CN215644924U

CN215644924U - Filter

Info

Publication number: CN215644924U
Application number: CN202121566061.6U
Authority: CN
Inventors: 柯友文; 朱晖; 钟道琼; 万波; 高贺彪
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: Wuhan Fingu Electronic Technology Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-01-25
Anticipated expiration: 2031-07-12

Abstract

The utility model provides a filter which comprises a cavity, a cover plate, at least one partition plate and resonators, wherein the partition plate is arranged in the cavity and divides the cavity into a plurality of resonant cavities, each resonant cavity is internally provided with one resonator, the cover plate covers the cavity, the partition plate is provided with a U-shaped groove, an elastic tuning assembly is arranged on the cover plate and right faces the resonant cavities, the cover plate is provided with a coupling adjusting hole right facing the U-shaped groove, a coupling adjusting plate is arranged in the coupling adjusting hole, a gap is reserved between the coupling adjusting plate and the inner side wall of the coupling adjusting hole, and the coupling adjusting plate is connected with the bottom of the inner side wall of the coupling adjusting hole. The filter changes the distance between the elastic tuning component and the resonator by pressing the cover plate through external pressure to achieve an electric tuning function, and meanwhile, the coupling mode between the resonant cavities is adjusted by slotting and pressing the coupling adjusting plate through the cover plate to adjust the depth, so that the debugging performance index of the filter is integrally realized, the height of a screw is saved in the overall height, and the design of product miniaturization is facilitated.

Description

Filter

Technical Field

The utility model belongs to the technical field of communication, and particularly relates to a filter.

Background

Cavity filters are widely used in the field of communications as a frequency selective device. A cavity filter structure in the prior art is generally shown in fig. 1, and generally includes a cavity 1 and a cover plate 2, a resonator 3 is disposed in the cavity 1, a tuning coupling screw or screw 4 corresponding to the resonator 3 is mounted on the cover plate 3 through a lock nut 5, and the tuning coupling screw or screw 4 is rotated to change the length of the tuning coupling screw 4 extending into the resonator 3, thereby implementing electrical tuning and filter performance.

However, the tuning mode of the cavity filter with the traditional structure adopts a thread rotation matching mode, and a locking nut is required to be installed, so that the structure is complex, the product weight is heavy, and the cost is high. In addition, the installation of the tuning coupling screw or screw and the lock nut can occupy a part of the overall height of the filter, which is not beneficial to reducing the overall height volume of the product, thereby being not beneficial to the miniaturization design of the filter.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems that the structure of the existing cavity filter is complex, and the performance of the cavity filter is influenced by debris generated by a thread rotation tuning mode.

The utility model provides a filter, which comprises a cavity, a cover plate, at least one partition plate and resonators, wherein the partition plate is arranged in the cavity and divides the cavity into a plurality of resonant cavities, one resonator is arranged in each resonant cavity, the cover plate covers the cavity, the partition plate is provided with a U-shaped groove, the U-shaped grooves penetrate through two adjacent resonant cavities, an elastic tuning assembly is arranged on the cover plate right opposite to the resonant cavities, the cover plate right opposite to the U-shaped grooves is provided with a coupling adjusting hole, a coupling adjusting plate is arranged in the coupling adjusting hole, a gap is reserved between the coupling adjusting plate and the inner side wall of the coupling adjusting hole, and the coupling adjusting plate is connected with the bottom part of the inner side wall of the coupling adjusting hole.

Furthermore, one end or two opposite ends of the coupling adjusting plate are connected with the inner side wall of the corresponding side of the coupling adjusting hole, and a gap is reserved between the rest side of the coupling adjusting plate and the corresponding side of the coupling adjusting hole.

Furthermore, a gap is reserved between the edge of the coupling adjusting plate and the inner side wall of the coupling adjusting hole, and the opposite edges of the coupling adjusting plate are symmetrically provided with extending parts fixedly connected with the corresponding sides of the coupling adjusting hole.

Furthermore, the coupling adjusting plate and the cover plate are integrated or separated, and the thickness of the coupling adjusting plate is smaller than that of the cover plate.

Furthermore, the elastic tuning assembly comprises a tuning column and an elastic plate attached to the outer side of the tuning column, the tuning column is fixed with the elastic plate and extends into the resonant cavity from the elastic plate, the thickness of the tuning column is greater than that of the elastic plate, and the elastic plate supports the tuning column to be far away from or close to the resonator.

Further, the elastic plate is provided with an annular convex rib or/and a concave rib.

