Filter and communication device

Abstract

The utility model relates to the technical field of communication, and provides a filter and communication equipment, the filter comprises a cavity, a capacitive coupling piece and a plurality of resonance pieces installed in the cavity, at least one resonance piece comprises a supporting part and a coupling part, the supporting part is installed on the inner bottom wall of the cavity, the coupling part is connected to the supporting part in a split mode, and the coupling part is installed on the supporting part. The capacitive coupling piece and the coupling part of one resonance piece are integrally formed, and the free end of the capacitive coupling piece and at least one other resonance piece are arranged in a spaced mode. In the filter and the communication equipment provided by the utility model, the capacitive coupling piece and the coupling part of one resonant piece are integrally formed, the capacitive coupling piece does not need to be additionally mounted in the cavity by using an insulating clamping seat, the assembling operation between the capacitive coupling piece and the resonant piece is not needed, and the assembling operation between the insulating clamping seat and the cavity is not needed; and the types and the number of materials such as the insulating clamping seats are reduced, so that the assembling operation is simplified, and the assembling difficulty and the material cost of the filter are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of communication, in particular to a filter and communication equipment. Background Art

[0002] A filter is a device or circuit that processes signals. Its main function is to allow useful signals to pass through without attenuation as much as possible and to attenuate useless signals as much as possible. It is often used as a frequency selection device to select the communication signal frequency and filter out clutter or interference signals outside the communication signal frequency. It is widely used in mobile base stations to reduce intermodulation signal interference and generate high-quality communication signals. It is an indispensable device in electronic communication systems. The filter includes a cavity and multiple resonators installed in the cavity. Flying rods are used between the resonators to achieve capacitive coupling between the two resonators. The flying rods are fixed in the cavity through insulating holders.

[0003] With the construction of the new generation of communication systems, the requirements for the integration of filters are getting higher and higher. The miniaturization and lightweight of filters are the future application trend. However, the existing filters are relatively large in size and complex to assemble. Utility Model Content

[0004] The utility model aims to provide a filter and a communication device, aiming to solve the technical problems of the existing filter being large in size and complicated in assembly.

[0005] In a first aspect, the present application provides a filter, comprising a cavity, a capacitive coupling component, and a plurality of resonant components installed in the cavity, at least one of the resonant components comprising a supporting portion and a coupling portion, the supporting portion being installed on an inner bottom wall of the cavity, the coupling portion being separately connected to the supporting portion, the capacitive coupling component being integrally formed with the coupling portion of one of the resonant components, and the free end of the capacitive coupling component being spaced apart from at least one other resonant component.

[0006] In one of the embodiments, the cavity is provided with an isolation wall, the isolation wall has a first coupling window, the capacitive coupling component is inserted into the first coupling window to enable capacitive coupling between the resonant components located on both sides of the isolation wall, and the capacitive coupling component is spaced apart from the side wall of the first coupling window.

[0007] In one embodiment, the first coupling window is located on a side of the isolation wall away from the inner bottom wall of the cavity, and a distance between the inner bottom wall of the first coupling window and the capacitive coupling element is less than or equal to a thickness of the capacitive coupling element.

[0008] In one embodiment, the plurality of resonant components include a first resonant component, a second resonant component, a third resonant component and a fourth resonant component, the first resonant component and the fourth resonant component are located on one side of the isolation wall, the second resonant component and the third resonant component are located on the other side of the isolation wall, the capacitive coupling component is integrally formed with the coupling portion of the first resonant component, and the capacitive coupling component is spaced apart from the second resonant component and the third resonant component, respectively.

[0009] In one embodiment, the first resonant component and the second resonant component are spaced apart from each other along the thickness direction of the isolation wall, the third resonant component and the fourth resonant component are spaced apart from each other along the thickness direction of the isolation wall, the first coupling window is located between the first resonant component and the second resonant component, a line connecting the first resonant component and the third resonant component is a first line, and the capacitive coupling component is located on a side of the first line close to the second resonant component.

[0010] In one embodiment, the plurality of resonant components further include a fifth resonant component, a sixth resonant component, a seventh resonant component, an eighth resonant component, a ninth resonant component and a tenth resonant component, the fourth resonant component, the first resonant component, the fifth resonant component, the sixth resonant component, the second resonant component, the third resonant component, the seventh resonant component, the eighth resonant component, the ninth resonant component and the tenth resonant component are coupled in sequence, the isolation wall is provided with a second coupling window, the fourth resonant component and the third resonant component are inductively coupled through the second coupling window, the isolation wall is further provided with a third coupling window, the seventh resonant component is inductively coupled with the ninth resonant component and the tenth resonant component respectively through the third coupling window.

