Cavity filter

Abstract

The application discloses a cavity filter, which comprises a cavity, an upper cover plate, a plurality of tuning screws, an input joint and an output joint. The cavity is divided into a plurality of resonant cavities which are open upward, and a resonant body is arranged in each resonant cavity. The resonant body comprises a resonant rod and a resonant column which are integrally formed. The first end of the resonant rod is integrally formed with the side wall of the resonant cavity, the second end of the resonant rod is cross-connected with the resonant column, and the resonant column extends up and down in the resonant cavity. The upper cover plate is arranged on the upper side of the cavity. The plurality of tuning screws are arranged on the upper cover plate and respectively extend into the plurality of resonant cavities. The bottom end of the tuning screw faces the resonant rod and is spaced from the resonant rod up and down. One side of the tuning screw faces the resonant column and is spaced from the resonant column. The input joint and the output joint are arranged on the side wall of the cavity and are respectively connected with one of the plurality of resonant rods. The application can greatly reduce the types and quantity of materials, simplify the manufacturing process, improve the production efficiency and reduce the cost.

Description

Technical Field

[0001] This application relates to the field of filter technology, and in particular to a cavity filter. Background Technology

[0002] After years of development, civilian wireless communication technology has entered the 5G era, and filters are evolving towards miniaturization, low power consumption, and low cost. Current filters are large, expensive, and complex to manufacture, which has become a major obstacle to the miniaturization of wireless communication products.

[0003] A filter is a typical frequency selective device that can effectively suppress unwanted signals and allow useful signals to pass through. The performance of a filter directly affects the quality of a communication system and is a key component in modern micrometer wave and millimeter wave communication systems.

[0004] Existing cavity filters include several resonant rods, each consisting of a rod section and a disk section connected to the top of the rod section, and are formed by die stamping. The resonant rods are then fastened to the cavity using mounting screws. However, this type of cavity filter suffers from the following technical problems: a large variety and quantity of materials, complex assembly, low production efficiency, and high cost.

[0005] Therefore, it is necessary to improve and optimize the cavity filter in order to solve at least one of the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this application is to provide a cavity filter that helps to solve at least one of the technical problems existing in the background art.

[0007] To achieve the above objectives, this application provides a cavity filter, comprising:

[0008] A cavity is divided into several resonant cavities that are at least open to the top. A resonant body is provided inside the resonant cavity. The resonant body includes an integrally formed resonant rod and a resonant column. The first end of the resonant rod is integrally formed with the side wall of the resonant cavity, and the second end of the resonant rod is cross-connected with the resonant column. The resonant column extends vertically inside the resonant cavity.

[0009] The upper cover plate is fixedly installed on the upper side of the cavity;

[0010] A plurality of tuning screws are mounted on the upper cover plate and extend into a plurality of resonant cavities respectively. The bottom end of each tuning screw faces the resonant rod and is spaced vertically from the resonant rod. One side of each tuning screw faces the resonant column and is spaced from the resonant column.

[0011] An input connector and an output connector are mounted on the side wall of the cavity and are respectively connected to one of the plurality of resonant rods, forming a circuit between the input connector and the output connector.

[0012] Optionally, the cavity is formed by integral stamping or 3D printing.

[0013] Optionally, the resonant cavity has a first corner and a second corner arranged diagonally, the resonant rod extends from the first corner and toward the second corner, and the resonant column is close to the second corner.

[0014] Optionally, the resonant column extends horizontally along the second corner, and the second end of the resonant rod is connected to the inner corner of the resonant column.

[0015] Optionally, the resonant rod extends from the middle of the sidewall of the resonant cavity in the vertical direction, and the resonant rod is connected to the middle of the resonant column in the vertical direction.

[0016] Optionally, in the vertical direction, the top end of the sidewall of the resonant cavity extends upward beyond the resonator, and the bottom end of the sidewall of the resonant cavity extends downward beyond the resonator.

[0017] Optionally, some of the resonant cavities are downwardly open; the cavity filter further includes a lower cover plate, which is fixed to the lower side of the cavity and is spaced apart from the resonator.

[0018] Optionally, the bottom end of the cavity protrudes downward with a plurality of protruding pillars, the plurality of protruding pillars being integrally formed with the cavity, and the bottom surface of the protruding pillars being recessed to form a groove; the lower cover plate is formed with a plurality of through holes respectively adapted to the plurality of protruding pillars, and when the lower cover plate is placed on the cavity, the plurality of protruding pillars are respectively fitted into the plurality of through holes, and the lower ends of the plurality of protruding pillars extend out of the corresponding through holes and are folded outward by stamping to form a flange portion pressed onto the lower cover plate.

