Filter

Abstract

The invention relates to the field of radio frequency devices, and provides a filter which comprises a filter shell and a plurality of resonance rod assemblies arranged in the filter shell, and each resonance rod assembly comprises at least one resonance rod. At least one resonance rod is provided with a first coupling piece, and the first coupling piece extends towards the resonance rod of the adjacent resonance rod assembly and is used for being capacitively coupled with the resonance rod of the adjacent resonance rod assembly; the resonant rod capacitively coupled to the first coupling member is provided with a second coupling member which extends towards the first coupling member for capacitively coupling to the first coupling member. On the basis of the structure, the two resonance rods of at least one group of adjacent resonance rod assemblies can be capacitively coupled through the first coupling piece and the second coupling piece, so that the coupling relation between the two resonance rods can be reliably constructed. Since the first coupling piece and the second coupling piece are respectively arranged on the two resonance rods, capacitive coupling can be realized without introducing external structures such as coupling rods, so that the number of parts of the filter can be reduced, and the structure of the filter can be simplified.

Description

Technical Field

[0001] The present application belongs to the technical field of radio frequency devices, and in particular, relates to a filter. Background Art

[0002] Existing filters usually include a filter housing, a resonant rod disposed in the filter housing, and a coupling rod disposed between the two resonant rods and used to achieve capacitive coupling between the two resonant rods. To achieve capacitive coupling, the coupling rod needs to be insulated and disposed in the filter housing. In existing designs, the coupling rod is usually mounted on the filter housing through an insulating structure. The insulating structure not only achieves insulation between the coupling rod and the filter housing, but also provides fixing and support for the coupling rod. Based on this, the existing filter has a relatively large number of parts and a relatively complex structure. Summary of the invention

[0003] The embodiment of the present application provides a filter, aiming to solve the problem that the existing filter has a relatively large number of components and a relatively complex structure.

[0004] To achieve the above-mentioned purpose, 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;

[0005] 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;

[0006] 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.

[0007] In some embodiments, the first coupling member includes a first extension portion extending toward the second coupling member;

[0008] 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.

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

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] In some embodiments, the third coupling member includes a third extension portion extending toward an adjacent resonant rod of the same resonant rod assembly;

[0015] 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.

[0016] 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, and is used to couple at least one group of two resonant rods that are opposite to each other along the first coupling window;

[0017] And / or, the filter further includes a second coupling rib, wherein the second coupling rib is connected between adjacent resonant rod components.

[0018] 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.

[0019] 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.

[0020] In some embodiments, at least one of the third coupling ribs and at least one of the fourth coupling ribs are common coupling ribs.

[0021] In some embodiments, the third coupling rib is arranged to extend in a curve.

[0022] 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 of the third coupling rib to be limitedly mounted therein.

[0023] In some embodiments, 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.

[0024] In some embodiments, the filter includes two signal transmission ends installed on the filter housing, one of the signal transmission ends is coupled to the resonance rod of one of the resonance rod assemblies, and the other signal transmission end is coupled to the resonance rod of the other resonance rod assembly.

[0025] In some embodiments, at least one of the signal transmission ends is provided with an inner conductor;

[0026] 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.

[0027] In some embodiments, the filter housing includes a first plate for mounting the resonant rod assembly, a second plate disposed opposite to the first plate, and a shell body connected between the second plate and the first plate, wherein the second plate, the shell body and the first plate together enclose a closed inner cavity;

[0028] 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.

[0029] 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.

[0030] In some embodiments, the isolation wall is integrally connected to the shell body and / or the second plate.

[0031] In some embodiments, the resonant rod assembly is integrally formed from a sheet metal substrate.

[0032] The filter provided by the present application has the following beneficial effects:

[0033] The filter provided in the embodiment of the present application, in at least one group of two resonant rods belonging to adjacent resonant rod assemblies, 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 reliably establish the coupling relationship between the two resonant rods through capacitive coupling of 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 lightness of the filter product, and reducing the material cost and manufacturing cost of the filter product, and improving the assembly efficiency of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0035] Figure 1 A three-dimensional schematic diagram of a filter provided in an embodiment of the present application;

[0036] Figure 2 for Figure 1 A cross-sectional view along AA is provided;

[0037] Figure 3 for Figure 1 An exploded schematic diagram of the filter provided;

[0038] Figure 4 for Figure 3 A three-dimensional schematic diagram of a first resonant rod assembly is provided;

[0039] Figure 5 for Figure 3 A three-dimensional schematic diagram of a second resonant rod assembly, a third resonant rod assembly and a second coupling rib is provided;

[0040] Figure 6 for Figure 3 A three-dimensional schematic diagram of a second plate, a shell body and a partition wall is provided;

[0041] Figure 7 for Figure 1 A schematic diagram of the filter topology provided;

[0042] Figure 8 for Figure 1 Provided filter simulation waveform diagram;

[0043] Fig. 9 A schematic diagram of the topological structure of a filter provided in another embodiment of the present application;

[0044] Fig.10 for Fig. 9 The simulation waveform of the filter is provided.

[0045] Among them, the reference numerals in the figure are:

[0046] 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 resonance rod assembly, 20b-second resonance rod assembly, 20c-third resonance rod assembly; 21-resonance rod, 21a-first resonance rod, 21b-second resonance rod, 21c-third resonance rod, 21d-fourth resonance rod, 21e-fifth resonance rod, 21f-sixth resonance rod, 21g-seventh resonance 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-installing 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

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clear and understandable, the application is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0048] In the description of the present 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 the present 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 should not be understood as a limitation on the present application.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] Existing filters usually include a filter housing, a resonant rod disposed in the filter housing, and a coupling rod disposed between the two resonant rods and used to achieve capacitive coupling between the two resonant rods. To achieve capacitive coupling, the coupling rod needs to be insulated and disposed in the filter housing. In existing designs, the coupling rod is usually mounted on the filter housing through an insulating structure. The insulating structure not only achieves insulation between the coupling rod and the filter housing, but also provides fixing and support for the coupling rod. Based on this, the existing filter has a relatively large number of parts and a relatively complex structure.

[0052] Therefore, the present application provides a filter that can reduce the number of components, simplify the structure, and facilitate the miniaturization, simplification, and lightweight of the filter product.

[0053] The specific implementation of this application is described in detail below in conjunction with specific embodiments:

[0054] See also Figure 1 , Figure 2 , Figure 3 Some embodiments of the present application provide a filter, including a filter housing 10, and a plurality of resonant rod assemblies 20 disposed in 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, the first coupling member 211 extends toward the resonant rod 21 of the adjacent resonant rod assembly 20, and is used for capacitive coupling 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, the second coupling member 212 extends toward the first coupling member 211, and is used for capacitive coupling with the first coupling member 211.

[0055] It should be noted that the filter housing 10 has a closed inner cavity 11 inside, which can achieve a shielding function to prevent signal leakage. The inner cavity 11 can be divided into at least one resonant cavity, and the resonant cavity can accommodate a resonant rod 21. This embodiment does not limit the shape, size, material, etc. of the filter housing 10.

[0056] It should also be noted that the resonant rod assembly 20 includes a resonant rod 21 or a plurality of resonant rods 21 arranged in a row. The number of resonant rod assemblies 20 is at least two, and the plurality of 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 in the same column may be one or more, and this embodiment does not limit this.

[0057] Among them, the resonance rod 21 is a metal part, which can be a sheet metal part. The resonance rod 21 has a connection end 213 connected to the filter housing 10, and a free end 214 opposite to the connection end 213. The connection end 213 of the resonance rod 21 is the end of the resonance rod 21 connected to the filter housing 10 (for example, the first plate 13), and the free end 214 of the resonance rod 21 is the end of the resonance rod 21 away from its connection end 213 and spaced from the filter housing 10 (for example, the second plate 14). Optionally, the resonance 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.