[0011] In one embodiment, the coupling portion and the capacitive coupling element are both sheet-like structures, and the coupling portion and the capacitive coupling element are integrally stamped; and / or the supporting portion and the cavity are integrally formed.

[0012] In one of the embodiments, a positioning portion is provided at one end of the support portion away from the inner bottom wall of the cavity, and the coupling portion is sleeved on the positioning portion and riveted to the support portion; or, the coupling portion is fixed to the support portion by laser welding.

[0013] In one embodiment, the cavity has a signal input port and a signal output port, the multiple resonators include a first resonator and a last resonator, the filter also includes a first inner conductor and a second inner conductor, the first inner conductor is riveted or laser welded to the first resonator through the signal input port, and the second inner conductor is riveted or laser welded to the last resonator through the signal output port.

[0014] In a second aspect, the present application provides a communication device, wherein the communication device comprises a filter as described in any one of the above items.

[0015] The filter and communication equipment provided by the utility model have the following beneficial effects: one of the resonant components is capacitively coupled to at least one other resonant component through a capacitive coupling component, the coupling portion of one of the resonant components is integrally formed with the capacitive coupling component, the capacitive coupling component does not need to be additionally installed in the cavity using an insulating holder, there is no need to perform assembly operations between the capacitive coupling component and the resonant component, there is no need to perform assembly operations between the insulating holder and the cavity, the types and quantities of materials such as the insulating holder are reduced, and a small assembly operation space and an increase in the cavity volume due to the addition of an insulating holder are avoided, the technical problems of the existing filters being large in volume and complex in assembly are solved, thereby simplifying the assembly operations and reducing the assembly difficulty and material costs of the filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the structure of a filter provided in an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the internal structure of the filter in FIG.

[0019] Figure 3 for Figure 2 Another view of the filter in ;

[0020] Figure 4 for Figure 2 A schematic diagram of connection between the first resonant element and the capacitive coupling element;

[0021] Figure 5 for Figure 2 S parameter simulation diagram of the filter in;

[0022] Figure 6 for Figure 1 Another schematic diagram of the internal structure of the filter in FIG.

[0023] Figure 7 for Figure 6 A schematic diagram of connection between the first resonant element and the capacitive coupling element;

[0024] Figure 8A schematic diagram of another internal structure of a filter provided in an embodiment of the utility model;

[0025] Fig. 9 A schematic diagram of another internal structure of a filter provided in an embodiment of the utility model.

[0026] Among them, the reference numerals in the figure are:

[0027] 100, cavity; 110, partition wall; 111, first coupling window; 112, second coupling window; 113, third coupling window; 120, signal input port; 130, signal output port; 140, coupling rib;

[0028] 200, capacitive coupling element; 210, first extension portion; 211, first bending portion; 220, second extension portion; 221, second bending portion;

[0029] 300, resonant element; 301, first resonant element; 302, second resonant element; 303, third resonant element; 304, fourth resonant element; 305, fifth resonant element; 306, sixth resonant element; 307, seventh resonant element; 308, eighth resonant element; 309, ninth resonant element; 310, tenth resonant element; 311, supporting portion; 312, coupling portion; 313, positioning portion;

[0030] 410, first inner conductor; 420, second inner conductor; 430, cover plate. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0033] In the description of the present invention, 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 invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] 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 the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 the present invention can be understood according to specific circumstances.

