Filter

Abstract

The utility model relates to the field of communication, and provides a filter, which comprises a filter shell, a plurality of resonance rods and a capacitive coupling structure, the plurality of resonance rods are arranged in the filter shell, 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, the first resonance rod is provided with a first coupling hole, the second resonance rod is provided with a second coupling hole, and each capacitive coupling structure comprises a coupling piece; one end of the coupling piece penetrates through the first coupling hole and is in conductive connection with the first resonance rod, and the other end of the coupling piece penetrates through the second coupling hole and is in insulated connection with the second resonance rod. According to the capacitive coupling structure, the first resonance rod and the second resonance rod can be promoted to realize capacitive coupling mainly through the coupling piece, the structure 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] Filter housing;

[0007] Multiple resonant rods are provided and disposed within the filter housing. 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, wherein the capacitive coupling structure 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 first resonant rod is provided with a first coupling hole, and the second resonant rod is provided with a second coupling hole. The capacitive coupling structure includes a coupling member, one end of which passes through the first coupling hole and is electrically connected to the first resonant rod, and the other end of which passes through the second coupling hole and is insulated from the second resonant rod.

[0009] In some embodiments, the capacitive coupling structure includes an insulating sleeve disposed between the coupling member and the second coupling hole.

[0010] In some embodiments, the coupling member has a through portion inserted into the second coupling hole, and a stepped portion disposed at one end of the through portion away from the second coupling hole, the stepped portion being spaced apart from the opening of the second coupling hole;

[0011] The insulating sleeve includes an insulating cylindrical portion, which is sleeved between the through portion and the second coupling hole.

[0012] In some embodiments, the insulating sleeve includes an insulating ring portion disposed at one end of the insulating cylindrical portion, the insulating ring portion extending outward along the circumference of the insulating cylindrical portion and stopping between the stepped portion and the opening of the second coupling hole.

[0013] In some embodiments, the second coupling hole is a blind hole, and the through portion is spaced apart from the bottom of the second coupling hole.

[0014] In some embodiments, the insulating sleeve includes an insulating protrusion connected to the edge of the insulating cylindrical portion away from the opening of the second coupling hole, and extending inward.

[0015] In some embodiments, the insulating sleeve is a dielectric element.

[0016] In some embodiments, the first coupling hole is a through hole.

[0017] In some embodiments, the filter housing includes a first plate, and each of the resonant rods is an integral structure with the first plate.

[0018] In some embodiments, the coupling element abuts against and is securely connected to the wall of the first coupling hole.

[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 the first resonant rod and the second resonant rod to achieve capacitive coupling between the first and second resonant rods. Specifically, the capacitive coupling structure can be achieved by having one end of a coupling member pass through a first coupling hole and be electrically connected to the first resonant rod, and the other end of the coupling member pass through a second coupling hole and be insulated from the second resonant rod. This allows the coupling member to be relatively stably installed between the first and second resonant rods, enabling a relatively stable coupling path to be formed between them. Furthermore, the coupling member can be grounded at one end and ungrounded at the other end, thus ensuring that the capacitive coupling structure reliably and stably achieves capacitive coupling rather than inductive coupling between the first and second resonant rods. Based on this, the capacitive coupling structure can mainly achieve capacitive coupling between the first and second resonant rods through the coupling element. 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 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, which is conducive to the miniaturization, simplification, and lightweighting of the filter, and can improve the integration, consistency, and reliability of the filter. It can simplify the assembly process of the filter, improve the assembly convenience and efficiency of the filter, facilitate the mass production of the filter, and reduce the material cost and production cost of the filter. It can facilitate the filter to build a stable and reliable capacitive coupling relationship as needed through the capacitive coupling structure, and can maintain and optimize the filtering performance and frequency selectivity characteristics of the filter. 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 cross-sectional view along AA shows that the first resonant rod and the second resonant rod are two adjacent resonant rods.

