Filter

Abstract

The utility model relates to the field of communication, and provides a filter, which comprises a filter shell, a resonance rod and a capacitive coupling structure, and is characterized in that the filter shell is provided with a first plate and a second plate which are oppositely arranged; the plurality of resonance rods are arranged in the filter shell, the resonance rods are connected to the first plate and spaced from the second plate, and the plurality of resonance rods comprise at least one group of first resonance rods and second resonance rods; the number of the capacitive coupling structures is at least one, the capacitive coupling structures are arranged between the first resonance rod and the second resonance rod and enable the first resonance rod and the second resonance rod to be in capacitive coupling, each capacitive coupling structure comprises a first coupling piece and a second coupling piece, the first coupling piece is connected to the first plate piece and extends towards the second plate piece, and the second coupling piece is connected to the second plate piece. The second coupling piece is connected to the second plate piece and extends towards the first plate piece, and the first coupling piece abuts against the second coupling piece. The capacitive coupling structure of the filter can be simplified and optimized, the number of parts and assembly materials can be reduced, and the assembly process can be simplified.

Description

Technical Field

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

[0002] In some cases, a filter includes a filter housing, multiple resonant rods all disposed within the filter housing, and at least one capacitive coupling structure. The capacitive coupling structure is located between two resonant rods to achieve capacitive coupling between them. The capacitive coupling structure includes an insulating bracket, a fly rod, a fastening screw, and a fastening nut. The insulating bracket is fixed to the wall of the filter housing by the fastening screw and nut. The fly rod is engaged with the insulating bracket and extends between the two resonant rods to achieve capacitive coupling. However, this capacitive coupling structure has a large number of components and assembly materials, resulting in a complex structure and complicated assembly. Utility Model Content

[0003] This application provides a filter that aims to solve the problems of existing filters having a large number of components and assembly materials, complex structure, and complicated assembly due to capacitive coupling structures.

[0004] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows:

[0005] Firstly, a filter is provided, comprising:

[0006] The filter housing has a first plate and a second plate arranged opposite to each other;

[0007] Multiple resonant rods are provided and disposed within the filter housing. The resonant rods are connected to the first plate and spaced apart from the second plate. The multiple resonant rods include at least one set of first resonant rods and second resonant rods.

[0008] A capacitive coupling structure is provided, at least one of which is disposed between the first resonant rod and the second resonant rod, thereby capacitively coupling the first resonant rod and the second resonant rod. The capacitive coupling structure includes a first coupling member and a second coupling member. The first coupling member is connected to the first plate and extends toward the second plate, and the second coupling member is connected to the second plate and extends toward the first plate. The first coupling member and the second coupling member abut against each other.

[0009] In some embodiments, the first coupling member is integrally connected to the first plate;

[0010] And / or, the second coupling member is integrally connected to the second plate.

[0011] In some embodiments, the first coupling member is arranged near the first resonant rod and away from the second resonant rod, and the second coupling member is arranged near the second resonant rod and away from the first resonant rod.

[0012] In some embodiments, the first coupling member abuts against the outer peripheral wall of the first resonant rod and is spaced apart from the outer peripheral wall of the second resonant rod.

[0013] In some embodiments, the first coupling member, the first resonant rod, the second resonant rod, and the first plate are an integrated structure.

[0014] In some embodiments, at least one of the resonant rods is provided with an annular structure on its outer periphery, the annular structure being connected to the second plate, and the inner ring wall of the annular structure being spaced apart from the outer peripheral wall of the corresponding resonant rod.

[0015] In some embodiments, a first annular structure is sleeved on the outer periphery of the first resonant rod, the first annular structure is connected to the second plate, and the inner ring wall of the first annular structure is spaced apart from the outer peripheral wall of the first resonant rod.

[0016] The second resonant rod is fitted with a second annular structure on its outer periphery. The second annular structure is connected to the second plate. The inner ring wall of the second annular structure is spaced apart from the outer peripheral wall of the second resonant rod.

[0017] The second coupling member abuts against the outer ring wall of the second annular structure and is spaced apart from the outer ring wall of the first annular structure.

[0018] In some embodiments, the second coupling member, the first annular structure, the second annular structure, and the second plate are an integrated structure.

[0019] In some embodiments, the first coupling member and the second coupling member are welded and fixed together.

[0020] In some embodiments, one of the first coupling member and the second coupling member is provided with a stop, and the other of the first coupling member and the second coupling member is positioned to abut against the stop;

[0021] And / or, the outer surface of the filter housing is provided with a cavity, which is not connected to the interior of the filter housing.

[0022] The beneficial effects of the filter provided in this application are as follows:

[0023] The filter provided in this application embodiment can be provided with a capacitive coupling structure between the first resonant rod and the second resonant rod to achieve capacitive coupling between the first resonant rod and the second resonant rod. Specifically, the capacitive coupling structure can be connected and fixed to a first plate and grounded via a first coupling member, and connected and fixed to a second plate and grounded via a second coupling member. The first and second coupling members can extend towards each other and abut against each other, so that the entire capacitive coupling structure can be grounded between the first and second plates. This ensures that both ends of the capacitive coupling structure are grounded, thereby enabling the capacitive coupling structure to reliably and stably achieve capacitive coupling between the first and second resonant rods instead of inductive coupling. Based on this, the capacitive coupling structure can achieve capacitive coupling between the first resonant rod and the second resonant rod using only two components: the first coupling element and the second coupling element. Compared with the capacitive coupling structure of existing filters, at least components such as insulating brackets, fastening screws, and fastening nuts can be omitted. Therefore, the capacitive coupling structure of this embodiment can simplify and optimize the structure, reduce the number of parts and assembly materials, and simplify and optimize the assembly process. This simplifies the filter structure, facilitates the miniaturization, simplification, and lightweighting of the filter, and improves the integration, consistency, and reliability of the filter. It also simplifies the filter assembly process, improves the assembly convenience and efficiency of the filter, facilitates mass production of the filter, and helps reduce the material and production costs of the filter. Furthermore, it allows the filter to build a stable and reliable capacitive coupling relationship as needed through the capacitive coupling structure, and can maintain and optimize the filter's filtering performance and frequency selectivity characteristics. Attached Figure Description

[0024] To clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional schematic diagram of a filter provided in some embodiments of this application;

[0026] Figure 2 for Figure 1 A top view of the provided filter;

[0027] Figure 3 for Figure 2 The provided cross-sectional view along AA shows that the first resonant rod and the second resonant rod are two adjacent resonant rods.

[0028] Figure 4 A front view of a filter provided for other embodiments of this application;

[0029] Figure 5 for Figure 4 The provided cross-sectional view along BB shows that the first resonant rod and the second resonant rod are two non-adjacent resonant rods.

[0030] Figure 6 The image shows a cross-sectional view of a filter provided in some other embodiments of this application, wherein the filter housing has a cavity in the region corresponding to the resonant rod, the first coupling member, and the second coupling member.

