Filter

Abstract

The present application relates to the field of radio frequency devices. Provided is a filter, comprising a filter housing (10) and resonant rod assemblies (20), the resonant rod assemblies (20) comprising resonant rods (21). At least one of the resonant rods (21) is provided with a first coupling member (211), the first coupling member (211) extending towards a resonant rod (21) of an adjacent resonant rod assembly (20); and the resonant rod (21) capacitively coupled to the first coupling member (211) is provided with a second coupling member (212), the second coupling member (212) extending towards the first coupling member (211) and being used to be capacitively coupled to the first coupling member (211). The two resonant rods (21) of the at least one group of adjacent resonant rod assemblies (20) can achieve capacitive coupling by means of the first coupling member (211) and the second coupling member (212) without the need of introducing structures such as a coupling rod, thereby reducing the number of parts of filters, and simplifying the structure of filters.

Description

filter

[0001] This application claims priority to the Chinese patent application with application number 202310936707.2 and application name “Filter” filed with the State Intellectual Property Office of the People’s Republic of China on July 26, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of radio frequency devices, and in particular relates to a filter. Background Art

[0003] Existing filters typically include a filter housing, a resonant rod disposed within the housing, and a coupling rod disposed between the two resonant rods to achieve capacitive coupling between the two resonant rods. To achieve capacitive coupling, the coupling rod must be insulated and mounted within the filter housing. In existing designs, the coupling rod is typically mounted to the filter housing via an insulating structure. This insulating structure not only insulates the coupling rod from the filter housing but also provides support and fixation for the coupling rod. Consequently, existing filters have a relatively large number of components and a relatively complex structure.

[0004] Application Contents

[0005] The embodiments of the present application provide a filter, aiming to solve the problem that existing filters have a relatively large number of components and a relatively complex structure.

[0006] To achieve the above-mentioned object, the technical solution adopted in the embodiment of the present application is: a filter, comprising a filter housing, and a plurality of resonant rod assemblies arranged in the filter housing, wherein the resonant rod assembly comprises at least one resonant rod;

[0007] At least one of the resonant rods is provided with a first coupling member, wherein the first coupling member extends toward the resonant rod of the adjacent resonant rod assembly and is used for capacitive coupling with the resonant rod of the adjacent resonant rod assembly;

[0008] The resonant rod capacitively coupled with the first coupling member is provided with a second coupling member, and the second coupling member extends toward the first coupling member and is used for capacitive coupling with the first coupling member.

[0009] In some embodiments, the first coupling member includes a first extension portion extending toward the second coupling member;

[0010] Alternatively, the first coupling member includes a first extending portion extending toward the second coupling member, and a first coupling portion bent and connected to an end portion of the first extending portion.

[0011] In some embodiments, the second coupling member includes a second extension portion extending toward the first coupling member;

[0012] Alternatively, the second coupling member includes a second extending portion extending toward the first coupling member, and a second coupling portion bent and connected to an end portion of the second extending portion.

[0013] In some embodiments, the first coupling member is integrally connected to the free end of the corresponding resonant rod; and / or the second coupling member is integrally connected to the free end of the corresponding resonant rod.

[0014] In some embodiments, the resonant rod assembly includes a first coupling rib, wherein the first coupling rib is connected between adjacent resonant rods of the same resonant rod assembly.

[0015] In some embodiments, at least one of the resonant rods is provided with a third coupling member, and the third coupling member is extended toward the adjacent resonant rod of the same resonant rod assembly.

[0016] In some embodiments, the third coupling member includes a third extension portion extending toward the adjacent resonant rod of the same resonant rod assembly;

[0017] Alternatively, the third coupling member includes a third extending portion extending toward the adjacent resonant rod of the same resonant rod assembly, and a third coupling portion bent and connected to an end portion of the third extending portion.

[0018] In some embodiments, the filter housing is provided with a first coupling window, and the first coupling window is provided between adjacent resonant rod assemblies, for coupling at least one group of two resonant rods that are opposite to each other along the first coupling window;

[0019] And / or, the filter further includes a second coupling rib connected between adjacent resonant rod assemblies.

[0020] In some embodiments, the filter further includes a third coupling rib, wherein the third coupling rib is connected between two resonant rods of adjacent resonant rod assemblies and is used to cross-couple the two resonant rods of adjacent resonant rod assemblies.

[0021] In some embodiments, the filter also includes a fourth coupling rib connected between adjacent resonant rod assemblies, the fourth coupling rib having a first end and a second end relative to each other, the first end being connected to the resonant rod of one of the resonant rod assemblies, and the second end being connected between two adjacent resonant rods of another resonant rod assembly.

[0022] In some embodiments, at least one of the third coupling ribs and at least one of the fourth coupling ribs are common coupling ribs.

[0023] In some embodiments, the third coupling rib is arranged to extend in a curve.

[0024] In some embodiments, at least one of the resonant rods connected to the third coupling rib is provided with a mounting groove for allowing the corresponding end portion of the third coupling rib to be limitedly mounted therein.

[0025] In some embodiments, at least one of the resonant rods connected to the third coupling rib is provided with a support portion for supporting a corresponding end portion of the third coupling rib.

[0026] In some embodiments, the filter includes two signal transmission ends installed on the filter housing, wherein one of the signal transmission ends is coupled to the resonant rod of one of the resonant rod assemblies, and the other signal transmission end is coupled to the resonant rod of the other resonant rod assembly.

[0027] In some embodiments, at least one of the signal transmission ends is provided with an inner conductor;

[0028] At least one of the resonant rod components is provided with a coupling hole corresponding to the inner conductor. The inner conductor passes through the coupling hole and is coupled to the at least one resonant rod.

[0029] In some embodiments, the filter housing includes a first plate for mounting the resonant rod assembly, a second plate disposed opposite the first plate, and a housing body connected between the second plate and the first plate, wherein the second plate, the housing body, and the first plate together enclose a closed inner cavity;

[0030] Among them, the shell body is integrally connected to the second plate, and the shell body is separately connected to the first plate; or, the shell body is separately connected to the second plate, and the shell body is separately connected to the first plate; or, the shell body is separately connected to the second plate, and the shell body is integrally connected to the first plate.

[0031] In some embodiments, the filter housing is provided with a partition wall between two adjacent resonant rod assemblies, and the partition wall is separately connected to the first plate.

[0032] In some embodiments, the partition wall is integrally connected to the shell body and / or the second plate.

[0033] In some embodiments, the resonant rod assembly is integrally formed from a sheet metal substrate.

[0034] The filter provided by this application has the following beneficial effects:

[0035] In the filter provided by the embodiment of the present application, in at least one group of two resonant rods belonging to adjacent resonant rod assemblies, a coupling relationship between the two resonant rods is reliably established by providing one of the resonant rods with a first coupling member extending toward the other resonant rod, and providing the other resonant rod with a second coupling member extending toward one of the resonant rods, so as to capacitively couple the first coupling member and the second coupling member. Based on this, since the first coupling member and the second coupling member are respectively provided on the two resonant rods, capacitive coupling can be achieved without introducing external structures such as coupling rods and insulating structures supporting the coupling rods, thereby effectively reducing the number of parts of the filter, effectively simplifying the structure of the filter, and facilitating the miniaturization, simplification, and lightweighting of the filter product, thereby reducing the material cost and manufacturing cost of the filter product, and improving the assembly efficiency of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] FIG1 is a schematic three-dimensional diagram of a filter provided in an embodiment of the present application;

[0038] FIG2 is a cross-sectional view taken along AA provided in FIG1 ;

[0039] FIG3 is an exploded schematic diagram of the filter provided in FIG1 ;

[0040] FIG4 is a perspective schematic diagram of the first resonant rod assembly provided in FIG3 ;

[0041] FIG5 is a perspective schematic diagram of the second resonant rod assembly, the third resonant rod assembly, and the second coupling rib provided in FIG3 ;

[0042] FIG6 is a perspective schematic diagram of the second plate, the shell body and the partition wall provided in FIG3 ;

[0043] FIG7 is a schematic diagram of the topological structure of the filter provided in FIG1 ;

[0044] FIG8 is a simulation waveform diagram of the filter provided in FIG1 ;

[0045] FIG9 is a schematic diagram of the topological structure of a filter provided in another embodiment of the present application;

[0046] FIG10 is a simulation waveform diagram of the filter provided in FIG9 .

[0047] Among them, the reference numerals in the figures are:

[0048] 10-filter housing, 11-inner cavity, 12-isolation wall, 121-first coupling window, 122-second coupling window, 123-third coupling window, 124-fourth coupling window; 13-first plate, 14-second plate, 15-shell body, 151-side wall; 20-resonance rod assembly, 20a-first resonant rod assembly, 20b-second resonant rod assembly, 20c-third resonant rod assembly; 21-resonance rod, 21a-first resonant rod, 21b-second resonant rod, 21c-third resonant rod, 21d-fourth resonant rod, 21e-fifth resonant rod, 21f-sixth resonant rod, 21g-seventh resonant rod, 21h-eighth resonant rod Vibration rod, 21i-ninth resonant rod, 21j-tenth resonant rod; 211-first coupling member, 2111-first extension portion, 2112-first coupling portion; 212-second coupling member, 2121-second extension portion, 2122-second coupling portion; 213-connecting end, 214-free end; 215-third coupling member, 2151-third extension portion, 2152-third coupling portion; 216-mounting groove, 217-support portion; 218-coupling hole; 22-first coupling rib; 30-second coupling rib, 40-third coupling rib, 50-fourth coupling rib, 51-first end, 52-second end; 60-signal transmission end, 61-inner conductor. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clear and understandable, the present application is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0050] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0051] 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 being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0052] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0053] Existing filters typically include a filter housing, a resonant rod disposed within the housing, and a coupling rod disposed between the two resonant rods to achieve capacitive coupling between the two resonant rods. To achieve capacitive coupling, the coupling rod must be insulated and mounted within the filter housing. In existing designs, the coupling rod is typically mounted to the filter housing via an insulating structure. This insulating structure not only insulates the coupling rod from the filter housing but also provides support and fixation for the coupling rod. Consequently, existing filters have a relatively large number of components and a relatively complex structure.

[0054] Therefore, the present application provides a filter that can reduce the number of components, simplify the structure, and facilitate the miniaturization, simplification, and lightweighting of the filter product.

[0055] The following describes the specific implementation of this application in detail with reference to specific embodiments:

[0056] Referring to Figures 1, 2, and 3, some embodiments of the present application provide a filter, comprising a filter housing 10, and a plurality of resonant rod assemblies 20 disposed within the filter housing 10, wherein the resonant rod assembly 20 includes at least one resonant rod 21. At least one resonant rod 21 is provided with a first coupling member 211, which extends toward the resonant rod 21 of an adjacent resonant rod assembly 20 and is configured to capacitively couple with the resonant rod 21 of the adjacent resonant rod assembly 20; the resonant rod 21 capacitively coupled with the first coupling member 211 is provided with a second coupling member 212, which extends toward the first coupling member 211 and is configured to capacitively couple with the first coupling member 211.

[0057] It should be noted that the filter housing 10 has a closed inner cavity 11 within it, which provides shielding and prevents signal leakage. This inner cavity 11 can be divided into at least one resonant cavity, which can accommodate a resonant rod 21. This embodiment does not limit the shape, size, or material of the filter housing 10.

[0058] It should also be noted that the resonant rod assembly 20 includes one resonant rod 21 or multiple resonant rods 21 arranged in a row. The number of resonant rod assemblies 20 is at least two, and the multiple resonant rod assemblies 20 are all arranged in the filter housing 10 and are arranged in columns. That is, at least two resonant rod assemblies 20 are located in two different columns. The number of resonant rod assemblies 20 arranged in the same column can be one or more, and this embodiment does not impose any restrictions on this.

[0059] Among them, the resonant rod 21 is a metal part, which can be a sheet metal part. The resonant rod 21 has a connecting end 213 connected to the filter housing 10, and a free end 214 opposite to the connecting end 213. The connecting end 213 of the resonant rod 21 is the end of the resonant rod 21 connected to the filter housing 10 (for example, the first plate 13), and the free end 214 of the resonant rod 21 is the end of the resonant rod 21 away from its connecting end 213 and spaced apart from the filter housing 10 (for example, the second plate 14). Optionally, the resonant rod 21 can be connected to the filter housing 10 by, but not limited to, welding, integral connection, riveting, crimping, screw fastening, threaded connection, clamping, etc., and this embodiment does not limit this.

[0060] It should also be noted that the filter housing 10 is provided with a partition wall 12 between adjacent resonant rod assemblies 20. The partition wall 12 isolates the resonant rods 21 between adjacent resonant rod assemblies 20 that do not need to be coupled, shielding irrelevant signals and preventing signal interference, thereby forming a complete and orderly signal transmission channel within the filter. Coupling windows (e.g., a first coupling window 121, a second coupling window 122, a third coupling window 123, a fourth coupling window 124, etc.) may be provided in the partition wall 12, through which two resonant rods 21 facing each other along the coupling window can establish a coupling relationship.

[0061] In this embodiment, the filter housing 10 is provided with a second coupling window 122 on the isolation wall 12 between adjacent resonant rod assemblies 20. The second coupling window 122 is located between the two resonant rods 21 that are capacitively coupled through the first coupling member 211 and the second coupling member 212, and is used for allowing at least one of the first coupling member 211 and the second coupling member 212 to pass through it, so as to facilitate capacitive coupling between the first coupling member 211 and the second coupling member 212.