[0026] Figure 4 for Figure 1A schematic diagram of the filter's decomposition is provided;

[0027] Figure 5 A front view of a filter provided for other embodiments of this application;

[0028] Figure 6 for Figure 5 The provided cross-sectional view along BB shows that the first resonant rod and the second resonant rod are two non-adjacent resonant rods.

[0029] The following are the labeling elements in the figure:

[0030] 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, 21-First coupling hole, 22-Second coupling hole, 30-Capacitive coupling structure, 31-Coupled element, 311-Through-through part, 312-Step part, 32-Insulating sleeve, 321-Insulating cylinder part, 322-Insulating ring part, 323-Insulating protrusion, 40-Coupling rib, 50-Coupling adjustment structure. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In this application, "central axis" refers to a line that passes through the geometric center of the corresponding structure.

[0036] In this application, "axial" refers to the direction of extension of the central axis of the corresponding structure, "radial" refers to any direction of the corresponding structure that passes through and is perpendicular to the central axis, and "circumferential" refers to the direction of circumference of the outer circumference of the corresponding structure.

[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 , Figure 4Some embodiments of this application provide a filter, including a filter housing 10, resonant rods 20, and a capacitive coupling structure 30. Multiple resonant rods 20 are provided and disposed within the filter housing 10. 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, capacitively coupling the first resonant rods 20a and 20b. The first resonant rod 20a has a first coupling hole 21, and the second resonant rod 20b has a second coupling hole 22. The capacitive coupling structure 30 includes a coupling member 31. One end of the coupling member 31 passes through the first coupling hole 21 and is electrically connected to the first resonant rod 20a, while the other end of the coupling member 31 passes through the second coupling hole 22 and is insulated from the second resonant rod 20b.

[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, material, etc. 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 5 , Figure 6Each 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 40, 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] The resonant rod 20 is connected and fixed to the wall of the filter housing 10. In some embodiments, one end of the resonant rod 20 may be directly or via other components connected and fixed to the first plate 11 to fix it relative to the filter housing 10; the end of the resonant rod 20 away from the first plate 11 may be spaced apart from the second plate 12 and form a parallel plate capacitor therebetween.

[0047] The resonant rod 20 can be directly connected and fixed to the wall of the filter housing 10 (e.g., the first plate 11) by means of integral connection, welding, riveting, pressing, plugging, screw fastening, threaded connection, snap-fit, etc., or it can be indirectly connected and fixed to the wall of the filter housing 10 (e.g., the first plate 11) through other structures connected to it (e.g., base, mounting post, coupling rib 40, etc.).

[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 , 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.

[0051] Or, such as Figure 6As 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 first resonant rod 20a is provided with a first coupling hole 21, and the second resonant rod 20b is provided with a second coupling hole 22. The capacitive coupling structure 30 includes a coupling element 31. The coupling element 31 can be made entirely of metal or coated with a metal layer (the part used to support the metal layer can be made of non-metallic material). Along the axial direction of the coupling element 31 (i.e., the extension direction of the central axis of the coupling element 31), the first coupling hole 21, the coupling element 31, and the second coupling hole 22 are correspondingly and aligned. One end of the coupling element 31 passes through the first coupling hole 21 and is electrically connected to the first resonant rod 20a, and the other end of the coupling element 31 passes through the second coupling hole 22 and is insulated from the second resonant rod 20b. In the first coupling hole 21, the coupling member 31 can be electrically connected to the first resonant rod 20a by conductive connection with at least one of the hole wall, the opening of the first coupling hole 21, or the outer peripheral wall of the first resonant rod 20a. This conductive connection can be a direct conductive connection (e.g., abutment, welding, threaded connection, etc.) or an indirect conductive connection achieved through other metal components. In the second coupling hole 22, the coupling member 31 can be insulated from the second resonant rod 20b by non-conductive connection with the hole wall, the opening of the second coupling hole 22, or the outer peripheral wall of the second resonant rod 20b. This non-conductive connection can be achieved through direct spacing or through mutual insulation by insulating components.

