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; 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 capacitive coupling structure is arranged between the first resonance rod and the second resonance rod and enables the first resonance rod and the second resonance rod to be capacitively coupled, the capacitive coupling structure comprises a first coupling piece and a second coupling piece which are connected to the second plate and spaced from the first plate, the first coupling piece is close to the first resonance rod and is far away from the second resonance rod, and the second coupling piece is close to the second resonance rod and is far away from the second resonance rod. The second coupling piece is close to the second resonance rod and far away from the first resonance rod, and the first coupling piece and the second coupling piece are oppositely arranged at an interval. 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] A filter is provided, including:

[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, both connected to the second plate and spaced apart from the first plate. 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. The first coupling member and the second coupling member are arranged opposite each other at intervals.

[0009] In some embodiments, the first coupling member and / or the second coupling member are integrally connected to the second plate.

[0010] In some embodiments, the filter includes a resonant engagement structure connected to the side of the second plate facing the first plate, and the resonant engagement structure is provided on the outer periphery of at least one of the resonant rods, with the resonant engagement structure spaced apart from the outer peripheral wall of the corresponding resonant rod.

[0011] In some embodiments, the outer periphery of the first resonant rod is provided with the resonant engagement structure, and the resonant engagement structure provided on the outer periphery of the first resonant rod is a first resonant engagement structure, and the first coupling member abuts against the outer wall of the first resonant engagement structure;

[0012] And / or, the outer periphery of the second resonant rod is provided with the resonant engagement structure, the resonant engagement structure provided on the outer periphery of the second resonant rod is the second resonant engagement structure, and the second coupling member abuts against the outer wall of the second resonant engagement structure.

[0013] In some embodiments, the resonant structure is a ring structure, which is sleeved on the outer periphery of the corresponding resonant rod, and the inner ring wall of the ring structure is spaced apart from the outer periphery wall of the corresponding resonant rod.

[0014] In some embodiments, the resonant mating structure is provided in a one-to-one correspondence with the resonant rod.

[0015] In some embodiments, the first coupling member, the second coupling member, each of the resonant mating structures, and the second plate are an integrated structure.

[0016] In some embodiments, the filter includes a coupling adjustment structure, which is correspondingly disposed to the capacitive coupling structure and separately connected to the second plate.

[0017] The coupling adjustment structure is located on the side of the capacitive coupling structure.

[0018] In some embodiments, each of the resonant rods and the first plate are an integrated structure.

[0019] In some embodiments, the outer surface of the filter housing is provided with a cavity, which is not connected to the interior of the filter housing.

[0020] The beneficial effects of the filter provided in this application are as follows:

[0021] The filter provided in this application embodiment can be provided with a capacitive coupling structure between a first resonant rod and a second resonant rod to achieve capacitive coupling between the first and second resonant rods. Specifically, the capacitive coupling structure can couple with and enhance the coupling of the first resonant rod through a first coupling member connected to the second plate, spaced apart from the first plate, and arranged relatively adjacent to the first resonant rod; it can also couple with and enhance the coupling of the second resonant rod through a second coupling member connected to the second plate, spaced apart from the first plate, and arranged relatively adjacent to the second resonant rod; or it can capacitively couple by positioning the first and second coupling members relative to each other at a certain distance. Based on this, the capacitive coupling structure can reliably and stably achieve capacitive coupling between the first and second resonant rods, rather than inductive coupling. Therefore, 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. Thus, the capacitive coupling structure of this embodiment simplifies and optimizes the structure, reduces the number of parts and assembly materials, simplifies and optimizes the assembly process, thereby simplifying the filter structure, facilitating the miniaturization, simplification, and lightweighting of the filter, and improving the filter's integration, consistency, and reliability. It also simplifies the filter assembly process, improves the ease and efficiency of filter assembly, facilitates mass production of the filter, and helps reduce the filter's material and production costs. Furthermore, it allows the filter to construct a stable and reliable capacitive coupling relationship as needed through the capacitive coupling structure. By changing the spacing and / or coupling area between the first coupling element and the second coupling element, the coupling strength and coupling effect achieved by the capacitive coupling structure can be adjusted, thereby maintaining and optimizing the filter's filtering performance and frequency selectivity characteristics. Attached Figure Description

[0022] 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.

[0023] Figure 1 A three-dimensional schematic diagram of a filter provided in some embodiments of this application;

[0024] Figure 2 for Figure 1 A top view of the provided filter;

[0025] Figure 3 for Figure 2 The provided sectional view along AA;

[0026] Figure 4 for Figure 1 The provided breakdown view of the filter;

[0027] Figure 5 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.

[0028] The following are the labeling elements in the figure:

[0029] 10-Filter housing, 11-First plate, 12-Second plate, 13-Housing body, 14-Inner cavity, 15-Concave cavity, 20-Resonant rod, 20a-First resonant rod, 20b-Second resonant rod, 30-Capacitive coupling structure, 31-First coupling element, 32-Second coupling element, 40-Resonant mating structure, 40a-First resonant mating structure, 40b-Second resonant mating structure, 50-Coupling adjustment structure. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The embodiments provided in this application will solve the above problems.

