A cavity filter and a communication device

Abstract

The application discloses a cavity filter and a communication device, 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. The receiving part is used for receiving a tuning screw. The first connecting part of a resonator at a head end is used for connecting the cavity. The second connecting part of a resonator at a tail end is used for connecting the cavity. The first connecting part of a subsequent resonator is connected with the second connecting part of a previous resonator, so that the plurality of resonators can be connected with the cavity without a mounting structure. Thus, the miniaturization of the cavity filter is not hindered by the mounting structure arranged for each resonator. In addition, the plurality of mounting structures increases the material cost and the mounting time.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a cavity filter and communication device. Background Technology

[0002] Currently, most base station cavity filters on the market are metal cavity filters, dielectric cavity filters, and dielectric waveguide filters. However, due to different development philosophies of each company, their product design directions also differ. For the rapidly developing 5G base stations, there are two main types of base station filters: miniaturized metal filters and ceramic dielectric filters. The former is a transitional solution from 4G to 5G, while the latter is likely to be the mainstream solution for future base station filters. Currently, apart from Huawei's more aggressive application of ceramic dielectric filters, most other main equipment vendors, such as ZTE, Ericsson, and Nokia, are choosing to pursue both approaches, initially adopting miniaturized metal cavity filters in the early stages of 5G commercialization.

[0003] Existing miniaturized metal cavity filters contain multiple resonators within the cavity. To accommodate these resonators, an additional mounting structure is required for each resonator. These additional mounting structures inevitably occupy space within the cavity, hindering the miniaturization of the cavity filter. Furthermore, the additional mounting structures also increase material costs and installation time. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a cavity filter and communication device to solve the problems caused by having to set up 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 disposed within the cavity, the resonator group comprising a plurality of resonators connected in sequence, the plurality of resonators comprising:

[0006] The receiving part is used to receive the tuning screw;

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

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

[0009] The cavity filter of the present invention connects to the cavity through a first connecting part of a resonator located at the first end and a second connecting part of a resonator located at the tail end. The first connecting part of the subsequent resonator is connected to the second connecting part of the previous resonator, so that multiple resonators can be connected to the cavity without the need for an installation structure. This solves the problem that the miniaturization of the cavity filter is hindered by setting an additional installation structure for each resonator, and that the additional installation structures would 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 connecting portion is parallel to the second connecting portion, and the first connecting portion is parallel to the axis of the tuning screw.

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

[0013] Annular portion;

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

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

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

[0017] The annular portion has its axis coincident with the axis of the tuning screw;

[0018] A sealing portion, which is located at the bottom of the annular portion and seals off a portion of the annular portion.

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

[0020] A first arc-shaped portion, which is connected to the annular portion;

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

[0022] The first straight part is connected to the second arc-shaped part;

[0023] The third arc-shaped portion is connected to the first straight portion;

[0024] The second straight part is connected to the third arc-shaped part and the first connecting part, respectively.

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

[0026] The tangent at the junction of the second arc-shaped portion and the first arc-shaped portion is perpendicular to the first arc-shaped portion;

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

[0028] The tangent at the connection between the third arc-shaped portion and the first straight portion coincides with the first straight portion.

[0029] The tangent at the junction of the second straight part and the third arc-shaped part coincides with the second straight part, and the second straight part is perpendicular to the first arc-shaped part.

[0030] In some embodiments, the cavity is integrally formed with the resonator assembly.

[0031] In some embodiments, the cavity has an integrally formed tuning cover plate for mounting a plurality of the tuning screws, and the tuning cover plate is also used for mounting a plurality of coupling screws, the axis of each coupling screw being perpendicular to the line connecting the center points of two adjacent resonators and 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 cavity filter described above.

[0033] Compared with the prior art, the cavity filter and communication device of the present invention connect the cavity through the first connection part of the resonator located at the first end and the second connection part of the resonator located at the tail end. The first connection part of the subsequent resonator is connected to the second connection part of the previous resonator, so that multiple resonators can be connected to the cavity without the need for an installation structure. This solves the problem that the miniaturization of the cavity filter is hindered by setting an additional installation structure for each resonator. At the same time, the additional installation structures will also increase the material cost and installation time. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of a cavity filter according to an embodiment of the present invention from a first-view perspective.