[0054] Based on the fact that "one end of the coupling member 31 passes through the first coupling hole 21 and is electrically connected to the first resonant rod 20a, and the other end of the coupling member 31 passes through the second coupling hole 22 and is insulated from the second resonant rod 20b", the coupling member 31 can be relatively stably installed between the first resonant rod 20a and the second resonant rod 20b, and can relatively stably form a coupling path between the first resonant rod 20a and the second resonant rod 20b, which can promote the first resonant rod 20a and the second resonant rod 20b to form coupling through the coupling member 31; and since one end of the coupling member 31 is grounded and the other end is not grounded, the coupling member 31 can promote the first resonant rod 20a and the second resonant rod 20b to form capacitive coupling rather than inductive coupling.

[0055] The first coupling hole 21 can be a through hole or a blind hole, and the second coupling hole 22 can be a through hole or a blind hole. The specific settings can be made according to the needs of convenient installation and coupling strength.

[0056] 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 to achieve 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 be achieved by having one end of the coupling member 31 pass through the first coupling hole 21 and be electrically connected to the first resonant rod 20a, and the other end of the coupling member 31 pass through the second coupling hole 22 and be insulated from the second resonant rod 20b. This allows the coupling member 31 to be relatively stably installed between the first resonant rod 20a and the second resonant rod 20b, enabling the coupling member 31 to form a relatively stable coupling path between the first resonant rod 20a and the second resonant rod 20b. Furthermore, the coupling member 31 can be grounded at one end and ungrounded at the other end, thus 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 via the coupling member 31. Based on this, the capacitive coupling structure 30 can mainly achieve capacitive coupling between the first resonant rod 20a and the second resonant rod 20b through the coupling element 31. Compared with the existing capacitive coupling structure of the filter, at least the insulating bracket, fastening screw and fastening nut and other components 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, which is conducive to the miniaturization, simplification and weight reduction of the filter, and can improve the integration, consistency and reliability of the filter; it can simplify the assembly process of the filter, improve the assembly convenience and assembly efficiency of the filter, facilitate the mass production of the filter, and reduce the material cost and production cost of the filter; it can facilitate the filter to build a stable and reliable capacitive coupling relationship as needed through the capacitive coupling structure 30, and can maintain and optimize the filtering performance and frequency selectivity characteristics of the filter.

[0057] 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.

[0058] Furthermore, since the coupling element 31 can form a direct, short, and reliable coupling path between the first resonant rod 20a and the second resonant rod 20b, it is beneficial to reduce the signal and energy transmission delay between the first resonant rod 20a and the second resonant rod 20b, and to enhance the coupling strength between the first resonant rod 20a and the second resonant rod 20b, thereby improving the performance of the filter.

[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] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, in some embodiments, the filter includes a coupling adjustment structure 50, which is separately connected to the wall of the filter housing 10 (e.g., 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 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 not adjacent resonant rods 20, the coupling adjustment structure 50 is used to adjust the zero-point strength and to tune the passband out-of-band rejection.

[0061] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the capacitive coupling structure 30 includes an insulating sleeve 32, which is sleeved between the coupling member 31 and the second coupling hole 22.

[0062] It should be noted that the insulating sleeve 32 is made of insulating material and is fitted between the coupling member 31 and the second coupling hole 22 to insulate the coupling member 31 and the second coupling hole 22.