Furthermore, the elastic plate and the tuning column are integrally stretched, the tuning column is hollow, and the tuning column extends into the resonant cavity and is matched with the resonator for tuning.

Furthermore, an internal thread is arranged inside the tuning post.

Furthermore, the cover plate is provided with a mounting hole facing the resonant cavity, a positioning step is arranged in the mounting hole and extends from the lower surface of the cover plate to the upper surface, and the elastic plate is fixed on the positioning step.

Furthermore, the cover plate and the elastic plate are integrally formed, and the elastic plate is connected with the bottom of the cover plate.

Compared with the prior art, the utility model has the beneficial effects that:

(1) the filter provided by the utility model achieves the electric tuning function by changing the distance between the elastic tuning component and the resonator through pressing the cover plate by external pressure, and simultaneously adjusts the coupling mode between the resonant cavities through pressing the coupling adjusting plate depth under the slotting of the cover plate, thereby integrally realizing the debugging performance index of the filter, saving the height of a screw rod on the integral height and being beneficial to the design of product miniaturization.

(2) The filter provided by the utility model has a simple structure, the traditional thread rotation matching mode is cancelled in the tuning mode, the problem that the resonator and the cover plate generate scraps in the tuning process is effectively avoided, the intermodulation value and the intermodulation stability of a product are improved, and meanwhile, because the tuning mode does not need a fixing nut any more, the structure is simplified, the weight is far lower than that of the scheme that the existing tuning screw rod is matched with the fixing nut, and the cost is also reduced.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of a conventional thread rotation tuned filter structure;

FIG. 2 is a schematic diagram of a filter with a cover plate and an elastic plate separated from each other according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the inside of a filter with a cover plate and a spring plate separated according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a filter with a cover plate integrated with a spring plate according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of the inner part of a filter with a cover plate integrated with a flexible plate according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a filter with internal threads inside the tuning post according to an embodiment of the present invention;

FIG. 7 is a schematic view of the coupling adjustment plate being connected to opposite ends of the coupling adjustment hole according to an embodiment of the present invention;

FIG. 8 is a schematic view of the coupling adjustment plate connected to an end of the coupling adjustment hole according to an embodiment of the present invention;

FIG. 9 is a schematic view of the coupling adjustment plate partially connected to the edge of the coupling adjustment hole according to an embodiment of the present invention.

Description of reference numerals: 1. a cavity; 2. a cover plate; 3. a resonator; 4. a tuning coupling screw or bolt; 5. locking the nut; 6. a resonant cavity; 7. an elastic tuning component; 8. a partition plate; 9. a coupling adjustment aperture; 10. a coupling adjusting plate; 11. a U-shaped groove; 12. positioning a step; 13. mounting holes; 14. an elastic plate; 15. a tuning post; 16. an internal thread; 17. a gap; 18. an extension portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 2 to 5, the present embodiment provides a filter, which includes a cavity 1, a cover plate 2, at least one partition plate 8, and a resonator 3, wherein the cavity 1 includes a bottom wall and a side wall surrounding the bottom wall, an upper portion of the cavity 1 is open, and the cover plate 2 covers an open side of the cavity 1, the cavity 1 in the present embodiment is square, the cavity 1 in other embodiments may also be round or in other shapes, the present invention is not limited thereto, and the cavity 1 may be a cavity formed by a metal housing, or a cavity formed by electroplating plastic. The partition plates 8 are arranged in the cavity 1, the cavity 1 is divided into a plurality of resonant cavities 6, one resonator 3 is arranged in each resonant cavity 6, and the resonators 3 and the bottom wall of the cavity 1 can be integrally formed or separately formed and then assembled and fixed. The partition plate 8 is provided with a U-shaped groove 11, the U-shaped groove 11 penetrates through two adjacent resonant cavities 6, an elastic tuning assembly 7 is arranged on the cover plate 2 opposite to the resonant cavities 6, the elastic tuning assembly 7 is deformed to a certain extent by applying external pressure to the elastic tuning assembly 7 of the cover plate 2, and then the distance between the elastic tuning assembly 7 and the resonator 3 is changed to achieve an electrical tuning function; for the coupling mode between the resonant cavities 6, the cover plate 2 is provided with a coupling adjusting hole 9 opposite to the U-shaped groove 11, a coupling adjusting plate 10 is arranged in the coupling adjusting hole 9, a gap 17 is reserved between the coupling adjusting plate 10 and the inner side wall of the coupling adjusting hole 9, the coupling adjusting plate 10 is connected with the bottom part of the inner side wall of the coupling adjusting hole 9, through the structural design of the cover plate 2 and the partition plate 8 of the resonant cavity 6, the slotting and pressing mode of the cover plate 2 is adopted, the coupling between the resonant cavities 6 is realized by the pressing depth of the coupling adjusting plate 10 in the U-shaped groove 11, the filter with the structure does not need a fixing nut any more, thereby achieving the structural simplification, and can avoid the piece problem that syntonizer 3 and apron 2 produced in harmonious process, can improve the intermodulation value of product and the stability of intermodulation, reduced the height of screw rod and nut simultaneously, be favorable to the miniaturized design.

