Cavity filter and communication equipment

Abstract

The invention discloses a cavity filter and communication equipment, and relates to the technical field of communication. The cavity filter comprises a cavity and a resonator group arranged in the cavity, the resonator group comprises a plurality of resonators connected in sequence, each resonator comprises a receiving part, a first connecting part and a second connecting part, and the receiving part is used for receiving a tuning screw; the first connecting part of the resonator at the head end is used for connecting the cavity; the second connecting part of the resonator located at the tail end is used for being connected with the cavity, and the first connecting part of the latter resonator is connected with the second connecting part of the former resonator, so that a plurality of resonators can be connected with the cavity without a mounting structure; thus, the problems that miniaturization of the cavity filter is hindered due to the fact that each resonator is additionally provided with an installation structure, and meanwhile the material cost and the installation time are increased due to the fact that a plurality of installation structures are additionally arranged are solved.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a cavity filter and communication equipment. Background Art

[0002] At present, most of the base station cavity filters on the market are metal cavity filters, dielectric cavity filters and dielectric waveguide filters. However, according to the different development concepts of each company, the design direction of their products is also different. Compared with the currently booming 5G base stations, there are two solutions for base station filters used, namely miniaturized metal filters and ceramic dielectric filters. The former is a transition solution from 4G to 5G, and the latter may be the mainstream solution for future base station filters. At present, except for Huawei's more aggressive application of ceramic dielectric filters, most other major equipment manufacturers, such as ZTE, Ericsson, Nokia, etc., choose to take into account both routes and adopt miniaturized metal cavity filters in the early stage of 5G commercialization.

[0003] The existing miniaturized metal cavity filter has multiple resonators in the cavity, and in order to install multiple resonators, the cavity needs to be additionally provided with a mounting structure for each resonator. The additional multiple mounting structures will undoubtedly occupy space in the cavity, which hinders the miniaturization of the cavity filter. At the same time, the additional multiple mounting structures will also increase material costs and installation time. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a cavity filter and a communication device for solving the problem caused by providing an additional mounting structure for each resonator.

[0005] According to a first aspect of the present invention, a cavity filter is provided, comprising a cavity and a resonator group arranged in the cavity, wherein the resonator group comprises a plurality of resonators connected in sequence, and the plurality of resonators respectively comprise:

[0006] A receiving portion, the receiving portion being used to receive a tuning screw;

[0007] A first connecting portion, the first connecting portion of the resonator located at the head end is used to connect to the cavity;

[0008] The second connection portion, the second connection portion of the resonator located at the tail end is used to connect to the cavity, wherein the first connection portion of the latter resonator is connected to the second connection portion of the former resonator.

[0009] The cavity filter of the present invention is connected to the cavity through the first connecting part of the resonator located at the head end, and the second connecting part of the resonator located at the tail end is connected to the cavity, and the first connecting part of the rear resonator is connected to the second connecting part of the front resonator, so that multiple resonators can be connected to the cavity without a mounting structure, thereby solving the problem that the miniaturization of the cavity filter is hindered by setting an additional mounting structure for each resonator, and the problem that the additional multiple mounting structures will also increase material costs and installation time.

[0010] In some embodiments, the first connection portion of the latter resonator is connected to the second connection portion of the former resonator via a third connection portion, and the third connection portion is perpendicular to the first connection portion.

[0011] In some embodiments, the first connection portion is parallel to the second connection portion, and the first connection portion is parallel to an axis of the tuning screw.

[0012] In some embodiments, the receiving portion includes:

[0013] annular part;

[0014] a first bending portion, wherein the first bending portion is connected to the annular portion and the first connecting portion respectively;

[0015] The second bending portion is connected to the annular portion and the second connecting portion respectively, and the second bending portion and the first bending portion are symmetrical with respect to the axis of the annular portion.