[0058] 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 that do not need to be coupled between adjacent resonant rod assemblies 20, shields irrelevant signals, prevents signal interference, and forms a complete and orderly signal transmission channel inside the filter. A coupling window (e.g., a first coupling window 121, a second coupling window 122, a third coupling window 123, a fourth coupling window 124, etc.) can be opened on the partition wall 12, and two resonant rods 21 opposite to each other along the coupling window can establish a coupling relationship through the coupling window.

[0059] 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 capacitively coupled by 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 therethrough, so as to facilitate capacitive coupling between the first coupling member 211 and the second coupling member 212.

[0060] It should also be noted that, among the two resonant rods 21 of at least one group 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, and at least one of the first coupling member 211 and the second coupling member 212 is inserted into 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, so as to reliably establish a coupling relationship therebetween. Since the first coupling member 211 and the second coupling member 212 are respectively arranged 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.

[0061] 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.

[0062] Among them, the two resonant rods 21 that realize capacitive coupling through the first coupling member 211 and the second coupling member 212 belong to different resonant rod assemblies 20, but the two resonant rods 21 can 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 capacitive coupling realized by the two resonant rods 21 through the first coupling member 211 and the second coupling member 212 is the 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 realized 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.

[0063] Among them, the two resonant rods 21 that achieve capacitive coupling through 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 achieve capacitive coupling through 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.

[0064] 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 may not be arranged relative to each other, and this embodiment does not impose any limitation on this.

[0065] Among them, the first coupling member 211 can be connected to the corresponding resonance rod 21 in one piece or in a separate piece, and this embodiment does not limit this; the first coupling member 211 can be set at the free end 214 of the corresponding resonance rod 21, and can also be set at any position between the free end 214 and the connection end 213 of the corresponding resonance rod 21, and this embodiment does not limit this. Similarly, the second coupling member 212 can be connected to the corresponding resonance rod 21 in one piece or in a separate piece, and this embodiment does not limit this; the second coupling member 212 can be set at the free end 214 of the corresponding resonance rod 21, and can also be set at any position between the free end 214 and the connection end 213 of the corresponding resonance rod 21, and this embodiment does not limit this.

[0066] Therein, at least one second coupling window 122 is provided, 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 .

[0067] For example, Figure 2 , Figure 3 As shown, in an example of the filter, ten resonant rods 21 are provided in the filter housing 10, and 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.

[0068] 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 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 main signal transmission path. Among them, 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, and 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 achieved between the third resonant rod 21c and the fourth resonant rod 21d.

[0069] In summary, in 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, a first coupling member 211 extending toward the other resonant rod 21 is provided on one of the resonant rods 21, and a second coupling member 212 extending toward one of the resonant rods 21 is provided on the other resonant rod 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 parts of the filter, effectively simplifying the structure of the filter, and facilitating the miniaturization, simplification, and lightness of the filter product, and reducing the material cost and manufacturing cost of the filter product, and improving the assembly efficiency of the filter.

[0070] Optionally, see Figure 2 , Figure 3 , Figure 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 .

[0071] It should be noted that one end of the first extension portion 2111 is integrally connected to the corresponding resonant rod 21 or separately connected. 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 may 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 may be arbitrarily extended along the top, bottom, left, right, front, and back as needed; the extension path of the first extension portion 2111 may be, but is not limited to, a straight line; and so on, which are not limited to the present embodiment.

[0072] By adopting the above solution, the first coupling member 211 can be connected to the corresponding resonant rod 21 through the first extension part 2111, and extend toward the second coupling member 212, so as to achieve capacitive coupling with the second coupling member 212 through the portion of the first extension part 2111 away from the corresponding resonant rod 21. Based on this, the structure of the first coupling member 211 can be simplified, the design difficulty and processing difficulty of the first coupling member 211 can be reduced, and the cost of the first coupling member 211 and the resonant rod 21 provided with the first coupling member 211 can be saved. At the same time, it is convenient for the two resonant rods 21 of the adjacent resonant rod assembly 20 to achieve capacitive coupling conveniently, quickly and reliably through the second coupling member 212 and the simplified first coupling member 211, thereby ensuring and improving the performance of the first coupling member 211.

[0073] Optionally, see Figure 2 , Figure 3 , Figure 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 , and a first coupling portion 2112 bent and connected to an end of the first extending portion 2111 .

[0074] It should be noted that, based on the previous embodiment, that is, based on the first coupling member 211 being provided with the 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 away from the corresponding resonant rod 21. The other end of the first coupling portion 2112 is bent relative to one end thereof, and is used to be arranged opposite to the second coupling member 212 and capacitively coupled. Among them, the bending direction, extension direction and extension length of the first coupling portion 2112 can be arbitrarily set as needed, and this embodiment does not limit this.

[0075] Therefore, by adopting the above scheme, the first coupling member 211 can be connected to the corresponding resonant rod 21 through the first extension part 2111, and extend toward the second coupling member 212, so that the first coupling member 2112 can be reliably supported by the first extension part 2111, and the first coupling member 2112 is close to the second coupling member 212; on this basis, the first coupling member 2112 connected to the end of the first extension part 2111 away from the corresponding resonant rod 21 by bending is arranged opposite to the second coupling member 212, and capacitive coupling is achieved. Based on this, the structure of the first coupling member 211 can be relatively simplified, the design difficulty and processing difficulty of the first coupling member 211 can be relatively reduced, and the cost of the first coupling member 211 and the resonant rod 21 provided with the first coupling member 211 can be relatively saved. 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.

[0076] Optionally, see Figure 2 , Figure 3 , Figure 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 .

[0077] It should be noted that one end of the second extension portion 2121 is integrally connected or separately connected to the corresponding resonant rod 21. The other end of the second extension portion 2121 is extended toward the first coupling member 211. The extension direction of the second extension portion 2121 may 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 may be arbitrarily extended along the top, bottom, left, right, front, and back as needed; the extension path of the second extension portion 2121 may be, but is not limited to, a straight line; and so on, which are not limited to this in the present embodiment.

[0078] By adopting the above solution, the second coupling member 212 can be connected to the corresponding resonant rod 21 through the second extension part 2121, and extend toward the first coupling member 211, so as to achieve capacitive coupling with the first coupling member 211 through the portion of the second extension part 2121 away from the corresponding resonant rod 21. Based on this, the structure of the second coupling member 212 can be simplified, the design difficulty and processing difficulty of the second coupling member 212 can be reduced, and the cost of the second coupling member 212 and the resonant rod 21 provided with the second coupling member 212 can be saved. At the same time, it is convenient for the two resonant rods 21 of the adjacent resonant rod assembly 20 to achieve capacitive coupling 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.

[0079] Optionally, see Figure 2 , Figure 3 , Figure 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 , and a second coupling portion 2122 bent and connected to an end of the second extending portion 2121 .

[0080] It should be noted that, based on the previous embodiment, that is, based on the second coupling member 212 being provided with the 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 one end thereof, and is used to be arranged relative to the first coupling member 211 (especially the first coupling portion 2112) and capacitively coupled. Among them, the bending direction, extension direction and extension length of the second coupling portion 2122 can be arbitrarily set as needed, and this embodiment does not limit this.

[0081] Therefore, by adopting the above solution, the second coupling member 212 can be connected to the corresponding resonant rod 21 through the second extension part 2121, and extend toward the first coupling member 211, so as to reliably support the second coupling member 2122 through the second extension part 2121, and make the second coupling member 2122 close to the first coupling member 211; on this basis, the second coupling member 2122 connected to the end of the second extension part 2121 away from the corresponding resonant rod 21 by bending is arranged opposite to the first coupling member 211, and capacitive coupling is achieved. Based on this, the structure of the second coupling member 212 can be relatively simplified, the design difficulty and processing difficulty of the second coupling member 212 can be relatively reduced, and the cost of the second coupling member 212 and the resonant rod 21 provided with the second coupling member 212 can be relatively saved. At the same time, since the second coupling member 212 can protect 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 protecting and improving the performance of the second coupling member 212.

