Frequency modulation filter

Abstract

The utility model discloses a frequency modulation filter, which comprises a sealed cavity, a resonator and an inward frequency modulation unit, the sealed cavity is provided with a deformation part, the deformation part is easy to deform, the resonator is positioned in the sealed cavity and is connected with the deformation part, and the inward frequency modulation unit abuts against the deformation part. And the inward frequency modulation unit drives the deformation part to deform towards the inner side of the sealed cavity so as to drive the resonator connected to the deformation part to move, so that frequency modulation of the filter is realized, and frequency modulation of the frequency modulation filter is realized through driving deformation of the deformation part by the inward frequency modulation unit. Therefore, no metal chips fall into the sealed cavity in the frequency modulation process, and the frequency modulation of the filter is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a frequency modulation 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] For example, the cavity filter with announcement number CN2034452U mainly includes a cavity, a cover plate, a resonant rod, and a tuning screw. The resonant rod is fixed inside the cavity, and the tuning screw is threaded to the cover plate and extends into the cavity. By turning the tuning screw, the distance between the resonant rod and the tuning screw can be adjusted, thereby tuning the frequency of the filter.

[0004] Although existing filters can be tuned by controlling the tuning screw, metal debris can easily fall into the cavity during the process of turning the tuning screw, affecting the frequency tuning of the filter. Utility Model Content

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

[0008] A sealed cavity with a deformable section;

[0009] A resonator, located within the sealed cavity and mounted on the deformable portion, has a flange at its end away from the deformable portion. The flange's distance from the inner wall of the sealed cavity can be adjusted by the deformation of the deformable portion.

[0010] An inward frequency modulation unit abuts against the deformable part and is used to drive the deformable part to deform toward the inside of the sealed cavity.

[0011] In some embodiments, the inward frequency modulation unit includes a tuning element connected to the sealed cavity and abutting against the deformable portion, the tuning element pressing the deformable portion by moving toward the inner side of the sealed cavity.

[0012] In some embodiments, the tuning element is threadedly connected to the sealed cavity.

[0013] In some embodiments, the surface of the sealing cavity is provided with a threaded connection port, the threaded connection port is located on one side of the deformable part and is connected to the deformable part, and the tuning element is threadedly connected to the side wall of the threaded connection port.

[0014] 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.

[0015] In some embodiments, the frequency modulation filter further includes a fastener that connects the deformable portion and the resonator to secure the resonator.

[0016] In some embodiments, the deformation portion is disposed on the cover plate, one end of the fastener is located inside the inward frequency modulation unit, and the other end of the fastener passes through the deformation portion and is connected to the resonator.

[0017] In some embodiments, the fastener is threadedly connected to the resonator.

[0018] In some embodiments, the deformable portion is disposed on one side of the cavity opposite to the cover plate, one end of the fastener is located inside the resonator, and the other end of the fastener passes through the resonator and is connected to the deformable portion.

[0019] In some embodiments, the deformable portion is provided with a threaded connecting post that extends toward the cover plate, the resonator is disposed at the end of the threaded connecting post, and the fastener passes through the resonator and is threadedly connected to the threaded connecting post.

[0020] Compared with the prior art, the frequency modulation filter provided by this utility model includes a sealed cavity, a resonator, and an inward frequency modulation unit. 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. The inward frequency modulation unit abuts against the deformable part. When the frequency modulation filter is in operation, the inward frequency modulation unit drives the deformable part to deform inward towards the inside of the sealed cavity, thereby moving the resonator connected to the deformable part and realizing the frequency modulation of the filter. Since the frequency modulation of the frequency modulation filter is achieved by the deformation of the deformable part driven by the inward frequency modulation unit, no metal debris will fall into the sealed cavity during the frequency modulation process, thus facilitating the frequency modulation of the filter. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the frequency modulation filter provided in this embodiment of the utility model;

[0022] Figure 2 yes Figure 1Front view of a medium frequency modulation filter;

[0023] Figure 3 It is along Figure 2 Sectional view of line AA in the middle;

[0024] Figure 4 This is a schematic diagram of the structure of a frequency modulation filter provided in another embodiment of the present invention;

[0025] Figure 5 yes Figure 4 Front view of a medium frequency modulation filter;

[0026] Figure 6 It is along Figure 5 Sectional view along line AA in the middle.

[0027] Labels for each item in the figure:

[0028] 10—Sealed cavity; 11—Deformation section; 12—Threaded connection port

[0029] 13—Cavity 14—Cover 20—Resonator

[0030] 30—Inward frequency modulation unit; 31—Tuning element; 40—Fastener

[0031] 111—Threaded connection post. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] The frequency modulation filter provided in this embodiment of the utility model, such as Figure 1-6 As shown, the device includes a sealed cavity 10, a resonator 20, and an inward frequency modulation unit 30. 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 inward frequency modulation unit 30 abuts against the deformation section 11 and is used to drive the deformation section 11 to deform toward the inside of the sealed cavity 10.