[0063] By adopting the above scheme, an insulating sleeve 32 can be sleeved between the coupling element 31 and the second coupling hole 22 to insulate and block the connection between the coupling element 31 and the second coupling hole 22, thereby preventing the outer peripheral wall of the coupling element 31 from conducting with the hole wall of the second coupling hole 22. This allows for convenient, quick, and reliable insulated connection between the coupling element 31 and the second resonant rod 20b. It also facilitates stable and reliable single-end ungrounding of the coupling element 31, enabling the capacitive coupling structure 30 to reliably and stably promote capacitive coupling of the first resonant rod 20a and the second resonant rod 20b instead of inductive coupling through the coupling element 31 and the insulating sleeve 32. This maintains and optimizes the filtering performance and frequency selectivity characteristics of the filter. Furthermore, the insulating sleeve 32 helps to stabilize the relative state and position between the coupling element 31 and the second coupling hole 22, effectively reducing the risk of the coupling element 31 wobbling relative to the second coupling hole 22 and coming into contact with the hole wall of the second coupling hole 22. This improves the installation stability, installation accuracy, and installation reliability between the capacitive coupling structure 30 and the second resonant rod 20b, enhances the overall structural stability and reliability of the capacitive coupling structure 30, and facilitates the capacitive coupling structure 30 in enabling the first resonant rod 20a and the second resonant rod 20b to achieve stable and reliable capacitive coupling.

[0064] Of course, in other embodiments, the coupling member 31 may be spaced apart from the hole wall of the second coupling hole 22, the hole opening of the second coupling hole 22, and the outer peripheral wall of the second resonant rod 20b, so that the coupling member 31 is insulated and non-conductively connected to the second resonant rod 20b. In this case, the capacitive coupling structure 30 may only include the coupling member 31, and the insulating sleeve 32 may be omitted.

[0065] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the coupling member 31 has a through portion 311 inserted into the second coupling hole 22, and a stepped portion 312 disposed at one end of the through portion 311 away from the second coupling hole 22, the stepped portion 312 being spaced apart from the opening of the second coupling hole 22; the insulating sleeve 32 includes an insulating cylindrical portion 321, the insulating cylindrical portion 321 being sleeved between the through portion 311 and the second coupling hole 22.

[0066] It should be noted that the through-hole portion 311 is the part of the coupling member 31 that is inserted into the second coupling hole 22, used to connect the coupling member 31 to the second resonant rod 20b. The stepped portion 312 is located at the end of the through-hole portion 311 away from the second coupling hole 22. The stepped portion 312 and the through-hole portion 311 together form a stepped structure. The function of the stepped portion 312 is to facilitate limiting and positioning by maintaining a certain distance from the opening of the second coupling hole 22. The insulating cylindrical portion 321 is the cylindrical part of the insulating sleeve 32 that is fitted between the through-hole portion 311 and the second coupling hole 22, used to insulate and block the through-hole portion 311 from the second coupling hole 22.

[0067] By adopting the above scheme, the capacitive coupling structure 30 can be precisely inserted into the second coupling hole 22 through the through-hole 311 of the coupling member 31, thus forming a reliable connection with the second resonant rod 20b; the insulating sleeve 321 of the insulating sleeve 32 can be sleeved on and insulatingly blocked between the through-hole 311 and the second coupling hole 22, thereby forming a stable insulating layer between the through-hole 311 and the second coupling hole 22; the stepped portion 312 of the coupling member 31 can be spaced from the opening of the second coupling hole 22, thus preventing the stepped portion 312 from contacting and conducting with the second resonant rod 20b. Based on this, the connection between the capacitive coupling structure 30 and the second resonant rod 20b can be achieved conveniently, quickly, stably, and reliably, improving the installation accuracy, installation stability, and installation reliability of the capacitive coupling structure 30 and the second resonant rod 20b. Furthermore, the coupling element 31 is insulated from the wall of the second coupling hole 22, the opening of the second coupling hole 22, and the outer peripheral wall of the second resonant rod 20b, thus maintaining the insulation between the coupling element 31 and the second resonant rod 20b. This facilitates the capacitive coupling structure 30 to reliably and stably achieve capacitive coupling between the first resonant rod 20a and the second resonant rod 20b via the coupling element 31 and the insulating sleeve 32, thereby maintaining and optimizing the filter's filtering performance and frequency selectivity characteristics.

[0068] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the insulating sleeve 32 includes an insulating ring portion 322 disposed at one end of the insulating cylinder portion 321. The insulating ring portion 322 extends outward along the circumference of the insulating cylinder portion 321 and stops between the stepped portion 312 and the opening of the second coupling hole 22.