[0082] Alternatively, if Figure 3 As shown, when the first coupling member 211 is provided with a first coupling portion 2112, and the second coupling portion 2122 is provided corresponding to the second coupling member 212, the first coupling portion 2112 and the second coupling portion 2122 can be arranged parallel and opposite to each other. Such an arrangement can help to ensure and increase the opposite area between the first coupling portion 2112 and the second coupling portion 2122, and can help to enhance the coupling therebetween.

[0083] See also Figure 2 , Figure 3 , Figure 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 .

[0084] By adopting the above scheme, the first coupling member 211 can be integrally connected and integrally formed with the corresponding resonant rod 21, so that the first coupling member 211 can be processed and formed at the same time when the corresponding resonant rod 21 is processed and formed, thereby ensuring and improving the processing convenience of the first coupling member 211. In addition, the first coupling member 211 can be integrally connected to the free end 214 of the corresponding resonant rod 21, so that the first coupling member 211 can not only be used as a component for capacitive coupling with the second coupling member 212, but also as a resonant disk of the resonant rod 21, so as to correspondingly reduce 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 (for example, bent) to form the required first coupling member 211 for capacitive coupling with the second coupling member 212, thereby making it easier to process and form the first coupling member 211.

[0085] See also Figure 2 , Figure 3 , Figure 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 .

[0086] By adopting the above scheme, the second coupling member 212 can be integrally connected and integrally formed with the corresponding resonant rod 21, so that the second coupling member 212 can be processed and formed at the same time when the corresponding resonant rod 21 is processed and formed, thereby ensuring and improving the processing convenience of the second coupling member 212. In addition, the second coupling member 212 can be integrally connected to the free end 214 of the corresponding resonant rod 21, so that the second coupling member 212 can not only be used as a component for capacitive coupling with the first coupling member 211, but also as a resonant disk of the resonant rod 21, so as to reduce the resonant frequency of the corresponding resonant cavity accordingly. In other words, the existing resonant disk of the resonant rod 21 can also be integrally formed (for example, bent) to form the required second coupling member 212 for capacitive coupling with the first coupling member 211, so that the processing and forming of the second coupling member 212 can be more convenient.

[0087] See also Figure 3 , Figure 4 , Figure 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 .

[0088] It should be noted that the resonant rod assembly 20 may include a plurality of resonant rods 21. For the plurality of resonant rods 21 of the same resonant rod assembly 20, adjacent resonant rods 21 may 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 may be connected to the connecting end 213 of the resonant rod 21, or may 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 may be connected as one piece or in parts, which is not limited in this embodiment. The extension path of the first coupling rib 22 may be in a straight line shape, or may be in a bent shape, etc., which is not limited in this embodiment.

[0089] For example, Figure 3 , Figure 4 , Figure 5 As shown, in an 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 respectively through the first coupling ribs 22, so that energy can be transmitted along the first resonant rod 21a, the second resonant rod 21b and the third resonant rod 21c in sequence. 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 respectively through the first coupling ribs 22, so that energy can be transmitted 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 sequence. 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, so that energy can be transmitted along the ninth resonant rod 21i and the tenth resonant rod 21j in sequence. This facilitates energy transmission in each resonant rod assembly 20 and facilitates the formation of a main signal transmission path.

[0090] By adopting the above solution, adjacent resonant rods 21 of the same resonant rod assembly 20 can be connected through the first coupling ribs 22, so that energy can be transmitted sequentially along the resonant rods 21 of the same resonant rod assembly 20. Based on this, it can be ensured that energy can be transmitted sequentially in the same resonant rod assembly 20 according to the preset signal transmission path, thereby ensuring the performance of the filter.

[0091] See also Figure 3 , Figure 4 , Figure 5 In some embodiments of the present application, at least one resonant rod 21 is provided with a third coupling member 215 , and the third coupling member 215 is extended toward an adjacent resonant rod 21 of the same resonant rod assembly 20 .

[0092] 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, and some resonant rods 21 may be provided with one or more third coupling members 215, which can be provided as required. Of course, there may be some resonant rod assemblies 20 in which all resonant rods 21 are not provided with the third coupling member 215.

[0093] 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, so as to facilitate the coupling of the resonant rod 21 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 enhance the 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.

[0094] 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 limit this.

[0095] For example, Figure 3 , Figure 4 , Figure 5As shown, 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 beneficial to enhance 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 beneficial to enhance 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 beneficial to enhance 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 beneficial to enhance 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.

[0096] 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 with an adjacent resonant rod 21 of the same resonant rod assembly 20 through the third coupling member 215, or even enhance the coupling. Based on this, the coupling between two adjacent resonant rods 21 of the same resonant rod assembly 20 can be enhanced through the third coupling member 215, thereby effectively ensuring and improving the performance of the filter.

[0097] Optionally, see Figure 3 , Figure 4 , Figure 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 .

[0098] It should be noted that one end of the third extension portion 2151 is integrally connected or separately connected to the corresponding resonant rod 21. The other end of the third extension portion 2151 is extended toward the adjacent resonant rod 21 of the same resonant rod assembly 20. The extension direction of the third extension portion 2151 may 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 third extension portion 2151 may be arbitrarily extended along the top, bottom, left, right, front, and back as needed; the extension path of the third extension portion 2151 may be, but is not limited to, a straight line; and so on, which are not limited to the present embodiment.

[0099] For example, Figure 3 , Figure 4 , Figure 5 As shown, in an example of the filter, the third coupling member 215 arranged on the second resonance rod 21b and extending toward the third resonance rod 21c, the third coupling member 215 arranged on the sixth resonance rod 21f and extending toward the fifth resonance rod 21e, and the third coupling member 215 arranged on the seventh resonance rod 21g and extending toward the eighth resonance rod 21h are all the third coupling members 215 provided in this embodiment, i.e., include the third extension portion 2151.

[0100] By adopting the above solution, the third coupling member 215 can be connected to the corresponding resonant rod 21 through the third extension portion 2151, and extend toward the adjacent resonant rod 21 of the same resonant rod assembly 20, so as to be arranged opposite to the adjacent resonant rod 21 of the same resonant rod assembly 20 through the portion of the third extension portion 2151 away from the corresponding resonant rod 21, so as to facilitate the coupling of the resonant rod 21 with the adjacent resonant rod 21 of the same resonant rod assembly 20, and even enhance the coupling. Based on this, the structure of the third coupling member 215 can be simplified, the design difficulty and processing difficulty of the third coupling member 215 can be reduced, and the cost of the third coupling member 215 and the resonant rod 21 provided with the third coupling member 215 can be saved. At the same time, it is convenient to reliably enhance the coupling between two adjacent resonant rods 21 of the same resonant rod assembly 20 through the third coupling member 215.

[0101] Optionally, see Figure 3 , Figure 4 , Figure 5 In some embodiments of the present application, the third coupling member 215 includes a third extension portion 2151 extending toward an adjacent resonant rod 21 of the same resonant rod assembly 20 , and a third coupling portion 2152 bent and connected to an end of the third extension portion 2151 .

[0102] It should be noted that, based on the previous embodiment, that is, based on 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 away from the corresponding resonant rod 21. The other end of the third coupling portion 2152 is bent relative to one end thereof, which is conducive to being arranged relative to and coupled with the adjacent resonant rod 21 of the same resonant rod assembly 20. Among them, the bending direction, extension direction and extension length of the third coupling portion 2152 can be arbitrarily set as needed, and this embodiment does not limit this.