[0036] Embodiment 1

[0037] Combination Figure 1 , Figure 2 , Figure 6 , Figure 8 and Fig. 9 The filter provided in the present application includes a cavity 100, a capacitive coupling element 200, and a plurality of resonant elements 300 installed in the cavity 100. At least one resonant element 300 includes a support portion 311 and a coupling portion 312, the support portion 311 is installed on the inner bottom wall of the cavity 100, the coupling portion 312 is separately connected to the support portion 311, and the capacitive coupling element 200 is integrally formed with the coupling portion 312 of one of the resonant elements 300. The free end of the capacitive coupling element 200 is spaced apart from at least one other resonant element 300 so that the resonant elements 300 corresponding to the opposite ends of the capacitive coupling element 200 are capacitively coupled. In this embodiment, combined with Figure 2 and Figure 3, one of the resonant elements 300 is capacitively coupled with at least one other resonant element 300 through the capacitive coupling element 200, and the coupling portion 312 of one of the resonant elements 300 is integrally formed with the capacitive coupling element 200, with high connection reliability and high assembly consistency, and the capacitive coupling element 200 does not need to be installed in the cavity 100 using an additional insulating holder, and there is no need to perform assembly operations between the capacitive coupling element 200 and the resonant element 300, and there is no need to perform assembly operations between the insulating holder and the cavity 100, which reduces the types and quantities of materials such as the insulating holder, and also avoids the small assembly operation space and the increase in the volume of the cavity 100 caused by the addition of the insulating holder, thereby simplifying the assembly operation and reducing the assembly difficulty and material cost of the filter.

[0038] In this embodiment, combined with Figure 3 and Figure 4 The free end size of the capacitive coupling element 200 can be used to adjust the capacitive coupling strength, and the size modification optimization is more flexible, which reduces the difficulty of adjusting the capacitive coupling strength. At the same time, by modifying the size of the capacitive coupling element 200 instead of the size of the resonant element 300, the manufacturing difficulty is reduced, and it is conducive to using a universal resonant element 300, which is conducive to reducing the types of filter components.

[0039] Specifically, the staff can increase the coupling area by increasing the free end size of the capacitive coupling component 200 to improve the capacitive coupling strength, or increase the free end length of the capacitive coupling component 200 to shorten the coupling distance to improve the capacitive coupling strength; conversely, the staff can reduce the free end size of the capacitive coupling component 200 or shorten the free end length of the capacitive coupling component 200 to reduce the capacitive coupling strength.

[0040] In this embodiment, the resonant element 300 where the coupling portion 312 integrally formed with the capacitive coupling element 200 is located can be capacitively coupled with at least one other resonant element 300 through the capacitive coupling element 200. Generally, the free end of the capacitive coupling element 200 is spaced apart from another resonant element 300 or two other resonant elements 300, that is, the resonant element 300 where the coupling portion 312 integrally formed with the capacitive coupling element 200 is located can be capacitively coupled with another or two other resonant elements 300 through the capacitive coupling element 200. For example, the plurality of resonant elements 300 include a first resonant element 301, a second resonant element 302, and a third resonant element 303, the first resonant element 301 includes a supporting portion 311 and a coupling portion 312, the capacitive coupling element 200 and the coupling portion 312 of the first resonant element 301 are integrally formed, the free end of the capacitive coupling element 200 is spaced apart from the second resonant element 302, so that the first resonant element 301 is capacitively coupled to the second resonant element 302; or, the free end of the capacitive coupling element 200 is spaced apart from the second resonant element 302 and the third resonant element 303, so that the first resonant element 301 is capacitively coupled to the second resonant element 302 and the third resonant element 303, respectively.

[0041] In addition, compared to the need to assemble two flying rods for one resonator 300 to realize capacitive coupling with the other two resonators 300 respectively, in this embodiment, one resonator 300 can be capacitively coupled with the other two resonators 300 at the same time through a capacitive coupling element 200, which greatly reduces the number of components of the filter, and correspondingly reduces the number of connection operations and the size of the coupling window required for cross-coupling, which is conducive to the miniaturization and lightweight design of the filter.

[0042] In addition, compared to the integral molding of the capacitive coupling component 200 and the integrated resonant component, the resonant component 300 of the present application is a split structure, and the support portion 311 and the coupling portion 312 are manufactured separately. During manufacturing, it is only necessary to integrally mold the capacitive coupling component 200 and the coupling portion 312. During the integral molding process of the capacitive coupling component 200 and the coupling portion 312, there is no need to consider the support portion 311, thereby avoiding the influence of the support portion 311 on the integral molding process of the capacitive coupling component 200 and reducing the molding difficulty of the resonant component 300.

[0043] Furthermore, after the capacitive coupling component 200 and the coupling portion 312 are integrally formed into a whole, the capacitive coupling component 200 and the coupling portion 312 that have become a whole can be directly assembled separately to the support portion 311, thereby completing the assembly of the resonant component 300 and the capacitive coupling component 200. There is no need to use other structures or separate connection methods to assemble the capacitive coupling component 200 to the resonant component 300, thereby simplifying the assembly process.