[0069] It should be noted that the insulating ring portion 322 is located at one end of the insulating cylinder portion 321 that extends outward from the opening of the second coupling hole 22, and extends outward along the circumference of the insulating cylinder portion 321. The insulating ring portion 322 may be in the form of a closed ring (e.g., Figure 4As shown), it can also be in the form of an open ring. Based on the spacing between the stepped portion 312 and the opening of the second coupling hole 22, the insulating ring portion 322 is located and stops between the stepped portion 312 and the opening of the second coupling hole 22, that is, the insulating ring portion 322 stops and cooperates with the opening of the second coupling hole 22, and also stops and cooperates with the stepped portion 312.

[0070] By adopting the above scheme, the insulating ring portion 322 of the insulating sleeve 32 can be physically stopped between the step portion 312 and the opening of the second coupling hole 22, so as to play a positioning and limiting role in the fit between the coupling member 31, the insulating sleeve 32 and the second coupling hole 22 during the installation process, and promote the precise and stable relative state and relative position between the coupling member 31, the insulating sleeve 32 and the second coupling hole 22, thereby improving the installation accuracy, installation stability and installation reliability between the capacitive coupling structure 30 and the second resonant rod 20b. Furthermore, based on the spacing between the stepped portion 312 and the opening of the second coupling hole 22, the insulating ring portion 322 stops and insulatingly blocks the space between the stepped portion 312 and the opening of the second coupling hole 22. This allows a stable insulating layer to be formed between the stepped portion 312 and the opening of the second coupling hole 22 via the insulating ring portion 322. Based on this, the insulating sleeve 32 can form an insulating layer between the through portion 311 and the wall of the second coupling hole 22 via the insulating cylinder portion 321. The insulating ring portion 322 can also provide insulation between the stepped portion 312 and the opening of the second coupling hole 22. Another layer of insulation protection is formed between the openings of the two coupling holes 22, so that the insulating sleeve 32 can reliably block the potential conduction path between the coupling member 31 and the second resonant rod 20b through multiple insulation protections, and reliably maintain the insulation between the coupling member 31 and the second resonant rod 20b. This allows the capacitive coupling structure 30 to reliably and stably promote the capacitive coupling of the first resonant rod 20a and the second resonant rod 20b through the coupling member 31 and the insulating sleeve 32, and can maintain and optimize the filtering performance and frequency selectivity characteristics of the filter.

[0071] Of course, in other embodiments, the insulating ring portion 322 may be omitted from the insulating sleeve 32, based on the fact that the stepped portion 312 and the opening of the second coupling hole 22 are spaced apart.

[0072] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the second coupling hole 22 is a blind hole, and the through portion 311 is spaced apart from the bottom of the second coupling hole 22.

[0073] By adopting the above solution, when the second coupling hole 22 is a blind hole, by keeping the through part 311 at a distance from the bottom of the second coupling hole 22, it is possible to prevent the through part 311 from making contact with the bottom of the second coupling hole 22. Based on this, it is possible to ensure that the coupling member 31 is not conductive and is insulated from the hole wall, the bottom of the second coupling hole 22, the opening of the second coupling hole 22, and the outer peripheral wall of the second resonant rod 20b. This can reliably block the potential conductive path between the coupling member 31 and the second resonant rod 20b, and reliably maintain the insulation between the coupling member 31 and the second resonant rod 20b. Therefore, it is possible for the capacitive coupling structure 30 to reliably and stably enable the first resonant rod 20a and the second resonant rod 20b to achieve capacitive coupling via the coupling member 31 and the insulating sleeve 32, thereby maintaining and optimizing the filtering performance and frequency selectivity characteristics of the filter.

[0074] Of course, in other embodiments, the second coupling hole 22 can be a through hole.

[0075] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the insulating sleeve 32 includes an insulating protrusion 323, which is connected to the edge of the opening of the insulating cylindrical portion 321 away from the opening of the second coupling hole 22 and extends inward.

