Wave trap and cavity filter

Abstract

The wave trap comprises a shell, a central column, an insulating plate and a circuit board, the shell and the central column are independently formed, the shell is provided with an opening, the insulating plate covers the opening and forms a cavity together with the shell, at least part of the central column is located in the cavity, at least part of the central column is located outside the cavity, and the circuit board is arranged in the cavity. The circuit board is arranged above the insulating plate and is provided with a plurality of electronic elements; the wave trap and the cavity filter are simple in structure, high in signal quality and communication efficiency, good in consistency and high in practicability.

Description

Technical Field

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

[0002] Traditional traps are machined from rods, and the "deep" space and "narrow" processing efficiency in the cavity are low. In addition, the center column has a low yield, is easily deformed and bent, and has a poor diameter. It cannot be repaired or replaced individually, and automated batch processing cannot be achieved. The center column and the trap housing are an integrated structure. During electroplating, black plating lines or spots are easily generated on the bottom of the inner cavity, which are difficult to clean and repair, and require "hanging plating" treatment. The electroplating cost is two to three times that of "roller plating". Traditional structural traps have problems such as unstable signals and poor consistency when filtering out carrier signals of no interest, reducing receiving sensitivity and signal-to-noise ratio, and suppressing unnecessary frequency bands. They are also not very practical and have a complex structure.

[0003] In the prior art, in order to solve the problems of high material cost and high processing cost caused by the complex structure, different sizes and many types of materials of the wave trap, a discharge tube is added below the wave trap. However, this solution is prone to short circuit, and the discharge tube generates a lot of heat during continuous operation, which is not easy to dissipate, resulting in easy damage. The verticality of the central column is not easy to ensure verticality. At the same time, the discharge tube is not easy to replace after being damaged, and the maintenance process is complicated. There is also a problem of poor grounding effect, and it is impossible to release the abnormally large current (such as lightning strike) in time.

[0004] Therefore, it is necessary to provide a new notch filter and cavity filter to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a notch filter and a cavity filter with simple structure, good consistency and strong versatility.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A wave trap comprises a shell, a center column, an insulating plate and a circuit board, wherein the shell and the center column are independently formed, the shell has an opening, the insulating plate covers the opening and forms a cavity together with the shell, the center column is at least partially located in the cavity and at least partially located outside the cavity, the circuit board is arranged above the insulating plate, and the circuit board is equipped with a plurality of electronic components.

[0008] As a further improved technical solution of the utility model, the shell includes a base plate and a cylinder surrounding the circumference of the base plate, the base plate is provided with a through hole, one end of the center column is crimped to the through hole and fixedly connected to the base plate, and the center column is at least partially located in the through hole.

[0009] As a further improved technical solution of the utility model, the through hole includes a first hole portion and a second hole portion, the first hole portion is closer to the cavity than the second hole portion, and the aperture of the second hole portion is larger than the aperture of the first hole portion;

[0010] The center column includes a shaft portion and a riveting portion, wherein the shaft portion is at least partially located in the first hole portion, and the riveting portion is located in the second hole portion.

[0011] As a further improved technical solution of the utility model, the lower surface of the riveting part is flush with the lower surface of the bottom plate.

[0012] As a further improved technical solution of the present invention, the hole cross section of the first hole portion is adapted to the outer shape of the shaft portion, and the hole cross section of the second hole portion is a polygon.

[0013] As a further improved technical solution of the utility model, the insulating plate is provided with a through hole, and the central column passes through the through hole and is at least partially connected to the circuit board.

[0014] As a further improved technical solution of the utility model, the electronic component includes a discharge tube, and the discharge tube is fixed to the circuit board.

[0015] In order to achieve the above purpose, the utility model also adopts the following technical solutions:

[0016] A cavity filter comprises a connection port, an inductor coil and a wave trap as described in any one of the above items, wherein the inductor coil connects the wave trap and the connection port.

[0017] As a further improved technical solution of the utility model, the cavity filter also includes a first cavity and a second cavity, the trap is at least partially located in the first cavity, the connection port is at least partially located in the second cavity, and the inductor is at least partially located in the first cavity and at least partially located in the second cavity.

[0018] As a further improved technical solution of the utility model, the shell includes a cylinder, the cylinder is provided with a side hole for the inductor to pass through, and the inductor is at least partially located in the cavity.