[0035] Specifically, the frequency modulation filter comprises a sealed cavity 10, a resonator 20, and an inward frequency modulation unit 30. 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. The inward frequency modulation unit 30 abuts against the deformable part 11. When the frequency modulation filter is in operation, the inward frequency modulation unit 30 drives the deformable part 11 to deform inward toward the inside of the sealed cavity 10, thereby moving the resonator 20 connected to the deformable part 11 and adjusting the distance between the flange and the inner wall of the sealed cavity 10 to achieve frequency modulation of the filter. Since the frequency modulation of the frequency modulation filter is achieved by the deformation of the deformable part 11 driven by the inward frequency modulation unit 30, no metal debris will fall into the sealed cavity 10 during the frequency modulation process, thus facilitating the frequency modulation of the filter.

[0036] 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 toward the inside of the sealed cavity 10 is the direction toward the internal cavity of the sealed cavity 10.

[0037] In this embodiment, the sealed cavity 10 includes a cavity 13 and a cover plate 14, with the cover plate 14 covering the cavity 13 to form the sealed cavity 10 structure.

[0038] Understandably, the deformable part 11 can be located at any part of the sealed cavity 10, and can be deformed toward the sealed cavity 10 by the drive of the inward frequency modulation unit 30. The deformable part 11 can be made easy to deform under the pressure of the inward frequency modulation unit 30 by means of making it a deformable material or thinning it.

[0039] In this embodiment, the deformable part 11 is thinned so that its thickness is less than that of other parts of the sealed cavity 10, making it easier for this part to deform under external force, while other parts other than the deformable part 11 will not deform.

[0040] In one embodiment, such as Figure 1-6 As shown, the sealed cavity 10 includes a cavity 13 and a cover plate 14. The cover plate 14 covers the cavity 13, and the deformation part 11 is disposed on the cover plate 14 or the side of the cavity 13 opposite to the cover plate 14. Specifically, when the deformation part 11 is disposed on the cover plate 14, when the deformation part 11 is driven to deform inward toward the sealed cavity 10, the distance between the resonator 20 and the bottom wall of the cavity 13 can be reduced, thereby achieving frequency modulation; when the deformation part 11 is disposed on the side of the cavity 13 opposite to the cover plate 14, when the deformation part 11 is driven to deform inward toward the sealed cavity 10, the distance between the resonator 20 and the cover plate 14 can be reduced, thereby achieving frequency modulation.

[0041] Understandably, the inward frequency modulation unit 30 can be a rod that abuts against the deformable part 11, and the rod structure presses against the deformable part 11 to drive the deformable part 11 to deform toward the inside of the sealing cavity 10, or it can be a threaded rod that is threaded to the sealing cavity 10, and the deformable part 11 is driven to deform during the twisting process by the abutting of the end of the threaded rod against the deformable part 11.

[0042] In one embodiment, such as Figure 1 , 3 As shown in Figure 6, the inward frequency modulation unit 30 includes a tuning element 31, which is connected to the sealed cavity 10 and abuts against the deformation part 11. The tuning element 31 can press the deformation part 11 by moving inward toward the sealed cavity 10. Specifically, when the tuning element 31 moves inward toward the sealed cavity 10, it presses the deformation part 11, thereby causing the deformation part 11 to deform and achieving frequency modulation of the filter. The tuning element 31 is connected to the sealed cavity 10, and after frequency modulation, it is limited by the sealed cavity 10, thereby preventing the deformation part 11 from resetting and ensuring the stability of the filter frequency.

[0043] Understandably, the tuning element 31 can be connected to the sealing cavity 10 by means of interference fit or snap-fit.

[0044] In one embodiment, such as Figure 3 and 6 As shown, the tuning element 31 is threadedly connected to the sealed cavity 10. Specifically, the tuning element 31 is threadedly connected to the sealed cavity 10. When adjusting the frequency of the filter, it is only necessary to use an adjustment tool to turn the tuning element 31 so that the tuning element 31 moves toward the deformation part 11, thereby driving the deformation part 11 to deform toward the inside of the sealed cavity 10.

[0045] In this embodiment, the sealing cavity 10 can be connected to the sealing cavity 10 by providing a threaded connection part opposite to the deformable part 11, and the tuning member 31 can be threadedly connected to the threaded connection part.

[0046] In one embodiment, such as Figure 3 and 6 As shown, the surface of the sealing cavity 10 is provided with a threaded connection port 12. The threaded connection port 12 is located on one side of the deformable part 11 and is connected to the deformable part 11. The tuning member 31 is threadedly connected to the side wall of the threaded connection port 12. Specifically, the deformable part 11 is thinned to form a groove structure in the thinned area. By further processing the side wall structure of the groove to form a threaded structure for the tuning member 31 to be threadedly connected, the aforementioned threaded connection port 12 can be formed. With the provision of the threaded connection port 12, it is not necessary to separately provide a connection part for the tuning member 31 to be threadedly connected in the sealing cavity 10, thereby simplifying the structure of the sealing cavity 10.