[0019] Optionally, the top of the cavity protrudes upward with several protruding pillars, which are integrally formed with the cavity. The top surface of each protruding pillar is recessed to form a groove. The upper cover plate has several through holes that are adapted to the protruding pillars. When the upper cover plate is placed on the cavity, the protruding pillars are respectively fitted into the several through holes, and the upper ends of the protruding pillars extend out of the corresponding through holes and are folded outward by stamping to form a flanged portion pressed onto the upper cover plate.

[0020] Optionally, the resonant rod connected to the input connector is connected to a first connecting arm, one end of which is integrally formed on the resonant rod, and the other end of which is connected to the input connector; the resonant rod connected to the output connector is connected to a second connecting arm, one end of which is integrally formed on the resonant rod, and the other end of which is connected to the output connector.

[0021] In this application, several resonators are integrally formed within the cavity, meaning the resonators are part of the cavity. The resonant rods and resonant columns of the resonators can replace the function of existing resonant rods. Since this application eliminates the need to assemble several resonant rods on the cavity using mounting screws, a single independent component of the cavity can replace the existing assembly structure of the cavity, several resonant rods, and several mounting screws. This significantly reduces the types and quantities of materials, simplifies the manufacturing process, improves production efficiency, and reduces costs. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the cavity filter according to an embodiment of this application.

[0023] Figure 2 This is an exploded structural diagram of the cavity filter according to an embodiment of this application.

[0024] Figure 3 This is a three-dimensional structural diagram of the cavity, input connector, and output connector in an embodiment of this application.

[0025] Figure 4 This is a top view of the cavity, input connector, and output connector of an embodiment of this application.

[0026] Figure 5 This is a three-dimensional structural diagram of the cavity filter in this embodiment of the application after the upper cover plate, lower cover plate, and other structures are hidden.

[0027] Figure 6 This is a cross-sectional schematic diagram of a partial structure of the cavity filter according to an embodiment of this application, wherein the protrusion has not yet been stamped. Detailed Implementation

[0028] To explain in detail the technical content, structural features, objectives and effects of this application, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0032] Please see Figures 1 to 6 This application discloses a cavity filter, including a cavity 10, a top cover 20, several tuning screws 30, an input connector 40, and an output connector 50. The cavity 10 is divided into several resonant cavities 11, each at least open upwards. A resonator 12 is disposed inside each resonator 11, and each resonator 12 includes an integrally formed resonant rod 13 and a resonant pillar 14. The first end of the resonant rod 13 is integrally formed with the sidewall of the resonant cavity 11, and the second end of the resonant rod 13 is cross-connected with the resonant pillar 14. The resonant pillar 14 extends vertically within the resonant cavity 11. The top cover 20 is fixedly mounted on the upper side of the cavity 10, ensuring that the signal is transmitted only within the cavity 10. The top cover 20 can be formed by stamping. Several tuning screws 30 are mounted on the upper cover plate 20 and extend into several resonant cavities 11. The bottom end of the tuning screw 30 faces the resonant rod 13 and is spaced vertically from the resonant rod 13. One side of the tuning screw 30 faces the resonant column 14 and is spaced from the resonant column 14. The tuning screws 30 can correct the frequency error caused by the tolerance of the cavity 10. The input connector 40 and the output connector 50 are mounted on the side wall of the cavity 10 and are respectively connected to one of the resonant rods 13. A loop is formed between the input connector 40 and the output connector 50, that is, the signal input to the cavity 10 through the input connector 40 is transmitted through the cavity 10 and then output from the output connector 50.

[0033] In this application, several resonators 12 are integrally formed in the cavity 10, meaning that the several resonators 12 are part of the cavity 10. The resonant rods 13 and resonant pillars 14 of the resonators 12 can replace the function of existing resonant rods. Since this application eliminates the need to assemble several resonant rods on the cavity 10 using mounting screws, only a single component, the cavity 10, can replace the existing assembly structure of a cavity, several resonant rods, and several mounting screws. This significantly reduces the types and quantities of materials, simplifies the manufacturing process, improves production efficiency, and reduces costs.

[0034] In some embodiments, the cavity 10 is formed by integral stamping or 3D printing.

[0035] In some embodiments, the resonant cavity 11 has a first corner 15 and a second corner 16 arranged diagonally, the resonant rod 13 extends from the first corner 15 and toward the second corner 16, and the resonant column 14 is close to the second corner 16.

[0036] Specifically, the resonant post 14 extends horizontally along the second corner 16, and the second end of the resonant rod 13 is connected to the inner corner of the resonant post 14, which helps to increase the area of ​​the resonant post 14 facing the tuning screw 30.