[0019] Compared with the prior art, the wave trap and cavity filter of the utility model have the following beneficial effects: by forming the outer shell and the center column separately and then electroplating, the processing difficulty can be reduced and the electroplating efficiency can be improved; the center column is riveted to the bottom of the outer shell, and holes of different sizes are set at the bottom of the outer shell to improve the connection stability between the center column and the outer shell; under different frequencies or cavity depths, the length and diameter of the center column can be replaced without replacing the entire set of wave traps, which has strong versatility and low cost; the discharge tube is set on the circuit board so that it is electrically connected to the center column while ensuring the verticality of the center column, reducing the occurrence of short circuits, accelerating the heat dissipation of the discharge tube, and having a good grounding effect. The wave trap and cavity filter have a simple structure, high signal quality and communication efficiency, good consistency and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a wave trap according to a specific embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of a wave trap according to a specific embodiment of the utility model;

[0022] Figure 3 A specific embodiment of the utility model Figure 2 Schematic diagram of the enlarged structure of the A area in the middle;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of a wave trap according to a specific embodiment of the utility model;

[0024] Figure 5 It is a partial structural schematic diagram of a cavity filter of a specific embodiment of the utility model;

[0025] Figure 6 It is a partial cross-sectional structural schematic diagram of a cavity filter according to a specific embodiment of the utility model. DETAILED DESCRIPTION

[0026] The exemplary embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. If there are several embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments consistent with the present invention; on the contrary, they are merely examples of devices, products and / or methods that are consistent with some aspects of the present invention and are recorded in the claims of the present invention.

[0027] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the scope of protection of the present invention. The singular forms "a", "said" or "the" used in the specification and claims of the present invention are also intended to include plural forms, unless the context clearly indicates other meanings.

[0028] It should be understood that the words used in the specification and claims of the present invention, such as "first", "second" and similar words, do not indicate any order, quantity or importance, but are only used to distinguish the names of features. Similarly, words such as "one" or "an" do not indicate a quantitative limitation, but indicate the existence of at least one. Unless otherwise specified, words such as "front", "rear", "upper", "lower" and similar words appearing in the present invention are only for the convenience of description and are not limited to a specific position or a spatial orientation. Words such as "include" or "comprise" are an open-ended expression, meaning that the elements appearing before "include" or "comprises" include the elements appearing after "include" or "comprises" and their equivalents, which does not exclude that the elements appearing before "include" or "comprises" may also include other elements.

[0029] If “several” appears in the present invention, it means two or more.

[0030] See also Figures 1 to 6 As shown, an embodiment of the utility model discloses a cavity filter, including a connection port 7, an inductor 6 and a trap, wherein two ends of the inductor 6 are respectively connected to the trap and the connection port 7, and the outer periphery of the inductor 6 is covered with an insulating sheath.

[0031] See also Figure 1 and Figure 2 As shown, the wave trap includes a shell 1, a center column 2 and an insulating plate 3. The shell 1 has an upward opening 11. The center column 2 is fixedly assembled at the bottom of the shell 1. The insulating plate 3 covers the opening 11 and forms a cavity 10 together with the shell 1. The center column 2 is at least partially located in the cavity 10 and at least partially located outside the cavity 10. In this embodiment, the shell 1 and the center column 2 are independently formed. The shell 1 is formed by a mold. Compared with the bar turning process, the mold forming efficiency is higher, the consistency of the obtained shell 1 is more stable, the processing difficulty is reduced, and it is conducive to the dimensional accuracy control of the shell 1 and the center column 2; at the same time, for wave traps of different frequencies and cavity depths, full-band coverage can be achieved by replacing the length and diameter of the center column 2 without replacing the entire set of wave traps, which has strong versatility.