[0016] In some embodiments, the annular portion comprises:

[0017] A circular ring portion, wherein the axis of the circular ring portion coincides with the axis of the tuning screw;

[0018] The sealing portion is located at the bottom of the annular portion and seals a portion of the annular portion.

[0019] In some embodiments, the first bending portion includes:

[0020] a first arc-shaped portion, the first arc-shaped portion being connected to the annular portion;

[0021] a second arc-shaped portion, the second arc-shaped portion is connected to the first arc-shaped portion, and the second arc-shaped portion is further connected to the cavity through a fourth connecting portion;

[0022] a first straight portion, the first straight portion being connected to the second arc-shaped portion;

[0023] a third arc portion, the third arc portion being connected to the first straight portion;

[0024] A second straight portion, wherein the second straight portion is connected to the third arc portion and the first connecting portion respectively.

[0025] In some embodiments, the first arc-shaped portion is parallel to the axis of the tuning screw;

[0026] A tangent line at a connection between the second arc-shaped portion and the first arc-shaped portion is perpendicular to the first arc-shaped portion;

[0027] The first straight portion is parallel to the first arc-shaped portion, and a tangent line at a connection between the first straight portion and the second arc-shaped portion coincides with the first straight portion;

[0028] A tangent line at a connection point between the third arc-shaped portion and the first straight portion coincides with the first straight portion;

[0029] A tangent line at a connection point between the second straight portion and the third arc-shaped portion coincides with the second straight portion, and the second straight portion is perpendicular to the first arc-shaped portion.

[0030] In some embodiments, the cavity and the resonator group are integrally formed.

[0031] In some embodiments, the cavity has an integrally formed debugging cover, which is used to install a plurality of the tuning screws. The debugging cover is also used to install a plurality of coupling screws, and the axis of each coupling screw is perpendicular to a line connecting the center points of two adjacent resonators and is connected to the midpoint of the line connecting the center points.

[0032] According to a second aspect of the present invention, a communication device is provided, the communication device comprising the above-mentioned cavity filter.

[0033] Compared with the prior art, the cavity filter and communication equipment of the present invention are connected to the cavity through the first connecting part of the resonator located at the head end, and the second connecting part of the resonator located at the tail end is connected to the cavity, and the first connecting part of the rear resonator is connected to the second connecting part of the front resonator, so that multiple resonators can be connected to the cavity without a mounting structure, thereby solving the problem that the miniaturization of the cavity filter is hindered by setting an additional mounting structure for each resonator, and the problem that the additional multiple mounting structures will also increase material costs and installation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a cavity filter from a first viewing angle according to an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the overall structure of a cavity filter according to an embodiment of the present invention from a second viewing angle;

[0036] Figure 3 A schematic diagram of the overall structure of a cavity filter according to an embodiment of the present invention from a third viewing angle;

[0037] Figure 4 A cross-sectional view of a partial structure of a cavity filter according to an embodiment of the present invention;

[0038] Figure 5 is a schematic diagram of the overall structure of a resonator group according to an embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of the overall structure of a resonator according to one embodiment of the present invention.

[0040] Description of the accompanying drawings: cavity 10, first cavity portion 11, debugging cover 111, first screw hole portion 1111, second screw hole portion 1112, side cover 112, opening 113, second cavity portion 12, connecting cavity portion 13, gap 14, groove 15, resonator group 20, resonator 200, receiving portion 210, annular portion 211, circular ring portion 2111, sealing portion 2112, first bent portion 212, first arc portion 2121, second arc portion 2122, first straight portion 2123, third arc portion 2124, second straight portion 2125, second bent portion 213, first connecting portion 220, second connecting portion 230, third connecting portion 240, fourth connecting portion 250. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] An embodiment of the present invention provides a communication device, the communication device includes a cavity filter, such as Figure 1-6 As shown, the cavity filter includes a cavity 10 and a resonator group 20 arranged in the cavity 10 .