[0044] In one embodiment, the coupling portion 312 and the capacitive coupling element 200 are both sheet-shaped structures, and the sheet-shaped coupling portion 312 and the capacitive coupling element 200 are small in size, which helps to reduce the volume of the resonant element 300 and the capacitive coupling element 200, thereby reducing the difficulty of assembling the capacitive coupling element 200 and avoiding interference between the capacitive coupling element 200 and other structures.

[0045] Specifically, the coupling portion 312 and the capacitive coupling element 200 are integrally stamped and formed, which improves the qualification rate and efficiency of the integral molding manufacturing and improves the manufacturing accuracy of the integral molding process.

[0046] It is understandable that in other embodiments, the coupling portion 312 and the capacitive coupling element 200 may be integrally formed by casting or integrally formed by injection molding and then plated with a metal layer, which is not limited here.

[0047] In one embodiment, the support portion 311 and the cavity 100 are integrally formed, and there is no need to machine threaded holes on the cavity 100 to connect the support portion 311 , which reduces the number of connection operations and helps to improve the assembly consistency between the support portion 311 and the cavity 100 .

[0048] It can be understood that in other embodiments, the coupling portion 312 and the supporting portion 311 can be connected by means of separate connection methods such as but not limited to bonding, welding, threaded connection, fastener connection, snap connection, crimping, plug-in connection, sleeve connection, interference fit, etc., which are not limited here.

[0049] In one embodiment, the material of the coupling portion 312 is different from the material of the supporting portion 311. Since both the supporting portion 311 and the coupling portion 312 are metal parts, the metal parts will expand or contract when the temperature in the cavity 100 of the filter changes. The material of the coupling portion 312 is set to be different from the material of the supporting portion 311, which can optimize the temperature drift of the filter. For example, the coupling portion 312 can be made of copper or iron, and the supporting portion 311 is made of aluminum, which is not specifically limited in this embodiment.

[0050] In one embodiment, the coupling portion 312 may be arranged concentrically with the supporting portion 311 , or the coupling portion 312 may adopt an eccentric or special-shaped structure, which may be selected according to actual needs.

[0051] In one embodiment, in combination Figure 6 and Figure 7, a positioning portion 313 is provided at one end of the support portion 311 away from the inner bottom wall of the cavity 100, and the coupling portion 312 is sleeved with the positioning portion 313 and riveted to the support portion 311. In this way, after the coupling portion 312 is sleeved with the positioning portion 313, the positioning portion 313 is pressed to compress and clamp the coupling portion 312, so that the coupling portion 312 is riveted and fixed to the support portion 311, ensuring that the position of the coupling portion 312 is stable during use. The coupling portion 312 can be quickly assembled by stamping, and no additional tooling is required to assist in clamping and fixing the coupling portion 312, and no screwing or laser step-by-step welding is required. The assembly efficiency is high, and all coupling portions 312 can be stamped and riveted synchronously at one time, further improving the assembly efficiency.

[0052] In another embodiment, the coupling portion 312 is fixed to the supporting portion 311 by laser welding, so that the coupling portion 312 and the supporting portion 311 can be installed at one time without adding solder or tightening screws, thereby saving material and assembly costs.

[0053] In some embodiments, in combination Figure 2 , Figure 6 , Figure 8 and Fig. 9 The cavity 100 is provided with a partition wall 110, and the partition wall 110 has a thickness direction X, a length direction Y and a height direction Z which are perpendicular to each other. The partition wall 110 has a first coupling window 111, and the capacitive coupling element 200 is inserted into the first coupling window 111, so that the resonant elements 300 located on both sides of the partition wall 110 are capacitively coupled. The capacitive coupling element 200 is spaced apart from the side wall of the first coupling window 111, that is, the capacitive coupling element 200 is installed on the partition wall 110 without the need for additional insulating card holders or fasteners, which reduces the types of materials and the number of assembly operations, is conducive to reducing the size of the first coupling window 111, reduces the processing amount and difficulty of the first coupling window 111, and also avoids the small internal operation space of the cavity 100 due to the addition of insulating card holders or fasteners, thereby reducing the assembly difficulty of the filter.