[0031] The following are the labeling elements in the figure:

[0032] 10-Filter housing, 11-First plate, 12-Second plate, 13-Housing body, 14-Inner cavity, 15-Concave cavity, 16-Coupling window, 20-Resonant rod, 20a-First resonant rod, 20b-Second resonant rod, 30-Capacitive coupling structure, 31-First coupling element, 32-Second coupling element, 311-Stop, 40-Annular structure, 40a-First annular structure, 40b-Second annular structure, 50-Coupling rib, 60-Coupling adjustment structure. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clear, the application will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application. Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0034] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In some cases, a filter includes a filter housing, multiple resonant rods all disposed within the filter housing, and at least one capacitive coupling structure. The capacitive coupling structure is located between two resonant rods to achieve capacitive coupling between them. The capacitive coupling structure includes an insulating bracket, a fly rod, a fastening screw, and a fastening nut. The insulating bracket is fixed to the wall of the filter housing by the fastening screw and nut. The fly rod is engaged with the insulating bracket and extends between the two resonant rods to achieve capacitive coupling. However, this capacitive coupling structure has a large number of components and assembly materials, resulting in a complex structure and complicated assembly.

[0038] The embodiments provided in this application will solve the above problems.

[0039] To illustrate the technical solutions provided in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0040] Please see Figure 1 , Figure 2 , Figure 3 Some embodiments of this application provide a filter, including a filter housing 10, resonant rods 20, and a capacitive coupling structure 30. The filter housing 10 has a first plate 11 and a second plate 12 disposed opposite to each other. Multiple resonant rods 20 are provided and disposed within the filter housing 10. The resonant rods 20 are connected to the first plate 11 and spaced apart from the second plate 12. The multiple resonant rods 20 include at least one set of first resonant rods 20a and second resonant rods 20b. At least one capacitive coupling structure 30 is provided and disposed between the first resonant rods 20a and the second resonant rods 20b, thereby capacitively coupling the first resonant rods 20a and the second resonant rods 20b. The capacitive coupling structure 30 includes a first coupling member 31 and a second coupling member 32. The first coupling member 31 is connected to the first plate 11 and extends toward the second plate 12. The second coupling member 32 is connected to the second plate 12 and extends toward the first plate 11. The first coupling member 31 and the second coupling member 32 abut against each other.

[0041] It should be noted that the filter housing 10 has a closed inner cavity 14, which can achieve a shielding function and prevent signal leakage. This inner cavity 14 can be divided into at least one resonant cavity, which can accommodate the resonant rod 20.

[0042] The filter housing 10 has a first plate 11 on one side and a second plate 12 on the opposite side. In practical applications, the filter can be placed with the second plate 12 facing upwards, or with the second plate 12 facing left, right, forward, or backward.

[0043] In some embodiments, the filter housing 10 further includes a housing body 13 connected between the first plate 11 and the second plate 12, wherein the second plate 12, the housing body 13, and the first plate 11 together enclose a closed inner cavity 14. The housing body 13 is integrally connected to the second plate 12 and separately connected to the first plate 11; or, the housing body 13 is separately connected to the second plate 12 and integrally connected to the first plate 11; or, the housing body 13 is separately connected to the second plate 12 and separately connected to the first plate 11; this embodiment does not impose any limitations on these aspects.

[0044] In addition, the shape, size, and material of the filter housing 10 can be flexibly set as needed.

[0045] It should also be noted that at least two resonant rods 20 are provided. Each resonant rod 20 is located inside the filter housing 10. Please refer to the following: Figure 4 , Figure 5 Each resonant rod 20 can be located in the same column or in different columns. The resonant rods 20 can be coupled together using, but not limited to, capacitive coupling structures 30, coupling ribs 50, coupling windows 16, etc. Each resonant rod 20 has a resonant frequency within the filter passband, and each resonant rod 20 can perform signal filtering and frequency selection.

[0046] Each resonant rod 20 is connected and fixed to the first plate 11. That is, one end of the resonant rod 20 can be directly connected and fixed to the first plate 11 or via other components to fix it relative to the filter housing 10. The resonant rod 20 can be directly connected and fixed to the first plate 11 by means of, but not limited to, integral connection, welding, riveting, crimping, plugging, screw fastening, threaded connection, snap-fit, etc., or it can be indirectly connected and fixed to the first plate 11 via other structures connected to it (such as base, mounting post, coupling rib 50, etc.).

[0047] Each resonant rod 20 is spaced apart from the second plate 12. That is, the end of the resonant rod 20 away from the first plate 11 is spaced apart from the second plate 12, and a parallel plate capacitor is formed therebetween.

[0048] The resonant rod 20 can be a metal resonant rod, a ceramic dielectric resonant rod, or a dielectric resonant rod made of other materials. The resonant rod 20 can be a columnar resonant rod, a cylindrical resonant rod, an irregularly shaped resonant rod, a sheet metal resonant rod, or other forms. The resonant rod 20 can be with or without a resonant disk. The resonant disk can be with or without a flange. This embodiment does not impose any restrictions on this.

[0049] It should also be noted that, among each resonant rod 20, there is at least one combination of "first resonant rod 20a and second resonant rod 20b", where first resonant rod 20a and second resonant rod 20b refer to two resonant rods 20 that achieve capacitive coupling via capacitive coupling structure 30.

[0050] Among them, such as Figure 3 As shown, the first resonant rod 20a and the second resonant rod 20b can be two adjacent resonant rods 20. Two adjacent resonant rods 20 mean that these two resonant rods 20 are adjacent on the main signal transmission path. In other words, the coupling achieved by these two resonant rods 20 through the capacitive coupling structure 30 is a coupling relationship on the main signal transmission path. That is to say, the coupling relationship between these two resonant rods 20 is cascaded.

[0051] Or, such as Figure 5 As shown, when at least three resonant rods 20 are provided, the first resonant rod 20a and the second resonant rod 20b can be two non-adjacent resonant rods 20. Two non-adjacent resonant rods 20 mean that they are not adjacent on the main signal transmission path; that is, the coupling achieved by these two resonant rods 20 via the capacitive coupling structure 30 is cross-coupling, meaning that the coupling relationship between these two resonant rods 20 is non-cascaded.

[0052] It should also be noted that the number of capacitive coupling structures 30 is at least one. The capacitive coupling structure 30 is disposed between the first resonant rod 20a and the second resonant rod 20b, and enables capacitive coupling between the first resonant rod 20a and the second resonant rod 20b.

[0053] The capacitive coupling structure 30 includes a first coupling member 31 and a second coupling member 32. The first coupling member 31 is connected and fixed to the first plate 11 and grounded. The first coupling member 31 and the first plate 11 can be integrally connected or separately connected. The separate connection method can be, but is not limited to, welding, crimping, plugging, threaded connection, snap-fit, and bonding. The second coupling member 32 is connected and fixed to the second plate 12 and grounded. The second coupling member 32 and the second plate 12 can be integrally connected or separately connected. The separate connection method can be, but is not limited to, welding, crimping, plugging, threaded connection, snap-fit, and bonding. The first coupling member 31 extends from the first plate 11 toward the second plate 12, and the second coupling member 32 extends from the second plate 12 toward the first plate 11, that is, the first coupling member 31 and the second coupling member 32 extend toward each other. The ends of the first coupling member 31 and the second coupling member 32 facing each other abut against each other, that is, the end of the first coupling member 31 away from the first plate 11 abuts against the end of the second coupling member 32 away from the second plate 12.