[0036] To illustrate the technical solutions provided in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0037] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 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, disposed between the first resonant rods 20a and second resonant rods 20b, and capacitively coupling the first resonant rods 20a and second resonant rods 20b. The capacitive coupling structure 30 includes a first coupling member 31 and a second coupling member 32, both connected to the second plate 12 and spaced apart from the first plate 11. The first coupling member 31 is arranged adjacent to the first resonant rod 20a and away from the second resonant rod 20b, and the second coupling member 32 is arranged adjacent to the second resonant rod 20b and away from the first resonant rod 20a. The first coupling member 31 and the second coupling member 32 are disposed opposite to each other at intervals.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In addition, the shape, size, material, etc. of the filter housing 10 can be flexibly set as needed.

[0042] It should also be noted that at least two resonant rods 20 are provided. Each resonant rod 20 is housed within the filter housing 10. The resonant rods 20 can be located in the same column or in different columns. The resonant rods 20 can be coupled to each other through, but not limited to, capacitive coupling structures 30, coupling ribs, coupling windows, 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.

[0043] 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, etc.).

[0044] 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, forming a parallel plate capacitor therebetween.

[0045] 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.

[0046] 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.

[0047] Among them, such as Figure 3 , Figure 4 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.

[0048] Alternatively, when there are at least three resonant rods 20, 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 the capacitive coupling structure 30 between these two resonant rods 20 is cross-coupling, meaning that the coupling relationship between these two resonant rods 20 is non-cascaded.

[0049] 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.

[0050] The capacitive coupling structure 30 includes a first coupling member 31 and a second coupling member 32. The first coupling member 31 may be entirely made of metal, or its surface may be coated with a metal layer (the part used to support the metal layer may be made of a non-metallic material). The second coupling member 32 may be entirely made of metal, or its surface may be coated with a metal layer (the part used to support the metal layer may be made of a non-metallic material).

[0051] Since the electric field is concentrated near the second plate 12, both the first coupling member 31 and the second coupling member 32 are connected and fixed to the side of the second plate 12 facing the first plate 11, so as to facilitate the coupling and transmission of the electric field by the capacitive coupling structure 30. This allows the capacitive coupling structure 30 to facilitate capacitive coupling rather than inductive coupling between the first resonant rod 20a and the second resonant rod 20b. The first coupling member 31 and the second plate 12 can be integrally connected or separately connected. Separate connection methods include, but are not limited to, welding, pressing, plugging, threaded connection, snap-fit, and bonding. Similarly, the second coupling member 32 and the second plate 12 can be integrally connected or separately connected. Separate connection methods include, but are not limited to, welding, pressing, plugging, threaded connection, snap-fit, and bonding.

[0052] The first coupling member 31 extends from the second plate 12 toward the first plate 11, and is spaced apart from the first plate 11 (i.e., the first coupling member 31 does not extend to abut against the first plate 11), so as to substantially avoid the first coupling member 31 simultaneously abutting against the first plate 11 and the second plate 12 to form a "wall structure". The second coupling member 32 extends from the second plate 12 toward the first plate 11, and is spaced apart from the first plate 11 (i.e., the second coupling member 32 does not extend to abut against the first plate 11), so as to substantially avoid the second coupling member 32 simultaneously abutting against the first plate 11 and the second plate 12 to form a "wall structure". The extension length of the first coupling member 31 and the extension length of the second coupling member 32 can be set as needed. The extension length of the first coupling member 31 can be equal to the extension length of the second coupling member 32, or the extension length of the first coupling member 31 can be different from the extension length of the second coupling member 32.

[0053] With the first coupling member 31 positioned between the first resonant rod 20a and the second resonant rod 20b, the first coupling member 31 is arranged relatively close to the first resonant rod 20a and relatively far away from the second resonant rod 20b, so that the first coupling member 31 is close to the first resonant rod 20a to enhance coupling. That is, as Figure 3 , Figure 4 As shown, in some 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. In other embodiments, the first coupling member 31 may abut against the first resonant rod 20a and be spaced apart from the second resonant rod 20b.

[0054] With the second coupling member 32 positioned between the first resonant rod 20a and the second resonant rod 20b, the second coupling member 32 is arranged relatively close to the second resonant rod 20b and relatively far away from the first resonant rod 20a, so that the second coupling member 32 is close to the second resonant rod 20b to enhance coupling. That is, as Figure 3 , Figure 4 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.

[0055] The first coupling member 31 and the second coupling member 32 are arranged at a distance from each other and coupled, so that the first coupling member 31 and the second coupling member 32 can jointly promote the capacitive coupling of the first resonant rod 20a and the second resonant rod 20b. The distance between the first coupling member 31 and the second coupling member 32 can be set as needed.

[0056] By changing the spacing and / or coupling area between the first coupling member 31 and the second coupling member 32, the coupling strength and coupling effect of the capacitive coupling achieved by the capacitive coupling structure 30 can be adjusted. Specifically, the coupling area between the first coupling member 31 and the second coupling member 32 can be changed by, but is not limited to, changing the extension length of the first coupling member 31 and the extension length of the second coupling member 32.