[0035] Figure 2 This is a schematic diagram of the overall structure of a cavity filter according to an embodiment of the present invention from a second perspective.

[0036] Figure 3 This is a schematic diagram of the overall structure of a cavity filter according to an embodiment of the present invention from a third-view perspective.

[0037] Figure 4 This is a cross-sectional view of a portion of the structure of a cavity filter according to an embodiment of the present invention.

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

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

[0040] Reference numerals: Cavity 10, First Cavity Section 11, Adjustment Cover Plate 111, First Screw Hole Section 1111, Second Screw Hole Section 1112, Side Cover Plate 112, Opening 113, Second Cavity Section 12, Connecting Cavity Section 13, Gap 14, Groove 15, Resonator Group 20, Resonator 200, Receiving Section 210, Annular Section 211, Circular Section 2111, Sealing Section 2112, First Bending Section 212, First Arc-shaped Section 2121, Second Arc-shaped Section 2122, First Straight Section 2123, Third Arc-shaped Section 2124, Second Straight Section 2125, Second Bending Section 213, First Connecting Section 220, Second Connecting Section 230, Third Connecting Section 240, Fourth Connecting Section 250. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings.

[0042] This invention provides a communication device, which includes a cavity filter, such as... Figure 1-6 As shown, the cavity filter includes a cavity 10 and a resonator group 20 disposed within 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. Both the first cavity portion 11 and the second cavity portion 12 are approximately rectangular in shape. The first cavity portion 11 and the second cavity portion 12 are arranged in parallel and have a certain distance between them. The same-direction ends of the first cavity portion 11 and the second cavity portion 12 are connected in the facing direction through the connecting cavity portion 13. Two gaps 14 are formed between the first cavity portion 11 and the second cavity portion 12 due to the connecting cavity portion 13. The gaps 14 can play a positioning or auxiliary fixing role 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 to achieve the same function. For example, a groove 15 can be 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, a set of resonator groups 20 are respectively provided in the first cavity 11 and the second cavity 12. Since the first cavity 11 and the second cavity 12 are connected by a connecting cavity 13, the connecting component connecting the two sets of resonator groups 20 can be connected to one set of resonator groups 20, then pass through the connecting cavity 13 and connect to the other set of resonator groups 20. Furthermore, the resonator groups 20 provided in the first cavity 11 and the second cavity 12 have the same structure. Therefore, when describing the resonator groups 20, the resonator group 20 in the first cavity 11 is taken as an example, and the relationship between the second cavity 12 and the resonator groups 20 can be referenced to the relationship between the first cavity 11 and the resonator groups 20.

[0045] like Figures 4-6 As shown, the resonator group 20 includes a plurality of resonators 200 connected in sequence. Each of the plurality of resonators 200 includes a receiving part 210, a first connecting part 220, and a second connecting part 230. The receiving part 210 forms the upper half of the resonator 200, which is used for adjustment space. The first connecting part 220 and the second connecting part 230 form the lower half of the resonator 200, which is used to adapt to the frequency.

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

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

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

[0049] like Figures 4-6 As shown, the second arc-shaped portion 2122 is connected to the first arc-shaped portion 2121, and the second arc-shaped portion 2122 is also connected to the cavity 10 through the fourth connecting portion 250. Specifically, the second arc-shaped portion 2122 is approximately a quarter-circular ring, the tangent at the connection between the second arc-shaped portion 2122 and the first arc-shaped portion 2121 is perpendicular to the first arc-shaped portion 2121, the second arc-shaped portion 2122 is further away from the annular portion 2111 than the first arc-shaped portion 2121, the fourth connecting portion 250 is approximately a sheet-like structure, and the resonator 200 can be connected to the cavity 10 through the fourth connecting portion 250 on the second arc-shaped portion 2122.

[0050] like Figures 4-6 As shown, the first straight portion 2123 is connected to the second arc-shaped portion 2122; specifically, the first straight portion 2123 is generally a sheet-like structure, the first straight portion 2123 is parallel to the axis of the first arc-shaped portion 2121, and the tangent 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 Figures 4-6 As shown, the third arc-shaped portion 2124 is connected to the first straight portion 2123; specifically, the third arc-shaped portion 2124 is approximately a quarter-circle shape, the third arc-shaped portion 2124 and the second arc-shaped portion 2122 are symmetrical with respect to the perpendicular bisector of the first straight portion 2123, and the tangent at the connection between the third arc-shaped portion 2124 and the first straight portion 2123 coincides with the first straight portion 2123.