In this embodiment, as shown in fig. 7, two opposite end portions of the coupling adjustment plate 10 are respectively connected to inner sidewalls of corresponding sides of the coupling adjustment holes 9, and a gap 17 is left between the remaining sides of the coupling adjustment plate 10 and the corresponding sides of the coupling adjustment holes 9; of course, as shown in fig. 8, the coupling adjustment plate 10 is connected with the coupling adjustment hole 9, only one end of the coupling adjustment plate 10 is connected with the inner side wall of the corresponding side of the coupling adjustment hole 9, and a gap 17 is left between the other sides of the coupling adjustment plate 10 and the corresponding side of the coupling adjustment hole 9. In other embodiments, the coupling adjustment hole 9 and the coupling adjustment plate 10 may be connected as shown in fig. 9, a gap 17 is left between the edge of the coupling adjustment plate 10 and the inner sidewall of the coupling adjustment hole 9, and the opposite sides of the coupling adjustment plate 10 are symmetrically provided with extending portions 18 fixedly connected with the corresponding sides of the coupling adjustment hole 9. In the above embodiments, the coupling adjustment plate 10 and the coupling adjustment hole 9 may be designed to be rectangular, but not limited to rectangular structures.

Specifically, in the connection structure of the coupling adjustment plate 10, the coupling adjustment plate 10 and the cover plate 2 may be an integral structure, or may be a structure that is assembled and fixed after being separately formed, and the thickness of the coupling adjustment plate 10 is smaller than that of the cover plate.

The structure of the elastic tuning assembly 7 is detailed, as shown in fig. 2-6, and includes a tuning column 15 and an elastic plate 14 attached to the outer side of the tuning column 15, the elastic plate 14 is fixed with the cover plate 2, the tuning column 15 is fixed with the elastic plate 14 and extends from the elastic plate 14 to the resonant cavity 6, the thickness of the tuning column 15 is greater than the thickness of the elastic plate 14, the tuning column 15 extends into the resonant cavity 6 to be matched with the resonator 3 for tuning, and a certain deformation is generated by applying an external pressure to the elastic plate 14, so that the elastic plate 14 supports the tuning column 15 to be far away from or close to the resonator 3, thereby achieving the purpose of tuning. Preferably, the elastic plate 14 has annular convex ribs or/and concave ribs, and the elastic plate 14 can be contracted or expanded by applying an external force to the elastic plate 14, so as to realize the ascending or descending of the tuning post 15; of course, in other embodiments, the elastic plate 14 is not limited to this configuration, and may be designed in other configurations, such as a step shape, as long as the contraction and expansion of the elastic plate 14 are facilitated. The material, thickness and size for the elastic plate 14 are set so that it does not return to the original state after being deformed according to the frequency tuning operation, so that the state after tuning is stable. The elastic tuning component 7 with the structure can change the distance between the elastic tuning component 7 and the resonator 3 through external pressure, thereby achieving the purpose of electric tuning function, having simple structure, the weight of the elastic tuning component is far lower than the scheme of the traditional tuning screw rod and the locknut, and the tuning coupling piece has no thread friction rotating structure in the debugging process, does not generate metal wires or metal chips, and can improve the intermodulation value and the intermodulation stability of products.

As a specific embodiment, the elastic plate 14 is formed by integrally stretching a tuning post 15, the tuning post 15 is hollow inside, and the tuning post 15 extends into the resonant cavity 6 and is tuned in cooperation with the resonator 3; at this time, as shown in fig. 6, an internal thread 16 may be disposed on an inner wall of the tuning post 15, and a conductive pin with a small size is introduced into the tuning post 15 to match with the internal thread 16, so as to press down or pull back the tuning post 15 to achieve tuning, and the elastic plate 14 may deform correspondingly during tuning, and does not return to an original state after deforming, so as to support the tuning post 15 in a state after adjustment.