[0054] Based on the connection between the first coupling member 31 and the first plate 11, the connection between the second coupling member 32 and the second plate 12, and the contact between the first coupling member 31 and the second coupling member 32, the capacitive coupling structure 30 is grounded between the first plate 11 and the second plate 12, meaning both ends of the capacitive coupling structure 30 are grounded. This allows the capacitive coupling structure 30 to enable the first resonant rod 20a and the second resonant rod 20b to form a capacitive coupling, rather than an inductive coupling.

[0055] In summary, the filter provided in this application embodiment can provide a capacitive coupling structure 30 between the first resonant rod 20a and the second resonant rod 20b, thereby enabling capacitive coupling between the first resonant rod 20a and the second resonant rod 20b. Specifically, the capacitive coupling structure 30 can be connected and fixed to the first plate 11 via a first coupling member 31 and grounded via a second coupling member 32. The first coupling member 31 and the second coupling member 32 can extend towards each other and abut against each other, allowing the entire capacitive coupling structure 30 to be grounded between the first plate 11 and the second plate 12. This ensures that both ends of the capacitive coupling structure 30 are grounded, thereby enabling the capacitive coupling structure 30 to reliably and stably achieve capacitive coupling rather than inductive coupling between the first resonant rod 20a and the second resonant rod 20b. Based on this, the capacitive coupling structure 30 can achieve capacitive coupling between the first resonant rod 20a and the second resonant rod 20b using only the first coupling member 31 and the second coupling member 32. Compared with the capacitive coupling structure of existing filters, at least the insulating bracket, fastening screws, and fastening nuts can be omitted. Therefore, the capacitive coupling structure 30 of this embodiment can simplify and optimize the structure, reduce the number of parts and assembly materials, simplify and optimize the assembly process, thereby simplifying the filter structure, facilitating the miniaturization, simplification, and lightweighting of the filter, and improving the integration, consistency, and reliability of the filter. It can also simplify the filter assembly process, improve the assembly convenience and efficiency of the filter, facilitate the mass production of the filter, and reduce the material and production costs of the filter. Furthermore, it can facilitate the filter to build a stable and reliable capacitive coupling relationship as needed through the capacitive coupling structure 30, and maintain and optimize the filter's filtering performance and frequency selectivity characteristics.

[0056] Furthermore, the capacitive coupling structure 30 in this embodiment has better structural versatility and a wider range of applications, making it suitable for numerous scenarios. Unlike existing filters, it does not require the replacement of different types of fly rods (such as dumbbell-shaped fly rods, plate-shaped fly rods, etc.) according to different needs.

[0057] Furthermore, due to internal space and structural limitations, miniaturized filters would find it difficult to achieve capacitive coupling using existing filter capacitive coupling structures. However, the capacitive coupling structure 30 in this embodiment requires less space between the first resonant rod 20a and the second resonant rod 20b, and requires very few additional components for installation and assembly, making it particularly suitable for the needs of miniaturized filters.

[0058] like Figure 1 , Figure 3 , Figure 5As shown, in some embodiments, the filter includes a coupling adjustment structure 60, which is separately connected to the second plate 12 and disposed between the first resonant rod 20a and the second resonant rod 20b. When the first resonant rod 20a and the second resonant rod 20b are adjacent resonant rods 20, the coupling adjustment structure 60 is used to adjust the coupling strength between the first resonant rod 20a and the second resonant rod 20b; when the first resonant rod 20a and the second resonant rod 20b are not adjacent resonant rods 20, the coupling adjustment structure 60 is used to adjust the zero-point strength and to tune the passband out-of-band rejection.

[0059] Please see Figure 3 In some embodiments of this application, the first coupling member 31 is integrally connected to the first plate member 11.

[0060] It should be noted that the first coupling member 31 is integrally formed with the first plate 11, so that the first coupling member 31 is integrally connected to the first plate 11. The integral forming method can be, but is not limited to, powder metallurgy forming. In this case, the material of the first coupling member 31 is the same as the material of the first plate 11, and the whole formed by the first coupling member 31 and the first plate 11 can be a metal part (for example, it can be made of stainless steel, iron, etc.), or it can be coated with a metal layer (the part used to support the metal layer can be made of non-metallic material).

[0061] By adopting the above-mentioned solution, and by integrally connecting and molding the first coupling member 31 with the first plate 11, the processing and molding of the first coupling member 31 can be facilitated, thereby improving the processing convenience and consistency of the first coupling member 31, and enhancing its structural strength, structural reliability, operational reliability, and service life. Furthermore, the connecting parts between the first coupling member 31 and the first plate 11 can be omitted, thus simplifying the filter structure, promoting filter simplification and weight reduction, and improving filter integration. Finally, the assembly process between the first coupling member 31 and the first plate 11 can be simplified, thereby simplifying the filter assembly process, improving assembly convenience and efficiency, and facilitating mass production of the filter. On the one hand, it can improve the accuracy of the shape and size of the first coupling member 31, improve the positional accuracy and state stability of the first coupling member 31 relative to the first plate 11, and enable the first coupling member 31 to accurately align and abut against the second coupling member 32 in the assembly process of the filter housing 10 itself, so that the first coupling member 31 and the second coupling member 32 can form a reliable and effective capacitive coupling structure 30, thereby improving the accuracy, consistency and reliability of the capacitive coupling structure 30, improving the consistency, quality and yield of the filter, and reducing the defect rate and debugging cost of the filter.

[0062] Please see Figure 3In some embodiments of this application, the second coupling member 32 is integrally connected to the second plate member 12.

[0063] It should be noted that the second coupling member 32 is integrally formed with the second plate 12, so that the second coupling member 32 is integrally connected to the second plate 12. The integral forming method can be, but is not limited to, die casting and powder metallurgy forming. In this case, the material of the second coupling member 32 is the same as the material of the second plate 12, and the whole formed by the second coupling member 32 and the second plate 12 can be a metal part (for example, it can be made of aluminum), or it can be coated with a metal layer (the part used to support the metal layer can be made of non-metallic material).

[0064] By adopting the above-described scheme, and by integrally connecting and molding the second coupling member 32 with the second plate 12, the processing and molding of the second coupling member 32 can be facilitated, thereby improving the processing convenience and consistency of the second coupling member 32, and enhancing its structural strength, structural reliability, operational reliability, and service life. Furthermore, the connecting parts between the second coupling member 32 and the second plate 12 can be omitted, thus simplifying the filter structure, promoting filter simplification and weight reduction, and improving filter integration. Finally, the assembly process between the second coupling member 32 and the second plate 12 can be simplified, thereby simplifying the filter assembly process, improving assembly convenience and efficiency, and facilitating mass production of the filter. On the one hand, it can improve the accuracy of the shape and size of the second coupling member 32, improve the positional accuracy and state stability of the second coupling member 32 relative to the second plate 12, and enable the second coupling member 32 to accurately align and abut against the first coupling member 31 in the assembly process of the filter housing 10 itself, so that the first coupling member 31 and the second coupling member 32 can form a reliable and effective capacitive coupling structure 30, thereby improving the accuracy, consistency and reliability of the capacitive coupling structure 30, improving the consistency, quality and yield of the filter, and reducing the defect rate and debugging cost of the filter.