[0052] like Figures 4-6 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 at 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 Figures 4-6As shown, the distance between the first arcuate portion 2121 of the first bent portion 212 and the first arcuate portion of the second bent 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 bent portion 212 and the first straight portion of the second bent portion 213 is greater than the distance between the first arcuate portion 2121 of the first bent portion 212 and the first arcuate portion of the second bent portion 213.

[0054] like Figures 4-6 As shown, the second bent portion 213 is connected to the annular portion 211 and the second connecting portion 230 respectively, and the second bent portion 213 and the first bent portion 212 are symmetrical with respect to the axis of the annular portion 211. That is, the second bent portion 213 and the first bent portion 212 have the same structure, only in different orientations. Therefore, the specific structure of the second bent portion 213 can be referred to the first bent portion 212, and will not be described in detail here.

[0055] like Figures 4-6 As shown, the first connecting portion 220 is generally a sheet-like structure, parallel to the axis of the tuning screw. The first connecting portion 220 of the resonator 200 at the first end is used to connect to the cavity 10. The second connecting portion 230 is also generally a sheet-like structure, parallel to the first connecting portion 220. The second connecting portion 230 of the resonator 200 at the tail end is used to connect to the cavity 10. In the sequentially connected resonators 200, the first connecting portion 220 of the subsequent resonator 200 is connected to the second connecting portion 230 of the preceding resonator 200. The distance between the first connecting portion 220 and the second connecting portion 230 is less than the distance between the first arcuate portion 2121 of the first bent portion 212 and the first arcuate portion of the second bent portion 213. The resonant frequency of each resonator 200 can be changed by altering the width of the upper half or the shape of the lower half of the resonator 200.

[0056] Furthermore, such as Figure 4 and Figure 5 As shown, the resonator group 20 also includes a plurality of third connecting portions 240. The third connecting portions 240 are generally sheet-like structures. The first connecting portion 220 of the subsequent resonator 200 and the second connecting portion 230 of the preceding resonator 200 are connected through the third connecting portions 240, and the third connecting portions 240 are perpendicular to the first connecting portions 220.

[0057] In one alternative implementation, such as Figure 4 and Figure 5 As shown, the multiple resonators 200 in the resonator group 20 are integrally formed. The integrally formed resonator group 20 can reduce the assembly time of multiple resonators 200 to form the resonator group 20, thereby reducing the product manufacturing cost.

[0058] In one alternative implementation, such as Figure 1 , Figure 3 and Figure 4 As shown, the cavity 10 has an integrally formed tuning cover 111. The cavity 10 and the resonator group 20 are integrally formed. Specifically, the side of the first cavity 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 11. At this time, the first cavity 11 is connected to the outside through the side. The first cavity 11, the tuning cover 111 and the resonator group 20 can be integrally formed by mold. After forming, the mold can be pulled out through the side of the first cavity 11. After pulling out, the side cover 112 is welded to the cavity 10 by welding or other methods to close the side of the cavity 10. This eliminates the need for assembly of the cavity 10, the tuning cover 111 and the resonator 200, further reducing assembly time and production costs. At the same time, it allows for richer shapes, forms richer frequency bands, and achieves lower frequency cavity power handling capacity. It improves the two main indicators of the cavity filter, the tuning frequency and the input power. Two sets of resonators 20 are connected in series and then connected to two transmission lines to form a passband. These two transmission lines can extend through the opening 113. Alternatively, the two transmission lines can extend through through holes provided in the side wall of the cavity 10. It should be noted that, for the cavity 10, the adjustment cover plate 111, and the resonator 200, any two or three of them can be integrally formed by mold as needed.