[0054] This embodiment does not make any specific requirements on the extension length of the capacitive coupling element 200. The capacitive coupling element 200 can extend from one side of the isolation wall 110 to the other side of the isolation wall 110 through the coupling window, can extend to the coupling window, or can be located entirely on one side of the isolation wall 110.

[0055] In one embodiment, in combination Figure 2 , Figure 6 , Figure 8 and Fig. 9, the first coupling window 111 is located on the side of the partition wall 110 away from the inner bottom wall of the cavity 100, and the interval between the inner bottom wall of the first coupling window 111 and the capacitive coupling element 200 is less than or equal to the thickness of the capacitive coupling element 200. In this way, the top of the first coupling window 111 is open, which is conducive to reducing the difficulty of processing the first coupling window 111, and the interval between the capacitive coupling element 200 and the inner bottom wall of the first coupling window 111 is small, which is conducive to reducing the size and processing amount of the first coupling window 111.

[0056] In one embodiment, in combination Figure 2 , Figure 6 , Figure 8 and Fig. 9 The multiple resonators 300 include a first resonator 301, a second resonator 302, a third resonator 303 and a fourth resonator 304. At least the first resonator 301 includes a support portion 311 and a coupling portion 312. The first resonator 301 and the fourth resonator 304 are located on one side of the partition wall 110, and the second resonator 302 and the third resonator 303 are located on the other side of the partition wall 110. The capacitive coupling element 200 is integrally formed with the coupling portion 312 of the first resonator 301, and the capacitive coupling element 200 is spaced from the second resonator 302 and the third resonator 303. The four resonators 300 are distributed on both sides of the partition wall 110 in pairs, and the arrangement is relatively regular, which is conducive to optimizing the cavity design and reducing the volume of the cavity 100. The partition wall 110 can prevent signal interference and improve the stability and clarity of signal transmission. The first resonant element 301 achieves capacitive cross coupling with the second resonant element 302 and the third resonant element 303 through the capacitive coupling element 200 to generate a transmission zero point.

[0057] Specifically, the first resonant element 301 and the second resonant element 302 are spaced apart and distributed along the thickness direction X of the partition wall 110 , so that the distance between them is short and the arrangement is compact, which is conducive to optimizing the cavity structure.

[0058] Specifically, the third resonant element 303 and the fourth resonant element 304 are spaced apart and distributed along the thickness direction X of the partition wall 110 , so that the distance between them is short and the arrangement is compact, which is conducive to optimizing the cavity structure.

[0059] Specifically, the first coupling window 111 is located between the first resonant component 301 and the second resonant component 302 , which increases the facing area of ​​the first resonant component 301 and the second resonant component 302 through the first coupling window 111 , thereby increasing the capacitive coupling strength between the two.

[0060] Specifically, combined Figure 3The connection line between the first resonant element 301 and the third resonant element 303 is the first connection line L, and the capacitive coupling element 200 is located on the side of the first connection line close to the second resonant element 302. On the one hand, it is beneficial to reduce the size of the entire capacitive coupling element 200, reduce the risk of interference with other structures, and reduce the difficulty of arrangement inside the cavity 100; on the other hand, the capacitive coupling element 200 does not pass through the first connection line L, and the first coupling window 111 does not need to be expanded to the first connection line L, which is beneficial to the design of reducing the first coupling window 111 and avoiding the first coupling window 111 being too large and prone to signal crosstalk.

[0061] In one embodiment, the connection line between the first resonator 301 and the fourth resonator 304 is parallel to the isolation wall 110, that is, the intervals between the first resonator 301 and the fourth resonator 304 and the isolation wall 110 are the same, so that the first resonator 301 and the fourth resonator 304 are arranged in order in the cavity 100, and the isolation interval between the first resonator 301 and the isolation wall 110 can be minimized as much as possible, which is conducive to the cavity arrangement design and the miniaturization design of the filter.

[0062] In one embodiment, the connecting line of the second resonant element 302 and the third resonant element 303 is parallel to the isolation wall 110, that is, the intervals between the second resonant element 302 and the third resonant element 303 and the isolation wall 110 are the same, so that the second resonant element 302 and the third resonant element 303 are arranged in order in the cavity 100, and the isolation interval between the second resonant element 302 and the isolation wall 110 can be minimized as much as possible, which is conducive to the cavity arrangement design and the miniaturization design of the filter.

