CN222214436U - Cavity filter - Google Patents
Cavity filter Download PDFInfo
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- CN222214436U CN222214436U CN202421015920.6U CN202421015920U CN222214436U CN 222214436 U CN222214436 U CN 222214436U CN 202421015920 U CN202421015920 U CN 202421015920U CN 222214436 U CN222214436 U CN 222214436U
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- cavity
- filter
- tuning screw
- cover plate
- hole
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- 238000002955 isolation Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 abstract description 2
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- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The specification relates to the field of communication technology, and relates to a cavity filter. The cavity filter comprises a filter cavity, a cover plate, a tuning screw and a resonator, wherein the cover plate is arranged on the surface of the filter cavity, the resonator is arranged in the filter cavity, a concave part is arranged on the surface of the cover plate, the concave part is concave towards the inside of the filter cavity, a through hole is formed in the bottom surface of the concave part, a screw rod of the tuning screw penetrates through the through hole to align with the resonator, the size of the end part of the tuning screw is smaller than that of the bottom surface of the concave part and larger than that of the through hole, and when the screw rod of the tuning screw penetrates through the through hole, the end part of the tuning screw is clamped on the bottom surface of the concave part. The cavity filter of the embodiment of the specification is small in size and low in cost while guaranteeing a communication function, and is convenient to use and disassemble.
Description
Technical Field
Embodiments of the present disclosure relate to the field of communications technologies, and in particular, to a cavity filter.
Background
The cavity filter is a filter with excellent performance, is suitable for various occasions with high frequency and high power, mainly comprises a resonant cavity, a cover plate, a tuning screw and other parts, when the input signal frequency of the cavity filter is close to the resonance frequency of the cavity, signals of the frequency can pass through the cavity without damage based on the resonance phenomenon of the cavity, and signals of other frequencies can be attenuated to achieve the filtering effect. The filtering effect is mainly dependent on the resonant frequency and bandwidth of the cavity, and these parameters can be achieved by adjusting the geometry of the cavity and the characteristics of the material. At present, the weight and the volume of the cavity filter are large, the tuning screws installed on the cover plate above the cavity filter occupy extra space when protruding, the prior art generally fully penetrates the tuning screws into the cover plate to reduce the volume occupation, the compact requirement on the contact surface of the tuning screws and the cover plate is high, and the disassembly and the adjustment are not facilitated.
Disclosure of utility model
Embodiments of the present specification provide a cavity filter that aims to address one or more of the above problems, as well as other potential problems.
In order to achieve the above object, the following technical scheme is provided:
The specification provides a cavity filter, which comprises a filter cavity, a cover plate, a tuning screw and a resonator, wherein the cover plate is arranged on the surface of the filter cavity, the resonator is arranged in the filter cavity, a concave part is arranged on the surface of the cover plate, the concave part is concave towards the inside of the filter cavity, a through hole is formed in the bottom surface of the concave part, a screw rod of the tuning screw penetrates through the through hole to align with the tuner, the size of the end part of the tuning screw is smaller than that of the bottom surface of the concave part, and the end part of the tuning screw is clamped on the bottom surface of the concave part when the screw rod of the tuning screw penetrates through the through hole.
According to the cavity filter in the embodiment of the specification, the tuning screw penetrates through the concave part which is concave towards the direction of the cavity of the filter to enter the cavity of the filter, on one hand, the exposed volume of the tuning screw is hidden, the external size of the cavity filter is reduced, the space utilization rate and the tuning range are increased, meanwhile, the tuning screw is prevented from being interfered by the outside, on the other hand, the inner surface of the cover plate is protruded, the larger the bottom surface diameter of the concave part is, the higher the side surface depth is, the smaller the internal volume of the cavity filter is, in order to ensure the original resonant frequency, the size of the resonator is required to be reduced, and the cost is reduced due to the fact that the resonator is expensive, and the size is reduced.
In some embodiments, the recess side height is greater than the height of the tuning screw exposed at the cover plate outer surface.
In some embodiments, the recess floor center is opposite the resonator center, and the recess floor diameter is equal or similar to the resonator diameter.
In some embodiments, the through hole is a threaded through hole through which the tuning screw is threaded into the filter cavity.
In some embodiments, the tuning screw is a self-locking screw.
In some embodiments, the tuning screw is provided with an elastic sleeve on the end side, which fills the void of the recess when the tuning screw end enters the recess.