[0059] In some implementations, such as Figure 1 and Figure 4As shown, the tuning cover 111 is parallel to the annular portion 2111. The tuning cover 111 is used to install multiple tuning screws and multiple coupling screws. Specifically, the tuning cover 111 has multiple first screw hole portions 1111 and multiple second screw hole portions 1112. The first screw hole portions 1111 are used to install tuning screws, and the second screw hole portions 1112 are used to install coupling screws. The first screw hole portions 1111 and the second screw hole portions 1112 are spaced apart. When corresponding to a set of resonator groups 20, the number of first screw hole portions 1111 is one less than the number of second screw hole portions 1112. For two sets of resonator groups 20, the number of first screw hole portions 1111 is two less than the number of second screw hole portions 1112. The arrangement order of part 1111 and the second screw hole part 1112 is: first screw hole part 1111, second screw hole part 1112, first screw hole part 1111, second screw hole part 1112, ..., first screw hole part 1111. The axis of the first screw hole part 1111 (i.e., the axis of the tuning screw) coincides with the axis of the ring part 2111 to ensure the adjustment space. The axis of the second screw hole part 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 axis of their respective ring parts 2111 to ensure the safe adjustment distance of the screw.

[0060] In this embodiment, the resonator 200 at the first end is connected to the cavity 10 via a first connecting portion 220, and the resonator 200 at the last end is connected to the cavity 10 via a second connecting portion 230. The first connecting portion 220 of the subsequent resonator 200 is connected to the second connecting portion 230 of the preceding resonator 200. This allows multiple resonators 200 to be connected to the cavity 10 without the need for an additional mounting structure. This solves the problem of miniaturization being hindered by setting an additional mounting structure for each resonator 200, and also addresses the issue that additional mounting structures would increase material costs and installation time. By integrally molding the cavity 10, the tuning cover 111, and the resonator 200, assembly time and materials can be further reduced, thus lowering product production costs. The tuning cover 111 is weld-free, which can improve intermodulation pass rate. The integrated resonator 200 and tuning cover 111 result in more stable product performance and easier debugging during actual production.

[0061] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A cavity filter, characterized in that, The system includes a cavity and a resonator group disposed within the cavity. The resonator group includes multiple resonators connected in sequence, and each of the multiple resonators includes: The receiving part is used to receive the tuning screw; The first connecting portion, located at the head end of the resonator, is used to connect to the cavity; The second connecting portion, located at the tail end of the resonator, is used to connect to the cavity, wherein the first connecting portion of the latter resonator is connected to the second connecting portion of the former resonator; The receiving part includes: Annular portion; the annular portion includes: The annular portion has its axis coincident with the axis of the tuning screw; A sealing portion, wherein the sealing portion is located at the bottom of the annular portion and seals off a portion of the annular portion; The first bending portion includes: A first arc-shaped portion, which is connected to the annular portion; The second arc-shaped portion is connected to the first arc-shaped portion, and the second arc-shaped portion is also connected to the cavity through the fourth connecting portion; The first straight part is connected to the second arc-shaped part; The third arc-shaped portion is connected to the first straight portion; The second straight part is connected to the third arc-shaped part and the first connecting part respectively; The second bend is connected to the annular portion and the second connecting portion, respectively, and the second bend is symmetrical to the first bend with respect to the axis of the annular portion.

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 connecting part is parallel to the second connecting part, and the first connecting part is parallel to the axis of the tuning screw.

4. The cavity filter according to claim 1, characterized in that, The first arc-shaped portion is parallel to the axis of the tuning screw; The tangent at the junction of the second arc-shaped portion and the first arc-shaped portion is perpendicular to the first arc-shaped portion; The first straight part is parallel to the first arc-shaped part, and the tangent at the connection between the first straight part and the second arc-shaped part coincides with the first straight part; The tangent at the connection between the third arc-shaped portion and the first straight portion coincides with the first straight portion. The tangent at the junction of the second straight part and the third arc-shaped part coincides with the second straight part, and the second straight part is perpendicular to the first arc-shaped part.

5. The cavity filter according to any one of claims 1-4, characterized in that, The cavity and the resonator assembly are integrally formed.

6. The cavity filter according to any one of claims 1-4, characterized in that, The cavity has an integrally formed tuning cover plate, which is used to install multiple tuning screws and multiple coupling screws. The axis of each coupling screw 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.

7. A communication device, characterized in that, Includes the cavity filter as described in any one of claims 1-6.

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