Laser welding tuning sheet metal filter

Abstract

The invention discloses a laser welding tuning sheet metal filter, which relates to the technical field of communication, and comprises a filter box, a cavity is formed in the filter box, a plurality of resonators are arranged in the cavity, the plurality of resonators are distributed in an array, and connectors are arranged at two ends of the filter box. The resonators located on the two sides of the cavity are fixedly connected with the connectors at the two ends of the filter box respectively. According to the scheme, the whole cavity, the cover plate and the resonator are formed at a time through the high-precision stamping sheet metal technology, the precision and consistency of components are ensured, the number of assemblies is reduced through the design, the assembly error rate in the production process is reduced, the production efficiency is improved, and the production cost is reduced. The sheet metal filter is easier to integrate and debug in a communication system due to the simplified structure and the reduced number of components, the reliability and performance of the whole system are improved, and the development of the communication technology from 5G to future 6G and even 7G can be supported.

Description

Technical Field

[0001] The present invention relates to a laser welding tuned sheet metal filter, which belongs to the field of communication technology, particularly to the part related to base station filters. Specifically, it can be subdivided into base station hardware and filtering technology, especially for the filtering requirements of high-frequency communication networks of modern communication systems (such as 5G and 6G). Background Art

[0002] With the large-scale deployment of 5G communication networks, the use of base station filters has increased exponentially. There are currently two mainstream filter solutions in the market. One is the dielectric filter, but there are still major deficiencies in technology and materials. The dielectric constant of ceramic powder is unstable, and the risk of cracking limits the large-scale development of ceramics. The other is a metal filter with a miniaturized metal cavity, which is also adopted by most manufacturers in the market. Metal cavity filters can be processed by CNC in the early stage, but the cost is too high. In the later stage, large-scale production of products is mostly cavity die-casting, and resonators and taps are stamped and stretched. However, there are too many parts and the assembly test yield is too low, which has always been the pain point of the industry. In addition, the die-cast cavity has a low yield, and the shell must be electroplated, which can easily cause environmental pollution. Therefore, a new solution is needed to replace the existing filter solution to lay the foundation for the subsequent development of 6G and even 7G. Summary of the invention

[0003] In view of the above-mentioned technical problems, the purpose of the present invention is to propose a laser welded tuned sheet metal filter.

[0004] The technical solution of the present invention is achieved as follows: a laser welding tuned sheet metal filter, comprising

[0005] A filter box, wherein a cavity is formed in the filter box, a plurality of resonators are arranged in the cavity, and the plurality of resonators are distributed in an array, connectors are arranged at both ends of the filter box, and the resonators located at both sides of the cavity are respectively connected and fixed to the connectors at both ends of the filter box;

[0006] The cover plate is fixed to the filter box by laser welding, and a plurality of tuning holes are provided on the cover plate, and the plurality of tuning holes are respectively matched with a plurality of resonators; the cavity, the resonator and the cover plate are formed at one time by stamping sheet metal.

[0007] Preferably, the number of the resonators is the same as the number of the tuning holes, and the positions of the multiple resonators and the multiple tuning holes correspond one to one.

[0008] Preferably, a metal foil is provided on the cover plate, and the metal foil is used to cover the plurality of tuning holes.

[0009] Preferably, the plurality of resonators are integrally formed on one side of the filter box, there is a gap between the plurality of resonators and the opposite side of the filter box, and the plurality of resonators are bent so that the top surface of each resonator is flush with the top surface of the filter box.

[0010] Preferably, the resonators on both sides of the cavity are integrally formed with connecting parts, and the resonators on both sides of the cavity are respectively connected to the connectors located at both ends of the filter box through the connecting parts, and the corresponding connecting parts and connectors are fixed by laser welding.

[0011] Preferably, welding holes are provided on both sides of the cover plate, and the welding holes are located directly above the welding positions of the connecting parts and the connectors on both sides of the cavity.

[0012] Preferably, through holes are provided on both end surfaces of the filter box and the cover plate, and the through holes are used for connectors at both ends of the filter box to pass through, and each connector is fixed to the filter box and the cover plate by welding.

[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0014] 1. The present invention ensures the accuracy and consistency of the components by forming the entire cavity, cover plate and resonator at one time through a high-precision stamping sheet metal process. This design reduces the number of components and reduces the assembly error rate in the production process. The simplified structure and reduced number of components make the sheet metal filter easier to integrate and debug in the communication system, improve the reliability and performance of the overall system, and can support the development of communication technologies from 5G to the future 6G and even 7G.

