadedly connected to the deformation portion 11.

[0052] In one embodiment, such as Figure 1-3 As shown, the deformation part 11 is disposed on the side of the cavity 12 opposite to the cover plate 13, and the fastener 50 passes through the resonator 20 and is threadedly connected to the deformation part 11. Specifically, this arrangement facilitates the assembly of the filter.

[0053] In this embodiment, when the deformable part 11 is disposed on the side of the cavity 12 opposite to the cover plate 13, the fastener 50 passes through the resonator 20 and is threadedly connected to the connecting post 112 of the deformable part 11, thus fixing the resonator 20 to the connecting post 112. With this structure, when assembling the filter, first align the resonator 20 with the connecting post 112, then pass the fastener 50 through the resonator 20 and thread it to the connecting post 112 to fix the resonator 20, then cover it with the cover plate 13, then insert the outward tuning member 30 connected to the driving member 40 into the connecting hole 111 through the connecting protrusion 31 at the end, and then screw the driving member 40 so that the driving member 40 abuts against the cavity 12, thus completing the assembly of the filter, providing convenience for filter assembly.

[0054] In one embodiment, such as Figure 4-6 As shown, the deformation part 11 is disposed on the cover plate 13, and the fastener 50 passes through the deformation part 11 and is threadedly connected to the resonator 20. Specifically, when the deformation part 11 is disposed on the cover plate 13, the outward tuning member 30 will be connected to the cover plate 13, and the fastener 50 passes through the deformation part 11 and is threadedly connected to the resonator 20, which can fix the resonator 20, and make the end of the fastener 50 protrude from the deformation part 11. When the outward tuning member 30 is fixedly connected to the end of the fastener 50, it can be fixed to the deformation part 11, thereby simplifying the structure of the filter.

[0055] In one embodiment, such as Figure 6 As shown, the outward tuning component 30 is fixedly sleeved on the fastener 50. Specifically, with this structure, when the deformable part 11 is set on the cover plate 13, during the filter assembly process, the resonator 20 is first aligned with the through hole of the deformable part 11 of the cover plate 13, then the fastener 50 is passed through the through hole of the deformable part 11 and threaded to the resonator 20, then the cover plate 13 is placed on the cavity 12, then the outward tuning component 30 connected with the driving component 40 is sleeved at the end of the fastener 50, and then the driving component 40 is screwed to make the driving component 40 abut against the cover plate 13, thus completing the filter assembly and providing convenience for filter assembly.

[0056] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A cavity filter, characterized in that, include: A sealed cavity with a deformable section; A resonator is located in the sealed cavity and installed in the deformation part. A flange is provided at the end of the resonator away from the deformation part. The distance between the flange and the inner wall of the sealed cavity can be adjusted by the deformation of the deformation part. An outward-facing tuning element is connected to the deformable part; and A driving component, connecting the sealed cavity and the outward tuning component, is used to drive the deformable part to deform outward from the sealed cavity.

2. The cavity filter according to claim 1, characterized in that, The outward tuning component is fixed to the deformation part, and the driving component is threadedly connected to the outward tuning component and abuts against the sealing cavity. The driving component can rotate to drive the outward tuning component to move towards the outside of the sealing cavity.

3. The cavity filter according to claim 1, characterized in that, The deformable part is provided with a connecting hole, and the end of the outward tuning member is provided with a connecting protrusion, which is fixedly inserted into the connecting hole.

4. The cavity filter according to claim 3, characterized in that, The deformable part is provided with a connecting post, which extends toward the inside of the sealed cavity, and the connecting hole extends into the interior of the connecting post.

5. The cavity filter according to any one of claims 1-4, characterized in that, The sealed cavity includes a cavity and a cover plate, the cover plate is disposed on the cavity, and the deformable part is disposed on the cover plate or the side of the cavity opposite to the cover plate.

6. The cavity filter according to claim 5, characterized in that, The deformable part is provided with a fastener, which is connected to the resonator.

7. The cavity filter according to claim 6, characterized in that, The fastener is a threaded component and is threadedly connected to the resonator or the deformable part.

8. The cavity filter according to claim 6, characterized in that, The deformable part is disposed on the cover plate, and the fastener passes through the deformable part and is threadedly connected to the resonator.

9. The cavity filter according to claim 6, characterized in that, The outward tuning element is fixedly sleeved on the fastener.

10. The cavity filter according to claim 6, characterized in that, The deformable part is disposed on the side of the cavity opposite to the cover plate, and the fastener passes through the resonator and is threadedly connected to the deformable part.

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