Filter with capacitance coupling structure

Abstract

The utility model relates to the technical field of filters, and discloses a filter with a capacitive coupling structure. The filter comprises a cavity, and an insulating coupling assembly, a fastening screw and a low-pass structure which are arranged in the cavity, the insulation coupling assembly comprises a first tap piece, a second tap piece and an insulation connecting piece, the insulation connecting piece is connected with one end of the first tap piece and one end of the second tap piece, and the tail end of the first tap piece and the tail end of the second tap piece are arranged in a spaced mode. The fastening screw penetrates through the other end of the first tap piece and is in threaded connection with the cavity, and the other end of the second tap piece is connected with the low-pass structure. According to the capacitance coupling structure, the influence caused by the environment temperature can be reduced, and the stability of the performance of the cavity filter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of filters, and in particular to a filter with a capacitive coupling structure. Background Art

[0002] In existing cavity filters, the tap is usually fixed in the cavity by plastic fastening screws, and a plastic gasket is installed between the tap and the cavity to form insulation, thereby forming capacitive coupling to achieve signal transmission. However, the volume of the plastic gasket in the capacitive coupling structure is greatly affected by the ambient temperature. Under the effect of thermal expansion and contraction, the tap originally tightened by the fastening screw may become loose, thereby affecting the stability of the cavity filter performance. Utility Model Content

[0003] The technical problem to be solved by the present application is to optimize the existing capacitive coupling structure to reduce the influence of ambient temperature on the capacitive coupling structure and improve the stability of cavity filter performance.

[0004] In order to solve the above problems, the present application provides a filter with a capacitive coupling structure, including a cavity and an insulating coupling component, a fastening screw and a low-pass structure arranged inside the cavity; the insulating coupling component includes a first tap piece, a second tap piece and an insulating connector, the insulating connector connects one end of the first tap piece and the second tap piece, and the ends of the first tap piece and the second tap piece are set at a distance, the fastening screw passes through the other end of the first tap piece and is threadedly connected to the cavity, and the other end of the second tap piece is connected to the low-pass structure.

[0005] Preferably, the first tap piece has a first connection end and a second connection end, the second tap piece has a third connection end and a fourth connection end, the first connection end is connected to the fastening screw, the insulating connector connects the second connection end and the third connection end, the third connection end is located directly above the second connection end and is parallel to each other, and the fourth connection end is connected to the low-pass structure.

[0006] Preferably, the second connection end and the third connection end are respectively provided with positioning holes, and the insulating connector passes through the positioning holes.

[0007] Preferably, the axes of the positioning holes on the second connecting end and the third connecting end are staggered with each other.

[0008] Preferably, stepped first limiting portions are formed on both sides of the second connection end, convex second limiting portions are formed on both sides of the third connection end, and the insulating connector is formed between the first limiting portion and the second limiting portion.

[0009] Preferably, the insulating connector is an injection-molded rubber-coated block, and the insulating connector is formed by injection molding and rubber coating on the outer sides of the second connection end and the third connection end.

[0010] Preferably, the fourth connection end overlaps with one end of the low-pass structure.

[0011] Preferably, the fastening screw is made of metal.

[0012] Compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0013] The capacitive coupling structure in the filter of the present application is optimized on the basis of the prior art. The first tap piece and the second tap piece are connected by an insulating connector to form an insulating coupling. At the same time, the first tap piece is connected to the cavity through a fastening screw, and the second tap piece is connected to the low-pass structure, replacing the traditional one-piece tap piece directly insulated and coupled with the cavity and connected to the low-pass structure. Herein, this capacitive coupling structure can reduce the influence brought by the ambient temperature and improve the stability of the performance of the cavity filter. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic diagram of the overall structure of the filter in the embodiment of the present application.

[0016] Figure 2 It is a schematic diagram of the assembly relationship of the insulating coupling assembly in the embodiment of the present application.

[0017] Figure 3 It is a cross-sectional view of the filter in the embodiment of the present application.

[0018] Description of the reference numerals: 1, cavity; 2, insulating coupling assembly; 3, first tap piece; 4, second tap piece; 5, insulating connector; 6, first connection end; 7, second connection end; 8, third connection end; 9, fourth connection end; 10, fastening screw; 11, low-pass structure; 12, connection hole; 13, positioning hole; 14, first limiting portion; 15, second limiting portion. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0020] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0021] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification of the present application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0022] It should be further understood that the term "and / or" used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0023] Please refer to Figures 1 to 3 , an embodiment of the present application provides a filter with a capacitive coupling structure. The filter includes a cavity 1 and an insulating coupling component 2, a fastening screw 10, and a low-pass structure 11 disposed inside the cavity 1. Among them, the insulating coupling component 2 includes a first tap piece 3, a second tap piece 4, and an insulating connecting piece 5. The insulating connecting piece 5 connects one ends of the first tap piece 3 and the second tap piece 4, and the ends of the first tap piece 3 and the second tap piece 4 are arranged at an interval. The fastening screw 10 penetrates through the other end of the first tap piece 3 and is threadedly connected to the cavity 1, and the other end of the second tap piece 4 is connected to the low-pass structure 11.