[0065] This embodiment is particularly suitable for use in conjunction with the previous embodiment. With this configuration, the first coupling member 31 is integrally formed with the first plate 11, and the second coupling member 32 is integrally formed with the second plate 12. During the multi-part assembly of the filter housing 10, the first coupling member 31 and the second coupling member 32 can simultaneously achieve mutual alignment and contact. Based on this, not only can the assembly process between the first coupling member 31 and the first plate 11 and the assembly process between the second coupling member 32 and the second plate 12 be simplified, but the assembly process of aligning and contacting the first coupling member 31 and the second coupling member 32 can be combined with the multi-part assembly process of the filter housing 10. This effectively simplifies the filter's processing and assembly processes, improves the ease and efficiency of filter assembly, and facilitates mass production of the filter.

[0066] Of course, either the embodiment of "the second coupling member 32 is integrally connected to the second plate 12" or the embodiment of "the first coupling member 31 is integrally connected to the first plate 11" can be selected.

[0067] Please see Figure 3 In some embodiments of this application, the first coupling member 31 is arranged near the first resonant rod 20a and away from the second resonant rod 20b, and the second coupling member 32 is arranged near the second resonant rod 20b and away from the first resonant rod 20a.

[0068] It should be noted that the first coupling element 31 is arranged relatively close to the first resonant rod 20a and relatively far away from the second resonant rod 20b, that is, as shown in the figure. Figure 3 As shown, in some embodiments, the first coupling member 31 may abut against the first resonant rod 20a and be spaced apart from the second resonant rod 20b; in other embodiments, the first coupling member 31 may be spaced apart from the first resonant rod 20a and the second resonant rod 20b, and the spacing between the first coupling member 31 and the first resonant rod 20a is smaller than the spacing between the first coupling member 31 and the second resonant rod 20b.

[0069] The second coupling element 32 is arranged near the second resonant rod 20b and away from the first resonant rod 20a, that is, as Figure 3 As shown, in some embodiments, the second coupling member 32 may be spaced apart from the second resonant rod 20b and from the first resonant rod 20a, and the spacing between the second coupling member 32 and the second resonant rod 20b is smaller than the spacing between the second coupling member 32 and the first resonant rod 20a; in other embodiments, the second coupling member 32 may abut against the second resonant rod 20b and be spaced apart from the first resonant rod 20a.

[0070] By adopting the above scheme, when the capacitive coupling structure 30 is disposed between the first resonant rod 20a and the second resonant rod 20b, by arranging the first coupling member 31 relatively close to the first resonant rod 20a and relatively far away from the second resonant rod 20b, and by arranging the second coupling member 32 relatively close to the second resonant rod 20b and relatively far away from the first resonant rod 20a, the capacitive coupling structure 30 can be arranged in a relatively wide Z-shape between the first resonant rod 20a and the second resonant rod 20b. Based on this, the relatively wide Z-shaped capacitive coupling structure 30 can enhance coupling by being close to the first resonant rod 20a via the first coupling member 31, reliably capacitively coupled by being sufficiently spaced between the first coupling member 31 and the second resonant rod 20b, enhanced coupling by being close to the second resonant rod 20b via the second coupling member 32, and reliably capacitively coupled by being sufficiently spaced between the second coupling member 32 and the first resonant rod 20a. This optimizes the structure and shape of the capacitive coupling structure 30, optimizes the layout of the first coupling member 31 and the second coupling member 32, enables stable and reliable capacitive coupling between the first resonant rod 20a and the second resonant rod 20b via the capacitive coupling structure 30, and optimizes the effect of capacitive coupling between the first resonant rod 20a and the second resonant rod 20b via the capacitive coupling structure 30. This optimizes the frequency selectivity and filtering performance of the filter.

[0071] Furthermore, based on the configuration of this embodiment, the formation of a "coupling rib structure" can be largely avoided by the first coupling member 31 simultaneously abutting against the first resonant rod 20a and the second resonant rod 20b, and the formation of a "coupling rib structure" can be largely avoided by the second coupling member 32 simultaneously abutting against the first resonant rod 20a and the second resonant rod 20b, and the formation of a "wall structure" can be largely avoided by the capacitive coupling structure 30 simultaneously abutting against the first plate 11 and the second plate 12, as well as simultaneously abutting against the first resonant rod 20a and the second resonant rod 20b. This is beneficial for maintaining the coupling effect of the capacitive coupling structure 30, and can enable the first resonant rod 20a and the second resonant rod 20b to reliably achieve capacitive coupling (rather than inductive coupling) through the capacitive coupling structure 30, thereby improving the reliability and consistency of the capacitive coupling structure 30.

[0072] Of course, in other embodiments, the capacitive coupling structure 30 can be arranged relatively close to the first resonant rod 20a and relatively far away from the second resonant rod 20b, that is, both the first coupling member 31 and the second coupling member 32 are arranged relatively close to the first resonant rod 20a and relatively far away from the second resonant rod 20b. Alternatively, the capacitive coupling structure 30 can be arranged relatively close to the second resonant rod 20b and relatively far away from the first resonant rod 20a, that is, both the first coupling member 31 and the second coupling member 32 are arranged relatively close to the second resonant rod 20b and relatively far away from the first resonant rod 20a.

[0073] Please see Figure 3In some embodiments of this application, the first coupling member 31 abuts against the outer peripheral wall of the first resonant rod 20a and is spaced apart from the outer peripheral wall of the second resonant rod 20b.

[0074] By adopting the above scheme, by having the first coupling element 31 abut against the outer peripheral wall of the first resonant rod 20a, a direct physical connection can be formed between the first coupling element 31 and the first resonant rod 20a, thereby strengthening the coupling between the first coupling element 31 and the first resonant rod 20a, promoting tight and efficient coupling, and enhancing the energy transfer efficiency between the first resonant rod 20a and the capacitive coupling structure 30. By having the first coupling element 31 spaced from the outer peripheral wall of the second resonant rod 20b, the first coupling element 31 and the second resonant rod 20b can maintain a distance while achieving capacitive coupling through the electric field, thereby maintaining the coupling polarity and capacitive coupling effect. Based on this, the capacitive coupling effect achieved between the first resonant rod 20a and the second resonant rod 20b through the capacitive coupling structure 30 can be optimized, improving coupling stability and reliability, and optimizing the frequency selectivity characteristics and filtering performance of the filter.

[0075] Furthermore, since the first coupling member 31 abuts against the outer peripheral wall of the first resonant rod 20a, there is no gap between the first coupling member 31 and the first resonant rod 20a. This facilitates the processing and forming of the first coupling member 31 and the positioning and matching between the first coupling member 31 and the first resonant rod 20a. It can reduce the precision requirements and errors during the processing and assembly of the first coupling member 31, reduce the processing difficulty, assembly difficulty and cost, and improve the processing accuracy. In this way, it can improve the accuracy, consistency and reliability of the capacitive coupling structure 30, improve the consistency, quality and yield of the filter, and reduce the defect rate of the filter.