[0103] Alternatively, if Figure 3 , Figure 4 , Figure 5 As shown, when the third coupling portion 2152 is provided between two adjacent resonant rods 21, the two third coupling portions 2152 are provided in parallel and opposite to each other. When the third coupling portion 2152 is provided only between 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 resonant rod 21 opposite to it, that is, the third coupling portion 2152 and the resonant rod 21 opposite to it are provided in parallel and opposite to each other. Such a configuration can help to ensure and increase the opposite area between the third coupling portion 2152 and the resonant rod 21 opposite to it, which can help to enhance the coupling.

[0104] For example, Figure 3 , Figure 4 , Figure 5 As shown, in an example of the filter, the third coupling member 215 of the first resonant rod 21a extending toward the second resonant rod 21b, the third coupling member 215 of the second resonant rod 21b extending toward the first resonant rod 21a, the third coupling member 215 of the fifth resonant rod 21e extending toward the fourth resonant rod 21d, the third coupling member 215 of the fifth resonant rod 21e extending toward the sixth resonant rod 21f, the third coupling member 215 of the sixth resonant rod 21f extending toward the seventh resonant rod 21g, the third coupling member 215 of the seventh resonant rod 21g extending toward the sixth resonant rod 21f, the third coupling member 215 of the eighth resonant rod 21h extending toward the seventh resonant rod 21g, and the third coupling member 215 of the ninth resonant rod 21i extending toward the tenth resonant rod 21j are all the third coupling members 215 provided in this embodiment, that is, they include the third extension portion 2151 and the third coupling portion 2152.

[0105] By adopting the above solution, the third coupling member 215 can be connected to the corresponding resonant rod 21 through the third extension part 2151, and extend toward the adjacent resonant rod 21 of the same resonant rod assembly 20, so as to reliably support the third coupling part 2152 through the third extension part 2151, and make the third coupling part 2152 close to the adjacent resonant rod 21 of the same resonant rod assembly 20; on this basis, the third coupling part 2152 connected to the end of the third extension part 2151 away from the corresponding resonant rod 21 by bending is arranged opposite to the adjacent resonant rod 21 of the same resonant rod assembly 20 and achieves coupling. Based on this, the structure of the third coupling member 215 can be relatively simplified, the design difficulty and processing difficulty of the third coupling member 215 can be relatively reduced, and the cost of the third coupling member 215 and the resonant rod 21 provided with the third coupling member 215 can be relatively saved. 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 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.

[0106] See also Figure 3 , Figure 4 , Figure 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 .

[0107] By adopting the above scheme, the third coupling member 215 can be integrally connected and integrally formed with the corresponding resonant rod 21, so that the third coupling member 215 can be processed and formed at the same time when the corresponding resonant rod 21 is processed and formed, thereby ensuring and improving the processing convenience of the third coupling member 215. In addition, the third coupling member 215 can be integrally connected to the free end 214 of the corresponding resonant rod 21, so that the third coupling member 215 can not only be used as a component for enhancing coupling, but also as a resonant disk of the resonant rod 21, so as to correspondingly reduce 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 (for example, bent) to form the required third coupling member 215 for enhancing coupling, so that the processing and forming of the third coupling member 215 can be more convenient.

[0108] See also Figure 2 , Figure 3 , Figure 6 In some embodiments of the present application, the filter housing 10 is provided with a first coupling window 121, and 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.

[0109] It should be noted that the filter housing 10 is provided with a partition wall 12 between adjacent resonant rod assemblies 20 arranged in the same row or different rows. The partition 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 partition wall 12, and 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, and 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.

[0110] 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 non-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.

[0111] For example, Figure 2 , Figure 3 , Figure 6As shown, in an example of the filter, a partition wall 12 is provided between the first resonant rod component 20a, the second resonant rod component 20b, and the third resonant rod component 20c. A first coupling window 121 is provided in the region between the corresponding second resonant rod 21b and the fifth resonant rod 21e of the partition wall 12, so that the second resonant rod 21b and the fifth resonant rod 21e are 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, and can also directly transmit energy to the fifth resonant rod 21e through the first coupling window 121, and the 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, so that a transmission zero point can be formed 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 directly transmit energy to the sixth resonant rod 21f through the first coupling window 121. The two paths between the first resonant rod 21a and the sixth resonant rod 21f have a phase difference of 180 degrees at the low and high ends of the passband, thereby forming a transmission zero point at the low and high ends 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 directly transfer 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. In addition, based on the first coupling window 121 between the first resonant rod 21a and the sixth resonant rod 21f, useful parasitic coupling can also be generated between the first resonant rod 21a and the seventh resonant rod 21g. Based on this, the first resonant rod 21a can transfer energy to the seventh resonant rod 21g via the sixth resonant rod 21f, and can also directly transfer energy to the seventh resonant rod 21g through the first coupling window 121. The 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 point at the low end of the passband.

[0112] By adopting the above scheme, the two resonant rods 21 of at least one group of adjacent resonant rod assemblies 20 can be relative and coupled through the first coupling window 121 opened in the partition wall 12, so that energy can be transmitted from the resonant rod 21 of one resonant rod assembly 20 to the resonant rod 21 of another resonant rod assembly 20, so that energy can be transmitted between adjacent resonant rod assemblies 20. Based on this, it can be ensured that energy can be transmitted between different resonant rod assemblies 20 according to the preset signal transmission path, thereby ensuring the performance of the filter, and even cross-coupling and useful parasitic coupling can be constructed based on the first coupling window 121 to ensure and enhance the out-of-band suppression effect and filtering effect of the filter, so that the filter can meet the high selectivity requirements. In addition, since the first coupling window 121 has a simple structure, the two resonant rods 21 of different resonant rod assemblies 20 can be relative and coupled through the first coupling window 121. Therefore, compared with the existing filter, it can further save components such as coupling rods, thereby effectively simplifying the structure of the filter, which can help the filter to be more miniaturized, simpler and lighter.

[0113] See also Figure 2 , Figure 3 , Figure 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.

[0114] 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 arranged to overlap, that is, the first coupling window 121 and the second coupling window 122 may be combined into a common coupling window.

[0115] For example, Figure 2 , Figure 3As shown, 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, and the second coupling window 122 allows at least one of the first coupling member 211 and the second coupling member 212 to pass through, so that the first coupling member 211 and the second coupling member 212 can 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, and at this time, the second coupling window 122 can make the third resonant rod 21c and the fourth resonant rod 21d arranged opposite to each other inductively coupled. 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 final coupling polarity 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.

[0116] By adopting the above scheme, 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, on the basis of ensuring that the required 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 simplified, and the structural strength of the partition wall 12 can be effectively guaranteed, so as to improve the overall structural strength of the filter and reduce the difficulty of processing the filter.

[0117] 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.

[0118] See also Figure 2 , Figure 3 In some embodiments of the present application, the filter further includes a second coupling rib 30 , and the second coupling rib 30 is connected between adjacent resonant rod assemblies 20 .

[0119] It should be noted that, for two adjacent resonant rod assemblies 20 arranged in the same row or different rows, the two resonant rods 21 at the ends of the two adjacent resonant rod assemblies 20 can be connected and coupled through the second coupling rib 30, so as to facilitate the transmission of signals from one resonant rod assembly 20 to the other resonant rod assembly 20. Wherein, the filter housing 10 is provided with a fourth coupling window 124 for the second coupling rib 30 to pass through on the partition wall 12 between the two resonant rod assemblies 20. Wherein, 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 the two resonant rods 21 connected thereto; or, the second coupling rib 30 can be separately connected to the two resonant rods 21 connected thereto; this embodiment does not impose any restrictions on this. Wherein, the extension direction of the second coupling rib 30 can be in a straight line shape, can be in a bent shape, etc., and this embodiment does not impose any unique restrictions on the extension path of the second coupling rib 30.

[0120] For example, Figure 2 , Figure 3 As shown, in one example of the filter, the second resonant rod assembly 20b and the third resonant rod assembly 20c are arranged in columns 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 through the 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, which can promote the formation of the main signal transmission path.

