Low-pass structure and small filter

Abstract

The utility model relates to the technical field of communication, and discloses a low-pass structure and a small filter. The low-pass structure comprises a cavity, a heat shrink tube, a low-pass component, a first connecting assembly and a second connecting assembly, the cavity is provided with a through cavity, the heat shrink tube is arranged in the through cavity in a penetrating mode, and the low-pass component is arranged in the heat shrink tube in a penetrating mode. The first connecting assembly and the second connecting assembly are in contact connection with the two ends of the low-pass component respectively and seal the two ends of the through cavity respectively. The first connecting assembly comprises a connector and a necking part, the necking part is fixed to the end, away from the second connecting assembly, of the low-pass part, the connector is clamped and fixed to one end of the cavity, and the connector is matched with the necking part and the low-pass part in an inserted mode. Compared with a traditional low-pass filter, the low-pass filter has the advantages that the low-pass structure is more simplified, all parts are connected more tightly, the situation of poor contact of the low-pass structure can be reduced, all the parts are in contact connection without welding, the assembly steps are simplified, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of communications, and in particular, to a low-pass structure and a small filter. Background Art

[0002] A filter is a typical frequency selection device that can effectively suppress useless signals and pass useful signals. The performance of the filter directly affects the quality of the communication system and is a key component in modern microwave and millimeter-wave communication systems. Existing filters have a large number of components, various types, a relatively large volume, and a cumbersome assembly process. The low-pass structure is prone to poor contact, and in addition, the debugging time is long, resulting in high time, labor, and material costs for producing filters. Summary of the Utility Model

[0003] The technical problem to be solved by this application is to simplify the existing filter structure, improve the tightness of the connection between filter components, reduce the occurrence of poor contact in the low-pass structure, simplify the assembly steps, improve production efficiency, and reduce production costs.

[0004] In a first aspect, to solve the above problems, this application provides a low-pass structure, including a cavity, a heat shrinkable tube, a low-pass component, a first connection component, and a second connection component; a through cavity is opened in the cavity, the heat shrinkable tube is inserted into the through cavity, and the low-pass component is disposed through the heat shrinkable tube; the first connection component and the second connection component are respectively in contact connection with both ends of the low-pass component and respectively seal both ends of the through cavity; the first connection component includes a connector and a necking component, the necking component is fixed to one end of the low-pass component away from the second connection component, the connector is inserted and fixed to one end of the cavity, and the connector is inserted and cooperated with the necking component and the low-pass component.

[0005] Preferably, one end of the low-pass component has a connection head, an insertion slot is provided between the connection head and the low-pass component, and a plurality of clearance slots are spaced around the circumference of the connection head, and the necking component is sleeved outside the connection head and inserted into the insertion slot.

[0006] Preferably, one end of the connector is provided with an insertion portion, a guiding slot is opened at one end of the necking component close to the connector, and the insertion portion is inserted into the low-pass component along the guiding slot.

[0007] Preferably, the second connection component includes a limiting medium and a cover plate, the limiting medium is snap-fixed to one end of the low-pass component away from the first connection component, and the limiting medium abuts against the cover plate, and the cover plate is fixed to one end of the through cavity.

[0008] Preferably, the limiting medium includes a clamping portion and an abutting portion that are fixedly connected. The low-pass component is provided with a limiting groove, and the clamping portion is detachably connected to the limiting groove, and the abutting portion abuts against the cover plate.

[0009] Preferably, the clamping portion is provided with a through-connected card slot and an opening channel. The clamping portion is inserted into the low-pass component along the opening channel, and the card slot is fixedly clamped to the inner wall of the limiting groove.

[0010] Preferably, the diameter of the card slot is larger than the width of the opening channel.

[0011] Preferably, a guiding inclined surface is provided at the opening of the opening channel away from the card slot.

[0012] On the other hand, the present application provides a small filter, including the low-pass structure described in Embodiment 1, further including a resonant structure. The cavity is further provided with a resonant cavity, and the resonant structure is arranged in the resonant cavity and connected to the second connection component.

[0013] Preferably, the resonant structure includes a connecting piece, a resonator and a tuning screw. A coupling platform is arranged in the cavity, the resonator is fixed on the coupling platform, and the connecting piece connects the low-pass component and the coupling platform respectively; the cover plate seals the cavity, the tuning screw is fixedly penetrated through the cover plate, the tuning screw is located directly above the resonator, and a certain distance is spaced between the tuning screw and the resonator.

[0014] Compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0015] In the present application, the low-pass component is in contact connection with the first connection component and the second connection component respectively, and the low-pass structure is sealed by the first connection component and the second connection component. Herein, the connection effect between the connector and the low-pass component is strengthened by the necking component to prevent poor contact. Compared with the traditional low-pass filter, the low-pass structure is more simplified, the connection between components is tighter, the situation of poor contact of the low-pass structure can be reduced, and the contact connection between components does not require welding, which simplifies the assembly steps, improves production efficiency and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1This is a cross-sectional view of the low-pass structure in the embodiment of the present application.