[0063] In one embodiment, in combination Figure 2 and Figure 6 The capacitive coupling element 200 includes a first extension portion 210 and a second extension portion 220. One end of the first extension portion 210 and the second extension portion 220 are integrally formed on the coupling portion 312 of the first resonator 301. The free ends of the first extension portion 210 and the second extension portion 220 extend toward the second resonator 302 and the third resonator 303, respectively. The first extension portion 210 and the second extension portion 220 are relatively independent, which is conducive to the staff to separately adjust the capacitive coupling strength between different resonators 300, greatly reducing the difficulty and complexity of adjustment.

[0064] For example, the staff can adjust the capacitive coupling strength between the first resonator 301 and the second resonator 302 by adjusting the width dimension a of the free end of the first extension portion 210 or the extension length c of the first extension portion 210. For another example, the staff can adjust the capacitive coupling strength between the first resonator 301 and the third resonator 303 by adjusting the width dimension b of the free end of the second extension portion 220.

[0065] In one embodiment, in combination Figure 2 and Figure 6 The side of the first extension part 210 close to the second extension part 220 is attached to the second extension part 220, avoiding the generation of a gap between the first extension part 210 and the second extension part 220, which is conducive to reducing the overall size of the capacitive coupling part 200. At the same time, one side of the first extension part 210 is integrally attached to the second extension part 220, with a large attachment area and strong integrity, avoiding the capacitive coupling part 200 from shaking during use and causing changes in coupling strength, thereby improving the stability of product indicators.

[0066] In one embodiment, in combination Figure 2 and Figure 6 The side of the second extension part 220 close to the first extension part 210 is attached to the first extension part 210, which is beneficial to reducing the overall size of the capacitive coupling element 200. At the same time, the contact area between the second extension part 220 and the first extension part 210 is large, so that the first extension part 210 and the second extension part 220 have a strong bonding force and a strong integrity, which prevents the second extension part 220 from being suspended in the air, improves the position stability of the second extension part 220, and ensures the stability of the coupling strength between the first resonant element 301 and the third resonant element 303.

[0067] In some embodiments, in combination Figure 6 and Figure 7 The first extension portion 210 is bent at the end close to the second resonant member 302 to increase the coupling area between the first extension portion 210 and the second resonant member 302, and the coupling strength can be adjusted in a larger range, thereby improving the coupling sensitivity. At the same time, when the same coupling strength is met, the first extension portion 210 can reduce the width of the free end or reduce the extension length by being bent, which is conducive to reducing the size and volume of the first extension portion 210.

[0068] Specifically, a first bending portion 211 extending along the height direction Z is provided at the end of the first extension portion 210 close to the second resonator 302 , and one side surface of the first bending portion 211 faces the second resonator 302 , so that the coupling area between the first bending portion 211 and the second resonator 302 is maximized.

[0069] In some embodiments, in combination Figure 6 and Figure 7 The second extension part 220 is bent at the end close to the third resonant element 303 to increase the coupling area between the second extension part 220 and the third resonant element 303, and the coupling strength can be adjusted in a larger range to improve the coupling sensitivity. At the same time, when the same coupling strength is met, the second extension part 220 can be bent to reduce its extension length, avoid interference with other structures due to excessive length, and also help reduce the size and volume of the second extension part 220.

[0070] Specifically, a second bending portion 221 extending along the height direction Z is provided at the end of the second extension portion 220 close to the third resonator 303 , and one side surface of the second bending portion 221 faces the third resonator 303 , so that the coupling area between the second bending portion 221 and the third resonator 303 is maximized.

[0071] In this embodiment, the resonant element 300 connected to the capacitive coupling element 200 includes a support portion 311 and a coupling portion 312. Other resonant elements 300 may include a support portion 311 and a coupling portion 312 connected separately, or may be integrally formed, or may adopt other structural forms, which are not limited here. For example, any one of the second resonant element 302, the third resonant element 303, and the fourth resonant element 304 may include a support portion 311 and a coupling portion 312, or may be integrally formed.

[0072] In this embodiment, the multiple resonators 300 can be metal coaxial resonators independently of each other, or ceramic dielectric resonators, ceramic dielectric loaded resonators, sheet metal resonators, sheet resonators, etc. The present application does not limit the specific types of the resonators 300. In some embodiments, all resonators 300 have the same structure, including a separately connected support portion 311 and a coupling portion 312, so as to reduce the types of filter components and simplify the internal structure of the cavity 100.