[0121] By adopting the above solution, the adjacent resonant rod components 20 are located between the two resonant rods 21 at the end, and can be connected through 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 of the resonant rod components 20 to the resonant rod 21 on one side of the other resonant rod component 20, so that energy can be transmitted between adjacent resonant rod components 20. Based on this, it can be ensured that energy can be transmitted in sequence according to the preset signal transmission path, and pass through each resonant rod 21 of each resonant rod component 20 in sequence, so as to ensure the performance of the filter.

[0122] See also Figure 2 , Figure 3 , Figure 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.

[0123] 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 located at the ends of at least one group of adjacent resonant rod assemblies 20. In this case, the first coupling window 121 and the fourth coupling window 124 may be provided in a superimposed manner, that is, the first coupling window 121 and the fourth coupling window 124 may be combined into a common coupling window.

[0124] For example, Figure 2 , Figure 3 As shown, in an example of the filter, the isolation wall 12 is provided with a fourth coupling window 124 between the eighth resonant rod 21h and the ninth resonant rod 21i, and the fourth coupling window 124 allows the second coupling rib 30 to pass through it, so that the second coupling rib 30 can connect the eighth resonant rod 21h and the ninth resonant rod 21i, and the eighth resonant rod 21h and the ninth resonant rod 21i can be coupled via the second coupling rib 30. At the same time, the fourth coupling window 124 can also serve as the first coupling window 121. In this case, the fourth coupling window 124 can directly couple the eighth resonant rod 21h and the ninth resonant rod 21i that are arranged opposite to each other. That is, the eighth resonant rod 21h and the ninth resonant rod 21i can be coupled through the second coupling rib 30 passing through the fourth coupling window 124, or can be directly coupled through the fourth coupling window 124 that serves as a common coupling window, thereby enhancing coupling.

[0125] By adopting the above scheme, when at least one group of adjacent resonant rod components 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, on the basis of ensuring that the required coupling relationship can be established between the two resonant rods 21 and the required coupling strength is obtained, the number of coupling windows between the two resonant rods 21 can be effectively simplified, and the structural strength of the partition wall 12 can be effectively guaranteed, so as to improve the overall structural strength of the filter and reduce the difficulty of processing the filter.

[0126] 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.

[0127] See also Figure 2 , Figure 3 In some embodiments of the present application, the filter further includes a third coupling rib 40, which is connected between two resonant rods 21 of adjacent resonant rod assemblies 20, and is used to cross-couple the two resonant rods 21 of adjacent resonant rod assemblies 20.

[0128] It should be noted that the third coupling rib 40 is connected between two resonant rods 21 of adjacent resonant rod assemblies 20, so that the two resonant rods 21 form a cross coupling. The "connection" may 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 may 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 may be integrally connected to both resonant rods 21 connected thereto; or, the third coupling rib 40 may be separately connected to both resonant rods 21 connected thereto; this is not limited in this embodiment. The extension direction of the third coupling rib 40 may be in a straight line shape or a bending shape, etc., which is not limited in this embodiment.

[0129] The isolation wall 12 of the filter housing 10 may be provided with a third coupling window 123 between two resonance rods 21 connected by the third coupling rib 40 , and the third coupling window 123 may be used for the third coupling rib 40 to pass through.

[0130] 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 the adjacent resonant rod assembly 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 assembly 20, the third coupling rib 40 cannot cross-couple the two resonant rods 21 connected thereto, which is not allowed.

[0131] Of course, the two resonant rods 21 forming the cross coupling may be arranged relative to each other or may not be arranged relative to each other, and this embodiment does not limit this.

[0132] For example, Figure 2 , Figure 3 As shown, in an example of the filter, the isolation wall 12 is provided with a third coupling window 123, and the third coupling window 123 is located between the eighth resonance rod 21h and the tenth resonance rod 21j. A third coupling rib 40 is provided between the eighth resonance rod 21h and the tenth resonance rod 21j, and the third coupling rib 40 is passed through the third coupling window 123 and connects the eighth resonance rod 21h and the tenth resonance rod 21j, so that the eighth resonance rod 21h and the tenth resonance rod 21j form a cross coupling. Based on this, the eighth resonance rod 21h can transmit energy to the tenth resonance rod 21j via the ninth resonance rod 21i, and can also directly transmit energy to the tenth resonance rod 21j through the third coupling rib 40. The two paths between the eighth resonance rod 21h and the tenth resonance rod 21j have a phase difference of 180 degrees at the high end of the passband, so that a transmission zero point can be formed at the high end of the passband.

[0133] By adopting the above scheme, the two resonant rods 21 of the adjacent resonant rod assemblies 20 can be connected and cross-coupled through the third coupling ribs 40. There is a main signal transmission path for transmitting energy in sequence through other resonant rods 21, and a direct signal transmission path for directly transmitting energy through the third coupling ribs 40 between the two resonant rods 21 connected by the third coupling ribs 40. The two transmission paths will have a phase difference of 180 degrees in the filter passband, so that a transmission zero point can be formed in the filter passband, so that the filter can form a multi-zero point scheme through the formed transmission zero point combined with other zero points, so as to effectively enhance the out-of-band suppression effect and filtering effect of the filter, so that the filter can meet the high selectivity requirements. In addition, since the third coupling ribs 40 have a simple structure, the two resonant rods 21 of the adjacent resonant rod assemblies 20 can be connected and cross-coupled through the third coupling ribs 40. Therefore, compared with the existing filter, it can further save coupling rods and other components, thereby effectively simplifying the structure of the filter, which can help the filter to be more concise, lighter and smaller.

[0134] See also Figure 2 , Figure 3 , Figure 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.

[0135] It should be noted that the isolation wall 12 may be provided with both a first coupling window 121 and a 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 arranged to overlap, that is, the first coupling window 121 and the third coupling window 123 may be combined into a common coupling window.

[0136] For example, Figure 2 , Figure 3As shown, in an example of the filter, the isolation wall 12 is provided with a third coupling window 123 between the eighth resonant rod 21h and the tenth resonant rod 21j, and the third coupling window 123 allows the third coupling rib 40 to pass through it, so that the third coupling rib 40 can connect the eighth resonant rod 21h and the tenth resonant rod 21j, and the eighth resonant rod 21h and the tenth resonant rod 21j can be cross-coupled through the third coupling rib 40. At the same time, the third coupling window 123 can also serve as the first coupling window 121. At this time, the third coupling window 123 can directly couple the eighth resonant rod 21h and the tenth resonant rod 21j that are arranged opposite to each other. That is, the eighth resonant rod 21h and the tenth resonant rod 21j can be cross-coupled through the third coupling rib 40 passing through the third coupling window 123, or can be directly coupled through the third coupling window 123 that is a common coupling window, thereby enhancing coupling.

[0137] By adopting the above scheme, 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, the number of coupling windows between the two resonant rods 21 can be effectively simplified on the basis of ensuring that the required cross-coupling relationship can be established between the two resonant rods 21 and the required coupling strength is obtained, and the structural strength of the isolation wall 12 is effectively guaranteed, so that the overall structural strength of the filter can be improved, and the processing difficulty of the filter can be reduced.

[0138] 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.

[0139] See also Figure 2 , Figure 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 having a first end 51 and a second end 52 relative to each other, the first end 51 being connected to the resonant rod 21 of one of the resonant rod assemblies 20, and the second end 52 being connected between two adjacent resonant rods 21 of another resonant rod assembly 20.

[0140] 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.

[0141] It should also be noted that the second end 52 is connected between two adjacent resonant rods 21 of another resonant rod assembly 20, and the second end 52 may be located in the middle of the two resonant rods 21, or the second end 52 may be relatively close to one of the resonant rods 21 and relatively far away from the other resonant rod 21. Figure 2 , Figure 3 As shown, the second end 52 is connected between the seventh resonance rod 21g and the eighth resonance rod 21h, and the second end 52 is disposed relatively close to the eighth resonance rod 21h.