[0043] like Figure 1 and Figure 2 As shown, the cavity 10 includes a first cavity portion 11, a second cavity portion 12 and a connecting cavity portion 13. The first cavity portion 11 and the second cavity portion 12 are both roughly in the shape of a rectangular parallelepiped. The first cavity portion 11 and the second cavity portion 12 are arranged in parallel, and there is a certain distance between the first cavity portion 11 and the second cavity portion 12. The same-direction ends of the first cavity portion 11 and the second cavity portion 12 are connected through the connecting cavity portion 13 in the facing direction; two slits 14 are formed between the first cavity portion 11 and the second cavity portion 12 due to the connecting cavity portion 13, and the slits 14 can play a role in positioning or auxiliary fixation when the cavity filter is installed. In addition, grooves can be provided on the first cavity portion 11, the second cavity portion 12 and the connecting cavity portion 13, which can also play the above-mentioned role. For example, a groove 15 is provided on the surface of the second cavity portion 12 facing away from the first cavity portion 11.

[0044] like Figure 4 and Figure 5 As shown, the first cavity portion 11 and the second cavity portion 12 are respectively provided with a group of resonator groups 20. Since the first cavity portion 11 and the second cavity portion 12 are connected through the connecting cavity portion 13, the connecting component connecting the two groups of resonator groups 20 can be connected to one of the resonator groups 20 and then pass through the connecting cavity portion 13 to connect to the other group of resonator groups 20. In addition, the structures of the resonator groups 20 provided in the first cavity portion 11 and the second cavity portion 12 are the same. Therefore, when describing the resonator groups 20, the resonator groups 20 in the first cavity portion 11 are taken as an example, and the relationship between the second cavity portion 12 and the resonator groups 20 can refer to the relationship between the first cavity portion 11 and the resonator groups 20.

[0045] like Figure 4-Figure 6 As shown, the resonator group 20 includes a plurality of resonators 200 connected in sequence, and the plurality of resonators 200 respectively include a receiving portion 210, a first connecting portion 220 and a second connecting portion 230; wherein the receiving portion 210 forms the upper half of the resonator 200, and the upper half is for adjusting the space, and the first connecting portion 220 and the second connecting portion 230 form the lower half of the resonator 200, and the lower half is for adapting to the frequency.

[0046] like Figure 4-Figure 6 As shown, the receiving portion 210 is used to receive a tuning screw (not shown), and the receiving portion 210 includes an annular portion 211, a first bent portion 212 and a second bent portion 213. Specifically, the annular portion 211 includes a circular portion 2111 and a sealing portion 2112. The circular portion 2111 is in the shape of a circular ring, and the inner diameter of the circular portion 2111 is larger than the outer diameter of the tuning screw. The axis of the circular portion 2111 coincides with the axis of the tuning screw, that is, the axis of the tuning screw is directly opposite to the center of the circular portion 2111; the sealing portion 2112 is located at the bottom of the circular portion 2111 facing away from the tuning screw, and the sealing portion 2112 seals a portion of the circular portion 2111, so that a portion of the circular hole at the bottom of the circular portion 2111 is sealed.

[0047] like Figure 4-Figure 6 As shown, the first bending portion 212 is connected to the annular portion 211 and the first connecting portion 220 respectively; wherein the first bending portion 212 includes a first arc portion 2121 , a second arc portion 2122 , a first straight portion 2123 , a third arc portion 2124 and a second straight portion 2125 .

[0048] like Figure 4-Figure 6As shown, the first arc portion 2121 is connected to the annular portion 211. Specifically, the first arc portion 2121 is roughly an arc-shaped structure. The arc of the first arc portion 2121 is a minor arc. The arc of the first arc portion 2121 fits on the outer circumference of the annular portion 211, and extends from the outer circumference of the annular portion 2111 of the annular portion 211 along the axial direction of the tuning screw toward the tuning screw. The axis of the first arc portion 2121 is parallel to the axis of the tuning screw.