[0076] Please see Figure 3 In some embodiments of this application, the first coupling member 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 are an integrated structure.

[0077] It should be noted that the first coupling element 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 are an integrated structure, meaning they are integrally formed, so that the first coupling element 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 are each integrally connected to the first plate 11. The integral forming method can be, but is not limited to, powder metallurgy forming. In this case, the first coupling element 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 are made of the same material, and are entirely metal (e.g., stainless steel, iron, etc.), or have a surface coated with a metal layer (the part supporting the metal layer can be made of non-metallic materials).

[0078] By adopting the above solution, and by making the first coupling element 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 an integrated structure, on the one hand, it is easier to process and form the first coupling element 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 together, thereby improving processing convenience, processing efficiency, processing accuracy, structural consistency, and structural reliability; on the other hand, the connecting parts between the first coupling element 31 and the first plate 11, between the first resonant rod 20a and the first plate 11, and between the second resonant rod 20b and the first plate 11 can be omitted, from This simplifies the filter's structure, making it more streamlined and lightweight, and improving its integration. On one hand, it simplifies the positioning and assembly processes between the first coupling element 31 and the first plate 11, between the first resonant rod 20a and the first plate 11, between the second resonant rod 20b and the first plate 11, between the first coupling element 31 and the first resonant rod 20a, and between the first coupling element 31 and the second resonant rod 20b. Furthermore, after the integral molding process, no secondary processing is needed to form the gap between the first coupling element 31 and the second plate 12, thus simplifying the filter's integration. The manufacturing and assembly processes can improve the convenience, efficiency, and accuracy of filter production, facilitating mass production. On the one hand, they can improve the accuracy of parameters (such as shape and size) of the first coupling element 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11, thereby improving the positional accuracy between the first coupling element 31 and the first plate 11, between the first resonant rod 20a and the first plate 11, between the second resonant rod 20b and the first plate 11, between the first coupling element 31 and the first resonant rod 20a, and between the first coupling element 31 and the second resonant rod 20b. The degree and state stability can be improved by ensuring that the first coupling member 31 can be precisely aligned and abut against the second coupling member 32 during the assembly process of the filter housing 10. This allows the first coupling member 31 and the second coupling member 32 to form a reliable and effective capacitive coupling structure 30. The capacitive coupling structure 30 is precisely located between the first resonant rod 20a and the second resonant rod 20b, which can accurately achieve the required capacitive coupling between the first resonant rod 20a and the second resonant rod 20b. This improves the accuracy, consistency, and reliability of the capacitive coupling structure 30, and enhances the consistency, quality, and yield of the filter.

[0079] This embodiment is particularly suitable for use in conjunction with the previous embodiment. When the first coupling member 31 abuts against the outer peripheral wall of the first resonant rod 20a, there is no gap between the first coupling member 31 and the first resonant rod 20a. If the first coupling member 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 are integrally formed, then the first coupling member 31 is integrally connected to both the plate surface of the first plate 11 and the outer peripheral wall of the first resonant rod 20a. Based on this, compared to the solution where "the first coupling element 31, the first resonant rod 20a, the second resonant rod 20b, and the first plate 11 are integrally formed, but a gap is left between the first coupling element 31 and the first resonant rod 20a", the solution where "the first coupling element 31 is integrally connected to the plate surface of the first plate 11 and also integrally connected to the outer peripheral wall of the first resonant rod 20a" is more convenient to form and process, and can improve processing accuracy and structural strength. It can also reduce the risk of poor electrical performance caused by the gap between the first coupling element 31 and the first resonant rod 20a, thereby improving the consistency, quality, and yield of the filter and reducing the defect rate of the filter.

[0080] Of course, in other embodiments, some of the "first coupling member 31, first resonant rod 20a, second resonant rod 20b and first plate 11" may be an integrated structure, while other parts may be assembled separately; or all of the "first coupling member 31, first resonant rod 20a, second resonant rod 20b and first plate 11" may be assembled separately; the other resonant rods 20 except for the first resonant rod 20a and the second resonant rod 20b may be integrally connected to the first plate 11 or separately connected to the first plate 11.

[0081] Please see Figure 3 , Figure 5 In some embodiments of this application, the first coupling member 31, each resonant rod 20 and the first plate 11 are an integrated structure.

[0082] It should be noted that the first coupling element 31, all resonant rods 20, and the first plate 11 are an integrated structure, meaning that the first coupling element 31, each resonant rod 20, and the first plate 11 are integrally formed, so that the first coupling element 31 and each resonant rod 20 are integrally connected to the first plate 11. The integral forming method can be, but is not limited to, powder metallurgy forming. In this case, the first coupling element 31, each resonant rod 20, and the first plate 11 are made of the same material, and the whole is a metal part (for example, it can be made of stainless steel, iron, etc.), or the surface is coated with a metal layer (the part used to support the metal layer can be made of non-metallic materials).

[0083] By adopting the above scheme, and by making the first coupling element 31, each resonant rod 20, and the first plate 11 an integrated structure, on the one hand, it is easier to process the first coupling element 31, each resonant rod 20, and the first plate 11 together, thereby improving processing convenience, processing accuracy, structural consistency, and structural reliability; on the other hand, it can eliminate the connecting parts between the first coupling element 31 and the first plate 11, and between each resonant rod 20 and the first plate 11, thereby simplifying the filter structure, facilitating filter simplification and weight reduction, and improving filter integration; furthermore, it can improve the accuracy of the parameters (such as shape and size) of the first coupling element 31, each resonant rod 20, and the first plate 11, and improve the positional accuracy and state stability between the first coupling element 31 and the first plate 11, between each resonant rod 20 and the first plate 11, and between the first coupling element 31 and each resonant rod 20, thereby improving the filter's consistency, quality, and yield.

[0084] Furthermore, the positioning and assembly processes between the first coupling member 31 and the first plate 11, between each resonant rod 20 and the first plate 11, and between the first coupling member 31 and each resonant rod 20 can be simplified. In particular, when the filter housing 10 is assembled with multiple parts closed, the resonant rods 20 can be arranged inside the filter, and the first coupling member 31 and the second coupling member 32 can be aligned and abutted to form a capacitive coupling structure 30. At the same time, the capacitive coupling structure 30 is precisely located between the first resonant rod 20a and the second resonant rod 20b, so that the first resonant rod 20a and the second resonant rod 20b are capacitively coupled. This can greatly reduce the need to add other materials inside the filter, greatly reduce the filter assembly materials, and greatly simplify the filter assembly process. The filter can be produced and assembled quickly, simply, and conveniently with very few steps, thereby improving the production convenience and efficiency of the filter and facilitating the mass production of the filter.

[0085] Please see Figure 3 , Figure 5 In some embodiments of this application, at least one resonant rod 20 is provided with an annular structure 40 on its outer periphery. The annular structure 40 is connected to the second plate 12, and the inner ring wall of the annular structure 40 is spaced apart from the outer peripheral wall of the corresponding resonant rod 20.