[0142] It should also be noted that one end of the fourth coupling rib 50 is a first end 51, and the first end 51 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, and the second end 52 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. Therefore, 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 respectively 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, the two 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 be formed between the three resonant rods 21 connected to the fourth coupling rib 50, and the two transmission paths can have a phase difference of 180 degrees in the filter passband, so that a transmission zero point can be formed 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, so as to effectively enhance the out-of-band suppression effect and filtering effect of the filter.

[0143] The fourth coupling rib 50 may be integrally connected to the structure connected thereto or may be separately connected thereto, which is not limited in this embodiment. The fourth coupling rib 50 may extend in a straight line or in a bent shape, etc., which is not limited in this embodiment.

[0144] For example, Figure 2 , Figure 3 As shown, in an example of the filter, the filter is provided with a fourth coupling rib 50, the first end 51 of the fourth coupling rib 50 is connected to the tenth resonance rod 21j, and the second end 52 of the fourth coupling rib 50 is connected to the first coupling rib 22 between the seventh resonance rod 21g and the eighth resonance rod 21h. Based on this, the eighth resonance rod 21h can generate cross-coupling with the tenth resonance rod 21j via the fourth coupling rib 50, and the seventh resonance rod 21g can generate cross-coupling with the tenth resonance rod 21j via the fourth coupling rib 50. In this way, the seventh resonance rod 21g can transmit energy to the tenth resonance rod 21j via the eighth resonance rod 21h and the fourth coupling rib 50 in sequence, and can also transmit energy directly to the tenth resonance rod 21j via the fourth coupling rib 50. There are two transmission paths between the seventh resonance rod 21g, the eighth resonance rod 21h and the tenth resonance rod 21j, and these two transmission paths have a phase difference of 180 degrees at the high end of the filter passband, so that a transmission zero point can be formed at the high end of the filter passband.

[0145] By adopting the above scheme, between adjacent resonant rod assemblies 20, the resonant rod 21 of one of the resonant rod assemblies 20 can be connected through 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 through 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, so that a transmission zero point can be formed in the filter passband, so that the filter can form a multi-zero point scheme through the formed transmission zero point combined with other zero points, so as to effectively enhance the out-of-band suppression effect and filtering effect of the filter, so that the filter can meet the high selectivity requirements. Furthermore, 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 two adjacent resonant rods 21 of another resonant rod assembly 20 directly via the fourth coupling rib 50. Therefore, compared with the existing filter, coupling rods and other components can be further saved, and the number of coupling ribs can be saved compared with the solution of "causing one resonant rod 21 to cross-couple with the other two resonant rods 21 via two third coupling ribs 40", thereby effectively simplifying the structure of the filter and making the filter smaller, simpler and lighter.

[0146] See also Figure 2 , Figure 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.

[0147] It should be noted that at least one group of adjacent resonant rod components 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 to at least one third coupling rib 40 are two of the three resonant rods 21 connected to 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.

[0148] For example, Figure 2 , Figure 3As shown, in an example of the filter, the eighth resonant rod 21h and the tenth resonant rod 21j are connected to form a cross coupling through the third coupling rib 40, and the seventh resonant rod 21g, the eighth resonant rod 21h and the tenth resonant rod 21j are connected through the fourth coupling rib 50. Since the object connected to the third coupling rib 40 and the object 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 overlapped, 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 generate cross-coupling with the tenth resonant rod 21j via the common coupling ribs, and the eighth resonant rod 21h can generate cross-coupling with the tenth resonant rod 21j via the common coupling ribs. Combined with the main transmission paths of the signals 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 transmit energy to the tenth resonant rod 21j via the eighth resonant rod 21h and the common coupling ribs, and can also directly transmit energy to the tenth resonant rod 21j via the common coupling ribs, 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 point 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, and can also directly transfer energy to the tenth resonant rod 21j via the common 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. In addition, although the seventh resonant rod 21g can transfer energy to the tenth resonant rod 21j via the eighth resonant rod 21h and the ninth resonant rod 21i, and can also parasitically couple to the tenth resonant rod 21j via the common coupling rib, the shortest path and the longest path between the seventh resonant rod 21g and the tenth resonant rod 21j do not meet the reverse condition, and a transmission zero cannot be generated. 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 can form two transmission zeros at the high end of the passband.

[0149] By adopting the above solution, a third coupling rib 40 and a fourth coupling rib 50 are provided between adjacent resonant rod assemblies 20, and when the object connected to the third coupling rib 40 and the object 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 to overlap, so that the third coupling rib 40 and the fourth coupling rib 50 are combined into a common coupling rib. Based on this, on the basis of ensuring the realization of multiple zero points, the number of coupling ribs provided between adjacent resonant rod assemblies 20 can be effectively simplified, the structure of the filter can be effectively simplified, and the space required for the internal structure of the filter can be effectively saved, so that the filter can be made simpler and lighter.

[0150] 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.

[0151] See also Figure 2 , Figure 3 In some embodiments of the present application, the third coupling rib 40 is arranged to extend in a curve.

[0152] By adopting the above scheme, 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.

[0153] See also Figure 2 , Figure 3 , Figure 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 limiting and mounting the corresponding end of the third coupling rib 40 therein.

[0154] 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 mounting groove 216, and the corresponding end of the third coupling rib 40 can be limitedly mounted in the mounting groove 216. For example, Figure 2 , Figure 3 , Figure 5 As shown, in an example of the filter, the tenth resonance rod 21 j is provided with a mounting groove 216 , and the end of the third coupling rib 40 close to the tenth resonance rod 21 j is limitedly mounted in the mounting groove 216 .

[0155] By adopting the above scheme, at least one resonant rod 21 connected to the third coupling rib 40 can be installed by limiting and positioning 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 it can be beneficial to ensure and improve the stability and reliability of the third coupling rib 40 after installation, and it can also be beneficial to ensure and enhance the coupling reliability and coupling strength between the third coupling rib 40 and the resonant rod 21 with the installation groove 216.

[0156] See also Figure 2 , Figure 3 , Figure 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 supporting portion 217 for supporting a corresponding end portion of the third coupling rib 40 .

[0157] 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 of the third coupling rib 40 can be mounted on the support portion 217, so that the corresponding end of the third coupling rib 40 is supported by the support portion 217. For example, Figure 2 , Figure 3 , Figure 5 As shown, in an example of the filter, the eighth resonant rod 21h is provided with a support portion 217, and the end of the third coupling rib 40 close to the eighth resonant rod 21h is installed on the support portion 217, so that the end of the third coupling rib 40 close to the eighth resonant rod 21h is supported by the support portion 217.

[0158] By adopting the above scheme, 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, and the reliability of the coupling connection between the third coupling rib 40 and the resonant rod 21 provided with the support portion 217 can also be guaranteed.

[0159] See also Figure 1 , Figure 2 , Figure 3 In some embodiments of the present application, the filter includes two signal transmission ends 60 installed on the filter housing 10, wherein one signal transmission end 60 is coupled to the resonant rod 21 of one resonant rod assembly 20, and the other signal transmission end 60 is coupled to the resonant rod 21 of the other resonant rod assembly 20. Among them, one signal transmission end 60 is used for inputting signals and energy, and the other signal transmission end 60 is used for outputting signals and energy.

[0160] 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 the resonant rods 21 of each resonant rod assembly 20, and gradually filter out and suppress the clutter signals and interference signals, and finally output the signal and energy through another signal transmission end 60 to complete the filtering operation of the filter.

[0161] See also Figure 1 , Figure 2 , Figure 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, and the inner conductor 61 passes through the coupling hole 218 and is coupled to the at least one resonant rod 21.

[0162] 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.

[0163] Correspondingly, the resonant rod assembly 20 coupled to the inner conductor 61 may be provided with a coupling hole 218, and the coupling hole 218 is provided correspondingly 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, or 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 limit this.