[0073] In some embodiments, in combination Fig. 9 , the number of resonant elements 300 is four, the first resonant element 301, the fourth resonant element 304, the third resonant element 303 and the second resonant element 302 are coupled in sequence through the coupling ribs 140, and the first coupling window 111 is located between the first resonant element 301 and the second resonant element 302. In this way, the first resonant element 301, the fourth resonant element 304, the second resonant element 302 and the third resonant element 303 are coupled in sequence to form a main signal channel for signal transmission and filtering. The signal can pass through the first resonant element 301, the fourth resonant element 304, the second resonant element 302 and the third resonant element 303 in sequence along the main signal channel, or pass through the third resonant element 303, the second resonant element 302, the fourth resonant element 304 and the first resonant element 301 in sequence along the main signal channel. In the main signal channel, the first resonant element 301, the second resonant element 302 and the third resonant element 303 are non-cascaded, and the first resonant element 301 is capacitively cross-coupled with the second resonant element 302 through the first extension portion 210, and is capacitively cross-coupled with the third resonant element 303 through the second extension portion 220, thereby generating two transmission zeros in the passband.

[0074] It can be understood that in other embodiments, the filter further includes other resonant elements 300 .

[0075] In one embodiment, in combination Figure 8The filter further includes a fifth resonant component 305 and a sixth resonant component 306. The fourth resonant component 304, the first resonant component 301, the fifth resonant component 305, the sixth resonant component 306, the second resonant component 302 and the third resonant component 303 are coupled in sequence to form a main signal channel for signal transmission.

[0076] In another embodiment, in combination Figure 2 and Figure 5 The plurality of resonant elements 300 further include a fifth resonant element 305, a sixth resonant element 306, a seventh resonant element 307, an eighth resonant element 308, a ninth resonant element 309 and a tenth resonant element 310, and the fourth resonant element 304, the first resonant element 301, the fifth resonant element 305, the sixth resonant element 306, the second resonant element 302, the third resonant element 303, the seventh resonant element 307, the eighth resonant element 308, the ninth resonant element 309 and the tenth resonant element 310 are coupled in sequence.

[0077] Specifically, the isolation wall 110 is provided with a second coupling window 112, the fourth resonant element 304 and the third resonant element 303 are inductively cross-coupled through the second coupling window 112, and the first resonant element 301 is capacitively cross-coupled with the second resonant element 302 and the third resonant element 303 through the capacitive coupling element 200, thereby generating two transmission zeros in the passband.

[0078] Specifically, the first resonant element 301 is capacitively cross-coupled with the second resonant element 302 through the capacitive coupling element 200 , and the first resonant element 301 and the sixth resonant element 306 are inductively cross-coupled through the first coupling window 111 , thereby generating two transmission zeros in the passband.

[0079] Specifically, the isolation wall 110 is further provided with a third coupling window 113 , and the seventh resonator 307 is inductively cross-coupled with the ninth resonator 309 and the tenth resonator 310 respectively through the third coupling window 113 , thereby generating two transmission zeros in the passband.

[0080] Optionally, combined Figure 3 The seventh resonant element 307 is inductively cross-coupled with the ninth resonant element 309 via the coupling rib 140 .

[0081] In some embodiments, in combination Figure 1 and Figure 2 The cavity 100 has a signal input port 120 and a signal output port 130, and the multiple resonators 300 include a first resonator 300 and a last resonator 300. The filter also includes a first inner conductor 410 and a second inner conductor 420. The first inner conductor 410 is riveted or laser welded to the first resonator 300 through the signal input port 120, and the second inner conductor 420 is riveted or laser welded to the last resonator 300 through the signal output port 130.

[0082] Specifically, the first inner conductor 410 is riveted or laser welded to the support portion 311 of the first resonator 300 through the signal input port 120 , and the second inner conductor 420 is riveted or laser welded to the support portion 311 of the last resonator 300 through the signal output port 130 .