In some embodiments, the plurality of concave portions are provided, the plurality of tuning screws and the plurality of resonators are provided, the plurality of tuning screws respectively penetrate through the concave portions and are in one-to-one correspondence with the resonators, and the plurality of resonators are respectively arranged in different resonant cavities of the filter cavity.
In some embodiments, different resonant cavities of the filter cavity are separated by an isolation rib, and two ends of the isolation rib are respectively clamped into grooves on the bottom surface of the filter cavity and the inner surface of the cover plate.
In some embodiments, positioning posts are disposed on opposite angles of the inner surface of the cover plate, and positioning holes matched with the positioning posts are disposed on the filter cavity.
In some embodiments, the recess and the cover plate are a unitary structure.
Drawings
The above, as well as additional purposes, features, and advantages of embodiments of the present specification will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the accompanying drawings, several embodiments of the present description are shown by way of example, and not by way of limitation.
Fig. 1 shows a side cross-sectional view of a cavity filter according to an embodiment of the present disclosure;
FIG. 2 shows a side cross-sectional view of the cover plate of FIG. 1;
FIG. 3 shows an interior view of the cover plate of FIG. 1;
Fig. 4 shows an external schematic view of a cavity filter according to an embodiment of the present disclosure;
FIG. 5 shows a plot of recess floor diameter versus cavity filter resonant frequency;
fig. 6 shows a plot of recess side depth versus cavity filter resonant frequency.
The filter comprises a 1-filter cavity, 11-isolation ribs, 12-positioning holes, 2-cover plates, 21-concave parts, 211-through holes, 22-positioning columns, 3-tuning screws and 4-resonators.
Like or corresponding reference characters indicate like or corresponding parts throughout the several views.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present description are shown in the drawings, it should be understood that the present description may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "upper," "lower," "front," "rear," and the like, as used herein, refer to a position or a positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the principles of the present specification, and do not indicate or imply that the elements referred to must have a particular orientation, be configured or operated in a particular orientation, and thus should not be construed as limiting the present specification.
A cavity filter according to an embodiment of the present specification is described in detail below with reference to the accompanying drawings. Fig. 1 shows a side cross-sectional view of a cavity filter according to an embodiment of the present description. The cavity filter of the embodiment of the specification comprises a filter cavity 1, a cover plate 2, a tuning screw 3 and a resonator 4, wherein the cover plate 2 is arranged on the surface of the filter cavity 1, the resonator 4 is arranged in the filter cavity 1, a concave part 21 is arranged on the surface of the cover plate 2, the concave part 21 is concave towards the inside of the filter cavity 1, a through hole 211 is formed in the bottom surface of the concave part 21, a screw rod of the tuning screw 3 penetrates through the through hole 211 to align with the resonator 4, the size of the end part of the tuning screw 3 is smaller than that of the bottom surface of the concave part 21, and the end part of the tuning screw 3 is clamped on the bottom surface of the concave part 21 when the screw rod of the tuning screw 3 penetrates through the through hole 211.
The tuning screw 3 is mainly used for accurately adjusting the working frequency and performance of the cavity filter, and the resonance frequency and bandwidth of the cavity filter can be effectively changed by adjusting the position and depth of the tuning screw 3 penetrating through the cover plate 2, so that the filtering effect on the specific frequency signal is achieved. When the tuning screw 3 passes through the cover plate 2, the position and depth of the tuning screw 3 are usually fixed by nuts and the like, so that the fixing structures such as the nuts protruding out of the surface of the cover plate 2 occupy the space above the cover plate of the cavity filter, the whole volume of the filter is increased, the space is wasted, and the adjusting range of the resonant frequency of the cavity filter is reduced in the same accommodating space. The tuning screw 3 in the embodiment of the present disclosure passes through the recess 21, the recess 21 is recessed toward the inside of the filter cavity 1, so as to provide an accommodating space for the exposed portion of the tuning screw 3, and the end portion of the tuning screw 3 is a nut or other exposed fixing portion. As shown in fig. 1, the left side of fig. 1 shows a state in which the tuning screw 3 is aligned with the resonator 4 through the recess 21, and the right side of fig. 1 shows a state in which the tuning screw 3 has not yet penetrated into the recess 21.
In addition, as shown in fig. 2 and 3, the height of the side surface of the recess 21 is greater than the height of the tuning screw 3 exposed on the outer surface of the cover plate 2, and the size of the bottom surface of the recess 21 is greater than the size of the end of the tuning screw 3, so that the end of the tuning screw 3 is completely accommodated, and a certain gap is left between the side surface of the recess 21 and the end of the tuning screw 3, thereby facilitating the replacement of the tuning screw 3.