[0057] 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 via the capacitive coupling structure 30. Specifically, the capacitive coupling structure 30 can couple with and enhance coupling to the first resonant rod 20a via a first coupling member 31 connected to the second plate 12, spaced apart from the first plate 11, and arranged relatively adjacent to the first resonant rod 20a; it can also couple with and enhance coupling to the second resonant rod 20b via a second coupling member 32 connected to the second plate 12, spaced apart from the first plate 11, and arranged relatively adjacent to the second resonant rod 20b; or it can capacitively couple by having the first coupling member 31 and the second coupling member 32 spaced apart from each other, thus achieving capacitive coupling. Based on this, the capacitive coupling structure 30 can reliably and stably enable capacitive coupling rather than inductive coupling between the first resonant rod 20a and the second resonant rod 20b. Therefore, 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. Thus, the capacitive coupling structure 30 of this embodiment simplifies and optimizes the structure, reduces the number of parts and assembly materials, simplifies and optimizes the assembly process, thereby simplifying the filter structure, facilitating the miniaturization, simplification, and weight reduction of the filter, and improving the integration of the filter. It improves the degree of uniformity, consistency, and reliability of filters; it simplifies the filter assembly process, improves the convenience and efficiency of filter assembly, facilitates mass production of filters, and helps reduce the material and production costs of filters; it facilitates the construction of stable and reliable capacitive coupling relationships of filters as needed through the capacitive coupling structure 30, and facilitates the adjustment of the coupling strength and coupling effect of capacitive coupling achieved by the capacitive coupling structure 30 by changing the spacing and / or coupling area between the first coupling element 31 and the second coupling element 32, thereby maintaining and optimizing the filter's filtering performance and frequency selectivity characteristics.

[0058] 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.

[0059] 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.

[0060] Please see Figure 3 , Figure 4 In some embodiments of this application, the first coupling member 31 is integrally connected to the second plate member 12.

[0061] It should be noted that the first coupling member 31 and the second plate 12 are integrally formed, so that the first coupling member 31 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 first coupling member 31 is the same as the material of the second plate 12, and the whole formed by the first coupling member 31 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).

[0062] By adopting the above-mentioned solution, and by integrally connecting and molding the first coupling member 31 and the second plate 12, the processing and molding of the first coupling member 31 can be facilitated, thereby improving the processing convenience, processing accuracy, and consistency of the first coupling member 31, and improving the structural strength, structural reliability, operational reliability, and service life of the first coupling member 31. Furthermore, the connecting parts between the first coupling member 31 and the second plate 12 can be omitted, thereby simplifying the filter structure, facilitating filter simplification and weight reduction, and improving filter integration. Finally, the assembly process between the first coupling member 31 and the second plate 12 can be simplified, thereby simplifying the filter assembly process, improving the assembly convenience and efficiency of the filter, and facilitating mass production of the filter. On the one hand, it can improve the accuracy of the shape, extension length and other dimensions of the first coupling element 31, and improve the positional accuracy and state stability of the first coupling element 31 relative to the second plate 12, the second coupling element 32, the first resonant rod 20a, the second resonant rod 20b and other components. This is conducive to accurately controlling the "spacing and coupling area between the first coupling element 31 and the second coupling element 32" to meet the design requirements. It is also conducive to accurately controlling the coupling strength and coupling effect of the capacitive coupling achieved by the capacitive coupling structure 30. It can improve the accuracy, consistency and reliability of the capacitive coupling structure 30, maintain and optimize the filtering performance and frequency selection characteristics of the filter, improve the consistency, quality and yield of the filter, and reduce the defect rate and debugging cost of the filter.

[0063] Please see Figure 3 , Figure 4 In some embodiments of this application, the second coupling member 32 is integrally connected to the second plate member 12.

[0064] 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).

[0065] By adopting the above-mentioned solution, 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, processing accuracy, and consistency of the second coupling member 32, and improving the structural strength, structural reliability, operational reliability, and service life of the second coupling member 32. Furthermore, the connecting parts between the second coupling member 32 and the second plate 12 can be omitted, thereby simplifying the filter structure, facilitating 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 the assembly convenience and efficiency of the filter, and facilitating mass production of the filter. On the one hand, it can improve the accuracy of the shape, extension length and other dimensions of the second coupling member 32, and improve the positional accuracy and state stability of the second coupling member 32 relative to the second plate 12, the first coupling member 31, the first resonant rod 20a, the second resonant rod 20b and other components. This is conducive to accurately controlling the "spacing and coupling area between the first coupling member 31 and the second coupling member 32" to meet the design requirements. It is also conducive to accurately controlling the coupling strength and coupling effect of the capacitive coupling achieved by the capacitive coupling structure 30. It can improve the accuracy, consistency and reliability of the capacitive coupling structure 30, maintain and optimize the filtering performance and frequency selection characteristics of the filter, improve the consistency, quality and yield of the filter, and reduce the defect rate and debugging cost of the filter.

