Resonator and cavity filter

Abstract

The resonator is provided with a resonance rod, a deformation part and a tuning driving piece, the resonance rod can be fixed in a cavity of the filter, the deformation part is fixed on the resonance rod, the thickness of the deformation part is thin, so that the deformation part is easy to deform under the driving of external stress, one end of the tuning driving piece is connected with the resonance rod, and the other end of the tuning driving piece is connected with the cavity of the filter. One end of the resonator is connected with the cover plate, and the other end of the resonator is connected with the deformation part and can drive the deformation part to deform in the process of moving towards the deformation part, and the distance between the resonator and the cover plate can be changed through deformation of the deformation part, so that frequency modulation of the filter is realized, and a tuning screw for frequency modulation does not need to be independently arranged at the cover plate; the thickness of the cover plate can be reduced as much as possible, and the mass and size of the filter are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field, concretely relates to a resonator and cavity filter. BACKGROUND

[0002] Cavity filter is widely used in communication field as a kind of frequency selection device, especially radio frequency communication field.In base station, filter is used to select communication signal, and filter out noise or interference signal outside communication signal frequency.Filter needs to be debugged before being put into use.

[0003] The patent document with the announcement number CN203119067U discloses a cavity filter, which comprises a cavity, a cover plate, a tuning screw rod and a resonant rod, the resonant rod is fixed in the cavity, the cover plate is fixedly installed at the opening of the cavity, and the cover plate is provided with a threaded hole, the tuning screw rod is threadedly connected with the threaded hole and one end of the tuning screw rod extends into the cavity, wherein, the resonant rod is provided with a through hole in the middle, the tuning screw rod extends into the through hole, and the cavity filter controls the length of the tuning screw rod extending into the resonant rod by screwing the tuning screw rod, thereby realizing frequency tuning of the filter.

[0004] Although the existing filter can conveniently tune frequency by the setting of tuning screw rod, in order to ensure the stable connection of the cover plate and the tuning screw rod, the thickness of the cover plate needs to be increased, or the connecting part of the tuning screw rod needs to be thickened, and the upper end of the tuning screw rod will extend out of the filter, thereby resulting in that the mass and volume of the filter are large. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above technical deficiencies, and provides a resonator and cavity filter, to solve the technical problem of large mass and volume of the cavity filter in the prior art.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0007] In the first aspect, the utility model provides a resonator, which comprises:

[0008] A resonant rod;

[0009] A deformation part fixed to the resonant rod; and

[0010] A tuning driving part connected to one end of the resonant rod and connected to the deformation part at the other end, the tuning driving part can move relative to the resonant rod, and can drive the deformation part to deform by moving relative to the resonant rod.

[0011] In some embodiments, one end of the tuning driving part close to the deformation part abuts against the deformation part.

[0012] In some embodiments, the tuning driving part is threadedly connected with the resonant rod.

[0013] In some embodiments, the inner side of the resonant rod is provided with an axially-through threaded connecting hole, the deformation part is located in the extension direction of the threaded connecting hole, and the tuning driving part is threadedly connected to the threaded connecting hole.

[0014] In some embodiments, the end of the resonant rod is provided with an annular connecting seat, and the deformation part is fixed to the annular connecting seat.

[0015] In some embodiments, the annular connecting seat is provided with an annular mounting groove, and the deformation part is mounted in the annular mounting groove.

[0016] In some embodiments, the end of the resonant rod is provided with an annular connecting seat, and the deformation part is fixed to the annular connecting seat.

[0017] In some embodiments, the bottom wall of the cavity is provided with a plug-in table, and the resonant rod is plug-in mounted in the plug-in table.

[0018] In some embodiments, the cavity is provided with an operation port, and the operation port is opposite to the tuning driving part.

[0019] In some embodiments, the operation port extends to the threaded connecting hole and forms a debris channel in conjunction with the threaded connecting hole.

[0020] Compared with the prior art, the resonator provided by the utility model includes a resonant rod, a deformation part and a tuning driving part, the resonant rod can be fixed to the cavity of the filter, the deformation part is fixed to the resonant rod and is easy to deform under external force driving, one end of the tuning driving part is connected with the resonant rod, and the other end is connected with the deformation part, and in the process of moving towards the deformation part, the deformation part is deformed, the distance between the resonator and the cover plate is changed through the deformation of the deformation part, so that the frequency of the filter is adjusted, and therefore, it is not necessary to separately provide a tuning screw for frequency adjustment at the cover plate, so that the thickness of the cover plate can be reduced as much as possible, and the mass and volume of the filter are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the resonator provided by the utility model embodiment;

[0022] Figure 2 is a front view of the resonator provided by the utility model embodiment;

[0023] Figure 3 is a sectional view along the line A-A in figure 1; Figure 2

[0024] Figure 4 is a structural schematic view of the cavity filter provided by the utility model embodiment;​

[0025] Figure 5 is a front view of the cavity filter provided by the embodiment of the present application;

[0026] Figure 6 is a cross-sectional view along Figure 5 the A-A line in the middle.