[0062] It should also be noted that, in at least one group of two resonant rods 21 of adjacent resonant rod assemblies 20, one of the resonant rods 21 is provided with a first coupling member 211 extending toward the other resonant rod 21, and correspondingly, the other resonant rod 21 is provided with a second coupling member 212 extending toward one of the resonant rods 21. At least one of the first coupling member 211 and the second coupling member 212 is disposed through the second coupling window 122, and the first coupling member 211 and the second coupling member 212 are capacitively coupled. Based on this, capacitive coupling can be achieved between the two resonant rods 21 of at least one group of adjacent resonant rod assemblies 20 through the first coupling member 211 and the second coupling member 212, thereby reliably establishing a coupling relationship therebetween. Since the first coupling member 211 and the second coupling member 212 are respectively disposed on the two resonant rods 21, capacitive coupling can be achieved without introducing external structures such as coupling rods and insulating structures supporting the coupling rods, thereby effectively reducing the number of components of the filter and effectively simplifying the structure of the filter.

[0063] Among them, the two resonant rods 21 that are capacitively coupled through the first coupling member 211 and the second coupling member 212 can adjust the gap and the facing area between the first coupling member 211 and the second coupling member 212 to adjust the coupling strength therebetween.

[0064] The two resonant rods 21 that are capacitively coupled by the first coupling member 211 and the second coupling member 212 belong to different resonant rod assemblies 20, but the two resonant rods 21 may be adjacent or non-adjacent on the main signal transmission path. If the two resonant rods 21 are adjacent on the main signal transmission path, that is, they are two resonant rods 21 located at the ends of the resonant rod assemblies 20 of adjacent resonant rod assemblies 20, then the capacitive coupling achieved by the two resonant rods 21 through the first coupling member 211 and the second coupling member 212 is a coupling relationship on the main signal transmission path, that is, the coupling relationship between the two resonant rods 21 is cascaded. If the two resonant rods 21 are non-adjacent on the main signal transmission path, then the capacitive coupling achieved by the two resonant rods 21 through the first coupling member 211 and the second coupling member 212 is cross-capacitive coupling, that is, the coupling relationship between the two resonant rods 21 is non-cascaded.

[0065] Among them, the two resonant rods 21 that are capacitively coupled by the first coupling member 211 and the second coupling member 212 belong to different resonant rod assemblies 20, and the two resonant rod assemblies 20 can be located in the same column or in different columns. When the two resonant rods 21 that are capacitively coupled by the first coupling member 211 and the second coupling member 212 belong to two resonant rod assemblies 20 in different columns, by adopting the technical solution of "respectively arranging the first coupling member 211 and the second coupling member 212 on the two resonant rods 21 to achieve capacitive coupling" provided in the embodiment of the present application, the structure of the filter can be more effectively simplified and the internal space of the filter can be saved.

[0066] The two resonant rods 21 that achieve capacitive coupling through the first coupling member 211 and the second coupling member 212 may be arranged relative to each other or not, and this embodiment does not impose any limitation on this.

[0067] The first coupling member 211 may be integrally connected to the corresponding resonant rod 21 or separately connected, and this embodiment does not impose any restrictions on this. The first coupling member 211 may be disposed at the free end 214 of the corresponding resonant rod 21, or at any position between the free end 214 and the connection end 213 of the corresponding resonant rod 21, and this embodiment does not impose any restrictions on this. Similarly, the second coupling member 212 may be integrally connected to the corresponding resonant rod 21 or separately connected, and this embodiment does not impose any restrictions on this. The second coupling member 212 may be disposed at the free end 214 of the corresponding resonant rod 21, or at any position between the free end 214 and the connection end 213 of the corresponding resonant rod 21, and this embodiment does not impose any restrictions on this.

[0068] There is at least one second coupling window 122 , at least one resonant rod 21 is provided with a first coupling member 211 , and at least one resonant rod 21 is provided with a second coupling member 212 .

[0069] For example, as shown in Figures 2 and 3, in one embodiment of a filter, ten resonant rods 21 are provided within the filter housing 10. The ten resonant rods 21 are respectively a first resonant rod 21a, a second resonant rod 21b, a third resonant rod 21c, a fourth resonant rod 21d, a fifth resonant rod 21e, a sixth resonant rod 21f, a seventh resonant rod 21g, an eighth resonant rod 21h, a ninth resonant rod 21i, and a tenth resonant rod 21j. The first resonant rod 21a, the second resonant rod 21b, and the third resonant rod 21c are arranged in a row and coupled in sequence to form a first resonant rod assembly 20a. The fourth resonant rod 21d, the fifth resonant rod 21e, the sixth resonant rod 21f, the seventh resonant rod 21g, and the eighth resonant rod 21h are arranged in a row and coupled in sequence to form a second resonant rod assembly 20b. The ninth resonant rod 21i and the tenth resonant rod 21j are arranged in a row and coupled in sequence to form a third resonant rod assembly 20c. The path along which the signal is transmitted in sequence along the first resonant rod 21a, the second resonant rod 21b, the third resonant rod 21c, the fourth resonant rod 21d, the fifth resonant rod 21e, the sixth resonant rod 21f, the seventh resonant rod 21g, the eighth resonant rod 21h, the ninth resonant rod 21i, and the tenth resonant rod 21j is the primary signal transmission path. The filter housing 10 is provided with a second coupling window 122 between the third resonant rod 21c and the fourth resonant rod 21d. The third resonant rod 21c is provided with a first coupling member 211 extending toward the fourth resonant rod 21d. The fourth resonant rod 21d is provided with a second coupling member 212 extending toward the third resonant rod 21c. The first coupling member 211 and the second coupling member 212 are capacitively coupled at the second coupling window 122, thereby achieving capacitive coupling between the third resonant rod 21c and the fourth resonant rod 21d.

[0070] In summary, the filter provided in the embodiment of the present application, in at least one group of two resonant rods 21 belonging to adjacent resonant rod assemblies 20, is configured such that one of the resonant rods 21 is provided with a first coupling member 211 extending toward the other resonant rod 21, and the other resonant rod 21 is provided with a second coupling member 212 extending toward one of the resonant rods 21, so as to reliably establish a coupling relationship between the two resonant rods 21 through capacitive coupling of the first coupling member 211 and the second coupling member 212. Based on this, since the first coupling member 211 and the second coupling member 212 are respectively provided on the two resonant rods 21, capacitive coupling can be achieved without introducing external structures such as coupling rods and insulating structures supporting the coupling rods, thereby effectively reducing the number of components of the filter, effectively simplifying the structure of the filter, and facilitating the miniaturization, simplification, and lightweighting of the filter product, thereby reducing the material cost and manufacturing cost of the filter product, and improving the assembly efficiency of the filter.

[0071] Optionally, referring to FIG. 2 , FIG. 3 , and FIG. 4 , in some embodiments of the present application, the first coupling member 211 includes a first extending portion 2111 extending toward the second coupling member 212 .

[0072] It should be noted that one end of the first extension portion 2111 is integrally or separately connected to the corresponding resonant rod 21. The other end of the first extension portion 2111 is extended toward the second coupling member 212. The extension direction of the first extension portion 2111 can be parallel to or non-parallel to the inner wall of the filter housing 10 for mounting the resonant rod 21; the extension direction of the first extension portion 2111 can be arbitrarily extended upward, downward, left, right, forward, or backward as needed; the extension path of the first extension portion 2111 can be, but is not limited to, a straight line; and so on, which are not limited to the present embodiment.

[0073] By adopting the above solution, the first coupling member 211 can be connected to the corresponding resonant rod 21 via the first extension 2111 and extend toward the second coupling member 212, thereby achieving capacitive coupling with the second coupling member 212 via the portion of the first extension 2111 away from the corresponding resonant rod 21. This simplifies the structure of the first coupling member 211, reduces the design and processing difficulty of the first coupling member 211, and saves costs for the first coupling member 211 and the resonant rod 21 equipped with the first coupling member 211. Furthermore, capacitive coupling can be conveniently, quickly, and reliably achieved between two resonant rods 21 in adjacent resonant rod assemblies 20 via the second coupling member 212 and the simplified first coupling member 211, thereby ensuring and improving the performance of the first coupling member 211.

[0074] Optionally, referring to Figures 2, 3, and 4, in some embodiments of the present application, the first coupling member 211 includes a first extension portion 2111 extending toward the second coupling member 212, and a first coupling portion 2112 bent and connected to the end of the first extension portion 2111.

[0075] It should be noted that, based on the previous embodiment, in which the first coupling member 211 is provided with a first extension portion 2111, the first coupling member 211 is further provided with a first coupling portion 2112. Specifically, one end of the first coupling portion 2112 is connected to the end of the first extension portion 2111 that is away from the corresponding resonant rod 21. The other end of the first coupling portion 2112 is bent relative to the first end thereof, and is configured to be disposed opposite and capacitively coupled to the second coupling member 212. The bending direction, extension direction, and extension length of the first coupling portion 2112 can be arbitrarily set as needed and are not limited in this embodiment.

[0076] Therefore, by adopting the above solution, the first coupling member 211 can be connected to the corresponding resonant rod 21 via the first extension portion 2111 and extend toward the second coupling member 212. This allows the first extension portion 2111 to reliably support the first coupling portion 2112 and position the first coupling portion 2112 close to the second coupling member 212. Furthermore, the first coupling portion 2112, connected to the end of the first extension portion 2111 away from the corresponding resonant rod 21 by bending, is positioned opposite the second coupling member 212, and capacitive coupling is achieved. This simplifies the structure of the first coupling member 211, reduces the design and processing difficulty of the first coupling member 211, and reduces the cost of the first coupling member 211 and the resonant rod 21 equipped with the first coupling member 211. At the same time, since the first coupling member 211 can protect and expand its facing area with the second coupling member 212 through the first coupling portion 2112, it is convenient for the two resonant rods 21 of the adjacent resonant rod assembly 20 to reliably achieve better capacitive coupling through the first coupling member 211 and the second coupling member 212, thereby effectively protecting and improving the performance of the first coupling member 211.

[0077] Optionally, referring to FIG. 2 , FIG. 3 , and FIG. 5 , in some embodiments of the present application, the second coupling member 212 includes a second extending portion 2121 extending toward the first coupling member 211 .

[0078] It should be noted that one end of the second extension portion 2121 is integrally or separately connected to the corresponding resonant rod 21. The other end of the second extension portion 2121 extends toward the first coupling member 211. The extension direction of the second extension portion 2121 can be parallel to or non-parallel to the inner wall of the filter housing 10 for mounting the resonant rod 21; the extension direction of the second extension portion 2121 can be any direction of extension upward, downward, left, right, front, or rear as needed; the extension path of the second extension portion 2121 can be, but is not limited to, a straight line; and so on, which are not limited to the present embodiment.

[0079] By adopting the above solution, the second coupling member 212 can be connected to the corresponding resonant rod 21 via the second extension 2121 and extend toward the first coupling member 211, thereby achieving capacitive coupling with the first coupling member 211 through the portion of the second extension 2121 away from the corresponding resonant rod 21. Based on this, the structure of the second coupling member 212 can be simplified, the design and processing difficulties of the second coupling member 212 can be reduced, and the cost of the second coupling member 212 and the resonant rod 21 equipped with the second coupling member 212 can be reduced. At the same time, the two resonant rods 21 of adjacent resonant rod assemblies 20 can be capacitively coupled conveniently, quickly, and reliably through the first coupling member 211 and the simplified second coupling member 212, thereby ensuring and improving the performance of the second coupling member 212.

[0080] Optionally, referring to Figures 2, 3, and 5, in some embodiments of the present application, the second coupling member 212 includes a second extension portion 2121 extending toward the first coupling member 211, and a second coupling portion 2122 bent and connected to the end of the second extension portion 2121.

[0081] It should be noted that, based on the previous embodiment, in which the second coupling member 212 is provided with a second extension portion 2121, the second coupling member 212 is further provided with a second coupling portion 2122. Specifically, one end of the second coupling portion 2122 is connected to the end of the second extension portion 2121 away from the corresponding resonant rod 21. The other end of the second coupling portion 2122 is bent relative to the first end thereof, and is configured to be disposed opposite to and capacitively coupled to the first coupling member 211 (particularly the first coupling portion 2112). The bending direction, extension direction, and extension length of the second coupling portion 2122 can be arbitrarily set as needed and are not limited in this embodiment.

[0082] Therefore, by adopting the above solution, the second coupling member 212 can be connected to the corresponding resonant rod 21 via the second extension portion 2121 and extend toward the first coupling member 211. This allows the second extension portion 2121 to reliably support the second coupling portion 2122 and position the second coupling portion 2122 close to the first coupling member 211. Furthermore, the second coupling portion 2122 is bent and connected to the end of the second extension portion 2121 away from the corresponding resonant rod 21, thereby being positioned opposite the first coupling member 211 and achieving capacitive coupling. This simplifies the structure of the second coupling member 212, reduces the design and manufacturing complexity of the second coupling member 212, and reduces the cost of the second coupling member 212 and the resonant rod 21 equipped with the second coupling member 212. At the same time, since the second coupling member 212 can ensure and expand its facing area with the first coupling member 211 through the second coupling portion 2122, it is convenient for the two resonant rods 21 of the adjacent resonant rod assembly 20 to reliably achieve better capacitive coupling through the second coupling member 212 and the first coupling member 211, thereby effectively ensuring and improving the performance of the second coupling member 212.

[0083] Optionally, as shown in FIG3 , when the first coupling member 211 is provided with a first coupling portion 2112 and the corresponding second coupling member 212 is provided with a second coupling portion 2122, the first coupling portion 2112 and the second coupling portion 2122 can be arranged parallel to each other. This arrangement can help ensure and increase the facing area between the first coupling portion 2112 and the second coupling portion 2122, which can help enhance the coupling therebetween.