[0076] It should be noted that the insulating protrusion 323 is connected to the edge of the opening of the insulating cylindrical portion 321 away from the opening of the second coupling hole 22, and extends inward from the edge of the opening (i.e., towards the side closer to the central axis of the insulating cylindrical portion 321). The through portion 311 can be inserted into the space formed by the insulating protrusion 323 and the insulating cylindrical portion 321.

[0077] In some embodiments, the insulating protrusion 323 occupies a portion of the opening of the insulating cylindrical portion 321 away from the opening of the second coupling hole 22, that is, the insulating protrusion 323 does not close the opening of the insulating cylindrical portion 321 away from the opening of the second coupling hole 22. For example, the insulating protrusion 323 may be a ring structure, a straight structure, a cross-shaped structure, etc., or the insulating protrusion 323 may include multiple block-shaped structures spaced apart along the insulating cylindrical portion 321, etc. Based on this, when the through part 311 is inserted into the space formed by the insulating protrusion 323 and the insulating cylindrical portion 321, it is easy to expel air from the gaps in the insulating protrusion 323 and the insulating cylindrical portion 321, and it is easy for the through part 311 to be inserted tightly against the insulating protrusion 323, thereby improving the fit and fixing effect between the through part 311 and the insulating sleeve 32, and reducing the risk of the through part 311 loosening and falling out of the insulating sleeve 32. Furthermore, since the through-hole 311 can be inserted into the insulating protrusion 323, the deviation between the overall length of the capacitive coupling structure 30 and the preset length can be reduced, which can make the actual installation position of the coupling member 31 fit the preset installation position, thus maintaining and improving the installation accuracy and positional accuracy of the coupling member 31. Of course, in other embodiments, the insulating protrusion 323 can close the opening of the insulating cylinder 321 away from the opening of the second coupling hole 22, and a pressure relief hole can be provided in the insulating cylinder 321 as needed to facilitate the discharge of air from the pressure relief hole.

[0078] By adopting the above scheme, the insulating sleeve 32 can form a space for the insertion part 311 to be accurately inserted by the insulating protrusion 323 and the insulating cylinder part 321 together. This can play a positioning and limiting role in the fit between the coupling member 31 and the insulating sleeve 32 during the installation process, and promote the precise and stable relative state and relative position between the coupling member 31 and the insulating sleeve 32. This can improve the installation accuracy, installation stability and installation reliability between the coupling member 31 and the insulating sleeve 32, and improve the overall structural stability and reliability of the capacitive coupling structure 30.

[0079] This embodiment is particularly suitable for use in conjunction with an embodiment where "the second coupling hole 22 is a blind hole, and the through portion 311 and the bottom of the second coupling hole 22 are spaced apart". Based on the spaced-apart arrangement between the through portion 311 and the bottom of the second coupling hole 22, the insulating sleeve 32 can be positioned between the through portion 311 and the bottom of the second coupling hole 22 via an insulating protrusion 323, thereby forming a stable insulating layer between the through portion 311 and the bottom of the second coupling hole 22. Based on this, the insulating sleeve 32 can form an insulating layer between the through portion 311 and the second coupling hole 22 via the insulating cylindrical portion 321, and another insulating layer between the through portion 311 and the bottom of the second coupling hole 22 via the insulating protrusion 323. This allows the insulating sleeve 32 to reliably block the potential conduction path between the coupling member 31 and the second resonant rod 20b through multiple insulating protections, and reliably maintain the insulation between the coupling member 31 and the second resonant rod 20b. This facilitates the capacitive coupling structure 30 to reliably and stably promote the capacitive coupling of the first resonant rod 20a and the second resonant rod 20b through the coupling member 31 and the insulating sleeve 32, and can maintain and optimize the filtering performance and frequency selectivity characteristics of the filter.

[0080] Of course, this embodiment is also suitable for use in conjunction with the embodiment where "the second coupling hole 22 is a through hole".

[0081] Of course, in other embodiments, the insulating sleeve 32 may omit the insulating protrusion 323.