[0032] See also Figures 2 to 4As shown, the housing 1 includes a bottom plate 12 and a cylinder 13, the cylinder 13 surrounds the circumference of the bottom plate 12 and extends in a direction away from the bottom plate 12, the bottom plate 12 is provided with a through hole 121, one end of the center column 2 is crimped to the through hole 121 and at least partially located in the through hole 121, so that the center column 2 is fixedly connected to the bottom plate 12, and the other end of the center column 2 passes through the insulating plate 3 and extends out of the cavity 10. Further, the through hole 121 includes a first hole portion 1211 and a second hole portion 1212, wherein the first hole portion 1211 is closer to the cavity 10 relative to the second hole portion 1212, that is, the first hole portion 1211 is relatively located at the upper side in the figure, and the second hole portion 1212 is relatively located at the lower side, and the aperture of the second hole portion 1212 is larger than the aperture of the first hole portion 1211. The center column 2 includes a shaft portion 21 and a riveting portion 22. The center column 2 is riveted to the through hole 121 to form the riveting portion 22. The shaft portion 21 is at least partially located in the first hole portion 1211, and the riveting portion 22 is located in the second hole portion 1212. In this embodiment, a hydraulic press with a pressure of 0.5MPa to 1MPa is used to rivet the center column 2 to the bottom plate 12; further, the riveting portion 22 can be fixed to the bottom plate 12 by knurling, interference fit, thread, barb, welding, etc. In this way, the riveting portion 22 located on the lower side can achieve a reliable connection with the bottom plate 12 to prevent the center column 2 from loosening.

[0033] See also Figures 1 to 4 As shown, the lower surface of the riveting portion 22 is flush with the lower surface of the base plate 12 to improve the connection stability between the center column 2 and the housing 1, so that the verticality of the center column 2 always remains perpendicular to the base plate 12, thereby ensuring communication efficiency.

[0034] Furthermore, the cross section of the center column 2 can be circular, polygonal or other shapes, and the cross section of the first hole portion 1211 is adapted to the shape of the shaft portion 21 of the center column 2; specifically, in this embodiment, the cross section of the center column 2 is circular, and the cross section of the first hole portion 1211 is also circular. The cross section of the second hole portion 1212 can also be circular, polygonal or other shapes, as long as its aperture is larger than the aperture of the first hole portion 1211; in this embodiment, the cross section of the second hole portion 1212 is polygonal, specifically hexagonal, and after the center column 2 is riveted to the through hole 121, the riveting portion 22 fills the second hole portion 1212, forming a shape adapted to the second hole portion 1212. Setting it as a polygon can prevent the center column 2 from rotating around the axis, and has better connection stability.

[0035] See also Figure 2 , Figure 4 and Figure 6As shown, the insulating plate 3 completely covers the opening 11 of the housing 1, and the insulating plate 3 is provided with a through hole 31, and the central column 2 extends out of the cavity 10 through the through hole 31. The wave trap of this embodiment also includes a circuit board 4, which is arranged above the insulating plate 3, and the central column 2 is at least partially connected to the circuit board 4. The circuit board 4 is equipped with a number of electronic components 5, that is, at least the part of the central column 2 extending out of the cavity 10 is connected to the circuit board 4, so that the central column 2 is electrically connected to the electronic components 5 on the circuit board 4. Further, the electronic component 5 includes a discharge tube, and the discharge tube is fixed to the circuit board 4, specifically, it can be fixed to the upper surface or the lower surface of the circuit board 4. In this way, the central column 2 is electrically connected to the discharge tube, and the abnormally large current generated can be released in time, and the heat can be dissipated in time, and it is not easy to be damaged.

[0036] See also Figure 5 and Figure 6 As shown, the cavity filter also includes a first cavity 101 and a second cavity 102, the first cavity 101 is connected to the second cavity 102, the wave trap is at least partially located in the first cavity 101, the connection port 7 is at least partially located in the second cavity 102, and the inductor 6 is at least partially located in the first cavity 101 and at least partially located in the second cavity 102. Further, the circuit board 4 covers the first cavity 101 and the second cavity 102, which can not only protect the structural components in the first cavity 101 and the second cavity 102, but also improve the connection reliability between the components. The connection port 7 of this embodiment is an antenna connection port.