[0084] Please refer to FIG. 2 , FIG. 3 , and FIG. 4 . In some embodiments of the present application, the first coupling member 211 is integrally connected to the free end 214 of the corresponding resonant rod 21 .

[0085] By adopting the above solution, the first coupling member 211 can be integrally connected and integrally formed with the corresponding resonant rod 21, making it easier to process the first coupling member 211 simultaneously with the corresponding resonant rod 21, thereby ensuring and improving the processing convenience of the first coupling member 211. Furthermore, by integrally connecting the first coupling member 211 to the free end 214 of the corresponding resonant rod 21, the first coupling member 211 can not only serve as a component for capacitive coupling with the second coupling member 212, but also serve as a resonant disk of the resonant rod 21, thereby correspondingly lowering the resonant frequency of the corresponding resonant cavity. In other words, the existing resonant disk of the resonant rod 21 can also be integrally formed (e.g., bent) to produce the first coupling member 211 required for capacitive coupling with the second coupling member 212, thereby further facilitating the processing of the first coupling member 211.

[0086] Please refer to FIG. 2 , FIG. 3 , and FIG. 5 . In some embodiments of the present application, the second coupling member 212 is integrally connected to the free end 214 of the corresponding resonant rod 21 .

[0087] By adopting the above solution, the second coupling member 212 can be integrally connected and integrally formed with the corresponding resonant rod 21, making it easier to form the second coupling member 212 simultaneously with the corresponding resonant rod 21, thereby ensuring and improving the processing convenience of the second coupling member 212. Furthermore, by integrally connecting the second coupling member 212 to the free end 214 of the corresponding resonant rod 21, the second coupling member 212 can not only serve as a component for capacitive coupling with the first coupling member 211, but also serve as a resonant disk of the resonant rod 21, thereby correspondingly lowering the resonant frequency of the corresponding resonant cavity. In other words, the existing resonant disk of the resonant rod 21 can also be integrally formed (e.g., bent) to produce the required second coupling member 212 for capacitive coupling with the first coupling member 211, thereby further facilitating the processing of the second coupling member 212.

[0088] Please refer to Figures 3, 4 and 5. In some embodiments of the present application, the resonant rod assembly 20 includes a first coupling rib 22, and the first coupling rib 22 is connected between adjacent resonant rods 21 of the same resonant rod assembly 20.

[0089] It should be noted that the resonant rod assembly 20 may include a plurality of resonant rods 21. For the multiple resonant rods 21 of the same resonant rod assembly 20, adjacent resonant rods 21 can be connected and coupled via the first coupling rib 22, so as to facilitate the transmission of signals from one resonant rod 21 to another resonant rod 21. The first coupling rib 22 can be connected to the connecting end 213 of the resonant rod 21, or it can be connected to any position between the connecting end 213 and the free end 214 of the resonant rod 21. The first coupling rib 22 and the corresponding resonant rod 21 can be connected as a whole or separately, and this embodiment does not impose any restrictions on this. The extension path of the first coupling rib 22 can be in the form of a straight line, a bending shape, etc., and this embodiment does not impose any restrictions on this.

[0090] For example, as shown in Figures 3, 4, and 5, in one example of the filter, in the first resonant rod assembly 20a, the first resonant rod 21a and the second resonant rod 21b, and the second resonant rod 21b and the third resonant rod 21c are connected and coupled via first coupling ribs 22, respectively, so that energy can be transmitted sequentially along the first resonant rod 21a, the second resonant rod 21b, and the third resonant rod 21c. In the second resonant rod assembly 20b, the fourth resonant rod 21d and the fifth resonant rod 21e, the fifth resonant rod 21e and the sixth resonant rod 21f, the sixth resonant rod 21f and the seventh resonant rod 21g, and the seventh resonant rod 21g and the eighth resonant rod 21h are connected and coupled via first coupling ribs 22, so that energy can be transmitted sequentially along the fourth resonant rod 21d, the fifth resonant rod 21e, the sixth resonant rod 21f, the seventh resonant rod 21g, and the eighth resonant rod 21h. In the third resonant rod assembly 20c, the ninth resonant rod 21i and the tenth resonant rod 21j are connected and coupled via the first coupling rib 22, allowing energy to be transmitted sequentially along the ninth resonant rod 21i and the tenth resonant rod 21j. This facilitates energy transmission within each resonant rod assembly 20 and helps form a primary signal transmission path.

[0091] By adopting the above solution, adjacent resonant rods 21 of the same resonant rod assembly 20 can be connected via the first coupling ribs 22, so that energy can be transmitted sequentially along each resonant rod 21 of the same resonant rod assembly 20. Based on this, it can be ensured that energy can be transmitted sequentially along the preset signal transmission path in the same resonant rod assembly 20, thereby ensuring the performance of the filter.

[0092] Please refer to Figures 3, 4 and 5. In some embodiments of the present application, at least one resonant rod 21 is provided with a third coupling member 215. The third coupling member 215 extends toward the adjacent resonant rod 21 of the same resonant rod assembly 20.

[0093] It should be noted that at least one resonant rod 21 is provided with a third coupling member 215. Some resonant rods 21 may not be provided with the third coupling member 215, while some resonant rods 21 may be provided with one or more third coupling members 215, as required. Of course, some resonant rod assemblies 20 may not have all resonant rods 21 provided with the third coupling member 215.

[0094] The third coupling member 215 provided on the resonant rod 21 can be extended toward the resonant rod 21 which belongs to the same resonant rod assembly 20 and is adjacent to the resonant rod 21, which is beneficial for the resonant rod 21 to be coupled with the resonant rod 21 which belongs to the same resonant rod assembly 20 and is adjacent to the resonant rod 21 through the third coupling member 215, that is, the resonant rod 21 can be enhanced in coupling with the resonant rod 21 which belongs to the same resonant rod assembly 20 and is adjacent to the resonant rod 21 through the third coupling member 215.

[0095] The third coupling member 215 may be connected to the corresponding resonant rod 21 in one piece or in a separate piece, and this embodiment does not impose any limitation on this.

[0096] For example, as shown in Figures 3, 4 and 5, in an example of the filter, in the first resonant rod assembly 20a, the first resonant rod 21a is provided with a third coupling member 215 extending toward the second resonant rod 21b, and the second resonant rod 21b is provided with a third coupling member 215 extending toward the first resonant rod 21a, which is beneficial to enhance the coupling between the first resonant rod 21a and the second resonant rod 21b; the second resonant rod 21b is provided with a third coupling member 215 extending toward the third resonant rod 21c, which is beneficial to enhance the coupling between the second resonant rod 21b and the third resonant rod 21c. In the second resonant rod assembly 20b, the fifth resonant rod 21e is provided with a third coupling member 215 extending toward the fourth resonant rod 21d, which is conducive to enhancing the coupling between the fourth resonant rod 21d and the fifth resonant rod 21e; ​​the fifth resonant rod 21e is provided with a third coupling member 215 extending toward the sixth resonant rod 21f, and the sixth resonant rod 21f is provided with a third coupling member 215 extending toward the fifth resonant rod 21e, which is conducive to enhancing the coupling between the fifth resonant rod 21e and the sixth resonant rod 21f; the sixth resonant rod 21f is provided with a third coupling member 215 extending toward the seventh resonant rod 21g, and the seventh resonant rod 21g is provided with a third coupling member 215 extending toward the sixth resonant rod 21f, which is conducive to enhancing the coupling between the sixth resonant rod 21f and the seventh resonant rod 21g; the seventh resonant rod 21g is provided with a third coupling member 215 extending toward the eighth resonant rod 21h, and the eighth resonant rod 21h is provided with a third coupling member 215 extending toward the seventh resonant rod 21g, which is conducive to enhancing the coupling between the seventh resonant rod 21g and the eighth resonant rod 21h. In the third resonant rod assembly 20c, the ninth resonant rod 21i is provided with a third coupling member 215 extending toward the tenth resonant rod 21j, which is beneficial to enhance the coupling between the ninth resonant rod 21i and the tenth resonant rod 21j.

[0097] By adopting the above solution, at least one resonant rod 21 can be provided with a third coupling member 215 extending toward an adjacent resonant rod 21 of the same resonant rod assembly 20, so that the resonant rod 21 can be coupled to an adjacent resonant rod 21 of the same resonant rod assembly 20 via the third coupling member 215, and the coupling can even be enhanced. Based on this, the coupling between two adjacent resonant rods 21 of the same resonant rod assembly 20 can be enhanced via the third coupling member 215, thereby effectively ensuring and improving the performance of the filter.

[0098] Optionally, referring to FIG. 3 , FIG. 4 , and FIG. 5 , in some embodiments of the present application, the third coupling member 215 includes a third extending portion 2151 extending toward an adjacent resonant rod 21 of the same resonant rod assembly 20 .

[0099] It should be noted that one end of the third extension portion 2151 is integrally or separately connected to the corresponding resonant rod 21. The other end of the third extension portion 2151 extends toward the adjacent resonant rod 21 of the same resonant rod assembly 20. The extension direction of the third extension portion 2151 can be parallel or non-parallel to the inner wall of the filter housing 10 for mounting the resonant rod 21; the extension direction of the third extension portion 2151 can be any direction, upward, downward, left, right, forward, or backward, as needed; the extension path of the third extension portion 2151 can be, but is not limited to, a straight line; and so on, all of which are not limited in this embodiment.

[0100] For example, as shown in Figures 3, 4 and 5, in an example of the filter, the third coupling member 215 provided on the second resonant rod 21b and extending toward the third resonant rod 21c, the third coupling member 215 provided on the sixth resonant rod 21f and extending toward the fifth resonant rod 21e, and the third coupling member 215 provided on the seventh resonant rod 21g and extending toward the eighth resonant rod 21h are all third coupling members 215 provided in this embodiment, that is, they include the third extension portion 2151.

[0101] By adopting the above solution, the third coupling member 215 can be connected to the corresponding resonant rod 21 via the third extension 2151 and extend toward the adjacent resonant rod 21 of the same resonant rod assembly 20. The portion of the third extension 2151 away from the corresponding resonant rod 21 is positioned opposite the adjacent resonant rod 21 of the same resonant rod assembly 20, thereby facilitating coupling between the resonant rod 21 and the adjacent resonant rod 21 of the same resonant rod assembly 20, and even enhancing the coupling. This simplifies the structure of the third coupling member 215, reduces the design and processing difficulty of the third coupling member 215, and saves costs for the third coupling member 215 and the resonant rod 21 equipped with the third coupling member 215. Furthermore, the third coupling member 215 can facilitate reliable and enhanced coupling between two adjacent resonant rods 21 of the same resonant rod assembly 20.

[0102] Optionally, referring to Figures 3, 4, and 5, in some embodiments of the present application, the third coupling member 215 includes a third extension portion 2151 extending toward the adjacent resonant rod 21 of the same resonant rod assembly 20, and a third coupling portion 2152 bent and connected to the end of the third extension portion 2151.

[0103] It should be noted that, based on the previous embodiment, i.e., in addition to the third coupling member 215 being provided with the third extension portion 2151, the third coupling member 215 is further provided with a third coupling portion 2152. Specifically, one end of the third coupling portion 2152 is connected to the end of the third extension portion 2151 that is away from the corresponding resonant rod 21. The other end of the third coupling portion 2152 is bent relative to the first end thereof, facilitating relative positioning and coupling with an adjacent resonant rod 21 of the same resonant rod assembly 20. The bending direction, extension direction, and extension length of the third coupling portion 2152 can be arbitrarily set as needed and are not limited in this embodiment.

[0104] Optionally, as shown in Figures 3, 4, and 5, when a third coupling portion 2152 is provided between two adjacent resonant rods 21, the two third coupling portions 2152 are arranged parallel and facing each other. When a third coupling portion 2152 is provided between only one of the two adjacent resonant rods 21, the extension path of the third coupling portion 2152 is parallel to the extension direction of the opposing resonant rod 21, that is, the third coupling portion 2152 and the opposing resonant rod 21 are arranged parallel and facing each other. This arrangement can help ensure and increase the facing area between the third coupling portion 2152 and the opposing resonant rod 21, thereby enhancing coupling.

[0105] For example, as shown in Figures 3, 4 and 5, in an example of the filter, the third coupling member 215 provided on the first resonant rod 21a and extending toward the second resonant rod 21b, the third coupling member 215 provided on the second resonant rod 21b and extending toward the first resonant rod 21a, the third coupling member 215 provided on the fifth resonant rod 21e and extending toward the fourth resonant rod 21d, the third coupling member 215 provided on the fifth resonant rod 21e and extending toward the sixth resonant rod 21f, the third coupling member 215 provided on the sixth resonant rod 21f and extending toward the seventh resonant rod 21g, the third coupling member 215 provided on the seventh resonant rod 21g and extending toward the sixth resonant rod 21f, the third coupling member 215 provided on the eighth resonant rod 21h and extending toward the seventh resonant rod 21g, and the third coupling member 215 provided on the ninth resonant rod 21i and extending toward the tenth resonant rod 21j are all the third coupling members 215 provided in this embodiment, that is, they include a third extension portion 2151 and a third coupling portion 2152.

[0106] By adopting the above solution, the third coupling member 215 can be connected to the corresponding resonant rod 21 via the third extension portion 2151 and extend toward the adjacent resonant rod 21 of the same resonant rod assembly 20. The third coupling portion 2152 is reliably supported by the third extension portion 2151, and the third coupling portion 2152 is brought close to the adjacent resonant rod 21 of the same resonant rod assembly 20. Furthermore, the third coupling portion 2152 is bent and connected to the end of the third extension portion 2151 away from the corresponding resonant rod 21, so as to be arranged opposite to and coupled with the adjacent resonant rod 21 of the same resonant rod assembly 20. This simplifies the structure of the third coupling member 215, reduces the design and processing difficulty of the third coupling member 215, and reduces the cost of the third coupling member 215 and the resonant rod 21 provided with the third coupling member 215. At the same time, since the third coupling member 215 can ensure and expand its facing area with the adjacent resonant rod 21 through the third coupling portion 2152, it is convenient for the adjacent resonant rods 21 of the same resonant rod assembly 20 to enhance coupling through the third coupling member 215, especially the third coupling portion 2152, thereby effectively ensuring and improving the performance of the filter.