[0037] In a specific example, part of the resonant cavity 11 is cuboid in shape, and correspondingly, the resonant pillar 14 extends in a roughly L-shape (horizontal cross-section) along the second corner 16 in the horizontal direction. Part of the resonant cavity 11 is a cuboid with chamfered corners (the sharp corner of the second corner is cut off, or the sharp corners of the first and second corners are cut off), and correspondingly, the resonant pillar 14 extends in a roughly C-shape (horizontal cross-section) along the second corner 16 in the horizontal direction. Of course, the resonant pillar 14 is not limited to the above forms.

[0038] In some embodiments, the resonant rod 13 extends from the sidewall of the resonant cavity 11 at the middle in the vertical direction, and the resonant rod 13 is connected to the middle of the resonant column 14 in the vertical direction.

[0039] In some embodiments, in the vertical direction, the top end of the sidewall of the resonant cavity 11 extends upward beyond the resonator 12, and the bottom end of the sidewall of the resonant cavity 11 extends downward beyond the resonator 12, thereby preventing the resonator 12 from contacting the cover plate.

[0040] In some embodiments, a plurality of resonant cavities 11 are open downwards; the cavity filter further includes a lower cover plate 50, which is fixed to the lower side of the cavity 10 so that the signal is transmitted only within the cavity 10, and the lower cover plate 50 is spaced apart from the resonator 12. Specifically, the lower cover plate 50 can be formed by stamping.

[0041] Specifically, the bottom end of the cavity 10 has several protruding posts 17 extending downwards, and the protruding posts 17 are integrally formed with the cavity 10. The bottom surface of the protruding posts 17 is recessed to form a groove 171. The lower cover plate 50 has several through holes 51 that are adapted to the protruding posts 17. When the lower cover plate 50 is placed on the cavity 10, the protruding posts 17 are respectively fitted into the several through holes 51, and the lower ends of the protruding posts 17 extend out of the corresponding through holes 51 and are folded outwards by stamping to form a flanged part pressed onto the lower cover plate 50. Using the above-mentioned technical means, it is not necessary to provide a large number of screws to fasten the lower cover plate 50 and the cavity 10. It is sufficient to integrally form a number of protrusions 17 with grooves 171 on the cavity 10 and form a number of through holes 51 on the lower cover plate 50. When the lower cover plate 50 is assembled on the cavity 10, the lower cover plate 50 can be reliably fixed on the cavity 10 by stamping the lower ends of the protrusions 17. This can effectively reduce the quantity and types of materials for the cavity filter, simplify the assembly process, improve the efficiency of mass production, reduce manufacturing and material costs, and save manpower and resources.

[0042] In some embodiments, a plurality of protruding pillars 18 protrude upward from the top of the cavity 10, and the plurality of protruding pillars 18 are integrally formed with the cavity 10. The top surface of the protruding pillars 18 is recessed to form a groove 181. The upper cover plate 20 is formed with a plurality of through holes 21 that are adapted to the plurality of protruding pillars 18. When the upper cover plate 20 is placed on the cavity 10, the plurality of protruding pillars 18 are respectively fitted into the plurality of through holes 21, and the upper ends of the plurality of protruding pillars 18 extend out of the corresponding through holes 21 and are folded outward by stamping to form a flange portion pressed onto the upper cover plate 20. Using the above-mentioned technical means, it is not necessary to provide a large number of screws to fasten the upper cover plate 20 and the cavity 10. It is sufficient to integrally form a number of protrusions 18 with grooves 181 on the cavity 10 and form a number of through holes 21 on the upper cover plate 20. When the upper cover plate 20 is assembled on the cavity 10, the upper end of the protrusions 18 can be stamped to reliably fix the upper cover plate 20 on the cavity 10. This can effectively reduce the quantity and types of materials for the cavity 10 filter, simplify the assembly process, improve the efficiency of mass production, reduce manufacturing and material costs, and save manpower and resources.

[0043] In some embodiments, the resonant rod 13 connected to the input connector 40 is connected to a first connecting arm 191. One end of the first connecting arm 191 is integrally formed in the resonant rod 13, and the other end of the first connecting arm 191 is connected to the input connector 40, specifically by welding. The resonant rod 13 connected to the output connector 50 is connected to a second connecting arm 192. One end of the second connecting arm 192 is integrally formed in the resonant rod 13, and the other end of the second connecting arm 192 is connected to the output connector 50, specifically by welding. The arrangement of the first connecting arm 191 and the second connecting arm 192 facilitates connection to the input connector 40 and the output connector 50.

[0044] Specifically, the input connector 40 and the output connector 50 are PIN pins, but are not limited to this.