[0037] See also Figure 1 , Figure 5 and Figure 6 As shown, the cylinder 13 is provided with a side hole 131 for the inductor 6 to pass through, and the inductor 6 is at least partially located in the cavity 10. The insulating sheath material covering the inductor 6 is insulating plastic. In this embodiment, the main component of the insulating plastic can be polyethylene terephthalate (PET for short), polytetrafluoroethylene (PTFE for short) or tetrafluoroethylene-hexafluoropropylene copolymer (FEP for short). The connection port 7 is exposed to the outside for external connection. The main rod 71 of the connection port 7 at least partially extends to the second cavity 102 and is connected to the inductor 6. The cavity filter of this embodiment can prevent short and strong sudden currents. The inductor 6 can block the passage of high-frequency currents, while having little effect on low-frequency currents, thereby filtering out high-frequency noise and clutter in the power supply or signal, improving the stability of the circuit and the purity of the signal.

[0038] In summary, compared with the prior art, the wave trap and cavity filter of the utility model have the following advantages: by forming the shell 1 and the center column 2 independently and then electroplating them, the processing difficulty can be reduced and the electroplating efficiency can be improved; the center column 2 is riveted to the bottom of the shell 1, and holes of different sizes are set at the bottom of the shell 1 to improve the connection stability between the center column 2 and the shell 1; under different frequencies or cavity depths, the length and diameter of the center column 2 can be replaced without replacing the entire set of wave traps, which has strong versatility and low cost; the discharge tube is set on the circuit board 4, so that it is electrically connected to the center column 2, while ensuring the verticality of the center column 2, reducing the occurrence of short circuits, accelerating the heat dissipation of the discharge tube, and having a good grounding effect. The wave trap and cavity filter have a simple structure, high signal quality and communication efficiency, good consistency and strong practicality.

[0039] The above implementation modes are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or make equivalent substitutions to the present invention, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A notch filter, characterized in that: The invention comprises a shell (1), a central column (2), an insulating plate (3) and a circuit board (4); the shell (1) and the central column (2) are independently formed, the shell (1) has an opening (11), the insulating plate (3) covers the opening (11) and forms a cavity (10) together with the shell (1), the central column (2) is at least partially located inside the cavity (10) and at least partially located outside the cavity (10), the circuit board (4) is arranged above the insulating plate (3), and the circuit board (4) is equipped with a plurality of electronic components (5).

2. The wave trap according to claim 1, characterized in that: The housing (1) comprises a bottom plate (12) and a cylinder (13) surrounding the circumference of the bottom plate (12); the bottom plate (12) is provided with a through hole (121); one end of the center column (2) is crimped into the through hole (121) and fixedly connected to the bottom plate (12); and the center column (2) is at least partially located in the through hole (121).

3. The wave trap according to claim 2, characterized in that: The through hole (121) comprises a first hole portion (1211) and a second hole portion (1212), the first hole portion (1211) being closer to the cavity (10) than the second hole portion (1212), and the aperture of the second hole portion (1212) being larger than the aperture of the first hole portion (1211); The central column (2) comprises a shaft portion (21) and a riveting portion (22), wherein the shaft portion (21) is at least partially located in the first hole portion (1211), and the riveting portion (22) is located in the second hole portion (1212).

4. The wave trap according to claim 3, characterized in that: The lower surface of the riveting portion (22) is flush with the lower surface of the bottom plate (12).

5. The wave trap according to claim 3, characterized in that: The hole cross section of the first hole portion (1211) is adapted to the outer shape of the shaft portion (21), and the hole cross section of the second hole portion (1212) is polygonal.

6. The wave trap according to claim 2, characterized in that: The insulating plate (3) is provided with a through hole (31), and the central column (2) passes through the through hole (31) and is at least partially connected to the circuit board (4).

7. The wave trap according to claim 1, characterized in that: The electronic component (5) comprises a discharge tube, and the discharge tube is fixed to the circuit board (4).

8. A cavity filter, characterized in that: It comprises a connection port (7), an inductor (6), and a trap according to any one of claims 1 to 7, wherein the inductor (6) connects the trap and the connection port (7).

9. The cavity filter according to claim 8, characterized in that: The cavity filter further comprises a first cavity (101) and a second cavity (102), the wave trap is at least partially located in the first cavity (101), the connection port (7) is at least partially located in the second cavity (102), and the inductor (6) is at least partially located in the first cavity (101) and at least partially located in the second cavity (102).

10. The cavity filter according to claim 8, characterized in that: The housing (1) comprises a cylinder (13), the cylinder (13) being provided with a side hole (131) for the inductor (6) to pass through, and the inductor (6) is at least partially located in the cavity (10).

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