[0027] Reference signs in the drawings:

[0028] 10 - resonant rod 11 - annular connecting seat 12 - threaded connecting hole

[0029] 20 - deformation part 30 - tuning driving member 40 - cavity

[0030] 41 - plug-in table 42 - operation port 43 - debris channel

[0031] 50 - cover plate 111 - annular mounting groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0033] In order to solve the technical problem of large mass and volume of the cavity filter in the prior art, the present application provides a resonator, which can realize frequency tuning by deformation of the resonator itself, so that a tuning screw does not need to be separately provided on the filter, thereby reducing the mass and volume of the filter.

[0034] It should be noted that the resonator described in the present application is used for but not limited to cavity filters and the like. In order to facilitate the description, in the present application, only the resonator applied to the cavity filter is taken as an example for description, and the principle of the resonator applied to other types of devices is substantially the same as that applied to the cavity filter, which will not be described here.

[0035] The resonator provided by the present application, as shown in Figures 1-3 and 6, comprises a resonant rod 10, a deformation part 20 and a tuning driving member 30, the deformation part 20 is fixed to the resonant rod 10; one end of the tuning driving member 30 is connected with the resonant rod 10, the other end of the tuning driving member 30 is connected with the deformation part 20, the tuning driving member 20 can move relative to the resonant rod 10, and the deformation part 20 can be deformed by the movement of the tuning driving member 20 relative to the resonant rod.

[0036] Specifically, the resonator is provided with a resonant rod 10, a deformation part 20 and a tuning driving part 30, the resonant rod 10 is fixed to a cavity 40 of the filter, the deformation part 20 is fixed to the resonant rod 10 and is easy to deform under external force driving, the tuning driving part 30 is connected to one end of the resonant rod 10 and is connected to the other end of the deformation part 20, and in the process of moving towards the deformation part 20, the deformation part 20 is deformed, the distance between the resonator and the cover plate 50 is changed through the deformation of the deformation part 20, so that the frequency of the filter is adjusted, and thus it is not necessary to separately provide a tuning screw for frequency adjustment at the cover plate 50, so that the thickness of the cover plate 50 can be reduced as much as possible, and the mass and volume of the filter are reduced.

[0037] It can be understood that the deformation part 20 can be made of a material that is easy to deform or a thin plate, so that it is easy to deform under the driving of the tuning driving part 30. When the deformation part 20 is a thin plate, the thickness of the deformation part 20 can be adaptively set according to actual needs, as long as it can deform under the driving of the tuning driving part 30.

[0038] In this embodiment, the deformation part 20 is a thin plate fixed to the resonant rod 10.

[0039] It can be understood that the deformation part 20 can be sleeved on the resonant rod 10 or fixed to the side of the resonant rod 10, and the like, so as to be fixedly connected to the resonant rod 10.

[0040] In one of the embodiments, as shown in Figures 1-3 and 6, the end of the resonant rod 10 has a ring-shaped connecting seat 11, and the deformation part 20 is fixed to the ring-shaped connecting seat 11. Specifically, the deformation part 20 is fixed to the ring-shaped connecting seat 11 at the end of the resonant rod 10, so that a space is formed between the deformation part 20 and the end of the resonant rod 10, and the deformation part 20 is more easily deformed.

[0041] In one of the embodiments, as shown in Figure 3 and 6 , the ring-shaped connecting seat 11 is provided with a ring-shaped mounting groove 111, and the deformation part 20 is arranged in the ring-shaped mounting groove 111. Specifically, the deformation part 20 is arranged in the ring-shaped mounting groove 111, so that the surface of the deformation part 20 is flush with the surface of the ring-shaped connecting seat 11, and the deformation part 20 is integrated with the resonant rod 10.

[0042] It can be understood that the tuning driving member 30 can be sleeved on the resonant rod 10 or arranged inside the resonant rod 10, the tuning driving member 30 can be connected with the resonant rod 10 through large friction, when the artificial control tuning driving member 30 drives the deformation part 20 to deform through sliding, the tuning driving member 30 supports the deformed deformation part 20 through the friction with the resonant rod 10; the tuning driving member 30 can also be connected with the resonant rod 10 through the ratchet structure, the tuning driving member 30 drives the deformation part 20 to deform, and then supports the deformed deformation part 20 through the one-way force of the ratchet.

[0043] In one embodiment, the tuning driving member 30 is threadedly connected with the resonant rod 10. Specifically, through the threaded connection of the tuning driving member 30 and the resonant rod 10, the tuning driving member 30 can be moved towards the deformation part 20 by screwing the tuning driving member 30, so as to drive the deformation part 20 to deform.

[0044] It can be understood that the tuning driving member 30 can be threadedly connected to the surface of the resonant rod 10 or the inside of the resonant rod 10.

