A filter

Abstract

This application relates to the field of electrical components, specifically to a filter; it includes a housing, a resonant cavity, several stub transmission plates, and a connector; the lateral extensions of adjacent stub transmission plates are connected at intervals by insulating connectors to form a main connector, the two ends of the main connector are electrically connected to the connector, and the lateral extensions of each stub transmission plate are staggered on both sides of the main connector and electrically connected to the sidewall of the resonant cavity; through this structure, the stub transmission plates form a continuous whole, effectively improving mechanical strength and resonant stability, simplifying assembly processes and reducing the number of solder joints; at the same time, the staggered arrangement of the main connector and the stub transmission plates improves the utilization rate of cavity space, which is conducive to realizing miniaturization and high integration design.

Description

Technical Field

[0001] This application relates to the field of electrical components, and more specifically to a filter. Background Technology

[0002] This application is an improvement based on a cavity filter disclosed in Chinese patent document CN219917549U (publication date: October 27, 2023) and a microstrip bandstop filter disclosed in Chinese patent document CN219937341U (publication date: October 31, 2023).

[0003] The cavity filter disclosed in CN219917549U uses a resonant cavity with multiple resonant rods and corresponding resonant disks. Each resonant rod has a "T" shape, with its vertical extension fixedly connected to the wall of a through groove inside the cavity, and its lateral extension suspended within the cavity. The end face of the resonant rod is positioned perpendicular to the axis of the resonant cavity to achieve the desired electromagnetic resonance characteristics. However, this technical solution has the following drawbacks: First, the lateral extension of the resonant rod is suspended, making it prone to deformation under vibration and assembly stress, which affects the stability of the product. Second, the suspended lateral extension occupies space inside the resonant cavity, limiting the miniaturization and high integration design of the device.

[0004] The microstrip band-stop filter disclosed in CN219937341U has a technical solution that sets a band-stop transmission component within a cavity of a housing. This band-stop transmission component includes a main transmission plate and multiple stub transmission plates arranged alternately and connected to both sides of the main transmission plate. However, this technical solution has the following drawbacks: First, it has many components, requiring the simultaneous placement of both the main transmission plate and the stub transmission plates, resulting in a complex structure and significant processing and assembly difficulties. Second, the main transmission plate and the stub transmission plates are fixed using metal welding, making the connection points relatively weak. Under long-term operating conditions, these connections are susceptible to thermal stress, mechanical vibration, or assembly errors, leading to breakage, decreased filtering performance, or circuit failure, thereby affecting the reliability and lifespan of the filter. Utility Model Content

[0005] The purpose of this utility model is to provide a filter that utilizes a structure including a housing, a resonant cavity, stub transmission plates, and a connector. The lateral extensions of adjacent stub transmission plates are connected at intervals by insulating connectors to form a main connector. Both ends of the main connector are electrically connected to the connector. The lateral extensions of each stub transmission plate are staggered on both sides of the main connector and electrically connected to the sidewall of the resonant cavity. This solves the technical problems in the prior art of filters, such as poor structural stability, complex assembly process, easy failure of connection points, and low cavity space utilization caused by the suspended stub transmission plates. It produces the beneficial effects of high structural stability, simplified assembly, and reliable performance.

[0006] To achieve the aforementioned objectives, the technical solution adopted by this utility model is as follows:

[0007] A filter, comprising,

[0008] The housing is made of metal and has a resonant cavity inside;

[0009] A plurality of stub transmission plates, the stub transmission plates being made of metal and suspended within the resonant cavity, including a lateral extension and a lateral extension disposed on one side of the lateral extension;

[0010] Two connectors are respectively disposed at two lateral ends of the housing;

[0011] The lateral extensions of adjacent stub transmission pieces are insulatedly connected to form a main connector by an insulating connector, and the two ends of the main connector are electrically connected to the two connectors respectively.

[0012] The lateral extensions of each of the stub transmission pieces are staggered on both sides of the main connector, and the connecting ends of the lateral extensions are electrically connected to the opposite side walls of the resonant cavity.

[0013] Preferably, the two stub transmission pieces located at both ends of the main connector are rectangular transmission pieces, and the rectangular transmission pieces further include rectangular piece portions;

[0014] The rectangular piece has one lateral end for connecting to the connector, and the other lateral end has the lateral extension and the side extension.

[0015] Preferably, the stub transmission piece connecting the two rectangular transmission pieces is a T-shaped transmission piece;

[0016] The lateral extension of the T-shaped transmission piece is connected to the middle of its lateral extension.

[0017] Preferably, the number of the T-shaped transmission pieces is an odd number.

[0018] Preferably, the insulating connector is a fixed post made of insulating material, and the ends of the lateral extensions of adjacent branch transmission pieces are aligned with each other and have mounting holes. The fixed post passes through the mounting holes of the adjacent branch transmission pieces to connect the adjacent branch transmission pieces at intervals.

[0019] Preferably, the fixed pile is insulated and supported between the two inner walls of the resonant cavity;

[0020] The fixed pile has multiple annular grooves on its pile body, and the mounting holes of the adjacent branch transmission pieces are respectively fitted into the corresponding annular grooves.