[0049] like Figure 4-Figure 6 As shown, the second arc portion 2122 is connected to the first arc portion 2121, and the second arc portion 2122 is also connected to the cavity 10 through the fourth connecting portion 250; specifically, the second arc portion 2122 is roughly a quarter of a circular ring, and the tangent at the connection between the second arc portion 2122 and the first arc portion 2121 is perpendicular to the first arc portion 2121. The second arc portion 2122 is farther away from the circular ring portion 2111 relative to the first arc portion 2121, and the fourth connecting portion 250 is roughly a sheet-like structure. The resonator 200 can be connected to the cavity 10 through the fourth connecting portion 250 on the second arc portion 2122.

[0050] like Figure 4-Figure 6 As shown, the first straight portion 2123 is connected to the second arc-shaped portion 2122; specifically, the first straight portion 2123 is roughly a sheet-like structure, the first straight portion 2123 is parallel to the axis of the first arc-shaped portion 2121, and the tangent line at the connection between the first straight portion 2123 and the second arc-shaped portion 2122 coincides with the first straight portion 2123; the first straight portion 2123 is farther away from the tuning screw than the first arc-shaped portion 2121 in the axial direction of the tuning screw.

[0051] like Figure 4-Figure 6 As shown, the third arc portion 2124 is connected to the first straight portion 2123; specifically, the third arc portion 2124 is roughly a quarter of a circular ring, the third arc portion 2124 and the second arc portion 2122 are symmetrical with respect to the perpendicular bisector of the first straight portion 2123, and the tangent of the connection between the third arc portion 2124 and the first straight portion 2123 coincides with the first straight portion 2123.

[0052] like Figure 4-Figure 6 As shown, the second straight portion 2125 is connected to the third arc-shaped portion 2124 and the first connecting portion 220 respectively. Specifically, the second straight portion 2125 is roughly a sheet-like structure, the tangent of the connection between the second straight portion 2125 and the third arc-shaped portion 2124 coincides with the second straight portion 2125, and the second straight portion 2125 is perpendicular to the first arc-shaped portion 2121.

[0053] like Figure 4-Figure 6As shown, the distance between the first arc portion 2121 of the first bending portion 212 and the first arc portion of the second bending portion 213 is slightly greater than or equal to the outer diameter of the annular portion 2111, and the distance between the first straight portion 2123 of the first bending portion 212 and the first straight portion of the second bending portion 213 is greater than the distance between the first arc portion 2121 of the first bending portion 212 and the first arc portion of the second bending portion 213.

[0054] like Figure 4-Figure 6 As shown, the second bending portion 213 is connected to the annular portion 211 and the second connecting portion 230 respectively, and the second bending portion 213 and the first bending portion 212 are symmetrical with respect to the axis of the annular portion 211, that is, the second bending portion 213 and the first bending portion 212 have the same structure, but are different in orientation. Therefore, the specific structure of the second bending portion 213 can refer to the first bending portion 212, so it will not be repeated here.

[0055] like Figure 4-Figure 6 As shown, the first connection part 220 is generally a sheet-like structure, the first connection part 220 is parallel to the axis of the tuning screw, and the first connection part 220 of the resonator 200 located at the head end is used to connect the cavity 10; the second connection part 230 is generally a sheet-like structure, the second connection part 230 is parallel to the first connection part 220, and the second connection part 230 of the resonator 200 located at the tail end is used to connect the cavity 10. Among the multiple resonators 200 connected in sequence, the first connection part 220 of the latter resonator 200 is connected to the second connection part 230 of the former resonator 200, and the distance between the first connection part 220 and the second connection part 230 is less than the distance between the first arc portion 2121 of the first bending portion 212 and the first arc portion of the second bending portion 213. If the resonant frequency of each resonator 200 needs to be changed, the width of the upper half of the resonator 200 or the shape of the lower half of the resonator 200 can be changed.