[0107] Please refer to FIG. 3 , FIG. 4 , and FIG. 5 . In some embodiments of the present application, the third coupling member 215 is integrally connected to the free end 214 of the corresponding resonant rod 21 .

[0108] By adopting the above solution, the third coupling member 215 can be integrally connected and integrally formed with the corresponding resonant rod 21, making it easier to process the third coupling member 215 simultaneously with the corresponding resonant rod 21, thereby ensuring and improving the processing convenience of the third coupling member 215. Furthermore, by integrally connecting the third coupling member 215 to the free end 214 of the corresponding resonant rod 21, the third coupling member 215 can serve not only as a component for enhancing coupling, but also as a resonant disk of the resonant rod 21, thereby correspondingly lowering the resonant frequency of the corresponding resonant cavity. In other words, the existing resonant disk of the resonant rod 21 can also be integrally formed (e.g., by bending) to produce the required third coupling member 215 for enhancing coupling, thereby further facilitating the processing and forming of the third coupling member 215.

[0109] Please refer to Figures 2, 3, and 6. In some embodiments of the present application, the filter housing 10 is provided with a first coupling window 121. The first coupling window 121 is provided between adjacent resonant rod assemblies 20 for coupling at least one group of two resonant rods 21 opposite to each other along the first coupling window 121.

[0110] It should be noted that the filter housing 10 is provided with an isolation wall 12 between adjacent resonant rod assemblies 20 arranged in the same column or different columns. The isolation wall 12 isolates the resonant rods 21 that do not need to be coupled between adjacent resonant rod assemblies 20, shields irrelevant signals, and prevents signal interference, so as to form a complete and orderly signal transmission channel inside the filter. A first coupling window 121 can be opened on the isolation wall 12, and the two resonant rods 21 opposite to each other along the first coupling window 121 can establish a coupling relationship through the first coupling window 121. Moreover, when the opening range of the first coupling window 121 is large, multiple groups of resonant rods 21 can share the first coupling window 121 to establish their own coupling relationship, that is, among the multiple groups of resonant rods 21 sharing the first coupling window 121, the two relative resonant rods 21 of each group of resonant rods 21 establish a coupling relationship through the first coupling window 121.

[0111] Among them, the two resonant rods 21 coupled through the first coupling window 121 belong to different resonant rod assemblies 20, but the two resonant rods 21 may be adjacent or non-adjacent on the main signal transmission path. If the two resonant rods 21 are adjacent on the main signal transmission path, that is, they are two resonant rods 21 located at the ends of the resonant rod assembly 20 of the adjacent resonant rod assembly 20, then the coupling achieved by the two resonant rods 21 through the first coupling window 121 is a coupling relationship on the main signal transmission path, that is, the coupling relationship between the two resonant rods 21 is cascaded. If the two resonant rods 21 are not adjacent on the main signal transmission path, then the coupling achieved by the two resonant rods 21 through the first coupling window 121 is cross-coupling, that is, the coupling relationship between the two resonant rods 21 is non-cascaded.

[0112] For example, as shown in Figures 2, 3, and 6, in one example of a filter, a partition wall 12 is provided between the first resonant rod assembly 20a, the second resonant rod assembly 20b, and the third resonant rod assembly 20c. A first coupling window 121 is provided in the region of the partition wall 12 corresponding to the second resonant rod 21b and the fifth resonant rod 21e, allowing the second resonant rod 21b and the fifth resonant rod 21e to be opposite and cross-coupled through the first coupling window 121. Based on this, the second resonant rod 21b can transmit energy to the fifth resonant rod 21e via the third resonant rod 21c and the fourth resonant rod 21d in sequence, or directly to the fifth resonant rod 21e via the first coupling window 121. These two paths between the second resonant rod 21b and the fifth resonant rod 21e have a phase difference of 180 degrees at both the low and high ends of the passband, thereby forming a transmission zero at each of the low and high ends of the passband. Similarly, a first coupling window 121 is provided in the area between the corresponding first resonant rod 21a and the sixth resonant rod 21f of the isolation wall 12, so that the first resonant rod 21a and the sixth resonant rod 21f are relative and cross-coupled through the first coupling window 121; based on this, the first resonant rod 21a can transmit energy to the sixth resonant rod 21f via the second resonant rod 21b and the fifth resonant rod 21e in sequence, and can also transmit energy directly to the sixth resonant rod 21f through the first coupling window 121. These two paths between the first resonant rod 21a and the sixth resonant rod 21f have a phase difference of 180 degrees at the low end and the high end of the passband, thereby forming a transmission zero point at the low end and the high end of the passband. Although the first resonant rod 21a can transfer energy to the sixth resonant rod 21f via the second resonant rod 21b, the third resonant rod 21c, the fourth resonant rod 21d, and the fifth resonant rod 21e, and can also transfer energy directly to the sixth resonant rod 21f through the first coupling window 121, the shortest and longest paths between the first resonant rod 21a and the sixth resonant rod 21f do not satisfy the inverse condition, and thus a transmission zero cannot be generated. Furthermore, the first coupling window 121 between the first resonant rod 21a and the sixth resonant rod 21f allows for useful parasitic coupling between the first resonant rod 21a and the seventh resonant rod 21g. Consequently, the first resonant rod 21a can transfer energy to the seventh resonant rod 21g via the sixth resonant rod 21f, and can also transfer energy directly to the seventh resonant rod 21g through the first coupling window 121. These two paths between the first resonant rod 21a and the seventh resonant rod 21g have a phase difference of 180 degrees at the low end of the passband, thereby forming a transmission zero at the low end of the passband.

[0113] By adopting the above solution, the two resonant rods 21 of at least one group of adjacent resonant rod assemblies 20 can be relative and coupled via the first coupling window 121 provided in the partition wall 12, allowing energy to be transferred from the resonant rod 21 of one resonant rod assembly 20 to the resonant rod 21 of the other resonant rod assembly 20, thereby enabling energy to be transferred between adjacent resonant rod assemblies 20. This ensures that energy can be transmitted along a predetermined signal transmission path between different resonant rod assemblies 20, thereby guaranteeing filter performance. Furthermore, cross-coupling and useful parasitic coupling can be established based on the first coupling window 121 to ensure and enhance the filter's out-of-band suppression and filtering effects, enabling the filter to meet high selectivity requirements. Furthermore, due to the simple structure of the first coupling window 121, the two resonant rods 21 of different resonant rod assemblies 20 can be relative and coupled via the first coupling window 121. This further reduces the number of coupling rods and other components compared to existing filters, effectively simplifying the filter structure and facilitating a more compact, simpler, and lighter filter.

[0114] Referring to FIG. 2 , FIG. 3 , and FIG. 6 , in some embodiments of the present application, at least one first coupling window 121 and at least one second coupling window 122 are common coupling windows.

[0115] It should be noted that the isolation wall 12 may be provided with both a first coupling window 121 and a second coupling window 122 between two resonant rods 21 of at least one group of adjacent resonant rod assemblies 20. In this case, the first coupling window 121 and the second coupling window 122 may be provided overlapping, that is, the first coupling window 121 and the second coupling window 122 may be combined into a common coupling window.

[0116] For example, as shown in Figures 2 and 3, in one example of the filter, the isolation wall 12 is provided with a second coupling window 122 between the third resonant rod 21c and the fourth resonant rod 21d. The second coupling window 122 allows at least one of the first coupling member 211 and the second coupling member 212 to pass through, allowing the first coupling member 211 and the second coupling member 212 to be capacitively coupled at the second coupling window 122. At the same time, the second coupling window 122 can also serve as the first coupling window 121. In this case, the second coupling window 122 can enable inductive coupling between the third resonant rod 21c and the fourth resonant rod 21d disposed opposite each other. That is, capacitive coupling can be generated between the third resonant rod 21c and the fourth resonant rod 21d through the first coupling member 211 and the second coupling member 212 passing through the second coupling window 122, and inductive coupling can be generated through the second coupling window 122 which is a common coupling window. Based on this, a mixed coupling can be formed between the third resonant rod 21c and the fourth resonant rod 21d, and the coupling polarity finally presented between the third resonant rod 21c and the fourth resonant rod 21d can be determined according to the strength of the capacitive coupling and the inductive coupling.

[0117] By adopting the above solution, when both the first coupling window 121 and the second coupling window 122 are provided between two resonant rods 21 of at least one group of adjacent resonant rod assemblies 20, the first coupling window 121 and the second coupling window 122 can be arranged to overlap, so that the first coupling window 121 and the second coupling window 122 can be combined into a common coupling window. Based on this, while ensuring that the desired coupling relationship can be established between the two resonant rods 21, the number of coupling windows between the two resonant rods 21 can be effectively reduced, and the structural strength of the partition wall 12 can be effectively guaranteed, thereby improving the overall structural strength of the filter and reducing the difficulty of filter processing.

[0118] Of course, in other possible implementations, the first coupling window 121 and the second coupling window 122 may be provided separately, and this embodiment does not limit this.

[0119] Please refer to FIG. 2 and FIG. 3 . In some embodiments of the present application, the filter further includes a second coupling rib 30 . The second coupling rib 30 is connected between adjacent resonant rod assemblies 20 .

[0120] It should be noted that for two adjacent resonant rod assemblies 20 arranged in the same or different columns, the two resonant rods 21 at the ends of the two adjacent resonant rod assemblies 20 can be connected and coupled via a second coupling rib 30, facilitating signal transmission from one resonant rod assembly 20 to the other resonant rod assembly 20. The filter housing 10 has a corresponding fourth coupling window 124 on the partition wall 12 between the two resonant rod assemblies 20, through which the second coupling rib 30 passes. The second coupling rib 30 can be integrally connected to one of the resonant rods 21 connected thereto and separately connected to the other resonant rod 21 connected thereto; or, the second coupling rib 30 can be integrally connected to both resonant rods 21 connected thereto; or, the second coupling rib 30 can be separately connected to both resonant rods 21 connected thereto; this embodiment does not impose any restrictions on this. The extension direction of the second coupling rib 30 can be straight, curved, or the like, and this embodiment does not impose any restrictions on the extension path of the second coupling rib 30.

[0121] For example, as shown in Figures 2 and 3, in one example of the filter, the second resonant rod assembly 20b and the third resonant rod assembly 20c are arranged in columns, respectively, and are located in different columns. Between the second resonant rod assembly 20b and the third resonant rod assembly 20c, the eighth resonant rod 21h and the ninth resonant rod 21i are connected and coupled via a second coupling rib 30. Based on this, energy can be transmitted in sequence along the fourth resonant rod 21d, the fifth resonant rod 21e, the sixth resonant rod 21f, the seventh resonant rod 21g, the eighth resonant rod 21h, the ninth resonant rod 21i, and the tenth resonant rod 21j, thereby promoting the formation of a primary signal transmission path.

[0122] By adopting the above solution, adjacent resonant rod assemblies 20 are located between the two resonant rods 21 at the ends and can be connected via the second coupling ribs 30 passing through the fourth coupling window 124, so that energy can be transmitted from the resonant rod 21 at one end of one resonant rod assembly 20 to the resonant rod 21 on one side of the other resonant rod assembly 20, allowing energy to be transmitted between adjacent resonant rod assemblies 20. Based on this, it is ensured that energy can be transmitted sequentially according to the preset signal transmission path, passing through each resonant rod 21 of each resonant rod assembly 20 in sequence, thereby ensuring the performance of the filter.

[0123] Referring to FIG. 2 , FIG. 3 , and FIG. 6 , in some embodiments of the present application, at least one first coupling window 121 and at least one fourth coupling window 124 are common coupling windows.

[0124] It should be noted that the isolation wall 12 may be provided with both the first coupling window 121 and the fourth coupling window 124 between two resonant rods 21 at the ends of at least one set of adjacent resonant rod assemblies 20. In this case, the first coupling window 121 and the fourth coupling window 124 may be provided overlapping, that is, the first coupling window 121 and the fourth coupling window 124 may be combined into a common coupling window.

[0125] For example, as shown in Figures 2 and 3, in one example of a filter, the isolation wall 12 has a fourth coupling window 124 between the eighth resonant rod 21h and the ninth resonant rod 21i. The fourth coupling window 124 allows the second coupling rib 30 to pass through, allowing the second coupling rib 30 to connect the eighth resonant rod 21h and the ninth resonant rod 21i, and coupling the eighth resonant rod 21h and the ninth resonant rod 21i via the second coupling rib 30. Simultaneously, the fourth coupling window 124 can also function as the first coupling window 121. In this case, the fourth coupling window 124 allows direct coupling between the eighth resonant rod 21h and the ninth resonant rod 21i, which are disposed opposite each other. In other words, the eighth resonant rod 21h and the ninth resonant rod 21i can be coupled via the second coupling rib 30 passing through the fourth coupling window 124, or directly coupled via the fourth coupling window 124, which serves as a shared coupling window, thereby enhancing coupling.

[0126] By adopting the above solution, when at least one group of adjacent resonant rod assemblies 20 is located between two resonant rods 21 at the end, and both the first coupling window 121 and the fourth coupling window 124 are provided, the first coupling window 121 and the fourth coupling window 124 can be arranged to overlap, so that the first coupling window 121 and the fourth coupling window 124 can be combined into a common coupling window. Based on this, while ensuring that the desired coupling relationship can be established between the two resonant rods 21 and the desired coupling strength is obtained, the number of coupling windows between the two resonant rods 21 can be effectively reduced, and the structural strength of the partition wall 12 can be effectively guaranteed, thereby improving the overall structural strength of the filter and reducing the difficulty of filter processing.