[0082] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the insulating sleeve 32 is a dielectric element.

[0083] It should be noted that the insulating sleeve 32 is a dielectric component made of a dielectric material, meaning that the insulating sleeve 32 has both insulating properties and a dielectric constant. The dielectric constant of the insulating sleeve 32 can be set as needed. For example, in some embodiments, the insulating sleeve 32 is made of PTFE (Polytetrafluoroethylene).

[0084] By adopting the above scheme, and by using the insulating sleeve 32 as a dielectric element, the insulating sleeve 32 can be used as a dielectric between the outer peripheral wall of the coupling element 31 and the hole wall of the second coupling hole 22, while providing insulation between the insulating sleeve 32 and the coupling element 31 and the second coupling hole 22. This facilitates the formation of a capacitor between the coupling element 31 and the second coupling hole 22, and makes it easier for the capacitive coupling structure 30 to achieve stable and reliable capacitive coupling between the first resonant rod 20a and the second resonant rod 20b.

[0085] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the first coupling hole 21 is a through hole.

[0086] By adopting the above solution, and by making the first coupling hole 21 a through hole, the coupling member 31 can be easily inserted from the side of the first coupling hole 21 away from the second coupling hole 22 for assembly, thereby improving the assembly convenience and efficiency of the coupling member 31 and the capacitive coupling structure 30. This embodiment is particularly applicable to the situation where "the first resonant rod 20a and the second resonant rod 20b are integrally connected to the wall of the filter housing 10 (e.g., the first plate 11)" and the situation where "the first resonant rod 20a and the second resonant rod 20b are first separately connected to the wall of the filter housing 10 (e.g., the first plate 11), and then the capacitive coupling structure 30 is assembled".

[0087] Of course, in other embodiments, when the first resonant rod 20a is separately connected to the wall of the filter housing 10 (e.g., the first plate 11), the first coupling hole 21 can be a blind hole. In this case, the assembly between the capacitive coupling structure 30 and the first resonant rod 20a must be performed first, and then the assembly between the first resonant rod 20a and the wall of the filter housing 10 (e.g., the first plate 11) must be performed.

[0088] Please see Figure 3 , Figure 4 In some embodiments of this application, the filter housing 10 includes a first plate 11, and each resonant rod 20 is integrated with the first plate 11.

[0089] It should be noted that the first plate 11 is the wall of the filter housing 10 to which the resonant rod 20 is connected. All resonant rods 20 and the first plate 11 are integrally formed, that is, each resonant rod 20 and the first plate 11 are integrally formed, so that each resonant rod 20 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, 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 material).

[0090] 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; furthermore, 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. This improves the consistency, quality, and yield of the filter. On the one hand, it simplifies the positioning and assembly processes between each resonant rod 20 and the first plate 11. In particular, it allows the resonant rods 20 to be arranged inside the filter while the multiple parts of the filter housing 10 are being assembled. This greatly reduces the need to add other materials inside the filter, significantly reduces the amount of assembly materials, and greatly simplifies the 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 mass production.

[0091] Please see Figure 3 , Figure 4 , Figure 6 In some embodiments of this application, the coupling member 31 abuts against and is securely connected to the wall of the first coupling hole 21.

[0092] It should be noted that the outer peripheral wall of the coupling member 31 abuts against the hole wall of the first coupling hole 21 and is grounded. Furthermore, the coupling member 31 and the hole wall of the first coupling hole 21 are also firmly connected and fixed to each other. The firm connection method is not limited to the use of a fixed connection method or a detachable connection method. For example, welding, threaded connection, interference fit, snap-fit, crimping, adhesive and other connection methods can be used.