[0045] In one embodiment, as shown in Figure 3 and 6 , the inside of the resonant rod 10 is provided with an axially penetrating threaded connection hole 12, the deformation part 20 is located in the extension direction of the threaded connection hole 12, and the tuning driving member 30 is threadedly connected to the threaded connection hole 12. Specifically, the threaded connection hole 12 can be used for threadedly connecting the tuning driving member 30, so that the tuning driving member 30 is threadedly connected to the inside of the resonant rod 10. Since the tuning driving member 30 will form friction with the resonant rod 10 during screwing, metal chips will be generated, which will be formed on the inside of the resonant rod 10 and will not fall into the cavity 40 of the filter to affect the frequency tuning of the filter. The threaded connection hole 12 penetrates the resonant rod 10 axially, so that the end of the tuning driving member 30 can extend out of the threaded connection hole 12 and be connected with the deformation part 20, and a control tool can be inserted into the inside of the resonant rod 10 to control the tuning driving member 30, and meanwhile, the metal chips generated during the screwing of the tuning driving member 30 can be discharged.

[0046] It can be understood that the tuning driving member 30 can be connected with the deformation part 20 in a fixed connection, a rotary connection or the like.

[0047] In one embodiment, as shown in Figure 3 and 6 , one end of the tuning driving member 30 close to the deformation part 20 abuts against the deformation part 20. Specifically, the tuning driving member 30 abuts against the deformation part 20, so that during the axial movement of the tuning driving member 30, the tuning driving member 30 will press the deformation part 20 and drive the deformation part 20 to deform.

[0048] In this embodiment, as shown in Figure 3 and 6 The tuning driving member 30 is connected to the center of the deformation part 20 to ensure that the deformation part 20 deforms uniformly.

[0049] In this embodiment, as shown in Figure 3 and 6 The tuning driving member 30 is a screw threadedly connected to the threaded connection hole 12, and the screw abuts against the deformation part 20.

[0050] The utility model also provides a cavity filter, as shown in Figure 6 It comprises a cavity 40, a cover plate 50 and the resonator, the resonator is fixed to the inner side of the cavity 40, and the cover plate 50 is covered on the cavity 40. Specifically, the cavity filter is provided with the above-mentioned resonator, so that when the filter is working in frequency modulation, only the deformation of the deformation part 20 is needed by controlling the tuning driving member 30, the frequency modulation of the filter can be realized, the thickness of the cover plate 50 can be reduced as much as possible, and a tuning screw rod does not need to be separately arranged on the cover plate 50, thereby reducing the volume and mass of the cavity filter.

[0051] In one embodiment, as shown in Figure 6 The bottom wall of the cavity 40 is provided with a plug-in table 41, and the resonant rod 10 is inserted into the plug-in table 41. Specifically, the resonant rod 10 is provided by being inserted into the plug-in table 41, so that the fixation of the resonant rod 10 on the bottom wall of the cavity 40 can be realized, and when the cavity filter is assembled, only the resonant rod 10 needs to be inserted into the plug-in table 41, and then the upper cover is assembled, thereby providing convenience for the assembly of the filter.

[0052] In one embodiment, as shown in Figure 6 The cavity 40 is provided with an operation port 42, and the operation port 42 is opposite to the tuning driving member 30. Specifically, the operation port 42 can conveniently enable the tool to enter and connect the resonant driving member, thereby providing convenience for the frequency modulation of the filter.

[0053] In one embodiment, as shown in Figure 6 The operation port 42 extends to the threaded connection hole 12 and is connected to the threaded connection hole 12 to form a debris passage 43. Specifically, the threaded connection hole 12 and the operation port 42 are connected to form the debris passage 43, so that the debris formed in the process of rotating the tuning driving member 30 can fall out of the cavity through the debris passage 43.

[0054] In this embodiment, as shown in Figure 6 The operation port 42 extends axially along the inner side of the plug-in table 41 and finally connects to the threaded connection hole 12.

[0055] The specific implementation of the utility model above does not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A resonator, characterized by, The resonant rod; The deformation part is fixed to the resonant rod; And The tuning drive member is connected to one end of the resonant rod and the other end of the deformation part, the tuning drive member can move relative to the resonant rod, and can drive the deformation part to deform by moving relative to the resonant rod. The end of the tuning drive member close to the deformation part abuts against the deformation part.

2. The resonator of claim 1, wherein The tuning drive member is threadedly connected to the resonant rod.

3. The resonator of claim 1, wherein The resonant rod is provided with an axial through threaded connection hole on the inside, the deformation part is located in the extension direction of the threaded connection hole, and the tuning drive member is threadedly connected to the threaded connection hole.

4. The resonator of claim 1, wherein The end of the resonant rod has an annular connecting seat, and the deformation part is fixed to the annular connecting seat.

5. The resonator according to any of claims 1-4, characterized in that The annular connecting seat is provided with an annular mounting groove, and the deformation part is mounted in the annular mounting groove.

6. The resonator of claim 5, wherein, The resonator of any one of claims 1-6 is fixed to the inside of the cavity, and the cover plate covers the cavity.

7. A cavity filter, characterized by, The bottom wall of the cavity is provided with a plug-in table, and the resonant rod is plug-in mounted in the plug-in table.

8. The cavity filter of claim 7, wherein, The cavity is provided with an operation port, and the operation port is opposite to the tuning drive member.

9. The cavity filter of claim 7, wherein, The operation port extends to the threaded connection hole inside the resonant rod and forms a debris passage with the threaded connection hole.

10. The cavity filter of claim 9, wherein, ​

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