[0127] Of course, in other possible implementations, the first coupling window 121 and the fourth coupling window 124 may be provided separately, and this embodiment does not limit this.

[0128] Please refer to Figures 2 and 3. In some embodiments of the present application, the filter also includes a third coupling rib 40, which is connected between two resonant rods 21 of adjacent resonant rod assemblies 20 to cross-couple the two resonant rods 21 of adjacent resonant rod assemblies 20.

[0129] It should be noted that the third coupling rib 40 is connected between the two resonant rods 21 of the adjacent resonant rod assembly 20, so that the two resonant rods 21 form a cross coupling. The "connection" can be that the third coupling rib 40 is directly connected to the resonant rod 21, or the third coupling rib 40 is indirectly connected to the resonant rod 21 through a structure such as the first coupling rib 22. The third coupling rib 40 can be integrally connected to one of the resonant rods 21 connected thereto and separately connected to the other resonant rod 21 connected thereto; or, the third coupling rib 40 can be integrally connected to both resonant rods 21 connected thereto; or, the third coupling rib 40 can be separately connected to both resonant rods 21 connected thereto; this embodiment does not impose any restrictions on this. The extension direction of the third coupling rib 40 can be straight-line or bent, etc., and this embodiment does not impose any restrictions on this.

[0130] The isolation wall 12 of the filter housing 10 may be provided with a third coupling window 123 between the two resonant rods 21 connected by the third coupling rib 40 . The third coupling window 123 may be used for the third coupling rib 40 to pass through.

[0131] It should also be noted that the two resonant rods 21 forming the cross-coupling are not adjacent to each other on the main signal transmission path, that is, the two cross-coupled resonant rods 21 of adjacent resonant rod assemblies 20 are not adjacent to each other on the main signal transmission path, that is, the coupling relationship between the two resonant rods 21 is non-cascade. For example, if the third coupling rib 40 is connected to the two resonant rods 21 at the ends of the adjacent resonant rod assemblies 20, the third coupling rib 40 cannot cross-couple the two resonant rods 21 connected thereto, and this is not allowed.

[0132] Of course, the two resonant rods 21 forming the cross coupling may be arranged relative to each other or not, and this embodiment does not impose any limitation on this.

[0133] For example, as shown in Figures 2 and 3, in one example of a filter, the isolation wall 12 defines a third coupling window 123, located between the eighth resonant rod 21h and the tenth resonant rod 21j. A third coupling rib 40 is provided between the eighth resonant rod 21h and the tenth resonant rod 21j. The third coupling rib 40 passes through the third coupling window 123 and connects the eighth resonant rod 21h and the tenth resonant rod 21j, thereby forming a cross-coupling between the eighth resonant rod 21h and the tenth resonant rod 21j. Based on this, the eighth resonant rod 21h can transfer energy to the tenth resonant rod 21j via the ninth resonant rod 21i, or directly to the tenth resonant rod 21j via the third coupling rib 40. These two paths between the eighth resonant rod 21h and the tenth resonant rod 21j have a phase difference of 180 degrees at the high end of the passband, thereby forming a transmission zero at the high end of the passband.

[0134] By adopting the above solution, the two resonant rods 21 of adjacent resonant rod assemblies 20 can be connected and cross-coupled via the third coupling rib 40. This allows the two resonant rods 21 connected by the third coupling rib 40 to have a main signal transmission path that transmits energy sequentially through other resonant rods 21, as well as a direct signal transmission path that transmits energy directly through the third coupling rib 40. The two transmission paths will have a 180-degree phase difference in the filter passband, thereby forming a transmission zero in the filter passband. This allows the filter to form a multi-zero solution by combining the formed transmission zero with other zeros, effectively enhancing the filter's out-of-band suppression and filtering effects, thereby enabling the filter to meet high selectivity requirements. Furthermore, due to the simple structure of the third coupling rib 40, the two resonant rods 21 of adjacent resonant rod assemblies 20 can be connected and cross-coupled via the third coupling rib 40. Therefore, compared to existing filters, components such as coupling rods can be further saved, thereby effectively simplifying the filter structure and making the filter more concise, lighter, and smaller.

[0135] Referring to FIG. 2 , FIG. 3 , and FIG. 6 , in some embodiments of the present application, at least one first coupling window 121 and at least one third coupling window 123 are common coupling windows.

[0136] It should be noted that the isolation wall 12 may be provided with both the first coupling window 121 and the third coupling window 123 between two resonant rods 21 of at least one group of adjacent resonant rod assemblies 20. In this case, the first coupling window 121 and the third coupling window 123 may be provided overlapping, that is, the first coupling window 121 and the third coupling window 123 may be combined into a common coupling window.

[0137] For example, as shown in Figures 2 and 3, in one example of a filter, the isolation wall 12 has a third coupling window 123 between the eighth resonant rod 21h and the tenth resonant rod 21j. The third coupling rib 40 can be inserted through the third coupling window 123, allowing the third coupling rib 40 to connect the eighth resonant rod 21h and the tenth resonant rod 21j, and cross-couple the eighth resonant rod 21h and the tenth resonant rod 21j via the third coupling rib 40. Simultaneously, the third coupling window 123 can also function as the first coupling window 121. In this case, the third coupling window 123 can directly couple the eighth resonant rod 21h and the tenth resonant rod 21j, which are arranged opposite each other. In other words, the eighth resonant rod 21h and the tenth resonant rod 21j can be cross-coupled via the third coupling rib 40 inserted through the third coupling window 123, or directly coupled via the third coupling window 123, which serves as a shared coupling window, thereby enhancing coupling.

[0138] By adopting the above solution, when both the first coupling window 121 and the third coupling window 123 are provided between two resonant rods 21 of at least one group of adjacent resonant rod assemblies 20, the first coupling window 121 and the third coupling window 123 can be arranged to overlap, so that the first coupling window 121 and the third coupling window 123 can be combined into a common coupling window. Based on this, while ensuring that the desired cross-coupling relationship can be established between the two resonant rods 21 and the desired coupling strength is obtained, the number of coupling windows between the two resonant rods 21 can be effectively reduced, and the structural strength of the partition wall 12 can be effectively guaranteed, thereby improving the overall structural strength of the filter and reducing the difficulty of filter processing.

[0139] Of course, in other possible implementations, the first coupling window 121 and the third coupling window 123 may be provided separately, and this embodiment does not limit this.

[0140] Please refer to Figures 2 and 3. In some embodiments of the present application, the filter also includes a fourth coupling rib 50 connected between adjacent resonant rod assemblies 20. The fourth coupling rib 50 has a first end 51 and a second end 52 relative to each other. The first end 51 is connected to the resonant rod 21 of one of the resonant rod assemblies 20, and the second end 52 is connected between two adjacent resonant rods 21 of the other resonant rod assembly 20.

[0141] It should be noted that the fourth coupling rib 50 is connected to the resonant rod 21. The "connection" here can be that the fourth coupling rib 50 is directly connected to the resonant rod 21, or the fourth coupling rib 50 is indirectly connected to the resonant rod 21 through a structure such as the first coupling rib 22. In particular, when the second end 52 is connected between two adjacent resonant rods 21 of another resonant rod assembly 20, the second end 52 can be indirectly connected to the two resonant rods 21 through a structure such as the first coupling rib 22.

[0142] It should also be noted that the second end 52 is connected between two adjacent resonant rods 21 of another resonant rod assembly 20. The second end 52 can be located in the middle of the two resonant rods 21. The second end 52 can also be relatively close to one of the resonant rods 21 and relatively far away from the other resonant rod 21. For example, as shown in Figures 2 and 3, the second end 52 is connected between the seventh resonant rod 21g and the eighth resonant rod 21h, and the second end 52 is located relatively close to the eighth resonant rod 21h.

[0143] It should also be noted that one end of the fourth coupling rib 50 is a first end 51, which is connected to the resonant rod 21 of one of the resonant rod assemblies 20, so that the resonant rod 21 can transmit energy via the fourth coupling rib 50. The other end of the fourth coupling rib 50 is a second end 52, which is connected between two adjacent resonant rods 21 of another resonant rod assembly 20, and specifically can be connected to the first coupling rib 22 between two adjacent resonant rods 21 of another resonant rod assembly 20. Based on this, the two resonant rods 21 connected to the second end 52 can both transmit energy via the fourth coupling rib 50. Thus, the resonant rod 21 connected to the first end 51 can transmit energy to the two resonant rods 21 connected to the second end 52 via the fourth coupling rib 50, or the two resonant rods 21 connected to the second end 52 can both transmit energy to the resonant rod 21 connected to the first end 51 via the fourth coupling rib 50. That is, both resonant rods 21 connected to the second end 52 can generate cross-coupling via the fourth coupling rib 50 and the resonant rod 21 connected to the first end 51. Thus, two transmission paths can exist between the three resonant rods 21 connected to the fourth coupling rib 50, and these two transmission paths can have a phase difference of 180 degrees in the filter passband, thereby forming a transmission zero point in the filter passband. This allows the filter to form a multi-zero solution through the formed transmission zero point combined with other zero points, effectively enhancing the filter's out-of-band suppression and filtering effects.

[0144] The fourth coupling rib 50 may be integrally connected to the structure it is connected to or separately connected to it, and this embodiment does not limit this. The fourth coupling rib 50 may extend in a straight line or in a curved shape, and this embodiment does not limit this.

[0145] For example, as shown in Figures 2 and 3, in one embodiment of the filter, a fourth coupling rib 50 is provided. The first end 51 of the fourth coupling rib 50 is connected to the tenth resonant rod 21j, and the second end 52 of the fourth coupling rib 50 is connected to the first coupling rib 22 between the seventh resonant rod 21g and the eighth resonant rod 21h. Consequently, the eighth resonant rod 21h can be cross-coupled with the tenth resonant rod 21j via the fourth coupling rib 50, and the seventh resonant rod 21g can be cross-coupled with the tenth resonant rod 21j via the fourth coupling rib 50. In this way, the seventh resonant rod 21g can transfer energy to the tenth resonant rod 21j sequentially via the eighth resonant rod 21h and the fourth coupling rib 50, or directly to the tenth resonant rod 21j via the fourth coupling rib 50. Two transmission paths exist between the seventh resonant rod 21g, the eighth resonant rod 21h, and the tenth resonant rod 21j. These two transmission paths have a phase difference of 180 degrees at the high end of the filter passband, thereby forming a transmission zero at the high end of the filter passband.

[0146] By adopting the above solution, the resonant rod 21 of one of the adjacent resonant rod assemblies 20 can be connected via the first end 51 of the fourth coupling rib 50, and the two adjacent resonant rods 21 of the other resonant rod assembly 20 can be connected via the second end 52 of the fourth coupling rib 50, so that there are two signal transmission paths between the resonant rod 21 connected to the first end 51 and the two resonant rods 21 connected to the second end 52. The two transmission paths will have a phase difference of 180 degrees in the filter passband, thereby forming a transmission zero point in the filter passband, so that the filter can form a multi-zero point solution through the formed transmission zero point combined with other zero points, thereby effectively enhancing the filter's out-of-band suppression effect and filtering effect, thereby enabling the filter to meet high selectivity requirements. Moreover, since the fourth coupling rib 50 has a simple structure, the resonant rod 21 of one resonant rod assembly 20 can be cross-coupled with the two adjacent resonant rods 21 of the other resonant rod assembly 20 directly via the fourth coupling rib 50. Therefore, compared with the existing filter, it can further save coupling rods and other components, and can save the number of coupling ribs set compared with the scheme of "promoting cross-coupling between one resonant rod 21 and the other two resonant rods 21 via two third coupling ribs 40", thereby effectively simplifying the structure of the filter, which can help the filter to be smaller, simpler and lighter.

[0147] Please refer to FIG. 2 and FIG. 3 . In some embodiments of the present application, at least one third coupling rib 40 and at least one fourth coupling rib 50 are common coupling ribs.

[0148] It should be noted that at least one group of adjacent resonant rod assemblies 20 is provided with both at least one third coupling rib 40 and at least one fourth coupling rib 50, and the two resonant rods 21 connected by at least one third coupling rib 40 are two of the three resonant rods 21 connected by at least one fourth coupling rib 50. In this case, the third coupling rib 40 and the fourth coupling rib 50 can be arranged to overlap, that is, the third coupling rib 40 and the fourth coupling rib 50 are combined into a common coupling rib.