[0056] Further, as 4 and Figure 5 As shown, the resonator group 20 also includes a plurality of third connecting parts 240, which are roughly sheet-like structures. The first connecting part 220 of the latter resonator 200 is connected to the second connecting part 230 of the former resonator 200 through the third connecting part 240, and the third connecting part 240 is perpendicular to the first connecting part 220.

[0057] In an optional embodiment, if Figure 4 and Figure 5 As shown, the multiple resonators 200 in the resonator group 20 are integrally formed. The resonator group 20 integrally formed can reduce the assembly time of the multiple resonators 200 to form the resonator group 20, thereby reducing the production cost of the product.

[0058] In an optional embodiment, if Figure 1 , Figure 3 and Figure 4 As shown, the cavity 10 has an integrally formed debugging cover 111, and the cavity 10 and the resonator group 20 are integrally formed. Specifically, the side of the first cavity part 11 has a side cover 112 and the bottom has an opening 113. During production, the side cover 112 is separated from the first cavity part 11. At this time, the first cavity part 11 is connected to the outside through the side. At this time, the first cavity part 11, the debugging cover 111 and the resonator group 20 can be integrally formed by a mold. After molding, the side of the first cavity part 11 can be demolded. After demolding, the side cover 112 is welded to the cavity 10 by welding or the like to close the side of the cavity 10, so that the cavity 10, the debugging cover 111, and the resonator 200 can be exempted from assembly at the same time, further reducing the assembly time and production cost. At the same time, it can have richer shapes, form richer frequency bands, and achieve lower frequencies and greater cavity power tolerance; the two main indicators of the cavity filter, tuning frequency and input power, are improved. After the two resonator groups 20 are connected in series, two transmission lines are connected to form a passband. The two transmission lines can extend through the opening 113. In addition, the two transmission lines can also extend through a through hole provided on the side wall of the cavity 10. It should be noted that for the cavity 10, the debugging cover 111, and the resonator 200, any two or three of them can be integrally formed by a mold as needed.

[0059] In some embodiments, Figure 1 and Figure 4As shown, the debugging cover 111 is parallel to the annular portion 2111, and the debugging cover 111 is used to install a plurality of tuning screws. The debugging cover 111 is also used to install a plurality of coupling screws. Specifically, the debugging cover 111 has a plurality of first screw hole portions 1111 and a plurality of second screw hole portions 1112. The first screw hole portions 1111 are used to install the tuning screws, and the second screw hole portions 1112 are used to install the coupling screws. The first screw hole portions 1111 and the second screw hole portions 1112 are arranged at intervals, and when corresponding to one group of resonator groups 20, the number of the first screw hole portions 1111 is one less than the number of the second screw hole portions 1112. If there are two groups of resonator groups 20, the number of the first screw hole portions 1111 is two less than the number of the second screw hole portions 1112, that is, the first screw hole portions 1111 and the second screw hole portions 1112 are arranged at intervals. The arrangement order of the screw hole portion 1111 and the second screw hole portion 1112 is the first screw hole portion 1111, the second screw hole portion 1112, the first screw hole portion 1111, the second screw hole portion 1112, ..., the first screw hole portion 1111. The axis of the first screw hole portion 1111 (i.e., the axis of the tuning screw) coincides with the axis of the annular portion 2111 to ensure the debugging space; the axis of the second screw hole portion 1112 is perpendicular to the line connecting the center points of two adjacent resonators and is connected to the midpoint of the line connecting the center points, that is, the axis of each coupling screw is perpendicular to the line connecting the center points of two adjacent resonators 200 and is connected to the midpoint of the line connecting the center points. The center points of the two resonators 200 fall on the axes of their respective annular portions 2111 to ensure a safe debugging distance for the screw.