[0021] Preferably, the stub transmission pieces are arranged in parallel to each other, forming a two-layer parallel structure;

[0022] The lateral extensions of adjacent stub transmission pieces are fixed to different layers by the fixing piles; the lateral extensions of each stub transmission piece located in the same layer extend along the same side of the main connector.

[0023] Preferably, the end of the lateral extension is welded and fixed to the side wall of the resonant cavity;

[0024] And / or, the two ends of the main connector are respectively welded and fixed to the two connectors.

[0025] Preferably, the main connector is arranged parallel to the transverse axis of the housing.

[0026] Preferably, the lateral extension and the side extension of the spur transmission plate are integrally stamped from a metal sheet.

[0027] The beneficial effects of this utility model are:

[0028] Significantly improved structural stability: This invention forms a main connecting body by electrically connecting the lateral extensions of several branch transmission pieces end to end, thus forming a continuous structural whole rather than a suspended, dispersed unit. This effectively resists deformation caused by mechanical vibration and assembly stress, thereby maintaining stable electromagnetic resonance characteristics and improving the structural reliability and electrical performance stability of the filter during long-term operation.

[0029] Simplified structural design and reduced assembly complexity: This utility model only connects the main body of the whole by connecting the ends of several branch transmission pieces, realizing the integrated layout of the filtering path; this improvement significantly reduces the number of parts, avoids the complex assembly process caused by multi-piece welding, reduces the difficulty of production and processing, and at the same time reduces the number of solder points, fundamentally weakening the weak links of the connection parts.

[0030] Facilitates miniaturization and high integration design: Since the main connector and stub transmission pieces are arranged in an interleaved manner in the resonant cavity, and the structure is compact and the space utilization rate is high, this utility model significantly reduces the waste of cavity space and facilitates the miniaturization layout of the overall structure. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0033] Figure 2 for Figure 1 Enlarged view of the structure of region A;

[0034] Figure 3 This is a schematic diagram of the interconnected stub transmission pieces in this utility model;

[0035] Figure 4 This is a schematic diagram of the fixed pile in this utility model.

[0036] Among them, 1-resonant cavity, 2-lateral extension, 3-lateral extension, 4-connector, 5-housing, 6-rectangular piece, 7-fixing post. Detailed Implementation

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0039] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0040] Example 1

[0041] See Figure 1 and Figure 2 A filter includes a housing 5, several stub transmission pieces, and two connectors 4;

[0042] The housing 5 is made of metal and includes a base and a cover plate. The base has a mounting cavity, and the base and cover plate close together to form the resonant cavity 1. The shape of the mounting cavity should be based on the shape of several stub transmission pieces. Specific shapes are inspired by documents such as CN219937341U. Therefore, the specific shape and structure of the resonant cavity 1 are existing technology and will not be described further here. To clearly demonstrate the internal structure of this utility model... Figure 1 The cover plate structure is not shown; the shape of the aforementioned mounting cavity is... Figure 1 This is also clearly shown in the text.

[0043] Several stub transmission plates are suspended in the resonant cavity 1. Each stub transmission plate includes a lateral extension 2 and a lateral extension 3 disposed on one side of the lateral extension 2. The stub transmission plates include two types: rectangular transmission plates and T-shaped transmission plates.

[0044] The lateral extensions 2 of each stub transmission piece are insulatedly connected along their length by insulating connectors made of insulating material to form a lateral extension body; for ease of description, the lateral extension body is referred to as the main connector body; both ends of the main connector body are electrically connected to two connectors 4, that is, the lateral extensions 2 located at the beginning and end of the main connector body are electrically connected to two connectors 4, and the two connectors 4 are respectively located at the two lateral ends of the housing 5; the lateral extensions 3 of each stub transmission piece are staggered on both sides of the main connector body, that is, the lateral extensions 3 of adjacent stub transmission pieces extend in opposite directions, and the ends of the lateral extensions 3 are electrically connected to the two side walls of the resonant cavity 1 that are opposite to each other; specifically, the lateral extensions 3 of each stub transmission piece can be staggered on both sides of the main connector body by arranging the forward and reverse sides alternately;

[0045] Specifically, in this embodiment, seven stub transmission pieces are provided, two of which are rectangular transmission pieces and the other five are T-shaped transmission pieces. The two rectangular transmission pieces are located at both ends of the main connector, and the five T-shaped transmission pieces are connected between the two rectangular transmission pieces. The lateral extension 2 and the side extension 3 of the aforementioned T-shaped transmission piece are arranged perpendicularly to each other, and the side extension 3 of the T-shaped transmission piece is connected to the middle of its lateral extension 2. Compared with the T-shaped transmission piece, the rectangular transmission piece adds a rectangular piece 6, one lateral end of which is used to connect to the connector 4, and the other lateral end is provided with a lateral extension 2. The lateral extension 2 is provided with a side extension 3 near the rectangular piece 6. The number of T-shaped transmission pieces is preferably odd, so that the side extensions 3 of the two rectangular transmission pieces extend to the same side.