[0066] This embodiment is particularly suitable for use in conjunction with the previous embodiment. With this configuration, both the first coupling member 31 and the second coupling member 32 are integrally formed with the second plate 12. During forming, the first coupling member 31 and the second coupling member 32 are positioned relative to each other at intervals. This facilitates controllable and reliable assurance of the accuracy of the "spacing and coupling area between the first coupling member 31 and the second coupling member 32," and also facilitates controllable and reliable assurance of the accuracy of the "coupling strength and coupling effect of the capacitive coupling achieved by the capacitive coupling structure 30." This improves the accuracy, consistency, and reliability of the capacitive coupling structure 30, enhances the consistency, quality, and yield of the filter, and reduces the filter's defect rate and debugging costs. Furthermore, it simplifies the "assembly process between the first coupling member 31 and the second plate 12" and the "assembly process between the second coupling member 32 and the second plate 12," effectively simplifying the filter's processing and assembly processes, improving assembly convenience and efficiency, and facilitating mass production of the filter. Furthermore, due to internal space and structural limitations, the space between the first resonant rod 20a and the second resonant rod 20b is relatively small in miniaturized filters. The assembly operations of "precisely positioning and separately connecting the first coupling member 31 to the second plate 12" and "precisely positioning and separately connecting the second coupling member 32 to the second plate 12" are quite difficult. Therefore, the design of "both the first coupling member 31 and the second coupling member 32 are integrally formed with the second plate 12" is particularly suitable for the needs of miniaturized filters.

[0067] 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.

[0068] In some cases, if the resonant rod 20 forms a parallel-plate capacitor only through its end wall near the second plate 12, the resonant rod 20 may have a small capacitance value, resulting in an excessively high resonant frequency. This could cause the resonant frequency of the resonant rod 20 to fail to meet the passband requirements of the filter. For a solution to this problem, please refer to [link to relevant documentation]. Figure 3 , Figure 4 In some embodiments of this application, the filter includes a resonant engagement structure 40, which is connected to the side of the second plate 12 facing the first plate 11. The outer periphery of at least one resonant rod 20 is provided with the resonant engagement structure 40, and the resonant engagement structure 40 is spaced apart from the outer periphery wall of the corresponding resonant rod 20.

[0069] It should be noted that the resonant mating structure 40 is connected to the side of the second plate 12 facing the first plate 11. The resonant mating structure 40 and the second plate 12 can be integrally connected or separately connected. The separate connection method can be, but is not limited to, welding, pressing, plugging, threaded connection, snap-fit, and bonding.

[0070] At least one resonant rod 20 has a resonant engagement structure 40 on its outer periphery. That is, each resonant rod 20 may have a resonant engagement structure 40 on its outer periphery, such that the resonant engagement structure 40 corresponds one-to-one with the resonant rod 20, and the number of resonant engagement structures 40 is equal to the number of resonant rods 20. Alternatively, some resonant rods 20 may have a resonant engagement structure 40 on their outer periphery while others may not, such that the number of resonant engagement structures 40 is less than the number of resonant rods 20.

[0071] Since the electric field is concentrated near the second plate 12 and the resonant engagement structure 40 is connected to the second plate 12, and the resonant engagement structure 40 and the outer peripheral wall of the corresponding resonant rod 20 are spaced apart, a parallel plate capacitor can be formed between the resonant engagement structure 40 and the outer peripheral wall of the corresponding resonant rod 20. Based on this, the resonant rod 20 with the resonant engagement structure 40 spaced apart on its outer periphery can not only form a parallel plate capacitor with the second plate 12 through its end wall near the second plate 12, but also form a parallel plate capacitor through its outer peripheral wall spaced apart from the resonant engagement structure 40.

[0072] Among them, such as Figure 3 , Figure 4 As shown, in some embodiments, the resonant coordination structure 40 can be a ring structure, which can be a closed ring or an open ring, and can be a circular ring, a rectangular ring, or other ring shapes, etc. In other embodiments, the resonant coordination structure 40 can include one or more sheet-like structures. When multiple sheet-like structures are provided, the multiple sheet-like structures are arranged sequentially along the circumference of the corresponding resonant rod 20. The sheet-like structures can be straight plates, arc-shaped plates, or other curved plates.

[0073] The extension length of the resonant mating structure 40 along the axial direction of the resonant rod 20 can be set as needed. Theoretically, it is permissible to "set the resonant mating structure 40 to be longer and the resonant rod 20 to be shorter along the axial direction of the resonant rod 20," but this may make tuning somewhat difficult.

[0074] By adopting the above scheme, and by adding a resonant engagement structure 40 connected to the second plate 12 to the outer periphery of at least one resonant rod 20, and by spacing the resonant engagement structure 40 from the outer peripheral wall of the corresponding resonant rod 20, the resonant rod 20 with the resonant engagement structure 40 on its outer periphery can form a parallel plate capacitor not only through the end wall of the resonant rod 20 near the second plate 12 and spaced apart from the second plate 12, but also through the outer peripheral wall of the resonant rod 20 and spaced apart from the resonant engagement 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 resonant engagement 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 improving the filtering performance and frequency selectivity characteristics of the filter. Furthermore, the resonant coupling 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 resonant coupling structure 40 and the resonant rod 20, the size of the resonant coupling 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.