[0164] 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 and connected with at least one resonance rod 21 near the coupling hole 218 through the inner conductor 61. For example, when the coupling hole 218 is provided on the resonance rod 21 of the resonance rod assembly 20, the inner conductor 61 inserted into the coupling hole 218 can be coupled and connected with the resonance 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 resonance rod assembly 20, the inner conductor 61 inserted into the coupling hole 218 can be coupled and connected with the two resonance rods 21 located on both sides of the first coupling rib 22.

[0165] Since the assembly between the inner conductor 61 and the coupling hole 218 is simple and the coupling path therebetween is small, the coupling strength between the signal transmission end 60 and the corresponding resonant rod 21 can be effectively enhanced, and the bandwidth of the filter can be effectively expanded. The coupling hole 218 can be a through hole or a blind hole, and can be specifically set according to the coupling strength requirements. The length of the portion of the inner conductor 61 that penetrates the coupling hole 218 can be adjusted according to the coupling strength requirements.

[0166] For example, Figure 2 , Figure 3 As shown, in an example of the filter, one of the signal transmission ends 60 is arranged in alignment with the first resonance rod 21a, the first resonance rod 21a is provided with a coupling hole 218 arranged 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 resonance rod 21a, so that the signal transmission end 60 is coupled to the first resonance rod 21a. Similarly, 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 arranged 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 resonance rod 21j, so that the signal transmission end 60 is coupled to the tenth resonance rod 21j.

[0167] By adopting the above 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.

[0168] Furthermore, 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 types of materials, simplifying the structure of the filter, and facilitating the simplification and lightweight of the filter.

[0169] Furthermore, since the signal transmission end 60 can be directly inserted into 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 detachment 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.

[0170] See also Figure 1 , Figure 2 , Figure 3In some embodiments of the present application, the filter housing 10 includes a first plate 13 for mounting a 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.

[0171] 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 install the resonant rod assembly 20. The resonant rod assembly 20 can be connected to the first plate 13 through the connecting end 213 of the resonant rod 21, or can be connected to the first plate 13 through 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.

[0172] The plate on the side of the filter housing 10 opposite to 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, to the left, to the right, to the front or to the back, and this embodiment does not limit this.

[0173] The component of the filter housing 10 connected between the second plate 14 and the first plate 13 is a housing body 15, and the housing body 15 extends from the first plate 13 to the second plate 14. The housing body 15 may be in the shape of, but not limited to, a polygonal cylinder, a circular cylinder, or any other irregularly shaped cylinder, for example, Figure 1 , Figure 3 As shown, the shell body 15 is in a rectangular tube shape, and the shell body 15 includes a plurality of side walls 151 connected end to end in sequence, and adjacent side walls 151 can be connected in one piece or in separate pieces.

[0174] 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 .

[0175] Among them, Figure 1 , Figure 2 , Figure 3 As shown, in a possible implementation, 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 .

[0176] It should be noted that the second plate 14 can be a single-layer plate or a multi-layer plate, and the shell 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 independently formed relative to the shell body 15, and then separately connected to the shell body 15, so as to form the filter housing 10 by assembling with the shell body 15 and the second plate 14, and forming a closed inner cavity 11. This embodiment does not limit the specific separate connection method adopted between the shell body 15 and the first plate 13.

[0177] The shell body 15 is a metal part, the first plate 13 is a metal part, the second plate 14 can be a single-layer plate or a multi-layer plate, and at least the layer of the second plate 14 that participates in closing the inner cavity 11 is a metal part. Since the shell body 15 and at least one layer of the second plate 14 are integrally formed, the shell body 15 and the layer of the second plate 14 integrally formed therewith are made of the same material. Since 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.

[0178] By adopting the above scheme, 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, and then the first plate 13 and the shell body 15 are separately connected to assemble and form the filter housing 10, forming 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 process, effectively ensuring and improving the processing convenience of the second plate 14 and the shell body 15 and 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 by the isolation wall 12 and other structures 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.

[0179] In another possible implementation, 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 .

[0180] It should be noted that the second plate 14, the shell 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 a closed inner cavity 11. This embodiment does not limit the specific separate connection method used between the shell body 15 and the first plate 13, and the specific separate connection method used between the shell body 15 and the second plate 14.

[0181] The shell body 15 is a metal part, the first plate 13 is a metal part, the second plate 14 can be a single-layer plate or a multi-layer plate, and at least the layer of the second plate 14 that participates in closing the inner cavity 11 is a metal part. Since the second plate 14, the shell body 15 and the first plate 13 are connected in sequence, the material of the second plate 14, the material of the shell body 15 and the material of the first plate 13 can be the same or different.

[0182] By adopting the above scheme, the second plate 14, the shell body 15 and the first plate 13 can be independently formed first, and then connected in turn, and assembled to form the filter housing 10, forming a closed inner cavity 11. Based on this, the process of machining the entire filter housing 10 to form corresponding features can be greatly saved, thereby effectively reducing the process, effectively reducing the difficulty of processing the second plate 14, the shell body 15 and the first plate 13, effectively ensuring and improving the processing convenience of the second plate 14, the shell body 15 and the first plate 13, and 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 by the isolation wall 12 and other structures 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.

[0183] In another possible implementation, 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 .

[0184] It should be noted that the shell 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 independently formed relative to the shell body 15, and then separately connected to the shell body 15, so as to be assembled with the shell body 15 and the first plate 13 to form the filter housing 10, forming a closed inner cavity 11. This embodiment does not limit the specific separate connection method adopted between the shell body 15 and the first plate 13.

[0185] The shell body 15 is a metal part, the first plate 13 is a metal part, the second plate 14 can be a single-layer plate or a multi-layer plate, and at least the layer of the second plate 14 that participates in closing the inner cavity 11 is a metal part. Since 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. Since 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.

[0186] By adopting the above scheme, the shell body 15 and the first plate 13 can be integrally formed, and the second plate 14 can be independently formed relative to the shell body 15, and then the second plate 14 and the shell body 15 can be connected separately to assemble and form the filter housing 10, forming a closed inner cavity 11. Based on this, the assembly process between the shell body 15 and the first plate 13 can be effectively saved, thereby effectively reducing the process, and effectively ensuring and improving the processing convenience of the shell body 15 and the first plate 13 and the processing convenience of the second plate 14. In addition, when the second plate 14 is a multi-layer board, by firstly forming the second plate 14 separately, it is convenient for the second plate 14 to be processed to form an inner plate close to the shell body 15, especially to facilitate the second plate 14 to be processed in its inner plate to form a tuning part that can be deformed by force; and by then connecting the second plate 14 separately to the shell body 15, the risk of damage to the tuning part during processing and assembly can be effectively reduced; thereby improving the processing convenience and processing quality of the second plate 14.

[0187] See also Figure 2 , Figure 3 , Figure 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 , and the partition wall 12 is separately connected to the first plate 13 .

[0188] 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, shields irrelevant signals, prevents signal interference, and forms a complete and orderly signal transmission channel inside the filter.

[0189] The partition wall 12 can be independently formed relative to the first plate 13 and then separately connected to the first plate 13 to achieve stability and firmness relative to the first plate 13 and to reliably perform the isolation function. This embodiment does not limit the specific separate connection method between the partition wall 12 and the first plate 13.

[0190] 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 splitly 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 splitly connected to the first plate 13 to ensure that the resonant rod assembly 20 will not be interfered with or hindered 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.

[0191] See also Figure 2 , Figure 3 , Figure 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 .

[0192] It should be noted that, when the partition wall 12 is separately connected to the first plate 13, the partition wall 12 can be integrally connected (i.e., integrally formed) to the shell body 15, or the partition wall 12 can be integrally connected to the second plate 14. Even 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.

[0193] By adopting the above scheme, in the case where 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.

[0194] See also Figure 3 , Figure 4 , Figure 5 In some embodiments of the present application, the resonant rod assembly 20 is integrally formed from a sheet metal substrate.