[0083] For example, the first inner conductor 410 and the second inner conductor 420 are respectively fixed to the support portion 311 of the corresponding resonator 300 by stamping and riveting, ensuring that the first inner conductor 410 and the second inner conductor 420 are in a stable position during use, and the first inner conductor 410 and the second inner conductor 420 can be quickly assembled by stamping, without the need for additional tooling to assist in clamping and fixing the first inner conductor 410 and the second inner conductor 420, without the need for screwing or laser welding step by step, and the assembly efficiency is high. For another example, the first inner conductor 410 and the second inner conductor 420 are respectively fixed to the support portion 311 of the corresponding resonator 300 by laser welding, so that the first inner conductor 410 and the second inner conductor 420 are installed in place at one time, without the need for steps such as adding solder or screwing, thereby saving material and assembly costs.

[0084] In some embodiments, in combination Figure 1 The filter further includes a cover plate 430. The cavity 100 has an opening. The cover plate 430 covers one end of the cavity 100 having the opening to form a closed cavity, realize a shielding function, and ensure that the signal in the cavity 100 will not leak.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A filter, characterized in that: The filter includes a cavity, a capacitive coupling component, and a plurality of resonant components installed in the cavity, at least one of the resonant components includes a supporting portion and a coupling portion, the supporting portion is installed on the inner bottom wall of the cavity, the coupling portion is separately connected to the supporting portion, the capacitive coupling component is integrally formed with the coupling portion of one of the resonant components, and the free end of the capacitive coupling component is spaced apart from at least one other resonant component.

2. The filter according to claim 1, characterized in that: The cavity is provided with an isolation wall, and the isolation wall has a first coupling window. The capacitive coupling component is arranged through the first coupling window to enable capacitive coupling between the resonant components located on both sides of the isolation wall. The capacitive coupling component is spaced apart from the side wall of the first coupling window.

3. The filter according to claim 2, characterized in that: The first coupling window is located on a side of the isolation wall away from the inner bottom wall of the cavity, and a distance between the inner bottom wall of the first coupling window and the capacitive coupling element is less than or equal to a thickness of the capacitive coupling element.

4. The filter according to claim 2, characterized in that: The multiple resonant components include a first resonant component, a second resonant component, a third resonant component and a fourth resonant component, the first resonant component and the fourth resonant component are located on one side of the isolation wall, the second resonant component and the third resonant component are located on the other side of the isolation wall, the capacitive coupling component and the coupling portion of the first resonant component are integrally formed, and the capacitive coupling component is spaced apart from the second resonant component and the third resonant component, respectively.

5. The filter according to claim 4, characterized in that: The first resonant component and the second resonant component are spaced apart and distributed along the thickness direction of the isolation wall, the third resonant component and the fourth resonant component are spaced apart and distributed along the thickness direction of the isolation wall, the first coupling window is located between the first resonant component and the second resonant component, a connecting line between the first resonant component and the third resonant component is a first connecting line, and the capacitive coupling component is located on a side of the first connecting line close to the second resonant component.

6. The filter according to claim 4, characterized in that: The plurality of resonant components further include a fifth resonant component, a sixth resonant component, a seventh resonant component, an eighth resonant component, a ninth resonant component and a tenth resonant component. The fourth resonant component, the first resonant component, the fifth resonant component, the sixth resonant component, the second resonant component, the third resonant component, the seventh resonant component, the eighth resonant component, the ninth resonant component and the tenth resonant component are coupled in sequence. The isolation wall is provided with a second coupling window. The fourth resonant component and the third resonant component are inductively coupled through the second coupling window. The isolation wall is also provided with a third coupling window. The seventh resonant component is inductively coupled to the ninth resonant component and the tenth resonant component respectively through the third coupling window.

7. The filter according to claim 1, characterized in that: The coupling part and the capacitive coupling element are both sheet-shaped structures, and the coupling part and the capacitive coupling element are integrally stamped and formed; And / or, the support portion and the cavity are integrally formed.

8. The filter according to claim 7, characterized in that: A positioning portion is provided at one end of the support portion away from the inner bottom wall of the cavity, and the coupling portion is sleeved on the positioning portion and riveted to be fixed to the support portion; Alternatively, the coupling portion is fixed to the supporting portion by laser welding.

9. The filter according to any one of claims 1 to 8, characterized in that: The cavity has a signal input port and a signal output port, the multiple resonators include a first resonator and a last resonator, the filter also includes a first inner conductor and a second inner conductor, the first inner conductor is riveted or laser welded to the first resonator through the signal input port, and the second inner conductor is riveted or laser welded to the last resonator through the signal output port.

10. A communication device, characterized in that: The communication device comprises a filter according to any one of claims 1 to 9.

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