[0024] The capacitive coupling structure in this filter is optimized on the basis of the prior art. The first tap piece 3 and the second tap piece 4 are connected by the insulating connecting piece 5 to form an insulating coupling. At the same time, the first tap piece 3 is connected to the cavity 1 through a fastening screw, and the second tap piece 4 is connected to the low-pass structure 11, replacing the traditional one-piece tap piece directly insulated and coupled to the cavity 1 and connected to the low-pass structure 11. Here, the capacitive coupling structure in which the insulating connecting piece 5 wraps the first tap piece 3 and the second tap piece 4 does not require a plastic gasket to be installed between the tap piece and the cavity 1, and can reduce the influence brought by the ambient temperature, thereby improving the stability of the performance of the cavity 1 filter.

[0025] In a specific embodiment, the first tap piece 3 has a first connection end 6 and a second connection end 7, and the second tap piece 4 has a third connection end 8 and a fourth connection end 9. Among them, a connection hole 12 is formed in the first connection end 6, and a fastening screw 10 passes through the connection hole 12 and is threadedly connected to the cavity 1, thereby fixing the first connection end 6. The insulating connector 5 connects the second connection end 7 and the third connection end 8. The third connection end 8 is directly above the second connection end 7 and they are parallel to each other. There is a certain distance between the second connection end 7 and the third connection end 8, thereby forming an insulating coupling. The fourth connection end 9 is lapped on one end of the low-pass structure 11.

[0026] In this embodiment, the fastening screw 10 is made of metal. Compared with a plastic fastening screw 10, the metal fastening screw 10 has a greater assembly torque and is not easily broken during the assembly process of this capacitive coupling structure.

[0027] In this embodiment, the insulating connector 5 is an injection-molded encapsulation block. The insulating connector 5 is formed by injection-molding and encapsulation on the outer sides of the second connection end 7 and the third connection end 8 to form an insulating coupling and realize signal transmission.

[0028] In a specific embodiment, positioning holes 13 are respectively formed through the second connection end 7 and the third connection end 8. The positioning holes 13 are used for filling glue during the injection-molding and encapsulation process. After the insulating connector 5 is formed by injection-molding and encapsulation on the outer sides of the second connection end 7 and the third connection end 8, the insulating connector 5 passes through the positioning holes 13, thereby positioning the second connection end 7 and the third connection end 8, making it not easy for the second connection end 7 and the third connection end 8 to break away from the insulating connector 5, so as to enhance the stability of this capacitive coupling structure.

[0029] Furthermore, the axes of the positioning holes 13 on the second connection end 7 and the third connection end 8 are arranged staggeredly. When the glue in one of the positioning holes 13 breaks, it will not affect the glue in the other positioning hole 13, which can further improve the stability of this capacitive coupling structure.

[0030] In a specific embodiment, stepped first limiting portions 14 are respectively formed on both sides of the second connection end 7, and convex second limiting portions 15 are respectively formed on both sides of the third connection end 8. The insulating connector 5 is formed between the first limiting portion 14 and the second limiting portion 15 to prevent the first tap piece 3 and the second tap piece 4 from moving towards each other. Here, when the first tap piece 3 and the second tap piece 4 are placed in the injection mold, the first limiting portion 14 limits the first tap piece 3, and the second limiting portion 15 limits the second tap piece 4, so that the insulating connector 5 can be formed between the first limiting portion 14 and the second limiting portion 15 in the subsequent injection-molding and encapsulation process.

[0031] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A filter with a capacitive coupling structure, characterized in that: It includes a cavity, and an insulating coupling component, fastening screws, and a low-pass structure disposed inside the cavity; The insulating coupling component includes a first tap piece, a second tap piece, and an insulating connector. The insulating connector connects one ends of the first tap piece and the second tap piece, and the ends of the first tap piece and the second tap piece are arranged at an interval. The fastening screw penetrates through the other end of the first tap piece and is threadedly connected to the cavity. The other end of the second tap piece is connected to the low-pass structure.

2. The filter with a capacitive coupling structure according to claim 1, characterized in that, The first tap piece has a first connection end and a second connection end. The second tap piece has a third connection end and a fourth connection end. The first connection end is connected to the fastening screw. The insulating connector connects the second connection end and the third connection end. The third connection end is located directly above the second connection end and is parallel to each other. The fourth connection end is connected to the low-pass structure.

3. The filter with a capacitive coupling structure according to claim 2, characterized in that, Positioning holes are respectively formed in the second connection end and the third connection end, and the insulating connector penetrates through the positioning holes.

4. A filter with a capacitive coupling structure according to claim 3, characterized in that, The axes of the positioning holes on the second connection end and the third connection end are arranged staggeredly.

5. The filter with a capacitive coupling structure according to claim 2, characterized in that, Step-shaped first limiting portions are respectively formed on both sides of the second connection end, and convex second limiting portions are respectively formed on both sides of the third connection end. The insulating connector is formed between the first limiting portion and the second limiting portion.

6. The filter with a capacitive coupling structure according to claim 2, characterized in that, The insulating connector is an injection-molded encapsulation block, and the insulating connector is formed by injection-molding and encapsulation on the outer sides of the second connection end and the third connection end.

7. A filter having a capacitive coupling structure according to claim 2, wherein, The fourth connection end overlaps one end of the low-pass structure.

8. A filter with a capacitive coupling structure according to claim 1 or 2, characterized in that, The fastening screw is made of metal.

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