[0075] Please see Figure 3 , Figure 4 In some embodiments of this application, a resonant engagement structure 40 is provided on the outer periphery of the first resonant rod 20a. The resonant engagement structure 40 provided on the outer periphery of the first resonant rod 20a is the first resonant engagement structure 40a, and the first coupling member 31 abuts against the outer wall of the first resonant engagement structure 40a.

[0076] By adopting the above scheme, with the first coupling member 31 disposed between the first resonant rod 20a and the second resonant rod 20b, the first coupling member 31 being relatively close to the first resonant rod 20a and relatively far from the second resonant rod 20b, and the first coupling member 31 and the second coupling member 32 being spaced apart, by having the first coupling member 31 abut against the outer wall of the first resonant coupling structure 40a, a direct physical connection can be formed between the first coupling member 31 and the first resonant coupling structure 40a. This strengthens the coupling between the first coupling member 31 and the first resonant rod 20a, and enhances the energy transfer efficiency between the first resonant rod 20a and the capacitive coupling structure 30. Therefore, 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.

[0077] Furthermore, since the first coupling member 31 abuts against the outer wall of the first resonant mating structure 40a, there is no gap between the first coupling member 31 and the first resonant mating structure 40a. This facilitates the processing and forming of the first coupling member 31 and the positioning and mating between the first coupling member 31 and the first resonant mating structure 40a. 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.

[0078] Of course, in other embodiments, the first coupling member 31 may be spaced apart from the outer wall of the first resonant mating structure 40a.

[0079] Please see Figure 3 , Figure 4 In some embodiments of this application, a resonant engagement structure 40 is provided on the outer periphery of the second resonant rod 20b. The resonant engagement structure 40 provided on the outer periphery of the second resonant rod 20b is the second resonant engagement structure 40b, and the second coupling member 32 abuts against the outer wall of the second resonant engagement structure 40b.

[0080] By adopting the above scheme, with the second coupling member 32 disposed between the first resonant rod 20a and the second resonant rod 20b, the second coupling member 32 being relatively close to the second resonant rod 20b and relatively far from the first resonant rod 20a, and the first coupling member 31 and the second coupling member 32 being spaced apart, by having the second coupling member 32 abut against the outer wall of the second resonant coupling structure 40b, a direct physical connection can be formed between the second coupling member 32 and the second resonant coupling structure 40b. This strengthens the coupling between the second coupling member 32 and the second resonant rod 20b, and enhances the energy transfer efficiency between the second resonant rod 20b and the capacitive coupling structure 30. Therefore, 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.

[0081] Furthermore, since the second coupling member 32 abuts against the outer wall of the second resonant mating structure 40b, there is no gap between the second coupling member 32 and the second resonant mating structure 40b. This facilitates the processing and forming of the second coupling member 32 and the positioning and mating between the second coupling member 32 and the second resonant mating 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.

[0082] This embodiment is particularly suitable for use in conjunction with the previous embodiment. This configuration enhances the coupling between the first coupling member 31 and the first resonant rod 20a, and also enhances the coupling between the second coupling member 32 and the second resonant rod 20b. This significantly optimizes the capacitive coupling effect achieved between the first and second resonant rods 20a and 20b via the capacitive coupling structure 30, thereby improving coupling stability and reliability, and enhancing the frequency selectivity and filtering performance of the filter. Furthermore, the seamless connection between the first coupling member 31 and the first resonant coupling structure 40a, and between the second coupling member 32 and the second resonant coupling structure 40b, facilitates the processing, shaping, and positioning of the first and second coupling members 31 and 32. This improves the ease of shaping, precision, consistency, and reliability of the capacitive coupling structure 30, thereby enhancing the consistency, quality, and yield of the filter, and reducing the filter's defect rate.

[0083] Of course, either the embodiment in which "the first coupling member 31 abuts against the outer wall of the first resonant mating structure 40a" or the embodiment in which "the second coupling member 32 abuts against the outer wall of the second resonant mating structure 40b" can be configured.

[0084] Of course, in other embodiments, the second coupling member 32 may be spaced apart from the outer wall of the second resonant mating structure 40b.

[0085] Please see Figure 3 , Figure 4 In some embodiments of this application, the resonant mating structure 40 is a ring structure, which is sleeved on the outer periphery of the corresponding resonant rod 20, and the inner ring wall of the ring structure is spaced apart from the outer periphery wall of the corresponding resonant rod 20.

[0086] It should be noted that the resonant coupling structure 40 is a ring structure. The ring structure can be a closed ring or an open ring, and can be circular, rectangular, or other shapes. The ring structure is fitted around the outer periphery of the corresponding resonant rod 20, and the inner ring wall of the ring structure is spaced apart from the outer periphery wall of the corresponding resonant rod 20.