[0093] By adopting the above scheme, by making the outer peripheral wall of the coupling member 31 abut against the hole wall of the first coupling hole 21, the coupling member 31 can be directly and reliably electrically connected to the hole wall of the first coupling hole 21, thereby achieving a conductive connection to the first resonant rod 20a without the need for additional grounding components or complex structures. This allows for convenient, quick, and reliable conductive connection between the coupling member 31 and the first resonant rod 20a, and facilitates stable and reliable single-end grounding of the coupling member 31. This also allows the capacitive coupling structure 30 to facilitate capacitive coupling of the first resonant rod 20a and the second resonant rod 20b instead of inductive coupling, thus maintaining and optimizing the filter's filtering performance and frequency selectivity characteristics.

[0094] Furthermore, by ensuring a stable connection between the coupling element 31 and the wall of the first coupling hole 21, the relative state and position between the coupling element 31 and the first coupling hole 21 can be stabilized, and the coupling element 31 can be fixed relative to the first resonant rod 20a. This improves the installation stability, installation accuracy, and installation reliability between the capacitive coupling structure 30 and the first resonant rod 20a, reduces the risk of the capacitive coupling structure 30 becoming loose, and facilitates the stable and reliable capacitive coupling of the first resonant rod 20a and the second resonant rod 20b by the capacitive coupling structure 30. This also improves the reliability and consistency of the filter product.

[0095] 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.

[0096] 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 in the image), etc. The cavity 15 can be a hole structure, a groove structure, etc.

[0097] The multiple cavities 15 may be interconnected or not, but each cavity 15 is not connected to the interior of the filter housing 10. For example, when the cavity 15 is located in the region corresponding to the resonant rod 20, the cavity 15 is not connected to the interior of the filter housing 10. In particular, the cavity 15 corresponding to the first resonant rod 20a is not connected to the first coupling hole 21, and the cavity 15 corresponding to the second resonant rod 20b is not connected to the second coupling hole 22.

[0098] 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 parts with the cavity 15 (such as the resonant rod 20) can have complete surfaces and normally influence the distribution and transmission of the electric field and current, thereby enabling the functional parts with the cavity 15 (such as the resonant rod 20) to work normally and efficiently, maintaining the frequency selectivity and filtering performance of the filter.

[0099] Of course, in other embodiments, the outer surface of the filter housing 10 may not have the cavity 15.

[0100] 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: Filter housing; Multiple resonant rods are provided and disposed within the filter housing. 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, wherein the capacitive coupling structure 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 first resonant rod is provided with a first coupling hole, and the second resonant rod is provided with a second coupling hole. The capacitive coupling structure includes a coupling member, one end of which passes through the first coupling hole and is electrically connected to the first resonant rod, and the other end of which passes through the second coupling hole and is insulated from the second resonant rod.

2. The filter as described in claim 1, characterized in that, The capacitive coupling structure includes an insulating sleeve, which is sleeved between the coupling member and the second coupling hole.

3. The filter as described in claim 2, characterized in that, The coupling member has a through portion that is inserted into the second coupling hole, and a stepped portion provided at one end of the through portion away from the second coupling hole, the stepped portion being spaced apart from the opening of the second coupling hole; The insulating sleeve includes an insulating cylindrical portion, which is sleeved between the through portion and the second coupling hole.

4. The filter as described in claim 3, characterized in that, The insulating sleeve includes an insulating ring portion disposed at one end of the insulating cylindrical portion. The insulating ring portion extends outward along the circumference of the insulating cylindrical portion and stops between the stepped portion and the opening of the second coupling hole.

5. The filter as described in claim 3, characterized in that, The second coupling hole is a blind hole, and the through part is spaced apart from the bottom of the second coupling hole.

6. The filter as described in claim 3, characterized in that, The insulating sleeve includes an insulating protrusion, which is connected to the edge of the insulating cylinder away from the opening of the second coupling hole and extends inward.

7. The filter as described in any one of claims 2-6, characterized in that, The insulating sleeve is a dielectric component.

8. The filter as described in any one of claims 1-6, characterized in that, The first coupling hole is a through hole.

9. The filter as described in claim 8, characterized in that, The filter housing includes a first plate, and 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 coupling element abuts against and is securely connected to the wall of the first coupling hole; 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.

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