In this embodiment, the recess 21 is recessed into the filter cavity 1, the inner surface of the cover plate 2 is protruded, and under the condition that other conditions are not changed, as shown in fig. 5 and 6, the larger the bottom surface diameter of the recess 21 is, the higher the side depth is, the smaller the inner volume of the filter cavity 1 is, the smaller the resonant frequency of the cavity filter is, in order to ensure the original resonant frequency, the height of the resonator 4 needs to be reduced, the size of the resonator 4 is changed, the resonator 4 is expensive, and the cost reduction is indirectly realized by reducing the size of the resonator 4 on the premise of ensuring the original resonant frequency.
The cover plate 2 is mainly made of metal materials, such as common materials including aluminum materials, copper-aluminum alloys and the like, and the surface of the cover plate can be electroplated with a silver layer for improving the radio frequency characteristics of the cavity filter and improving the corrosion resistance, oxidation resistance and the like of the cover plate 2 body. The recess 21 and the cover plate 2 are of an integrated structure, and are formed by manufacturing processes such as integral stamping, cold heading, stretching or die casting, so that the overall structural stability of the cavity filter is improved. The recess 21 may also be an independent component, and is connected to the opening reserved on the cover plate 2 through welding, riveting, splicing and other processes, so as to facilitate the subsequent disassembly, replacement and maintenance. The through hole 211 is a threaded through hole, and the tuning screw 3 is screwed into the filter cavity 1 through the threaded through hole. The threaded through hole may be formed in other members, and may be formed through the bottom surface of the recess 21 by riveting, crimping, or the like.
In order to facilitate the alignment of the tuning screw 3 passing through the recess 21 with the resonator 4, the center of the bottom surface of the recess 21 is opposite to the center of the resonator 4, and the diameter of the bottom surface of the recess 21 is equal to or similar to the diameter of the resonator 4, and the diameter of the bottom surface of the recess 21 is in the range of 80% -120% of the diameter of the resonator 4.
In one embodiment, the tuning screw 3 is a self-locking screw. The self-locking screw can be automatically locked after penetrating or installing, a more stable fixing effect is provided, the screw is prevented from loosening under the action of vibration or external force, the reliability and the safety of connection are improved, meanwhile, the manual screwing process is reduced, the efficiency is improved, the labor cost is reduced, and the quality and the consistency of the cavity filter are ensured.
In another embodiment, an elastic sleeve is arranged on the side surface of the end part of the tuning screw 3, and fills the gap of the concave part 21 when the end part of the tuning screw 3 enters the concave part 21, so that the fixing stability of the tuning screw 3 and the tightness of the contact between the tuning screw 3 and the cover plate 2 are ensured.
In addition, as shown in fig. 4, there are a plurality of concave portions 21, a plurality of tuning screws 3 and a plurality of resonators 4, a plurality of tuning screws 3 respectively pass through the concave portions 21 and correspond to the resonators 4 one by one, the resonance frequencies of the cavity filters are respectively adjusted, and a plurality of resonators 4 are respectively arranged in different resonance cavities of the filter cavity 1. The number of the resonant cavities is generally 6-13, and is not limited to the one shown in fig. 4. Different resonant cavities of the filter cavity 1 are separated by the isolation ribs 11, two ends of the isolation ribs 11 are respectively clamped into grooves on the bottom surface of the filter cavity 1 and the inner surface of the cover plate 2, disassembly and assembly of the isolation ribs 11 are facilitated according to specific requirements, and the number of the resonant cavities is changed.
In order to increase the accuracy of the assembly process of the cover plate 2 and other components and prevent dislocation, positioning columns 22 are arranged on opposite angles of the inner surface of the cover plate 2, positioning holes 12 matched with the positioning columns 22 are arranged on the filter cavity 1, the positioning columns 22 are aligned to the positioning holes 12 to be inserted in assembly, and the relative positions of the cover plate 2 and other components of the cavity filter are limited.
While several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present description. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.
The embodiments of the present specification have been described above, and the above description is illustrative, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421015920.6U CN222214436U (en) | 2024-05-11 | 2024-05-11 | Cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421015920.6U CN222214436U (en) | 2024-05-11 | 2024-05-11 | Cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222214436U true CN222214436U (en) | 2024-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421015920.6U Active CN222214436U (en) | 2024-05-11 | 2024-05-11 | Cavity filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222214436U (en) |
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- 2024-05-11 CN CN202421015920.6U patent/CN222214436U/en active Active
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