[0087] By adopting the above scheme, making the resonant coupling structure 40 a ring structure, and fitting the ring structure around the outer periphery of the corresponding resonant rod 20, with the inner ring wall of the ring structure spaced apart from the outer periphery wall of the corresponding resonant rod 20, a large and uniform capacitance region can be formed between the inner ring wall of the ring structure and the outer periphery wall of the corresponding resonant rod 20. Based on this, not only can the total capacitance between the resonant rod 20 and the second plate 12, and between the resonant rod 20 and the resonant coupling structure 40 be increased, but the capacitance distribution can also be balanced and uniform. This reduces the resonant frequency generated by the resonant rod 20 and reduces the risk of frequency shift or instability caused by uneven capacitance distribution, thereby improving the filter's filtering performance and frequency selectivity characteristics.

[0088] Please see Figure 3 , Figure 4 In some embodiments of this application, the resonant mating structure 40 is provided in a one-to-one correspondence with the resonant rod 20. That is, the resonant mating structure 40 is provided on the outer periphery of the resonant rod 20 in a one-to-one manner.

[0089] By adopting the above scheme, each resonant rod 20 can be provided with a resonant engagement structure 40 on its outer periphery. This increases the capacitance value corresponding to each resonant rod 20 and reduces the resonant frequency of each resonant rod 20, ensuring that the resonant frequency of each resonant rod 20 meets the passband requirements of the filter. Furthermore, the size, spacing, or relative area of ​​the corresponding resonant engagement structure 40 can be individually designed and adjusted according to the specific needs of each resonant rod 20, thereby precisely controlling the resonant frequency of each resonant rod 20. This optimizes the filter's filtering performance and frequency selectivity characteristics. Moreover, the one-to-one correspondence between the resonant engagement structure 40 and the resonant rod 20 allows them to form a modular resonator design, facilitating standardized filter production and mass production and assembly.

[0090] Please see Figure 3 , Figure 4 In some embodiments of this application, the first coupling member 31, the second coupling member 32, each resonant mating structure 40, and the second plate 12 are an integrated structure.

[0091] It should be noted that the first coupling element 31, the second coupling element 32, each resonant engagement structure 40, and the second plate 12 are an integrated structure, meaning that the first coupling element 31, the second coupling element 32, each resonant engagement structure 40, and the second plate 12 are integrally formed, so that the first coupling element 31, the second coupling element 32, and each resonant engagement 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 first coupling element 31, the second coupling element 32, each resonant engagement structure 40, and the second plate 12 are made of the same material, and the whole is a metal part (for example, it can be made of aluminum), or the surface is covered with a metal layer (the part located inside the metal layer can be made of non-metallic materials).

[0092] By adopting the above scheme, and integrating the first coupling element 31, the second coupling element 32, each resonant engagement structure 40, and the second plate 12 into a single structure, it is easier to process and mold the first coupling element 31, the second coupling element 32, each resonant engagement structure 40, and the second plate 12 together, thereby improving processing convenience, processing efficiency, processing accuracy, structural consistency, and structural reliability. Furthermore, it eliminates the need for connecting parts between the first coupling element 31 and the second plate 12, between the second coupling element 32 and the second plate 12, and between the resonant engagement structures 40 and the second plate 12, thus simplifying the filter structure, facilitating filter simplification and weight reduction, and improving filter integration. On the one hand, it can simplify the positioning and assembly processes between the first coupling member 31 and the second plate 12, between the second coupling member 32 and the second plate 12, between each resonant mating structure 40 and the second plate 12, between the first coupling member 31 and the second coupling member 32, between the first coupling member 31 and each resonant mating structure 40, and between the second coupling member 32 and each resonant mating structure 40. Moreover, after the integral molding process, there is no need for secondary processing to form the gap between the first coupling member 31 and the first plate 11, or the gap between the second coupling member 32 and the first plate 11. This simplifies the processing and assembly processes of the filter, improves the production convenience, production efficiency and production accuracy of the filter, and facilitates the mass production of the filter. On the one hand, it can improve the accuracy of parameters (such as shape, extension length, etc.) of the first coupling member 31, the second coupling member 32, each resonant mating structure 40, and the second plate 12, and improve the positional accuracy and state stability between the first coupling member 31 and the second plate 12, between the second coupling member 32 and the second plate 12, between each resonant mating structure 40 and the second plate 12, between the first coupling member 31 and the second coupling member 32, between the first coupling member 31 and each resonant mating structure 40, and between the second coupling member 32 and each resonant mating structure 40. In the integral molding process, the first coupling member 31 and the second coupling member 32 can be precisely spaced and coupled relative to each other, so that the first coupling member 31 and the second coupling member 32 can form a reliable and effective capacitive coupling structure 30. The capacitive coupling structure 30 can be precisely located between the first resonant rod 20a and the second resonant rod 20b, and the first resonant rod 20a and the second resonant rod 20b can 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.