In some embodiments, the cover plate 2 and the elastic plate 14 may be separately provided, as shown in fig. 2 and 3, a mounting hole 13 is provided on the cover plate 2 facing the resonant cavity 6, the mounting hole 13 penetrates through the upper surface and the lower surface of the cover plate 2, a positioning step 12 is provided in the mounting hole 13, the positioning step 12 is provided around the mounting hole 13, and the positioning step 12 extends from the lower surface of the cover plate 2 to the upper surface, that is, the positioning step 12 is located on the bottom surface of the cover plate 2, the area of the elastic plate 14 is slightly larger than the area of the mounting hole 13, and the periphery of the elastic plate 14 is located on the positioning step 12 and fixed to the positioning step 12, so that the mounting hole 13 can be sealed by the elastic tuning assembly 7, and the sealing performance of the resonant cavity 6 is ensured.

In other embodiments, the cover plate 2 and the elastic plate 14 may also be integrally formed, as shown in fig. 4 and 5, in this case, the cover plate 2 does not need to be provided with the mounting hole 13, specifically, the elastic plate 14 is integrally formed with the cover plate 2, the elastic plate 14 is connected with the bottom of the cover plate 2, and the thickness of the elastic plate 14 is smaller than that of the cover plate 2.

In summary, the filter provided by the utility model achieves the electric tuning function by changing the distance between the elastic tuning component and the resonator by pressing the cover plate through external pressure, and meanwhile, the debugging performance index of the filter is integrally realized by adjusting the coupling between the resonant cavities by pressing the depth of the coupling adjusting plate through the slotting of the cover plate, and the height of the screw is saved on the overall height, thereby being beneficial to the design of product miniaturization.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the utility model, which is intended to be covered by the claims and any design similar or equivalent to the scope of the utility model.

Claims

1. The utility model provides a filter, includes cavity, apron, at least one baffle and resonator, the baffle sets up in the cavity, cuts apart into a plurality of resonant cavities with the cavity, every set up a resonator in the resonant cavity, the apron cover in on the cavity, its characterized in that: the improved U-shaped resonant cavity is characterized in that a U-shaped groove is formed in the partition plate, the U-shaped groove penetrates through two adjacent resonant cavities, an elastic tuning assembly is installed on the cover plate and is right opposite to the resonant cavities, a coupling adjusting hole is formed in the cover plate and is right opposite to the U-shaped groove, a coupling adjusting plate is installed in the coupling adjusting hole, a gap is reserved between the coupling adjusting plate and the inner side wall of the coupling adjusting hole, and the coupling adjusting plate is partially connected with the bottom of the inner side wall of the coupling adjusting hole.

2. A filter as claimed in claim 1, wherein: one end or two opposite ends of the coupling adjusting plate are connected with the inner side wall of the corresponding side of the coupling adjusting hole, and a gap is reserved between the rest side of the coupling adjusting plate and the corresponding side of the coupling adjusting hole.

3. A filter as claimed in claim 1, wherein: a gap is reserved between the edge of the coupling adjusting plate and the inner side wall of the coupling adjusting hole, and extending portions which are fixedly connected with the corresponding side edges of the coupling adjusting hole are symmetrically arranged on the opposite sides of the coupling adjusting plate.

4. A filter as claimed in any one of claims 1 to 3, wherein: the coupling adjusting plate and the cover plate are integrated or separated, and the thickness of the coupling adjusting plate is smaller than that of the cover plate.

5. A filter as claimed in claim 1, wherein: the elastic tuning assembly comprises a tuning column and an elastic plate attached to the outer side of the tuning column, the tuning column is fixed with the elastic plate and extends into the resonant cavity from the elastic plate, the thickness of the tuning column is larger than that of the elastic plate, and the elastic plate supports the tuning column to be far away from or close to the resonator.

6. A filter as claimed in claim 5, characterised in that: the elastic plate is provided with an annular convex rib or/and a concave rib.

7. A filter as claimed in claim 5, characterised in that: the elastic plate and the tuning column are integrally stretched to form the tuning column, the interior of the tuning column is hollow, and the tuning column extends into the resonant cavity and is matched with the resonator for tuning.

8. A filter as claimed in claim 7, wherein: internal threads are arranged inside the tuning post.

9. A filter as claimed in any one of claims 5 to 8, characterised in that: the cover plate is provided with a mounting hole opposite to the resonant cavity, a positioning step is arranged in the mounting hole and extends from the lower surface of the cover plate to the upper surface, and the elastic plate is fixed on the positioning step.

10. A filter as claimed in any one of claims 5 to 8, characterised in that: the cover plate and the elastic plate are integrally formed, and the elastic plate is connected with the bottom of the cover plate.