[0195] By adopting the above scheme, the resonant rod assembly 20 can be integrally formed with 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.

[0196] Based on the above embodiments, the present application provides a specific example of a filter, wherein: Figure 1-Figure 6 is a structural diagram of the filter example. Figure 7 The topological structure diagram of the filter example is shown in Figure 2. Figure 8 The following is the simulation waveform of the filter example.

[0197] Specifically, a first resonant rod assembly 20a, a second resonant rod assembly 20b and a third resonant rod assembly 20c are provided in the filter housing 10. The first resonant rod assembly 20a is a sheet metal part integrally formed by 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 part integrally formed by 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, and 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, and the third resonant rod assembly 20c is arranged in the same row as the first resonant rod assembly 20a.

[0198] One of the signal transmission ends 60 is arranged in alignment with the first resonance rod 21a, and the first resonance rod 21a 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 first resonance rod 21a, so that the signal transmission end 60 is capacitively coupled with the first resonance rod 21a. Based on this, the signal transmission end 60 can transmit energy to the first resonance rod 21a.

[0199] The first resonant rod 21a and the second resonant rod 21b are connected via the first coupling rib 22. The first resonant rod 21a is provided with a third coupling member 215 extending toward the second resonant rod 21b. 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.

[0200] The second resonant rod 21b and the third resonant rod 21c are connected via 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. An 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.

[0201] 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, and 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.

[0202] The fourth resonant rod 21d and the fifth resonant rod 21e are connected via 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.

[0203] The fifth resonant rod 21e and the sixth resonant rod 21f are connected to each other through the first coupling rib 22. The fifth resonant rod 21e is provided with a third coupling member 215 extending toward the sixth resonant rod 21f. The sixth resonant rod 21f is provided with a third coupling member 215 extending toward the fifth resonant rod 21e. An 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.

[0204] The sixth resonant rod 21f and the seventh resonant rod 21g are connected via the first coupling rib 22. The sixth resonant rod 21f is provided with a third coupling member 215 extending toward the seventh resonant rod 21g. 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.

[0205] The isolation wall 12 of the filter housing 10 is provided with a first coupling window 121 between the second resonant rod 21b and the fifth resonant rod 21e, so that the second resonant rod 21b and the fifth resonant rod 21e can 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, and can also directly transmit energy to the fifth resonant rod 21e through the first coupling window 121. The two paths between the second resonant rod 21b and the fifth resonant rod 21e have a phase difference of 180 degrees at the low end and the high end of the passband, so that a transmission zero point can be formed at the low end and the high end of the passband.

[0206] The isolation wall 12 of the filter housing 10 is provided with a first coupling window 121 between the first resonant rod 21a and the sixth resonant rod 21f, so that the first resonant rod 21a and the sixth resonant rod 21f are opposite 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 directly transmit energy to the sixth resonant rod 21f through the first coupling window 121. The two paths between the first resonant rod 21a and the sixth resonant rod 21f have a phase difference of 180 degrees at both the low and high ends of the passband, thereby forming a transmission zero point 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.

[0207] 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. Based on this, the first resonant rod 21a can transmit energy to the seventh resonant rod 21g via the sixth resonant rod 21f, and can also directly transmit energy to the seventh resonant rod 21g through the first coupling window 121. The 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 point at the low end of the passband.

[0208] The seventh resonance rod 21g and the eighth resonance rod 21h are connected to each other through the first coupling rib 22. The seventh resonance rod 21g is provided with a third coupling member 215 extending toward the eighth resonance rod 21h. The eighth resonance rod 21h is provided with a third coupling member 215 extending toward the seventh resonance rod 21g. Inductive coupling is formed between the seventh resonance rod 21g and the eighth resonance rod 21h, so that the seventh resonance rod 21g can transfer energy to the eighth resonance rod 21h.

[0209] The isolation wall 12 of the filter housing 10 is provided with a fourth coupling window 124 between the eighth resonance rod 21h and the ninth resonance rod 21i. The fourth coupling window 124 is penetrated by a second coupling rib 30. The eighth resonance rod 21h and the ninth resonance rod 21i are connected via the second coupling rib 30. An inductive coupling is formed between the eighth resonance rod 21h and the ninth resonance rod 21i, so that the eighth resonance rod 21h can transfer energy to the ninth resonance rod 21i.

[0210] The ninth resonant rod 21i and the tenth resonant rod 21j are connected via 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.

[0211] The isolation wall 12 of the filter housing 10 is provided with a third coupling window 123 between the eighth resonant rod 21h and the tenth resonant rod 21j, and a common coupling rib (both the third coupling rib 40 and the fourth coupling rib 50) is passed 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, and the second end 52 of the fourth coupling rib 50 is arranged closer to the eighth resonant rod 21h. Based on this, the seventh resonant rod 21g can generate useful parasitic coupling with the tenth resonant rod 21j via the common coupling rib, and the eighth resonant rod 21h can generate cross coupling with the tenth resonant rod 21j via the common coupling rib. Combined with the main transmission path of the signal transmitted in sequence 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 transmit energy to the tenth resonant rod 21j via the eighth resonant rod 21h and the common coupling rib, and can also directly parasitically couple the energy to the tenth resonant rod 21j via the common 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 point at the high end of the filter passband. Similarly, the eighth resonant rod 21h can transmit energy to the tenth resonant rod 21j via the ninth resonant rod 21i, and can also directly transmit energy to the tenth resonant rod 21j via the common 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 point at the high end of the passband. Among them, although the seventh resonant rod 21g can transmit energy to the tenth resonant rod 21j via the eighth resonant rod 21h and the ninth resonant rod 21i, and can also be parasitically coupled to the tenth resonant rod 21j through the shared coupling ribs, the shortest path and the longest path between the seventh resonant rod 21g and the tenth resonant rod 21j do not meet the reverse condition and cannot generate a transmission zero point. 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 can form two transmission zero points at the high end of the passband.

[0212] Another signal transmission end 60 is arranged in opposition to the tenth resonance rod 21j, and the tenth resonance 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 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, and this embodiment does not limit this.

[0213] Therefore, the filter can reliably establish a coupling relationship between the two resonant rods 21 by respectively arranging the first coupling member 211 and the second coupling member 212 on the two resonant rods 21, 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 simplification and lightweight of the filter product, and reducing the material cost and manufacturing cost of the filter product.

[0214] The filter can also enable two resonant rods 21 of different resonant rod assemblies 20 to be relative and coupled through the first coupling window 121; can also enable two resonant rods 21 of different resonant rod assemblies 20 to be coupled through the second coupling rib 30; can also be connected between multiple resonant rods 21 of adjacent resonant rod assemblies 20 through third coupling ribs 40 and fourth coupling ribs 50, so that multiple resonant rods 21 of adjacent resonant rod assemblies 20 can generate cross coupling and useful parasitic coupling through the third coupling ribs 40 and fourth coupling ribs 50. Based on this, the filter can achieve a design of 10 cavities and 7 zero points, which can break through the number of zero points that can be achieved in 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 better filtering effects, 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 the existing filter, thereby further simplifying the structure of the filter and making the filter more concise and lighter.

[0215] Of course, based on the principles of the above embodiments, the embodiments of the present application can form more examples of filters by changing the topological structure of the filter, so that the filter can achieve more zero point design. For example, Fig. 9 A topological diagram of another filter example is shown below. Fig.10 for Fig. 9The simulation waveform of the filter example shown in Figure 2 is shown in Figure 2. Compared with the previous filter example, Fig. 9 The filter example shown 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 alignment with the tenth resonant rod 21j and the seventh resonant rod 21g. Based on the above adjustments, Fig. 9 The filter example shown can achieve a 10-cavity 8-zero design through a basically similar structure, which can further exceed 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 better filtering effects, and better meet the needs of miniaturized and highly selective filters.

[0216] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope 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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