[0093] This embodiment is particularly suitable for use in conjunction with the embodiment in which "the first coupling member 31 abuts against the outer wall of the first resonant mating structure 40a". When the first coupling member 31 abuts against the outer wall of the first resonant mating structure 40a, there is no gap between the first coupling member 31 and the first resonant mating structure 40a. If the first coupling member 31, the second coupling member 32, each resonant mating structure 40, and the second plate 12 are an integrated structure, then the first coupling member 31 is integrally connected to both the surface of the second plate 12 and the outer wall of the first resonant mating structure 40a. Based on this, compared to the solution of "the first coupling member 31, the second coupling member 32, each resonant mating structure 40, and the second plate 12 are integrally formed, but a gap is left between the first coupling member 31 and the first resonant mating structure 40a", the solution of "the first coupling member 31 is integrally connected to the plate surface of the second plate 12 and also integrally connected to the outer wall of the first resonant mating structure 40a" is more convenient to form and process, and can improve processing accuracy and structural strength. It can reduce the risk of poor electrical performance caused by the gap between the first coupling member 31 and the first resonant mating structure 40a, thereby improving the consistency, quality and yield of the filter and reducing the defect rate of the filter.

[0094] This embodiment is particularly suitable for use in conjunction with the embodiment in which "the second coupling member 32 abuts against the outer wall of the second resonant mating structure 40b". When the second coupling member 32 abuts against the outer wall of the second resonant mating structure 40b, there is no gap between the second coupling member 32 and the second resonant mating structure 40b. If the first coupling member 31, the second coupling member 32, each resonant mating structure 40, and the second plate 12 are an integrated structure, then the second coupling member 32 is integrally connected to both the surface of the second plate 12 and the outer wall of the second resonant mating structure 40b. Based on this, compared to the scheme where "the first coupling member 31, the second coupling member 32, each resonant mating structure 40, and the second plate 12 are integrally formed, but a gap is left between the second coupling member 32 and the second resonant mating structure 40b", the scheme where "the second coupling member 32 is integrally connected to both the plate surface of the second plate 12 and the outer wall of the second resonant mating 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 member 32 and the second resonant mating structure 40b, thereby improving the consistency, quality, and yield of the filter and reducing the defect rate of the filter.

[0095] Of course, in other embodiments, some of the "first coupling member 31, second coupling member 32, each resonant coordination structure 40, and second plate 12" may be an integrated structure, while the other part may be assembled separately; or all of the "first coupling member 31, second coupling member 32, each resonant coordination structure 40, and second plate 12" may be assembled separately.

[0096] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 In some embodiments of this application, the filter includes a coupling adjustment structure 50, which is correspondingly configured with a capacitive coupling structure 30 and is separately connected to the second plate 12.

[0097] It should be noted that the coupling adjustment structure 50 is separately connected to the second plate 12 and is correspondingly set with the capacitive coupling structure 30. It is used to adjust the coupling strength and coupling effect of the capacitive coupling achieved by the capacitive coupling structure 30. Specifically, when the first resonant rod 20a and the second resonant rod 20b are two adjacent resonant rods 20, the coupling adjustment structure 50 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 two non-adjacent resonant rods 20, the coupling adjustment structure 50 is used to adjust the zero-point strength and adjust the passband out-of-band suppression.

[0098] like Figure 3 , Figure 4 As shown, in some embodiments, the coupling adjustment structure 50 may be a coupling adjustment screw threaded to the second plate 12. The coupling adjustment structure 50 can rotate and move axially relative to the second plate 12, thereby adjusting the length of the portion of the coupling adjustment structure 50 extending into the filter, and thus achieving coupling adjustment. In other embodiments, the coupling adjustment structure 50 may be axially limited and rotatably connected to the second plate 12. The coupling adjustment structure 50 can change its relative distance and / or relative area with the capacitive coupling structure 30 by rotation, thereby achieving coupling adjustment.

[0099] By adopting the above scheme, the coupling strength and coupling effect of the capacitive coupling achieved by the capacitive coupling structure 30 can be conveniently, quickly and precisely adjusted through the coupling adjustment structure 50, thereby accurately adjusting and optimizing the filter performance and frequency selection characteristics of the filter.

[0100] Please see Figure 2 , Figure 3 , Figure 4 In some embodiments of this application, the coupling adjustment structure 50 is disposed on the side of the capacitive coupling structure 30. That is, the coupling adjustment structure 50 is disposed on the same side of both the first coupling member 31 and the second coupling member 32.

[0101] By adopting the above scheme, placing the coupling adjustment structure 50 beside the capacitive coupling structure 30 effectively optimizes the layout between the coupling adjustment structure 50 and the capacitive coupling structure 30. This largely avoids the coupling adjustment structure 50 occupying space in the gap between the first coupling member 31 and the second coupling member 32, reducing space constraints or layout conflicts caused by the coupling adjustment structure 50. This allows for efficient use of the filter's internal space and improves the filter's structural compactness. Furthermore, it allows the coupling adjustment structure 50 to adapt to the flat first coupling member 31 and the second coupling member 32, enabling the coupling adjustment structure 50 to form a larger relative area with the first coupling member 31 and the second coupling member 32, thus facilitating the adjustment of coupling by the coupling adjustment structure 50.