[0046] Example 2

[0047] See Figure 3 and Figure 4 Based on the above embodiment 1, the structure of the insulating connector will be described in detail;

[0048] In this embodiment, the insulating connector is a fixing post 7 made of insulating material. Mounting holes are aligned on the end faces of the lateral extensions 2 of adjacent branch transmission pieces. A fixing post 7 passes through the mounting holes of adjacent branch transmission pieces, connecting them. To more securely connect the branch transmission pieces, they can be arranged parallel to each other, thus forming a configuration as shown in the image. Figure 3 The two-layer structure shown has the lateral extension 2 of the adjacent branch transmission plates fixed to different layers by fixing piles 7, and the lateral extension 3 of each branch transmission plate in the same layer extends along the same side of the main connector.

[0049] To more firmly support the interconnected stub transmission pieces and prevent them from bending within the resonant cavity 1, the two ends of the fixing post 7 can be insulated against the two inner walls of the resonant cavity 1. Since in the aforementioned embodiment 1, the end of the lateral extension 3 is electrically connected to the side wall of the resonant cavity 1, it is well known, based on spatial geometry, that the fixing post 7 should abut against the bottom surface of the aforementioned mounting cavity and the inner surface of the aforementioned cover plate, thereby insulatingly supporting the fixing post 7 within the resonant cavity 1. The method to achieve this insulated support could be to make the fixing post 7 entirely of insulating material. Furthermore, based on common knowledge, there are many other methods, which will not be elaborated here. The method in this embodiment is to open multiple annular grooves on the body of the fixing post 7, with the mounting holes of adjacent stub transmission pieces respectively fitted into the corresponding mounting annular grooves.

[0050] In the above embodiments, in order to better achieve the beneficial effects of this application:

[0051] The end of the lateral extension 3 of the stub transmission piece is welded and fixed to the side wall of the resonant cavity 1; and / or, the two ends of the main connector are welded and fixed to the two connectors 4 respectively.

[0052] The main connector is set parallel to the transverse axis of the housing 5.

[0053] The lateral extension 2 and the side extension 3 of the stub transmission plate are integrally formed from the same metal sheet by a stamping process, thereby reducing welding points and improving the consistency of structural strength and electrical performance.

[0054] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A filter, characterized in that: include, The housing (5) is made of metal and has a resonant cavity (1) inside. Several stub transmission plates, the stub transmission plates are made of metal and are suspended in the resonant cavity (1), including a lateral extension (2) and a lateral extension (3) disposed on one side of the lateral extension (2). Two connectors (4) are respectively disposed at two lateral ends of the housing (5); The lateral extensions (2) of adjacent stub transmission pieces are insulatedly connected to form a main connector through an insulating connector, and the two ends of the main connector are electrically connected to the two connectors (4) respectively. The lateral extensions (3) of each of the stub transmission pieces are staggered on both sides of the main connector, and the connecting ends of the lateral extensions (3) are electrically connected to the two side walls opposite to the resonant cavity (1).

2. The filter as described in claim 1, characterized in that: The two stub transmission pieces located at both ends of the main connector are rectangular transmission pieces, and the rectangular transmission pieces also include rectangular piece portions (6). The rectangular piece (6) has one lateral end for connecting to the connector (4), and the other lateral end is provided with the lateral extension (2) and the side extension (3).

3. The filter as described in claim 2, characterized in that: The stub transmission piece connecting the two rectangular transmission pieces is a T-shaped transmission piece; The lateral extension (3) of the T-shaped transmission piece is connected to the middle of its lateral extension (2).

4. The filter as described in claim 3, characterized in that: The number of the T-shaped transmission pieces is odd.

5. The filter as described in claim 1, characterized in that: The insulating connector is a fixed post (7) made of insulating material. The ends of the lateral extensions (2) of the adjacent branch transmission pieces are aligned and have mounting holes. The fixed post (7) passes through the mounting holes of the adjacent branch transmission pieces to connect the adjacent branch transmission pieces at intervals.

6. The filter as described in claim 5, characterized in that: The fixed pile (7) is insulated and supported between the two inner walls of the resonant cavity (1); The fixed pile (7) has multiple annular grooves on its pile body, and the mounting holes of the adjacent branch transmission pieces are respectively fitted into the corresponding annular grooves.

7. The filter as described in claim 5, characterized in that: The stub transmission pieces are arranged in parallel to each other, forming a two-layer parallel structure; The lateral extensions (2) of adjacent branch transmission pieces are fixed to different layers by the fixing piles (7); the lateral extensions (3) of each branch transmission piece located in the same layer extend along the same side of the main connector.

8. The filter as described in claim 1, characterized in that: The end of the lateral extension (3) is welded and fixed to the side wall of the resonant cavity (1); And / or, the two ends of the main connector are respectively welded and fixed to the two connectors (4).

9. The filter as described in claim 1, characterized in that: The main connector is arranged parallel to the transverse axis of the housing (5).

10. The filter as described in claim 1, characterized in that: The lateral extension (2) and the side extension (3) of the spur transmission plate are integrally stamped from a metal sheet.

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