[0149] For example, as shown in Figures 2 and 3, in one example of the filter, the eighth resonant rod 21h and the tenth resonant rod 21j are connected via a third coupling rib 40 to form cross-coupling, and the seventh resonant rod 21g, the eighth resonant rod 21h, and the tenth resonant rod 21j are connected via a fourth coupling rib 50. Because the objects connected to the third coupling rib 40 and the objects connected to the fourth coupling rib 50 both include the eighth resonant rod 21h and the tenth resonant rod 21j, the third coupling rib 40 and the fourth coupling rib 50 can be arranged to overlap, so that the third coupling rib 40 and the fourth coupling rib 50 can be combined into a common coupling rib. In this case, the seventh resonant rod 21g can be cross-coupled with the tenth resonant rod 21j via the common coupling rib, and the eighth resonant rod 21h can be cross-coupled with the tenth resonant rod 21j via the common coupling rib. Combined with the main signal transmission paths transmitted sequentially by the seventh resonant rod 21g, the eighth resonant rod 21h, the ninth resonant rod 21i, and the tenth resonant rod 21j, the seventh resonant rod 21g, the eighth resonant rod 21h, the ninth resonant rod 21i, and the tenth resonant rod 21j can form a nested structure. Specifically, the seventh resonant rod 21g can transfer energy to the tenth resonant rod 21j via the eighth resonant rod 21h and the common coupling rib, or can directly transfer energy to the tenth resonant rod 21j via the common coupling rib. This results in a 180-degree phase difference between the two transmission paths between the seventh resonant rod 21g and the tenth resonant rod 21j at the high end of the filter passband, thereby forming a transmission zero at the high end of the filter passband. Similarly, the eighth resonant rod 21h can transfer energy to the tenth resonant rod 21j via the ninth resonant rod 21i, or directly to the tenth resonant rod 21j via a shared coupling rib. This results in a 180-degree phase difference between the two paths between the eighth and tenth resonant rods 21h, 21j, at the high end of the passband, thereby forming a transmission zero at the high end of the passband. Furthermore, although the seventh resonant rod 21g can transfer energy to the tenth resonant rod 21j via the eighth and ninth resonant rods 21h, 21i, and parasitically couple to the tenth resonant rod 21j via a shared coupling rib, the shortest and longest paths between the seventh and tenth resonant rods 21g, 21j, do not satisfy the inverse condition, and thus cannot generate a transmission zero. Therefore, the nested structure formed by the seventh resonant rod 21g, the eighth resonant rod 21h, the ninth resonant rod 21i, and the tenth resonant rod 21j forms two transmission zeros at the high end of the passband.

[0150] By adopting the above solution, a third coupling rib 40 and a fourth coupling rib 50 are provided between adjacent resonant rod assemblies 20. If the objects connected to the third coupling rib 40 and the objects connected to the fourth coupling rib 50 are partially the same, the third coupling rib 40 and the fourth coupling rib 50 can be arranged overlapping, so that the third coupling rib 40 and the fourth coupling rib 50 are combined into a single shared coupling rib. Based on this, while ensuring the realization of multiple zero points, the number of coupling ribs provided between adjacent resonant rod assemblies 20 can be effectively reduced, effectively simplifying the filter structure and effectively saving the space required for the filter's internal structure, thereby making the filter more concise and lightweight.

[0151] Of course, in other possible implementations, the third coupling rib 40 and the fourth coupling rib 50 may be provided separately, and this embodiment does not limit this.

[0152] Please refer to FIG. 2 and FIG. 3 . In some embodiments of the present application, the third coupling rib 40 is arranged to extend in a curved shape.

[0153] By adopting the above solution, the third coupling rib 40 can be extended in a curved shape to extend the extension path of the third coupling rib 40 accordingly. Based on this, the signal and energy that can be loaded by the third coupling rib 40 can be increased accordingly, the signal strength can be enhanced accordingly, and the signal stability can be improved accordingly.

[0154] 2 , 3 , and 5 , in some embodiments of the present application, at least one resonant rod 21 connected to the third coupling rib 40 is provided with a mounting groove 216 for positioning the corresponding end of the third coupling rib 40 therein.

[0155] It should be noted that at least one of the resonant rods 21 connected to the third coupling rib 40 is provided with a mounting groove 216, and the corresponding end of the third coupling rib 40 can be positionally mounted in the mounting groove 216. For example, as shown in Figures 2, 3, and 5, in one example of the filter, the tenth resonant rod 21j is provided with a mounting groove 216, and the end of the third coupling rib 40 adjacent to the tenth resonant rod 21j is positionally mounted in the mounting groove 216.

[0156] By adopting the above-mentioned scheme, at least one resonant rod 21 connected to the third coupling rib 40 can be installed to limit and position the end of the third coupling rib 40 through the installation groove 216. Based on this, the installation convenience of the third coupling rib 40 can be guaranteed and improved, and the stability and reliability of the third coupling rib 40 after installation can be guaranteed and improved. It can also help to ensure and enhance the coupling reliability and coupling strength between the third coupling rib 40 and the resonant rod 21 provided with the installation groove 216.

[0157] Please refer to Figures 2, 3 and 5. In some embodiments of the present application, at least one resonant rod 21 connected to the third coupling rib 40 is provided with a support portion 217 for supporting a corresponding end portion of the third coupling rib 40.

[0158] It should be noted that, among the resonant rods 21 connected to the third coupling rib 40, at least one resonant rod 21 is provided with a support portion 217, and the corresponding end portion of the third coupling rib 40 can be mounted on the support portion 217, so that the corresponding end portion of the third coupling rib 40 is supported by the support portion 217. For example, as shown in Figures 2, 3, and 5, in one example of the filter, the eighth resonant rod 21h is provided with a support portion 217, and the end portion of the third coupling rib 40 adjacent to the eighth resonant rod 21h is mounted on the support portion 217, so that the end portion of the third coupling rib 40 adjacent to the eighth resonant rod 21h is supported by the support portion 217.

[0159] By adopting the above solution, at least one resonant rod 21 connected to the third coupling rib 40 can support and fix the end of the third coupling rib 40 through the support portion 217. Based on this, the installation convenience of the third coupling rib 40 can be guaranteed and improved, and the stability and reliability of the third coupling rib 40 after installation can be guaranteed and improved. It can also help to ensure the reliability of the coupling connection between the third coupling rib 40 and the resonant rod 21 provided with the support portion 217.

[0160] Referring to Figures 1, 2, and 3, in some embodiments of the present application, the filter includes two signal transmission terminals 60 mounted on the filter housing 10, wherein one signal transmission terminal 60 is coupled to the resonant rod 21 of one resonant rod assembly 20, and the other signal transmission terminal 60 is coupled to the resonant rod 21 of the other resonant rod assembly 20. One of the signal transmission terminals 60 is used for inputting signals and energy, and the other signal transmission terminal 60 is used for outputting signals and energy.

[0161] By adopting the above scheme, the filter can input the signal and energy to the resonant rod 21 connected to it through one of the signal transmission ends 60, and then transmit the energy in sequence through the structures such as each resonant rod 21 of each resonant rod assembly 20 and gradually filter out and suppress the clutter signal and interference signal, and finally output the signal and energy through another signal transmission end 60 to complete the filtering operation of the filter.

[0162] 1 , 2 , and 3 , in some embodiments of the present application, at least one signal transmission end 60 is provided with an inner conductor 61. At least one resonant rod assembly 20 is provided with a coupling hole 218 corresponding to the inner conductor 61. The inner conductor 61 passes through the coupling hole 218 and is coupled to the at least one resonant rod 21.

[0163] It should be noted that at least one of the two signal transmission ends 60 is provided with an inner conductor 61 , and the inner conductor 61 may be in the shape of, but not limited to, a rod, a needle, a cone, or the like.

[0164] Correspondingly, the resonant rod assembly 20 coupled to the inner conductor 61 may be provided with a coupling hole 218, which is provided corresponding to and aligned with the inner conductor 61. The coupling hole 218 may be provided on the resonant rod 21 of the resonant rod assembly 20, on the first coupling rib 22 of the resonant rod assembly 20, or on other components of the resonant rod assembly 20, and this embodiment does not impose any limitation thereto.

[0165] The end of the inner conductor 61 is inserted into the corresponding coupling hole 218. Based on this, the signal transmission end 60 can be directly coupled to at least one resonant rod 21 near the coupling hole 218 through the inner conductor 61. For example, when the coupling hole 218 is provided on the resonant rod 21 of the resonant rod assembly 20, the inner conductor 61 inserted through the coupling hole 218 can be coupled to the resonant rod 21 provided with the coupling hole 218. For another example, when the coupling hole 218 is provided on the first coupling rib 22 of the resonant rod assembly 20, the inner conductor 61 inserted through the coupling hole 218 can be coupled to the two resonant rods 21 located on both sides of the first coupling rib 22.

[0166] Because the inner conductor 61 and the coupling hole 218 are easily assembled and have a relatively small coupling path, the coupling strength between the signal transmission end 60 and the corresponding resonant rod 21 can be effectively enhanced, effectively expanding the filter's bandwidth. The coupling hole 218 can be either a through hole or a blind hole, specifically designed to meet the required coupling strength. The length of the portion of the inner conductor 61 that penetrates the coupling hole 218 can be adjusted based on the required coupling strength.

[0167] For example, as shown in Figures 2 and 3, in one example of the filter, one signal transmission end 60 is positioned in alignment with the first resonant rod 21a, the first resonant rod 21a is provided with a coupling hole 218 corresponding to the signal transmission end 60, and the inner conductor 61 of the signal transmission end 60 is passed through the coupling hole 218 of the first resonant rod 21a, so that the signal transmission end 60 is coupled to the first resonant rod 21a. Similarly, another signal transmission end 60 is positioned in alignment with the tenth resonant rod 21j, the tenth resonant rod 21j is provided with a coupling hole 218 corresponding to the signal transmission end 60, and the inner conductor 61 of the signal transmission end 60 is passed through the coupling hole 218 of the tenth resonant rod 21j, so that the signal transmission end 60 is coupled to the tenth resonant rod 21j.

[0168] By adopting the above-mentioned scheme, by allowing the inner conductor 61 of at least one signal transmission end 60 to pass through the coupling hole 218 of the corresponding resonant rod assembly 20, the signal transmission end 60 can be directly coupled and connected with at least one resonant rod 21 of the corresponding resonant rod assembly 20 through the inner conductor 61. The assembly is simple, and the coupling path between the signal transmission end 60 and the corresponding resonant rod 21 is small, thereby effectively reducing the signal delay value between the signal transmission end 60 and the corresponding resonant rod 21, effectively enhancing the coupling strength between the signal transmission end 60 and the corresponding resonant rod 21, effectively expanding the bandwidth of the filter, and effectively improving the performance indicators of the filter.

[0169] Moreover, since the signal transmission end 60 can be directly passed through the coupling hole 218 through the inner conductor 61 to achieve direct coupling connection with the resonance rod 21 of the corresponding resonance rod assembly 20, the tap structure required for the resonance rod 21 can be reduced accordingly, thereby reducing the number of components and the type of materials, simplifying the structure of the filter, and facilitating the simplification and lightweighting of the filter.

[0170] Moreover, since the signal transmission end 60 can be directly passed through the coupling hole 218 through the inner conductor 61 to achieve direct coupling connection with the resonant rod 21 of the corresponding resonant rod assembly 20, the solder joint between the signal transmission end 60 and the corresponding resonant rod assembly 20 can also be omitted, thereby effectively reducing the risk of failure of the coupling relationship between the signal transmission end 60 and the corresponding resonant rod assembly 20 due to easy falling off of the solder joint, thereby effectively ensuring and improving the stability and reliability of the coupling relationship between the signal transmission end 60 and the corresponding resonant rod assembly 20, and effectively ensuring and improving the performance and service life of the filter.

[0171] Please refer to Figures 1, 2, and 3. In some embodiments of the present application, the filter housing 10 includes a first plate 13 for mounting the resonant rod assembly 20, a second plate 14 arranged opposite to the first plate 13, and a shell body 15 connected between the second plate 14 and the first plate 13. The second plate 14, the shell body 15, and the first plate 13 together enclose a closed inner cavity 11.

[0172] It should be noted that the plate on one side of the filter housing 10 is the first plate 13, and the first plate 13 can be used to mount the resonant rod assembly 20. The resonant rod assembly 20 can be connected to the first plate 13 via the connection end 213 of the resonant rod 21, or can be connected to the first plate 13 via the first coupling rib 22. Optionally, the resonant rod assembly 20 can be connected to the first plate 13 by, but not limited to, welding, riveting, crimping, screw fastening, threaded connection, clamping, etc., which is not limited in this embodiment.

[0173] The plate on the side of the filter housing 10 opposite the first plate 13 is the second plate 14. In actual application scenarios, the filter can be placed with the second plate 14 facing upward, or with the second plate 14 facing downward, left, right, forward, or backward, and this embodiment does not impose any restrictions on this.

[0174] The component of the filter housing 10 connected between the second plate 14 and the first plate 13 is the housing body 15, which extends from the first plate 13 to the second plate 14. The housing body 15 can be, but is not limited to, a polygonal cylindrical shape, a circular cylindrical shape, or any other irregular cylindrical shape. For example, as shown in Figures 1 and 3, the housing body 15 is a rectangular cylindrical shape. The housing body 15 includes a plurality of side walls 151 connected end to end. Adjacent side walls 151 can be connected integrally or separately.

[0175] Based on this, the filter housing 10 can be enclosed by the second plate 14 , the housing body 15 and the first plate 13 to form a closed inner cavity 11 .

[0176] As shown in FIG. 1 , FIG. 2 , and FIG. 3 , in a possible embodiment, the shell body 15 is integrally connected to the second plate 14 , and the shell body 15 is separately connected to the first plate 13 .

[0177] It should be noted that the second plate 14 can be a single-layer or multi-layer plate, and the housing body 15 can be integrally connected to the second plate 14 by being integrally formed with at least one layer of the second plate 14. The first plate 13 is first formed independently of the housing body 15 and then separately connected to the housing body 15. The filter housing 10 is assembled with the housing body 15 and the second plate 14 to form the enclosed inner cavity 11. This embodiment does not limit the specific separate connection method used between the housing body 15 and the first plate 13.

[0178] The shell body 15 is metal, the first plate 13 is metal, and the second plate 14 can be a single-layer or multi-layered plate. At least the layer of the second plate 14 that contributes to enclosing the inner cavity 11 is metal. Because the shell body 15 and at least one layer of the second plate 14 are integrally formed, the shell body 15 and the layers of the second plate 14 integrally formed therewith are made of the same material. Because the shell body 15 is separately connected to the first plate 13, the material of the shell body 15 and the material of the first plate 13 can be the same or different.