[0102] This embodiment is particularly suitable for situations where "the space between the first resonant rod 20a and the second resonant rod 20b is small", and is especially suitable for the needs of miniaturized filters.

[0103] Of course, in other embodiments, the coupling adjustment structure 50 may be disposed between the first coupling member 31 and the second coupling member 32.

[0104] Please see Figure 3 , Figure 4 In some embodiments of this application, each resonant rod 20 and the first plate 11 are an integrated structure.

[0105] It should be noted that each resonant rod 20 and the first plate 11 are integrally formed, meaning that each resonant rod 20 and the first plate 11 are integrally molded, so that each resonant rod 20 is integrally connected to the first plate 11. The integral molding method can be, but is not limited to, powder metallurgy molding. In this case, each resonant rod 20 and the first plate 11 are made of the same material, and are entirely metal (e.g., stainless steel, iron, etc.), or have a metal coating (the part supporting the metal layer can be made of non-metallic materials).

[0106] By adopting the above scheme, and making each resonant rod 20 and the first plate 11 an integrated structure, on the one hand, it is easier to process and mold 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 each resonant rod 20 and the first plate 11, thereby simplifying the filter structure, which is conducive to the simplification and weight reduction of the filter, and can improve the integration of the filter; on the other hand, it can improve the accuracy of the parameters (such as shape, size, etc.) of each resonant rod 20 and the first plate 11, and improve the positional accuracy and state stability between each resonant rod 20 and the first plate 11, thereby improving the consistency, quality, and yield of the filter; on the other hand, it can simplify the connection parts between each resonant rod 20 and the first plate 11. The positioning and assembly processes between rod 20 and the first plate 11, especially when the filter housing 10 is assembled with multiple parts closed, allow the internal arrangement of each resonant rod 20 of the filter to be completed. At the same time, the capacitive coupling structure 30 is precisely positioned between the first resonant rod 20a and the second resonant rod 20b, enabling capacitive coupling between the first resonant rod 20a and the second resonant rod 20b. This greatly reduces the need to add other materials inside the filter, significantly reduces the amount of assembly materials, and greatly simplifies the filter assembly process. It enables the filter to be produced and assembled quickly, simply, and conveniently with very few steps, thereby improving the production convenience and efficiency of the filter and facilitating mass production of the filter.

[0107] Please see Figure 3 , Figure 4 , Figure 5 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.

[0108] 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 , Figure 4 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 5 (as shown), etc. The cavity 15 can be a hole structure, a groove structure, etc.

[0109] Multiple cavities 15 may be interconnected or not, but each cavity 15 is not connected to the interior of the filter housing 10.

[0110] 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.

[0111] Of course, in other embodiments, the outer surface of the filter housing 10 may not have the cavity 15.

[0112] 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 in that, include: The filter housing has a first plate and a second plate arranged opposite to each other; 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. 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, both connected to the second plate and spaced apart from the first plate. 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. The first coupling member and the second coupling member are arranged opposite each other at intervals.

2. The filter as described in claim 1, characterized in that, The first coupling member and / or the second coupling member are integrally connected to the second plate.

3. The filter as described in claim 1, characterized in that, The filter includes a resonant engagement structure connected to the side of the second plate facing the first plate. The resonant engagement structure is provided on the outer periphery of at least one of the resonant rods, and the resonant engagement structure is spaced apart from the outer peripheral wall of the corresponding resonant rod.

4. The filter as described in claim 3, characterized in that, The first resonant rod has the resonant engagement structure on its outer periphery, and the resonant engagement structure on the outer periphery of the first resonant rod is the first resonant engagement structure. The first coupling member abuts against the outer wall of the first resonant engagement structure. And / or, the outer periphery of the second resonant rod is provided with the resonant engagement structure, the resonant engagement structure provided on the outer periphery of the second resonant rod is the second resonant engagement structure, and the second coupling member abuts against the outer wall of the second resonant engagement structure.

5. The filter as described in claim 3, characterized in that, The resonant structure is a ring structure, which is sleeved on the outer periphery of the corresponding resonant rod, and the inner ring wall of the ring structure is spaced apart from the outer periphery wall of the corresponding resonant rod.

6. The filter as described in claim 3, characterized in that, The resonant fitting structure is configured in a one-to-one correspondence with the resonant rod.

7. The filter as described in any one of claims 3-6, characterized in that, The first coupling element, the second coupling element, each of the resonant mating structures, and the second plate are an integrated structure.

8. The filter as described in any one of claims 1-6, characterized in that, The filter includes a coupling adjustment structure, which is correspondingly arranged with the capacitive coupling structure and is separately connected to the second plate. The coupling adjustment structure is located on the side of the capacitive coupling structure.

9. The filter as described in any one of claims 1-6, characterized in that, Each of the resonant rods is an integral structure with the first plate.

10. The filter as described in any one of claims 1-6, characterized in that, The outer surface of the filter housing has a cavity, which is not connected to the interior of the filter housing.

Images