[0015] 2. By setting tuning holes on the cover plate and combining it with precise laser welding technology, fine control of the filter frequency is achieved. This design allows fine-tuning of the frequency after production to ensure that the filter meets the specific communication frequency band requirements.

[0016] 3. Using metal foil to cover the tuning hole not only ensures the sealing of the tuning hole, but also avoids the environmental pollution and durability problems that may be caused by traditional sealing materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. 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 the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0018] Attached Figure 1 This is a schematic structural diagram of a laser welded tuned sheet metal filter according to the present invention;

[0019] Attached Figure 2 This is a schematic structural diagram of a laser welded tuned sheet metal filter according to the present invention with a cover plate removed;

[0020] Attached Figure 3 For attachment Figure 2 Schematic diagram of the structure without the connector.

[0021] In the figure: 1, filter box; 2, cavity; 3, resonator; 3a, connecting part; 4, connector; 5, cover plate; 6, tuning hole; 7, welding hole; 8, through hole. DETAILED DESCRIPTION

[0022] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "straight", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable 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, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] As attached Figure 1-3 As shown, a laser welding tuned sheet metal filter described in the present invention comprises a filter box 1 and a cover plate 5.

[0026] A cavity 2 is formed in the filter box 1, and a plurality of resonators 3 are arranged in the cavity, and the plurality of resonators 3 are distributed in an array. Connectors 4 are arranged at both ends of the filter box 1, and the resonators 3 located on both sides of the cavity 2 are respectively connected and fixed to the connectors 4 at both ends of the filter box 1; the cover plate 5 is fixed to the filter box 1 by laser welding, and a plurality of tuning holes 6 are opened on the cover plate 5, and the tuning holes 6 are used for laser tuning, and the plurality of tuning holes 6 are respectively matched with the plurality of resonators 3; wherein, the number of the resonators 3 is the same as the number of the tuning holes 6, and the positions of the plurality of resonators 3 and the plurality of tuning holes 6 correspond one by one to ensure the consistency of the resonators 3 and the tuning holes 6; the aperture of the tuning holes 6 can be enlarged or reduced according to actual conditions.

[0027] By setting the tuning hole 6 on the cover plate 5 and combining it with precise laser welding technology, fine control of the filter frequency is achieved. This design allows fine tuning of the frequency after production to ensure that the filter meets the specific communication frequency band requirements.

[0028] In the present embodiment, the cavity, the resonator 3 and the cover plate 5 are formed at one time by stamping sheet metal, and the multiple resonators 3 are integrally formed on one side of the filter box 1. There is a gap between the multiple resonators 3 and the opposite side of the filter box 1, and the multiple resonators 3 are bent so that the top surface of each resonator 3 is flush with the top surface of the filter box 1.

[0029] The entire cavity, cover plate 5 and resonator 3 are formed in one step through a high-precision stamping sheet metal process, which greatly reduces the production cost compared to CNC processing and die-casting processes. This method is superior in material utilization and production efficiency, especially in large-scale production. At the same time, the sheet metal process allows the production of lighter filter structures, which is particularly important for mobile communication base stations because it can simplify the installation and maintenance process and reduce structural support requirements. Of course, due to the reduction in the number of components and the simplification of the assembly process, the production yield of sheet metal filters can be improved, the use of complex components can be reduced, and the assembly error rate in the production process can be reduced.

[0030] In this embodiment, a metal foil (not shown) is provided on the cover plate 5, and the metal foil is used to cover the multiple tuning holes 6. Using the metal foil to cover the tuning holes 6 not only ensures the sealing of the tuning holes 6, but also avoids the environmental pollution and durability problems that may be caused by traditional sealing materials.

[0031] The resonators 3 located on both sides of the cavity 2 are integrally formed with connecting parts 3a, and the resonators 3 on both sides of the cavity 2 are respectively connected to the connectors 4 located at both ends of the filter box 1 through the connecting parts 3a, and the corresponding connecting parts 3a and connectors 4 are fixed by laser welding. Welding holes 7 are opened on both sides of the cover plate 5, and the welding holes 7 are located just above the welding positions of the connecting parts 3a and connectors 4 on both sides of the cavity 2, so as to facilitate laser welding of the connecting positions of the connecting parts 3a and connectors 4.