[0086] It should be noted that the annular structure 40 is connected to the side of the second plate 12 facing the first plate 11. The annular structure 40 and the second plate 12 can be integrally connected or separately connected. Separate connection methods can include, but are not limited to, welding, pressing, plugging, threaded connection, snap-fit, and bonding. The annular structure 40 can be a closed ring or an open ring. The annular structure 40 can be a circular ring, a rectangular ring, or other ring shapes.

[0087] At least one resonant rod 20 is fitted with an annular structure 40 around its outer periphery. That is, each resonant rod 20 can be fitted with an annular structure 40 around its outer periphery, so that the annular structure 40 corresponds one-to-one with the resonant rod 20, and the number of annular structures 40 is equal to the number of resonant rods 20. Alternatively, some resonant rods 20 can be fitted with an annular structure 40 around their outer periphery, while other resonant rods 20 can be left unfitted, so that the number of annular structures 40 is less than the number of resonant rods 20.

[0088] Since the electric field is concentrated near the second plate 12 and the annular structure 40 is connected to the second plate 12, the inner ring wall of the annular structure 40 and the outer peripheral wall of the corresponding resonant rod 20 (i.e., the resonant rod 20 located inside the ring of the annular structure 40) are spaced apart, a parallel plate capacitor can be formed between the inner ring wall of the annular structure 40 and the outer peripheral wall of the corresponding resonant rod 20. Based on this, the resonant rod 20 with the annular structure 40 on its outer periphery can not only form a parallel plate capacitor by being spaced apart from the second plate 12 through its end wall away from the first plate 11, but also by being spaced apart from the inner ring wall of the annular structure 40 through its outer peripheral wall.

[0089] The length of the annular structure 40 along its own axis can be set as needed. Theoretically, it is permissible to "set the annular structure 40 to be longer and the resonant rod 20 to be shorter along its axis," but this may make tuning (i.e., adjusting the resonant frequency) somewhat difficult.

[0090] By adopting the above scheme, by adding an annular structure 40 to the outer periphery of at least one resonant rod 20, and by spacing the inner ring wall of the annular structure 40 from the outer ring wall of the corresponding resonant rod 20, the resonant rod 20 with the annular structure 40 on its outer periphery can form a parallel plate capacitor not only through the end wall of the resonant rod 20 away from the first plate 11 and spaced from the second plate 12, but also through the outer ring wall of the resonant rod 20 and the inner ring wall of the annular structure 40. Based on this, the total capacitance between the resonant rod 20 and the second plate 12, and between the resonant rod 20 and the annular structure 40, can be increased, and the resonant frequency generated by the resonant rod 20 can be reduced. This allows the resonant frequency of the resonant rod 20 to meet the passband requirements of the filter, thereby optimizing the filter's filtering performance and frequency selectivity characteristics. Furthermore, the ring structure 40 can be easily added or removed as needed, and the capacitance value can be flexibly adjusted by adjusting the spacing and / or relative area between the ring structure 40 and the resonant rod 20, the size of the ring structure 40, etc. This facilitates precise control of the resonant frequency of the resonant rod 20 and optimizes the filtering performance and frequency selectivity of the filter.

[0091] Please see Figure 3In some embodiments of this application, a first annular structure 40a is sleeved on the outer periphery of the first resonant rod 20a, the first annular structure 40a is connected to the second plate 12, and the inner annular wall of the first annular structure 40a is spaced apart from the outer peripheral wall of the first resonant rod 20a; a second annular structure 40b is sleeved on the outer periphery of the second resonant rod 20b, the second annular structure 40b is connected to the second plate 12, and the inner annular wall of the second annular structure 40b is spaced apart from the outer peripheral wall of the second resonant rod 20b; the second coupling member 32 abuts against the outer annular wall of the second annular structure 40b and is spaced apart from the outer annular wall of the first annular structure 40a.

[0092] It should be noted that the outer periphery of the first resonant rod 20a is fitted with a first annular structure 40a, which is the same as the annular structure 40 in the previous embodiment. The outer periphery of the second resonant rod 20b is fitted with a second annular structure 40b, which is also the same as the annular structure 40 in the previous embodiment.

[0093] By adopting the above scheme, with the second coupling member 32 positioned near the second resonant rod 20b and away from the first resonant rod 20a, and by having the second coupling member 32 abut against the outer ring wall of the second annular structure 40b, a direct physical connection can be formed between the second coupling member 32 and the second annular structure 40b. This strengthens the coupling between the second coupling member 32 and the second resonant rod 20b, enhancing the energy transfer efficiency between the second resonant rod 20b and the capacitive coupling structure 30. Furthermore, by positioning the second coupling member 32 at a distance from the outer ring wall of the first annular structure 40a, a distance can be maintained between the second coupling member 32 and the first annular structure 40a, allowing capacitive coupling to be achieved through the electric field while maintaining this distance. This maintains the coupling polarity and capacitive coupling effect. Based on this, the capacitive coupling effect achieved between the first resonant rod 20a and the second resonant rod 20b via the capacitive coupling structure 30 can be optimized, improving coupling stability and reliability, and optimizing the frequency selectivity and filtering performance of the filter.

[0094] Furthermore, since the second coupling member 32 abuts against the outer ring wall of the second annular structure 40b, there is no gap between the second coupling member 32 and the second annular structure 40b. This facilitates the processing and forming of the second coupling member 32 and the positioning and engagement between the second coupling member 32 and the second annular structure 40b. It can reduce the precision requirements and errors during the processing and assembly of the second coupling member 32, reduce the processing difficulty, assembly difficulty and cost, and improve the processing accuracy. In this way, it can improve the accuracy, consistency and reliability of the capacitive coupling structure 30, improve the consistency, quality and yield of the filter, and reduce the defect rate of the filter.

[0095] Of course, in other embodiments, the second coupling member 32 may be spaced apart from the outer ring wall of the second annular structure 40b and from the outer ring wall of the first annular structure 40a.

[0096] Please see Figure 3 In some embodiments of this application, the second coupling member 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 are an integrated structure.

[0097] It should be noted that the second coupling element 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 are an integrated structure, meaning that the second coupling element 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 are integrally formed, so that the second coupling element 32, the first annular structure 40a, and the second annular structure 40b are integrally connected to the second plate 12. The integral forming method can be, but is not limited to, die casting and powder metallurgy forming. In this case, the second coupling element 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 are made of the same material, and are entirely metal parts (e.g., aluminum), or have a metal layer covering the surface (the part located within the metal layer can be made of non-metallic materials).