[0179] By adopting the above solution, the shell body 15 and at least one layer of the second plate 14 can be integrally formed, and the first plate 13 can be independently formed relative to the shell body 15. The first plate 13 and the shell body 15 are then separately connected to form the filter housing 10 and a closed inner cavity 11. Based on this, the assembly process between the second plate 14 and the shell body 15 can be effectively saved, thereby effectively reducing the number of steps, effectively ensuring and improving the processing convenience of the second plate 14 and the shell body 15, as well as the processing convenience of the first plate 13, thereby effectively improving the processing efficiency of the filter housing 10. Furthermore, since the first plate 13 is a plate-like structure, the resonant rod assembly 20 is installed on the first plate 13. By adopting a split connection scheme between the first plate 13 and the shell body 15, during the assembly process of the filter, the resonant rod assembly 20 can be first installed on the first plate 13, and then the first plate 13 and the shell body 15 can be split and connected. The assembly of the filter is convenient and quick. Moreover, during the installation process, the resonant rod assembly 20 will not be restricted by the shape of the shell body 15, nor will it be interfered with by structures such as the isolation wall 12 located inside the shell body 15. This makes it easier to install the resonant rod assembly 20, and can effectively improve the installation efficiency of the resonant rod assembly 20 and the assembly efficiency of the filter.

[0180] In another possible embodiment, the shell body 15 is separately connected to the second plate 14 , and the shell body 15 is separately connected to the first plate 13 .

[0181] It should be noted that the second plate 14, the housing body 15, and the first plate 13 are first formed independently and then separately connected in sequence to assemble the filter housing 10 and form the enclosed inner cavity 11. This embodiment does not impose any exclusive restrictions on the specific separate connection method used between the housing body 15 and the first plate 13, or the specific separate connection method used between the housing body 15 and the second plate 14.

[0182] The shell body 15 is metal, the first plate 13 is metal, and the second plate 14 can be a single-layer or multi-layer plate. At least the layer of the second plate 14 that helps to seal the inner cavity 11 is metal. Because the second plate 14, the shell body 15, and the first plate 13 are connected in sequence, the materials of the second plate 14, the shell body 15, and the first plate 13 can be the same or different.

[0183] By adopting the above solution, the second plate 14, the shell body 15, and the first plate 13 can be independently formed first, and then separately connected in sequence to assemble the filter housing 10, forming a closed inner cavity 11. Based on this, the process of machining the entire filter housing 10 to form the corresponding features can be greatly eliminated, thereby effectively reducing the number of steps and effectively reducing the difficulty of machining the second plate 14, the shell body 15, and the first plate 13. It can effectively ensure and improve the processing convenience of the second plate 14, the shell body 15, and the first plate 13, and effectively improve the processing efficiency of the filter housing 10. Furthermore, since the first plate 13 is a plate-like structure, the resonant rod assembly 20 is installed on the first plate 13. By adopting a split connection scheme between the first plate 13 and the shell body 15, during the assembly process of the filter, the resonant rod assembly 20 can be first installed on the first plate 13, and then the first plate 13 and the shell body 15 can be split and connected. The assembly of the filter is convenient and quick. Moreover, during the installation process, the resonant rod assembly 20 will not be restricted by the shape of the shell body 15, nor will it be interfered with by structures such as the isolation wall 12 located inside the shell body 15. This makes it easier to install the resonant rod 21, and can effectively improve the installation efficiency of the resonant rod assembly 20 and the assembly efficiency of the filter.

[0184] In another possible embodiment, the shell body 15 is separately connected to the second plate 14 , and the shell body 15 is integrally connected to the first plate 13 .

[0185] It should be noted that the housing body 15 can be integrally connected to the first plate 13 by being integrally formed with the first plate 13. The second plate 14 is first formed independently of the housing body 15 and then separately connected to the housing body 15 to form the filter housing 10 when assembled with the housing body 15 and the first plate 13, thereby forming a closed inner cavity 11. This embodiment does not limit the specific separate connection method used between the housing body 15 and the first plate 13.

[0186] The shell body 15 is metal, the first plate 13 is metal, and the second plate 14 can be a single-layer or multi-layer plate. At least the layer of the second plate 14 that helps to enclose the inner cavity 11 is metal. Because the shell body 15 and the first plate 13 are integrally formed, the material of the shell body 15 is the same as that of the first plate 13. Because the shell body 15 and the second plate 14 are connected separately, the material of the shell body 15 and the material of the second plate 14 can be the same or different.

[0187] By adopting the above solution, the housing body 15 and the first plate 13 can be integrally formed, and the second plate 14 can be independently formed relative to the housing body 15. The second plate 14 and the housing body 15 can then be separately connected to form the filter housing 10, thereby forming a closed inner cavity 11. This effectively reduces the number of assembly steps between the housing body 15 and the first plate 13, thereby effectively ensuring and improving the processing convenience of the housing body 15 and the first plate 13, as well as the processing convenience of the second plate 14. Furthermore, when the second plate 14 is a multi-layer board, by first separately forming the second plate 14, it is easier to process the second plate 14 to form an inner layer near the housing body 15, especially to form a stress-deformable tuning portion within the inner layer of the second plate 14. By then separately connecting the second plate 14 to the housing body 15, the risk of damage to the tuning portion during processing and assembly can be effectively reduced, thereby improving the processing convenience and processing quality of the second plate 14.

[0188] Please refer to FIG. 2 , FIG. 3 , and FIG. 6 . In some embodiments of the present application, the filter housing 10 is provided with a partition wall 12 between two adjacent resonant rod assemblies 20 . The partition wall 12 is separately connected to the first plate 13 .

[0189] It should be noted that the filter housing 10 is provided with a partition wall 12 between adjacent resonant rod assemblies 20. The partition wall 12 isolates the resonant rods 21 that do not need to be coupled between adjacent resonant rod assemblies 20, shielding irrelevant signals and preventing signal interference, thereby forming a complete and orderly signal transmission channel inside the filter.

[0190] The isolation wall 12 can be formed independently of the first plate 13 and then separately connected to the first plate 13, thereby achieving stability and firmness relative to the first plate 13 and reliably performing the isolation function. This embodiment does not limit the specific separate connection method used between the isolation wall 12 and the first plate 13.

[0191] By adopting the above-mentioned scheme, when the resonant rod assembly 20 is installed on the first plate 13, by making the isolation wall 12 split and connected to the first plate 13, during the assembly process of the filter, the resonant rod assembly 20 can be first installed on the first plate 13, and then the isolation wall 12 can be split and connected to the first plate 13 to ensure that the resonant rod assembly 20 will not be interfered with or obstructed by the isolation wall 12 during the installation process, thereby facilitating the installation of the resonant rod 21, which can help improve the installation efficiency of the resonant rod assembly 20 and the assembly efficiency of the filter.

[0192] Please refer to FIG. 2 , FIG. 3 , and FIG. 6 . In some embodiments of the present application, the isolation wall 12 is integrally connected to the shell body 15 and / or the second plate 14 .

[0193] It should be noted that, when the partition wall 12 is separately connected to the first plate 13, the partition wall 12 may be integrally connected (i.e., integrally formed) to the shell body 15, or the partition wall 12 may be integrally connected to the second plate 14. Even more, when the shell body 15 and the second plate 14 are integrally connected, the partition wall 12 is integrally connected to the shell body 15 and the second plate 14.

[0194] By adopting the above-mentioned scheme, when the isolation wall 12 is separately connected to the first plate 13, by making the isolation wall 12 integrally connected to the shell body 15 and / or the second plate 14, the interference of the isolation wall 12 on the installation between the resonant rod assembly 20 and the first plate 13 can be reduced during the assembly process of the filter, and the assembly process of the isolation wall 12 relative to the shell body 15 and / or the second plate 14 can be saved, thereby effectively reducing the process and effectively improving the installation efficiency of the isolation wall 12 and the assembly efficiency of the filter.

[0195] Please refer to FIG. 3 , FIG. 4 , and FIG. 5 . In some embodiments of the present application, the resonant rod assembly 20 is integrally formed from a sheet metal substrate.

[0196] By adopting the above solution, the resonant rod assembly 20 can be integrally formed using a sheet metal substrate, thereby ensuring and improving the processing convenience, structural strength and assembly convenience of the resonant rod assembly 20, thereby ensuring and improving the assembly convenience of the filter.

[0197] In summary, the embodiments of the present application provide a specific example of a filter, wherein Figures 1 to 6 are structural schematic diagrams of the filter example, Figure 7 is a topological schematic diagram of the filter example, and Figure 8 is a simulation waveform diagram of the filter example.

[0198] Specifically, the filter housing 10 includes a first resonant rod assembly 20a, a second resonant rod assembly 20b, and a third resonant rod assembly 20c. The first resonant rod assembly 20a is a sheet metal component integrally formed from a sheet metal substrate. The first resonant rod assembly 20a includes a first resonant rod 21a, a second resonant rod 21b, and a third resonant rod 21c arranged in a row. The second resonant rod assembly 20b and the third resonant rod assembly 20c are another sheet metal component integrally formed from a sheet metal substrate. The second resonant rod assembly 20b includes a fourth resonant rod 21d, a fifth resonant rod 21e, a sixth resonant rod 21f, a seventh resonant rod 21g, and an eighth resonant rod 21h arranged in a row. The second resonant rod assembly 20b and the first resonant rod assembly 20a are arranged in different rows. The third resonant rod assembly 20c includes a ninth resonant rod 21i and a tenth resonant rod 21j arranged in a row. The third resonant rod assembly 20c is arranged in the same row as the first resonant rod assembly 20a.

[0199] One of the signal transmission terminals 60 is positioned in alignment with the first resonant rod 21a. The first resonant rod 21a has a coupling hole 218 corresponding to the signal transmission terminal 60. The inner conductor 61 of the signal transmission terminal 60 passes through the coupling hole 218 of the first resonant rod 21a, thereby capacitively coupling the signal transmission terminal 60 with the first resonant rod 21a. As a result, the signal transmission terminal 60 can transfer energy to the first resonant rod 21a.

[0200] The first resonant rod 21a and the second resonant rod 21b are connected by a first coupling rib 22. The first resonant rod 21a is provided with a third coupling member 215 extending toward the second resonant rod 21b, and the second resonant rod 21b is provided with a third coupling member 215 extending toward the first resonant rod 21a. Capacitive coupling is formed between the first resonant rod 21a and the second resonant rod 21b, so that the first resonant rod 21a can transfer energy to the second resonant rod 21b.

[0201] The second resonant rod 21b and the third resonant rod 21c are connected by a first coupling rib 22. The second resonant rod 21b is provided with a third coupling member 215 extending toward the third resonant rod 21c. Inductive coupling is formed between the second resonant rod 21b and the third resonant rod 21c, so that the second resonant rod 21b can transfer energy to the third resonant rod 21c.

[0202] The third resonant rod 21c and the fourth resonant rod 21d are arranged in opposition, and the isolation wall 12 of the filter housing 10 is provided with a second coupling window 122 between the third resonant rod 21c and the fourth resonant rod 21d. The third resonant rod 21c is provided with a first coupling member 211 extending toward the fourth resonant rod 21d, and the fourth resonant rod 21d is provided with a second coupling member 212 extending toward the third resonant rod 21c. The first coupling member 211 and the second coupling member 212 are capacitively coupled at the second coupling window 122, so that capacitive coupling is formed between the third resonant rod 21c and the fourth resonant rod 21d, so that the third resonant rod 21c can transfer energy to the fourth resonant rod 21d.

[0203] The fourth resonant rod 21d and the fifth resonant rod 21e are connected by a first coupling rib 22. The fifth resonant rod 21e is provided with a third coupling member 215 extending toward the fourth resonant rod 21d. Inductive coupling is formed between the fourth resonant rod 21d and the fifth resonant rod 21e, so that the fourth resonant rod 21d can transfer energy to the fifth resonant rod 21e.

[0204] The fifth resonant rod 21e and the sixth resonant rod 21f are connected by a first coupling rib 22. The fifth resonant rod 21e is provided with a third coupling member 215 extending toward the sixth resonant rod 21f, and the sixth resonant rod 21f is provided with a third coupling member 215 extending toward the fifth resonant rod 21e. Inductive coupling is formed between the fifth resonant rod 21e and the sixth resonant rod 21f, so that the fifth resonant rod 21e can transfer energy to the sixth resonant rod 21f.

[0205] The sixth resonant rod 21f and the seventh resonant rod 21g are connected by a first coupling rib 22. The sixth resonant rod 21f is provided with a third coupling member 215 extending toward the seventh resonant rod 21g, and the seventh resonant rod 21g is provided with a third coupling member 215 extending toward the sixth resonant rod 21f. Capacitive coupling is formed between the sixth resonant rod 21f and the seventh resonant rod 21g, so that the sixth resonant rod 21f can transfer energy to the seventh resonant rod 21g.

[0206] The isolation wall 12 of the filter housing 10 defines a first coupling window 121 between the second resonant rod 21b and the fifth resonant rod 21e, allowing the second resonant rod 21b and the fifth resonant rod 21e to be relative and cross-coupled through the first coupling window 121. Consequently, the second resonant rod 21b can transmit energy to the fifth resonant rod 21e via the third resonant rod 21c and the fourth resonant rod 21d, respectively, or directly to the fifth resonant rod 21e via the first coupling window 121. These two paths between the second resonant rod 21b and the fifth resonant rod 21e have a 180-degree phase difference at both the low and high ends of the passband, thereby forming a transmission zero at each of the low and high ends of the passband.