[0047] Understandably, the resonator 20 can be integrally formed on the deformation part 11, or connected to the deformation part 11 by means of threaded connection or other means.

[0048] In one embodiment, such as Figure 3 and 6 As shown, the frequency modulation filter also includes a fastener 40, which connects the deformation part 11 and the resonator 20 to fix the resonator 20. Specifically, the resonator 20 can be fixed to the deformation part 11 by the fastener 40 to ensure the stability of the resonator 20, so that the resonator 20 can move synchronously with the deformation part 11 toward the inside of the sealed cavity 10 as it deforms.

[0049] In one embodiment, such as Figure 3 As shown, the deformation part 11 is disposed on the cover plate 14, one end of the fastener 40 is located inside the inward frequency modulation unit 30, and the other end of the fastener 40 passes through the deformation part 11 and is connected to the resonator 20. Specifically, by being disposed on the cover plate 14, the deformation part 11 deforms towards the bottom wall of the cavity 13, thereby reducing the distance between the resonator 20 and the bottom wall of the cavity 13, thus achieving frequency modulation; when assembling the filter, it is only necessary to first fix the resonator 20 to the thinned deformation part with the fastener 40, then cover the cavity 13 with the cover plate 14, and finally screw in the tuning component 31.

[0050] Understandably, fastener 40 can be connected to resonator 20 by means of interference fit, snap-fit, etc.

[0051] In one embodiment, such as Figure 3 As shown, the fastener 40 is threadedly connected to the resonator 20. Specifically, the fastener 40 is threadedly connected to the resonator 20 to fasten the resonator 20. When installing the resonator 20, first align the resonator 20 with the connection hole of the deformation part 11, then pass the fastener 40 through the connection hole of the deformation part 11, and then thread it onto the resonator 20.

[0052] In this embodiment, the fastener 40 is a screw.

[0053] In one embodiment, such as Figure 6As shown, the deformation part 11 is disposed on the side of the cavity 13 opposite to the cover plate 14. One end of the fastener 40 is located inside the resonator 20, and the other end of the fastener 40 passes through the resonator 20 and is connected to the deformation part 11. Specifically, the side of the cavity 13 opposite to the cover plate 14 is the bottom wall of the cavity 13. By being disposed on the bottom wall of the cavity 13, when the deformation part 11 deforms towards the cover plate 14 of the cavity 13, the distance between the resonator 20 and the cover plate 14 will be reduced, thereby achieving frequency modulation. When assembling the filter, first install the resonator 20 inside the cavity 13 and align it with the connection hole of the deformation part 11. Then, pass the fastener 40 through the resonator 20 and connect it to the deformation part 11 to lock the resonator 20. Finally, close the cover.

[0054] In one embodiment, such as Figure 6 As shown, the deformable part 11 is provided with a threaded connecting post 111, which extends toward the cover plate 14. The resonator 20 is disposed at the end of the connecting post, and the fastener 40 passes through the resonator 20 and is threadedly connected to the threaded connecting post 111. Specifically, the fastener 40 is threadedly connected to the deformable part 11 to fasten the resonator 20. When installing the resonator 20, the through hole of the resonator 20 is aligned with the threaded connecting hole 111 of the connecting post, and then the fastener 40 is installed inside the resonator 20 to lock the resonator 20.

[0055] 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 frequency modulation 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. and An inward frequency modulation unit abuts against the deformable part and is used to drive the deformable part to deform toward the inside of the sealed cavity.

2. The frequency modulation filter according to claim 1, characterized in that, The inward frequency modulation unit includes a tuning element connected to the sealed cavity and abutting against the deformable part. The tuning element can press the deformable part by moving towards the inner side of the sealed cavity.

3. The frequency modulation filter according to claim 2, characterized in that, The tuning element is threadedly connected to the sealed cavity.

4. The frequency modulation filter according to claim 2, characterized in that, The surface of the sealed cavity is provided with a threaded connection port, which is located on one side of the deformable part and is connected to the deformable part. The tuning component is threadedly connected to the threaded connection port.

5. The frequency modulation 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 frequency modulation filter according to claim 5, characterized in that, The frequency modulation filter also includes a fastener that connects the deformable part and the resonator to fix the resonator.

7. The frequency modulation filter according to claim 6, characterized in that, The deformation part is disposed on the cover plate, one end of the fastener is located inside the inward frequency modulation unit, and the other end of the fastener passes through the deformation part and is connected to the resonator.

8. The frequency modulation filter according to claim 7, characterized in that, The fastener is threadedly connected to the resonator.

9. The frequency modulation filter according to claim 6, characterized in that, The deformable part is disposed on the side of the cavity opposite to the cover plate, one end of the fastener is located inside the resonator, and the other end of the fastener passes through the resonator and is connected to the deformable part.

10. The frequency modulation filter according to claim 8, characterized in that, The deformable part is provided with a threaded connecting post, which extends toward the cover plate. The resonator is disposed at the end of the threaded connecting post, and the fastener passes through the resonator and is threadedly connected to the threaded connecting post.

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