[0060] In this embodiment, the first connecting portion 220 of the resonator 200 located at the head end is connected to the cavity 10, and the second connecting portion 230 of the resonator 200 located at the tail end is connected to the cavity 10, and the first connecting portion 220 of the latter resonator 200 is connected to the second connecting portion 230 of the former resonator 200, so that multiple resonators 200 can be connected to the cavity 10 without a mounting structure, thereby solving the problem that the miniaturization of the cavity filter is hindered by setting an additional mounting structure for each resonator 200, and the problem that the additional multiple mounting structures will also increase the material cost and installation time; the cavity 10, the debugging cover 111, and the resonator 200 are integrally formed, which can further reduce the assembly time and assembly materials, thereby reducing the production cost of the product. The debugging cover 111 does not require welding, which can improve the intermodulation pass rate. The integrated resonator 200 and the debugging cover 111 make the product performance more stable and easier to debug in the actual production process.

[0061] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A cavity filter, characterized in that: The invention comprises a cavity and a resonator group arranged in the cavity, wherein the resonator group comprises a plurality of resonators connected in sequence, and the plurality of resonators respectively comprise: A receiving portion, the receiving portion being used to receive a tuning screw; A first connecting portion, the first connecting portion of the resonator located at the head end is used to connect to the cavity; The second connection portion, the second connection portion of the resonator located at the tail end is used to connect to the cavity, wherein the first connection portion of the latter resonator is connected to the second connection portion of the former resonator.

2. The cavity filter according to claim 1, characterized in that: The first connection portion of the latter resonator is connected to the second connection portion of the former resonator via a third connection portion, and the third connection portion is perpendicular to the first connection portion.

3. The cavity filter according to claim 1, characterized in that: The first connection portion is parallel to the second connection portion, and the first connection portion is parallel to an axis of the tuning screw.

4. The cavity filter according to any one of claims 1 to 3, characterized in that: The receiving portion comprises: annular part; a first bending portion, wherein the first bending portion is connected to the annular portion and the first connecting portion respectively; The second bending portion is connected to the annular portion and the second connecting portion respectively, and the second bending portion and the first bending portion are symmetrical with respect to the axis of the annular portion.

5. The cavity filter according to claim 4, characterized in that: The annular portion comprises: A circular ring portion, wherein the axis of the circular ring portion coincides with the axis of the tuning screw; The sealing portion is located at the bottom of the annular portion and seals a portion of the annular portion.

6. The cavity filter according to claim 4, characterized in that: The first bending portion comprises: a first arc-shaped portion, the first arc-shaped portion being connected to the annular portion; a second arc-shaped portion, the second arc-shaped portion is connected to the first arc-shaped portion, and the second arc-shaped portion is further connected to the cavity through a fourth connecting portion; a first straight portion, the first straight portion being connected to the second arc-shaped portion; a third arc portion, the third arc portion being connected to the first straight portion; A second straight portion, wherein the second straight portion is connected to the third arc portion and the first connecting portion respectively.

7. The cavity filter according to claim 6, characterized in that: The first arc portion is parallel to the axis of the tuning screw; A tangent line at a connection between the second arc-shaped portion and the first arc-shaped portion is perpendicular to the first arc-shaped portion; The first straight portion is parallel to the first arc-shaped portion, and a tangent line at a connection between the first straight portion and the second arc-shaped portion coincides with the first straight portion; A tangent line at a connection point between the third arc-shaped portion and the first straight portion coincides with the first straight portion; A tangent line at a connection point between the second straight portion and the third arc-shaped portion coincides with the second straight portion, and the second straight portion is perpendicular to the first arc-shaped portion.

8. The cavity filter according to any one of claims 1 to 3 and 5 to 7, characterized in that: The cavity and the resonator group are integrally formed.

9. The cavity filter according to any one of claims 1-3, 5-7, characterized in that: The cavity has an integrally formed debugging cover, which is used to install multiple tuning screws. The debugging cover is also used to install multiple coupling screws, and the axis of each coupling screw is perpendicular to the center point line of two adjacent resonators and is connected to the midpoint of the center point line.

10. A communication device, characterized in that: A cavity filter comprising the cavity filter described in any one of claims 1 to 9.

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