[0045] To facilitate understanding of this application, the assembly process of the cavity 10 filter in the example of this application is described below. It should be understood that the assembly order is not limited to the order of the following description.

[0046] The input connector 40 is installed on the side wall of the cavity 10 and welded to the first connecting arm 191;

[0047] The output connector 50 is installed on the side wall of the cavity 10 and welded to the second connecting arm 192;

[0048] The lower cover plate 50 is placed on the cavity 10. Several through holes 51 on the lower cover plate 50 are respectively fitted with several protrusions 17 at the bottom of the cavity 10. The lower ends of several protrusions 17 are punched to fold outward to form a flanged part that is pressed onto the lower cover plate 50, thereby reliably fixing the lower cover plate 50 on the cavity 10.

[0049] Install several tuning screws 30 on the upper cover plate 20;

[0050] The upper cover plate 20 is placed on the cavity 10. Several through holes 51 on the upper cover plate 20 are respectively fitted with several protrusions 18 at the top of the cavity 10. The upper ends of several protrusions 18 are punched to fold outward to form a flanged part pressed on the upper cover plate 20, thereby reliably fixing the upper cover plate 20 on the cavity 10.

[0051] Connect the input connector 40 and the output connector 50 to the vector network analyzer and correct the error by rotating the tuning screw 30.

[0052] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the scope of this application shall still fall within the scope of this application.

Claims

1. A cavity filter, characterized in that, include: A cavity is divided into several resonant cavities that are at least open to the top. A resonant body is provided inside the resonant cavity. The resonant body includes an integrally formed resonant rod and a resonant column. The first end of the resonant rod is integrally formed with the side wall of the resonant cavity, and the second end of the resonant rod is cross-connected with the resonant column. The resonant column extends vertically inside the resonant cavity. The upper cover plate is fixedly installed on the upper side of the cavity; A plurality of tuning screws are mounted on the upper cover plate and extend into a plurality of resonant cavities respectively. The bottom end of each tuning screw faces the resonant rod and is spaced vertically from the resonant rod. One side of each tuning screw faces the resonant column and is spaced from the resonant column. An input connector and an output connector are mounted on the side wall of the cavity and respectively connected to one of the plurality of resonant rods, forming a circuit between the input connector and the output connector; The resonant cavity has a first corner and a second corner arranged diagonally, the resonant rod extends from the first corner and toward the second corner, and the resonant column is close to the second corner.

2. The cavity filter according to claim 1, characterized in that, The cavity is formed by integral stamping or 3D printing.

3. The cavity filter according to claim 1, characterized in that, The resonant column extends horizontally along the second corner, and the second end of the resonant rod is connected to the inner corner of the resonant column.

4. The cavity filter according to claim 1, characterized in that, The resonant rod extends from the middle of the sidewall of the resonant cavity in the vertical direction, and the resonant rod is connected to the middle of the resonant column in the vertical direction.

5. The cavity filter according to claim 1, characterized in that, In the vertical direction, the top end of the sidewall of the resonant cavity extends upward beyond the resonator, and the bottom end of the sidewall of the resonant cavity extends downward beyond the resonator.

6. The cavity filter according to claim 1, characterized in that, Several of the resonant cavities are downwardly open; the cavity filter also includes a lower cover plate, which is fixed to the lower side of the cavity and is spaced apart from the resonator.

7. The cavity filter according to claim 6, characterized in that, The bottom end of the cavity protrudes downward with several protruding pillars, which are integrally formed with the cavity. The bottom surface of each protruding pillar is recessed to form a groove. The lower cover plate has several through holes that are adapted to the protruding pillars. When the lower cover plate is placed on the cavity, the protruding pillars are respectively fitted into the through holes, and the lower ends of the protruding pillars extend out of the corresponding through holes and are folded outward by stamping to form a flanged part pressed onto the lower cover plate.

8. The cavity filter according to claim 1, characterized in that, The top of the cavity protrudes upwards with several protruding pillars, which are integrally formed with the cavity. The top surface of each protruding pillar is recessed to form a groove. The upper cover plate has several through holes that are adapted to the protruding pillars. When the upper cover plate is placed on the cavity, the protruding pillars are respectively fitted into the through holes, and the upper ends of the protruding pillars extend out of the corresponding through holes and are folded outwards by stamping to form a flanged part pressed onto the upper cover plate.

9. The cavity filter according to claim 1, characterized in that, The resonant rod connected to the input connector is connected to a first connecting arm, one end of which is integrally formed on the resonant rod, and the other end of which is connected to the input connector; the resonant rod connected to the output connector is connected to a second connecting arm, one end of which is integrally formed on the resonant rod, and the other end of which is connected to the output connector.

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