[0098] By adopting the above solution, and by making the second coupling member 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 an integrated structure, on the one hand, it is easier to process and form the second coupling member 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 together, thereby improving processing convenience, processing efficiency, processing accuracy, structural consistency, and structural reliability; on the other hand, the connecting parts between the second coupling member 32 and the second plate 12, between the first annular structure 40a and the second plate 12, and between the second annular structure 40b and the second plate 12 can be omitted, thereby simplifying the process. Simplifying the filter structure facilitates its reduction in size and weight, and improves its integration density. On one hand, it simplifies the positioning and assembly processes between the second coupling member 32 and the second plate 12, between the first ring structure 40a and the second plate 12, between the second ring structure 40b and the second plate 12, between the second coupling member 32 and the first ring structure 40a, and between the second coupling member 32 and the second ring structure 40b. Furthermore, after the integral molding process, no secondary processing is required to form the gap between the second coupling member 32 and the first plate 11, thereby simplifying the filter's manufacturing and assembly processes. This can improve the ease of production, efficiency, and accuracy of filters, facilitating mass production. On one hand, it can improve the accuracy of parameters (such as shape and size) of the second coupling element 32, the first ring structure 40a, the second ring structure 40b, and the second plate 12. It can also improve the positional accuracy and stability between the second coupling element 32 and the second plate 12, between the first ring structure 40a and the second plate 12, between the second ring structure 40b and the second plate 12, between the second coupling element 32 and the first ring structure 40a, and between the second coupling element 32 and the second ring structure 40b. This can improve the filtering... During the assembly process of the housing 10, the second coupling member 32 is precisely aligned and abuts against the first coupling member 31, thereby enabling the first coupling member 31 and the second coupling member 32 to form a reliable and effective capacitive coupling structure 30. The capacitive coupling structure 30 is precisely located between the first ring structure 40a and the second ring structure 40b, and between the first resonant rod 20a and the second resonant rod 20b. This allows the first resonant rod 20a and the second resonant rod 20b to achieve the required capacitive coupling, thereby improving the accuracy, consistency, and reliability of the capacitive coupling structure 30, and improving the consistency, quality, and yield of the filter.

[0099] This embodiment is particularly suitable for use in conjunction with the previous embodiment. When the second coupling member 32 abuts against the outer ring wall of the second annular structure 40b, there is no gap between the second coupling member 32 and the second annular structure 40b. If the second coupling member 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 are integrally formed, then the second coupling member 32 is integrally connected to both the plate surface of the second plate 12 and the outer ring wall of the second annular structure 40b. Based on this, compared to the solution where "the second coupling element 32, the first annular structure 40a, the second annular structure 40b, and the second plate 12 are integrally formed, but a gap is left between the second coupling element 32 and the second annular structure 40b", the solution where "the second coupling element 32 is integrally connected to the plate surface of the second plate 12 and also integrally connected to the outer ring wall of the second annular structure 40b" is more convenient to form and process, and can improve processing accuracy and structural strength. It can also reduce the risk of poor electrical performance caused by the gap between the second coupling element 32 and the second annular structure 40b, thereby improving the consistency, quality, and yield of the filter and reducing the defect rate of the filter.

[0100] Of course, in other embodiments, some of the "second coupling member 32, first annular structure 40a, second annular structure 40b and second plate 12" may be integrated structures, while other parts may be assembled separately; or all of the "second coupling member 32, first annular structure 40a, second annular structure 40b and second plate 12" may be assembled separately; other annular structures 40 except for the first annular structure 40a and the second annular structure 40b may be integrally connected to the second plate 12 or separately connected to the second plate 12.

[0101] Please see Figure 3 , Figure 5 In some embodiments of this application, the second coupling member 32, each annular structure 40 and the second plate 12 are an integrated structure.

[0102] It should be noted that the second coupling element 32, all annular structures 40, and the second plate 12 are an integral structure, meaning that the second coupling element 32, each annular structure 40, and the second plate 12 are integrally formed, so that the second coupling element 32 and each annular structure 40 are integrally connected to the second plate 12. The integral forming method can be, but is not limited to, die casting and powder metallurgy forming. In this case, the second coupling element 32, each annular structure 40, and the second plate 12 are made of the same material, and the whole is a metal part (e.g., aluminum), or the surface is coated with a metal layer (the part used to support the metal layer can be made of non-metallic materials).

[0103] By adopting the above scheme, and by making the second coupling element 32, each ring structure 40, and the second plate 12 an integrated structure, on the one hand, it is easier to process the second coupling element 32, each ring structure 40, and the second plate 12 together, thereby improving processing convenience, processing accuracy, structural consistency, and structural reliability; on the other hand, the connecting parts between the second coupling element 32 and the second plate 12, and between each ring structure 40 and the second plate 12, can be omitted, thereby simplifying the filter structure, facilitating filter simplification and weight reduction, and improving filter integration; furthermore, it can improve the accuracy of the parameters (such as shape and size) of the second coupling element 32, each ring structure 40, and the second plate 12, and improve the positional accuracy and state stability between the second coupling element 32 and the second plate 12, between each ring structure 40 and the second plate 12, and between the second coupling element 32 and each ring structure 40, thereby improving the filter consistency, quality, and yield.

[0104] Furthermore, the positioning and assembly processes between the second coupling member 32 and the second plate 12, between each annular structure 40 and the second plate 12, and between the second coupling member 32 and each annular structure 40 can be simplified. In particular, during the multi-part assembly of the filter housing 10, each annular structure 40 can be precisely fitted onto the outer periphery of the corresponding resonant rod 20, and the first coupling member 31 and the second coupling member 32 can be aligned and abutted to form a capacitive coupling structure 30. At the same time, the capacitive coupling structure 30 can be precisely located between the first resonant rod 20a and the second resonant rod 20b to capacitively couple the first resonant rod 20a and the second resonant rod 20b. This can greatly reduce the need to add other assembly materials inside the filter, greatly reduce the filter assembly materials, and greatly simplify the filter assembly process. The filter can be produced and assembled quickly, simply, and conveniently with very few steps, thereby improving the production convenience and efficiency of the filter and facilitating the mass production of the filter.

[0105] Furthermore, since the annular structure 40 is integrally formed with the second plate 12, the processing accuracy of the annular structure 40 can be improved, and the loosening, processing error, and fitting error of the annular structure 40 can be reduced. This is beneficial for accurately controlling the resonant frequency of the resonant rod 20 and for optimizing the filtering performance and frequency selection characteristics of the filter.

[0106] Please see Figure 3 In some embodiments of this application, the first coupling member 31 and the second coupling member 32 are welded and fixed.

[0107] It should be noted that the first coupling member 31 and the second coupling member 32 are aligned and welded together to form a capacitive coupling structure 30.

[0108] In some embodiments, the first coupling member 31 is integrally formed with the first plate 11, and the second coupling member 32 is integrally formed with the second plate 12. During the multi-part assembly of the filter housing 10, the first coupling member 31 and the second coupling member 32 simultaneously align and abut against each other. In this case, to facilitate the welding and fixing of the first coupling member 31 and the second coupling member 32, tin can be applied to the preset welding points between the first coupling member 31 and the second coupling member 32 before the multi-part assembly of the filter housing 10; then, before the solder paste cures, the multi-part assembly of the filter housing 10 is carried out, simultaneously achieving the alignment, abutment, and welding fixing of the first coupling member 31 and the second coupling member 32. This configuration simplifies assembly, enabling the alignment, abutment, and welding fixing of the first coupling member 31 and the second coupling member 32 to be completed simultaneously with the multi-part assembly of the filter housing 10, thus making it suitable for large-scale, mass production of filters.