[0207] The isolation wall 12 of the filter housing 10 defines a first coupling window 121 between the first resonant rod 21a and the sixth resonant rod 21f, allowing the first resonant rod 21a and the sixth resonant rod 21f to be relative and cross-coupled through the first coupling window 121. As a result, the first resonant rod 21a can transmit energy to the sixth resonant rod 21f via the second resonant rod 21b and the fifth resonant rod 21e in sequence, or directly to the sixth resonant rod 21f via the first coupling window 121. These two paths between the first resonant rod 21a and the sixth resonant rod 21f have a 180-degree phase difference at both the low and high ends of the passband, thereby forming a transmission zero at each of the low and high ends of the passband. Among them, although the first resonant rod 21a can transmit energy to the sixth resonant rod 21f via the second resonant rod 21b, the third resonant rod 21c, the fourth resonant rod 21d, and the fifth resonant rod 21e, and can also directly transmit energy to the sixth resonant rod 21f through the first coupling window 121, the shortest path and the longest path between the first resonant rod 21a and the sixth resonant rod 21f do not meet the reverse condition, and a transmission zero point cannot be generated.

[0208] Useful parasitic coupling is generated between the first resonant rod 21a and the seventh resonant rod 21g via the first coupling window 121 between the first resonant rod 21a and the sixth resonant rod 21f. Consequently, the first resonant rod 21a can transfer energy to the seventh resonant rod 21g via the sixth resonant rod 21f, or directly to the seventh resonant rod 21g via the first coupling window 121. These two paths between the first resonant rod 21a and the seventh resonant rod 21g have a 180-degree phase difference at the low end of the passband, thereby forming a transmission zero at the low end of the passband.

[0209] The seventh resonant rod 21g and the eighth resonant rod 21h are connected by a first coupling rib 22. The seventh resonant rod 21g is provided with a third coupling member 215 extending toward the eighth resonant rod 21h, and the eighth resonant rod 21h is provided with a third coupling member 215 extending toward the seventh resonant rod 21g. Inductive coupling is formed between the seventh resonant rod 21g and the eighth resonant rod 21h, so that the seventh resonant rod 21g can transfer energy to the eighth resonant rod 21h.

[0210] The isolation wall 12 of the filter housing 10 is provided with a fourth coupling window 124 between the eighth resonant rod 21h and the ninth resonant rod 21i. A second coupling rib 30 is passed through the fourth coupling window 124. The eighth resonant rod 21h and the ninth resonant rod 21i are connected by the second coupling rib 30. Inductive coupling is formed between the eighth resonant rod 21h and the ninth resonant rod 21i, so that the eighth resonant rod 21h can transfer energy to the ninth resonant rod 21i.

[0211] The ninth resonant rod 21i and the tenth resonant rod 21j are connected by a first coupling rib 22. The ninth resonant rod 21i is provided with a third coupling member 215 extending toward the tenth resonant rod 21j. Inductive coupling is formed between the ninth resonant rod 21i and the tenth resonant rod 21j, so that the ninth resonant rod 21i can transfer energy to the tenth resonant rod 21j.

[0212] The isolation wall 12 of the filter housing 10 defines a third coupling window 123 between the eighth resonant rod 21h and the tenth resonant rod 21j. A common coupling rib (both the third coupling rib 40 and the fourth coupling rib 50) is inserted through the third coupling window 123. The first end 51 of the common coupling rib is connected to the tenth resonant rod 21j, and the second end 52 of the common coupling rib is connected to the first coupling rib 22 between the seventh resonant rod 21g and the eighth resonant rod 21h. Furthermore, the second end 52 of the fourth coupling rib 50 is positioned closer to the eighth resonant rod 21h. This allows the seventh resonant rod 21g to generate useful parasitic coupling with the tenth resonant rod 21j via the common coupling rib, while the eighth resonant rod 21h can also generate cross-coupling with the tenth resonant rod 21j via the common coupling rib. Combined with the primary signal transmission path of the seventh resonant rod 21g, the eighth resonant rod 21h, the ninth resonant rod 21i, and the tenth resonant rod 21j, the seventh resonant rod 21g, the eighth resonant rod 21h, the ninth resonant rod 21i, and the tenth resonant rod 21j form a nested structure. Specifically, the seventh resonant rod 21g can transfer energy to the tenth resonant rod 21j via the eighth resonant rod 21h and the shared coupling rib, or can parasitically couple energy directly to the tenth resonant rod 21j via the shared coupling rib, so that the two transmission paths between the seventh resonant rod 21g and the tenth resonant rod 21j have a phase difference of 180 degrees at the high end of the filter passband, thereby forming a transmission zero at the high end of the filter passband. Similarly, the eighth resonant rod 21h can transfer energy to the tenth resonant rod 21j via the ninth resonant rod 21i, or can directly transfer energy to the tenth resonant rod 21j via the shared coupling rib, so that the two paths between the eighth resonant rod 21h and the tenth resonant rod 21j have a phase difference of 180 degrees at the high end of the passband, thereby forming a transmission zero at the high end of the passband. Although the seventh resonant rod 21g can transfer energy to the tenth resonant rod 21j via the eighth and ninth resonant rods 21h and 21i, and can also parasitically couple to the tenth resonant rod 21j via a shared coupling rib, the shortest and longest paths between the seventh and tenth resonant rods 21g and 21j do not satisfy the inverse condition, and thus cannot generate a transmission zero. Therefore, the nested structure formed by the seventh, eighth, ninth, and tenth resonant rods 21g, 21h, 21i, and 21j forms two transmission zeros at the high end of the passband.

[0213] Another signal transmission end 60 is arranged in alignment with the tenth resonance rod 21j. The tenth resonance rod 21j is provided with a coupling hole 218 corresponding to the signal transmission end 60. The inner conductor 61 of the signal transmission end 60 is passed through the coupling hole 218 of the tenth resonance rod 21j, so that the signal transmission end 60 and the tenth resonance rod 21j are capacitively coupled. Based on this, the tenth resonance rod 21j can transfer energy to the signal transmission end 60. At this point, the filtering operation of the filter can be completed, and the filtering performance of the filter can be guaranteed and improved. Of course, in actual applications, the signal can be fed in from the signal transmission end 60 coupled to the tenth resonance rod 21j, and the signal can be fed out from the signal transmission end 60 coupled to the first resonance rod 21a. This is not limited in this embodiment.

[0214] Therefore, the filter can reliably establish a coupling relationship between the two resonant rods 21 by respectively setting the first coupling member 211 and the second coupling member 212 on the two resonant rods 21 without introducing external structures such as the coupling rod and the insulating structure supporting the coupling rod, thereby effectively reducing the number of components of the filter, effectively simplifying the structure of the filter, and facilitating the simplification and lightweighting of the filter product, and reducing the material cost and manufacturing cost of the filter product.

[0215] The filter can also enable two resonant rods 21 of different resonant rod assemblies 20 to be relative and coupled via the first coupling window 121; it can also enable two resonant rods 21 of different resonant rod assemblies 20 to be coupled via the second coupling rib 30; it can also connect between multiple resonant rods 21 of adjacent resonant rod assemblies 20 via the third coupling rib 40 and the fourth coupling rib 50, so that the multiple resonant rods 21 of adjacent resonant rod assemblies 20 can generate cross-coupling and useful parasitic coupling via the third coupling rib 40 and the fourth coupling rib 50. Based on this, the filter can achieve a design of 10 cavities and 7 zeros, which can break through the number of achievable zeros of existing filters and achieve a strong out-of-band suppression effect, so that the filter can better filter out clutter signals and interference signals, achieve a better filtering effect, and better meet the needs of miniaturized and highly selective filters. Moreover, the arrangement of the first coupling window 121, the second coupling rib 30, the third coupling rib 40, and the fourth coupling rib 50 can further save coupling rods and other components compared to existing filters, thereby further simplifying the structure of the filter and making the filter simpler and lighter.

[0216] Of course, based on the principles of the above-mentioned embodiments, the embodiments of the present application can form more filter examples by changing the topology of the filter, so that the filter can achieve more zero-point design. For example, Figure 9 is a schematic diagram of the topology of another filter example, and Figure 10 is a simulation waveform diagram of the filter example shown in Figure 9. Compared with the previous filter example, the filter example shown in Figure 9 has made the following adjustments: the capacitive coupling between the first resonant rod 21a and the second resonant rod 21b is adjusted to inductive coupling; the inductive coupling between the first resonant rod 21a and the sixth resonant rod 21f is adjusted to capacitive coupling; the capacitive coupling between the sixth resonant rod 21f and the seventh resonant rod 21g is adjusted to inductive coupling; and a coupling relationship is added between the signal transmission end 60 arranged in opposition to the tenth resonant rod 21j and the seventh resonant rod 21g. Based on the above adjustments, the filter example shown in Figure 9 can achieve a 10-cavity 8-zero design through a basically similar structure, which can further exceed the achievable number of zeros in existing filters and achieve a strong out-of-band suppression effect, allowing the filter to better filter out clutter and interference signals, achieving better filtering effects, and better meeting the needs of miniaturized and highly selective filters.

[0217] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A filter, characterized in that: It comprises a filter housing, and a plurality of resonant rod assemblies arranged in the filter housing, wherein the resonant rod assembly comprises at least one resonant rod; At least one of the resonant rods is provided with a first coupling member, the first coupling member extends toward the resonant rod of the adjacent resonant rod assembly, and is used for capacitive coupling with the resonant rod of the adjacent resonant rod assembly; The resonant rod capacitively coupled with the first coupling member is provided with a second coupling member, and the second coupling member extends toward the first coupling member and is used for capacitive coupling with the first coupling member.

2. The filter according to claim 1, characterized in that The first coupling member includes a first extending portion extending toward the second coupling member; Alternatively, the first coupling member includes a first extending portion extending toward the second coupling member, and a first coupling portion bent and connected to an end portion of the first extending portion.

3. The filter according to claim 1, characterized in that The second coupling member includes a second extending portion extending toward the first coupling member; Alternatively, the second coupling member includes a second extending portion extending toward the first coupling member, and a second coupling portion bent and connected to an end portion of the second extending portion.

4. The filter according to claim 1, characterized in that The first coupling member is integrally connected to the free end of the corresponding resonant rod; and / or the second coupling member is integrally connected to the free end of the corresponding resonant rod.

5. The filter according to claim 1, characterized in that The resonant rod assembly includes a first coupling rib, and the first coupling rib is connected between adjacent resonant rods of the same resonant rod assembly.

6. The filter according to claim 1, characterized in that At least one of the resonant rods is provided with a third coupling member, and the third coupling member is extended toward the adjacent resonant rod of the same resonant rod assembly.

7. The filter according to claim 6, characterized in that The third coupling member comprises a third extension portion extending toward the adjacent resonant rod of the same resonant rod assembly; Alternatively, the third coupling member includes a third extending portion extending toward the adjacent resonant rod of the same resonant rod assembly, and a third coupling portion bent and connected to an end portion of the third extending portion.

8. The filter according to claim 1, characterized in that The filter housing is provided with a first coupling window, wherein the first coupling window is provided between adjacent resonant rod assemblies and is used to couple at least one group of two resonant rods that are opposite to each other along the first coupling window; And / or, the filter further includes a second coupling rib, wherein the second coupling rib is connected between adjacent resonant rod components.

9. The filter according to claim 1, characterized in that The filter further includes a third coupling rib, which is connected between two resonant rods of the adjacent resonant rod assemblies and is used to cross-couple the two resonant rods of the adjacent resonant rod assemblies.

10. The filter according to claim 9, characterized in that The filter also includes a fourth coupling rib connected between adjacent resonant rod assemblies, the fourth coupling rib having a first end and a second end relative to each other, the first end being connected to the resonant rod of one of the resonant rod assemblies, and the second end being connected between two adjacent resonant rods of another resonant rod assembly.

11. The filter according to claim 10, characterized in that At least one of the third coupling ribs and at least one of the fourth coupling ribs are common coupling ribs.

12. The filter according to claim 9, characterized in that The third coupling rib is extended in a curve.

13. The filter according to claim 9, characterized in that At least one of the resonant rods connected to the third coupling rib is provided with a mounting groove, for allowing the corresponding end of the third coupling rib to be limitedly mounted therein; And / or, at least one of the resonant rods connected to the third coupling rib is provided with a supporting portion for supporting a corresponding end portion of the third coupling rib.

14. The filter according to claim 1, characterized in that The filter includes two signal transmission ends installed on the filter housing, one of which is coupled to the resonant rod of one of the resonant rod assemblies, and the other is coupled to the resonant rod of the other resonant rod assembly.

15. The filter according to claim 14, characterized in that At least one of the signal transmission ends is provided with an inner conductor; At least one of the resonant rod components is provided with a coupling hole corresponding to the inner conductor, and the inner conductor passes through the coupling hole and is coupled to the at least one of the resonant rods.

16. The filter according to any one of claims 1 to 15, characterized in that The filter housing comprises a first plate member for mounting the resonant rod assembly, a second plate member arranged opposite to the first plate member, and a shell body connected between the second plate member and the first plate member, wherein the second plate member, the shell body and the first plate member together enclose a closed inner cavity; Among them, the shell body is integrally connected to the second plate, and the shell body is separately connected to the first plate; or, the shell body is separately connected to the second plate, and the shell body is separately connected to the first plate; or, the shell body is separately connected to the second plate, and the shell body is integrally connected to the first plate.

17. The filter according to claim 16, characterized in that The filter housing is provided with a partition wall between two adjacent resonant rod assemblies, and the partition wall is separately connected to the first plate.

18. The filter according to claim 17, characterized in that The partition wall is integrally connected to the shell body and / or the second plate.

19. The filter according to any one of claims 1 to 15, characterized in that The resonant rod assembly is integrally formed from a sheet metal substrate.

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