[0032] Through holes 8 are provided on both end surfaces of the filter box 1 and the cover plate 5. The through holes 8 are used for the connectors 4 at both ends of the filter box 1 to pass through, and each connector 4 is welded and fixed to the filter box 1 and the cover plate 5. Specifically, a semicircular through hole 8 is provided on the end surface of the filter box 1, and a semicircular through hole 8 is provided on the end surface of the cover plate 5. After the filter box 1 and the cover plate 5 are welded together, the two semicircular through holes 8 form a circular through hole 8, and the connector 4 passes through the circular through hole 8, and the upper half of the connector 4 is welded to the cover plate 5 by surface welding, and the lower half of the connector 4 is welded to the filter box 1 by surface welding.

[0033] The manufacturing process of the laser welding tuned sheet metal filter of this application is as follows:

[0034] In the first step, the cavity and the cover plate 5 are punched out according to the preset coupling matrix shape by using the stamping sheet metal technology, and then necessary bending processing is performed to form the final filter structure.

[0035] In the second step, the gap between the filter box 1 and the cover plate 5 is sealed by high-precision laser welding technology, which provides a seamless joint and enhances the structural strength and electromagnetic shielding effect of the filter.

[0036] In the third step, a laser is used to perform a final frequency adjustment on the filter through the tuning hole 6 on the cover plate 5. After the adjustment is completed, the tuning hole 6 is sealed with a metal foil to ensure the frequency stability and protection of the filter.

[0037] The fourth step is to conduct a comprehensive performance test on the filter after the structure is assembled and the frequency is adjusted to ensure that it meets the requirements of the design parameters and communication standards.

[0038] In summary, the present invention avoids the electroplating step required in the traditional die-casting process, thereby reducing the use of harmful chemicals and the waste generated, and has less negative impact on the environment. At the same time, the simplified structure and reduced number of components make sheet metal filters easier to integrate and debug in communication systems, improving the reliability and performance of the overall system, and can support the development of communication technologies from 5G to future 6G and even 7G.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser welded tuned sheet metal filter, characterized in that: Include A filter box (1), wherein a cavity (2) is formed in the filter box (1), a plurality of resonators (3) are arranged in the cavity, and the plurality of resonators (3) are distributed in an array; connectors (4) are arranged at both ends of the filter box (1), and the resonators (3) located at both sides of the cavity (2) are respectively connected and fixed to the connectors (4) at both ends of the filter box (1); A cover plate (5), the cover plate (5) being fixed to the filter box (1) by laser welding, a plurality of tuning holes (6) being provided on the cover plate (5), the plurality of tuning holes (6) respectively cooperating with a plurality of resonators (3); the cavity, the resonator (3) and the cover plate (5) being formed at one time by stamping sheet metal.

2. A laser welded tuned sheet metal filter according to claim 1, characterized in that: The number of the resonators (3) is the same as the number of the tuning holes (6), and the positions of the multiple resonators (3) and the multiple tuning holes (6) correspond one to one.

3. The laser welded tuned sheet metal filter according to claim 1, characterized in that: A metal foil is arranged on the cover plate (5), and the metal foil is used to cover the plurality of tuning holes (6).

4. The laser welded tuned sheet metal filter according to claim 1, characterized in that: The plurality of resonators (3) are integrally formed on one side of the filter box (1), a distance exists between the plurality of resonators (3) and the opposite side of the filter box (1), and the plurality of resonators (3) are bent so that the top surface of each resonator (3) is flush with the top surface of the filter box (1).

5. The laser welded tuned sheet metal filter according to claim 1, characterized in that: The resonators (3) located on both sides of the cavity (2) are integrally formed with connecting parts (3a); the resonators (3) on both sides of the cavity (2) are respectively connected to connectors (4) located at both ends of the filter box (1) through the connecting parts (3a); and the corresponding connecting parts (3a) and the connectors (4) are fixed by laser welding.

6. The laser welded tuned sheet metal filter according to claim 5, characterized in that: Welding holes (7) are provided on both sides of the cover plate (5), and the welding holes (7) are located directly above the welding positions of the connecting parts (3a) and the connectors (4) on both sides of the cavity (2).

7. The laser welded tuned sheet metal filter according to claim 1, characterized in that: Through holes (8) are provided on both end surfaces of the filter box (1) and the cover plate (5), and the through holes (8) are used for the connectors (4) at both ends of the filter box (1) to pass through, and each connector (4) is fixed to the filter box (1) and the cover plate (5) by welding.

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