[0109] By adopting the above scheme, and by aligning and welding the first coupling member 31 and the second coupling member 32 together, the connection strength, connection firmness, connection reliability, and connection stability between the first coupling member 31 and the second coupling member 32 can be improved. This can also improve the structural reliability and structural stability of the capacitive coupling structure 30 formed by the first coupling member 31 and the second coupling member 32. Furthermore, it can enable the capacitive coupling structure 30 to effectively resist external stresses such as vibration and impact, and reduce the risk of displacement or loosening between the first coupling member 31 and the second coupling member 32. As a result, the durability, reliability, consistency, quality, and yield of the filter can be improved.

[0110] Of course, in other embodiments, the first coupling member 31 and the second coupling member 32 may simply be aligned and abutted without welding. In this case, the first coupling member 31 and the second coupling member 32 are mainly fixed to each other via the filter housing 10.

[0111] Please see Figure 3 In some embodiments of this application, one of the first coupling member 31 and the second coupling member 32 is provided with a stop 311, and the other of the first coupling member 31 and the second coupling member 32 is positioned to abut against the stop 311.

[0112] It should be noted that, as Figure 3 As shown, in some embodiments, the first coupling member 31 has a stop 311 at one end near the second coupling member 32, and the end of the second coupling member 32 near the first coupling member 31 can be positioned to abut against the stop 311. In other embodiments, the second coupling member 32 has a stop 311 at one end near the first coupling member 31, and the end of the first coupling member 31 near the second coupling member 32 can be positioned to abut against the stop 311.

[0113] By adopting the above scheme, and by providing a stop 311 on one of the first coupling member 31 and the second coupling member 32, and positioning the other of the first coupling member 31 and the second coupling member 32 against the stop 311, the stop 311 can serve as a positioning structure, promoting precise alignment between the first coupling member 31 and the second coupling member 32. This improves the alignment accuracy and fit accuracy between the first coupling member 31 and the second coupling member 32, reduces the risk of misalignment or displacement during fit, and improves the accuracy, consistency, and reliability of the capacitive coupling structure 30. It also improves the consistency, reliability, quality, and yield of the filter. Furthermore, the stop 311 design allows for quick alignment and contact between the first coupling member 31 and the second coupling member 32, reducing repeated adjustments during assembly, improving assembly efficiency and consistency, and making it suitable for large-scale, mass production of filters.

[0114] Of course, in other embodiments, other positioning structures can be designed between the first coupling member 31 and the second coupling member 32 to achieve precise alignment, such as positioning holes and positioning shafts that are mutually positioned and inserted, etc. The positioning structure between the first coupling member 31 and the second coupling member 32 can also be omitted.

[0115] Please see Figure 3 , Figure 6 In some embodiments of this application, the outer surface of the filter housing 10 is provided with a cavity 15, which is not connected to the interior of the filter housing 10.

[0116] It should be noted that the outer surface of the filter housing 10 (e.g., the outer surface of the first plate 11, the outer surface of the second plate 12, and the outer surface of the housing body 13) is provided with a cavity 15. The number of cavities 15 is at least one. The cavity 15 can be located in a thicker area of ​​the filter housing 10, such as the area corresponding to the resonant rod 20 (e.g.,...). Figure 3 As shown), for example, the area corresponding to the first coupling member 31, the area corresponding to the second coupling member 32 (as shown) Figure 6 (as shown), etc. The cavity 15 can be a hole structure, a groove structure, etc.

[0117] Multiple cavities 15 may be interconnected or not, but each cavity 15 is not connected to the interior of the filter housing 10.

[0118] By adopting the above scheme, by providing a cavity 15 on the outer surface of the filter housing 10, the local thickness of the filter housing 10 can be reduced based on the cavity 15, thereby reducing the weight of the filter housing 10 and thus contributing to the lightweighting of the filter. Furthermore, by ensuring that the cavity 15 is not connected to the interior of the filter housing 10, on the one hand, the sealing of the inner cavity 14 of the filter housing 10 can be maintained, thus facilitating the reliable shielding function of the filter housing 10, preventing signal leakage, and maintaining the shielding performance of the filter; on the other hand, within the inner cavity 14 of the filter housing 10, the functional components with the cavity 15 (such as the resonant rod 20, the first coupling element 31, the second coupling element 32, etc.) can have complete surfaces and normally influence the distribution and transmission of electric field and current, thereby ensuring that the functional components with the cavity 15 (such as the resonant rod 20, the first coupling element 31, the second coupling element 32, etc.) can work normally and efficiently, maintaining the frequency selectivity and filtering performance of the filter.

[0119] Of course, in other embodiments, the outer surface of the filter housing 10 may not have the cavity 15.

[0120] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A filter, characterized by, The filter housing has a first plate and a second plate arranged oppositely; The resonant rods are arranged in the filter housing, connected to the first plate and spaced from the second plate, and include at least one group of first resonant rods and second resonant rods; The capacitive coupling structure is arranged between the first resonant rods and the second resonant rods and enables capacitive coupling between the first resonant rods and the second resonant rods, and includes a first coupling member and a second coupling member, the first coupling member is connected to the first plate and arranged to extend towards the second plate, the second coupling member is connected to the second plate and arranged to extend towards the first plate, and the first coupling member and the second coupling member abut each other. The first coupling member is integrally connected to the first plate.

2. The filter of claim 1, wherein, The second coupling member is integrally connected to the second plate. The first coupling member is arranged adjacent to the first resonant rods and away from the second resonant rods, and the second coupling member is arranged adjacent to the second resonant rods and away from the first resonant rods.

3. The filter of claim 1, wherein, The first coupling member abuts the outer peripheral wall of the first resonant rods and is spaced from the outer peripheral wall of the second resonant rods.

4. The filter of claim 3, wherein, The first coupling member, the first resonant rods, the second resonant rods and the first plate are an integrated structure.

5. The filter of claim 4, wherein, The outer periphery of at least one of the resonant rods is provided with an annular structure, the annular structure is connected to the second plate, and the inner annular wall of the annular structure is arranged to be spaced from the outer peripheral wall of the corresponding resonant rod.

6. The filter of claim 1, wherein, The outer periphery of the first resonant rods is provided with a first annular structure, the first annular structure is connected to the second plate, and the inner annular wall of the first annular structure is arranged to be spaced from the outer peripheral wall of the first resonant rods; 7. The filter of claim 3, wherein, The outer periphery of the second resonant rods is provided with a second annular structure, the second annular structure is connected to the second plate, and the inner annular wall of the second annular structure is arranged to be spaced from the outer peripheral wall of the second resonant rods; The second coupling member abuts the outer annular wall of the second annular structure and is spaced from the outer annular wall of the first annular structure. The second coupling member, the first annular structure, the second annular structure and the second plate are an integrated structure.

8. The filter of claim 7, wherein, The first coupling member and the second coupling member are welded and fixed.

9. The filter of any one of claims 1-8, wherein, One of the first coupling member and the second coupling member is provided with a stop, and the other of the first coupling member and the second coupling member is arranged to abut the stop; 10. The filter of any one of claims 1-8, wherein, The outer surface of the filter housing is provided with a recess, and the recess is not communicated to the interior of the filter housing. ​

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