[0018] Figure 2 This is a schematic diagram of the assembly relationship between the first connection component and the low-pass component in the embodiment of the present application.

[0019] Figure 3 This is a schematic diagram of the assembly relationship between the limiting medium and the low-pass component in the embodiment of the present application.

[0020] Figure 4 This is a schematic diagram of the overall structure of the small filter in the embodiment of the present application.

[0021] Figure 5 This is a schematic diagram of the internal structure of the small filter in the embodiment of the present application.

[0022] Explanation of reference numerals: 1, cavity; 11, through cavity; 12, resonant cavity; 13, coupling platform; 2, heat shrinkable tube; 3, low-pass component; 31, connector; 311, clearance groove; 32, insertion slot; 33, limiting groove; 4, first connection component; 41, connector; 411, insertion part; 42, necking component; 421, guiding groove; 5, second connection component; 51, limiting medium; 511, clamping part; 512, abutting part; 513, card slot; 514, opening channel; 515, guiding inclined surface; 52, cover plate; 521, fastening screw; 6, resonant structure; 61, connecting piece; 62, resonator; 63, tuning screw. Detailed implementation manners

[0023] 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.

[0024] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprise" 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.

[0025] 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.

[0026] It should also be further understood that the term "and / or" used in the specification and appended claims of this application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] Please refer to Figures 1 to 3 , in a first aspect, an embodiment of the present application provides a low-pass structure, which is assembled in a filter and can effectively suppress useless signals and pass useful signals. The low-pass structure includes a cavity 1, a heat shrinkable tube 2, a low-pass component 3, a first connection component 4, and a second connection component 5.

[0028] Specifically, the cavity 1 is integrally formed by stamping or 3D printing. The cavity 1 is provided with a through cavity 11. The heat shrinkable tube 2 is inserted into the through cavity 11. The low-pass component 3 is disposed through the heat shrinkable tube 2. The first connection component 4 and the second connection component 5 are respectively in contact connection with both ends of the low-pass component 3 and respectively seal both ends of the through cavity 11. Among them, the first connection component 4 includes a connector 41 and a necking component 42. The necking component 42 is fixed to one end of the low-pass component 3 away from the second connection component 5. The connector 41 is inserted and fixed to one end of the cavity 1, and the connector 41 is in insertion fit with the necking component 42 and the low-pass component 3.

[0029] Here, the low-pass component 3 is in contact connection with the first connection component 4 and the second connection component 5 respectively, and the low-pass structure is sealed through the first connection component 4 and the second connection component 5. Here, the low-pass component 3 is used to suppress the resonant frequency and filter out unnecessary frequencies. The connection effect between the connector 41 and the low-pass component 3 is strengthened through the necking component 42 to prevent poor contact. Compared with the traditional low-pass filter, this low-pass structure is more simplified, the connection between components is tighter, the situation of poor contact of the low-pass structure can be reduced, the occupied space of the filter is reduced, and the components are in contact connection with each other without welding, which simplifies the assembly steps, improves production efficiency, and reduces production costs.

[0030] In a specific embodiment, one end of the low-pass component 3 away from the second connection component 5 has a connection head 31, and the connection head 31 is cylindrical. There is an insertion slot 32 between the connection head 31 and the low-pass component 3. The connection head 31 is provided with a plurality of clearance slots 311 at equal intervals along the circumferential side. The necking component 42 is sleeved outside the connection head 31 and inserted into the insertion slot 32. In this embodiment, the necking component 42 is made of beryllium bronze material. Beryllium bronze has high hardness, elastic limit, fatigue limit and wear resistance, and also has good corrosion resistance, thermal conductivity and electrical conductivity. It does not generate sparks when impacted, has a long service life and high safety.

[0031] When assembling the first connection component 4, first press and rivet the necking component 42 to the outside of the connector head 31, and then insert the connector 41 into the necking component 42 and the low-pass component 3. The necking component 42 is used to constrict the connector head 31 to enhance the connection effect between the connector 41 and the low-pass component 3 and prevent poor contact.

[0032] In a specific embodiment, one end of the connector 41 close to the necking component 42 is provided with a plug-in portion 411. The end of the plug-in portion 411 away from the connector 41 is an arc surface, and the circumferential outer diameter of this end gradually decreases from the end close to the connector 41 to the end away from the connector 41. A guiding groove 421 is formed along the inner edge at one end of the necking component 42 close to the connector 41. When assembling the connector 41, the plug-in portion 411 is inserted into the low-pass component 3 along the guiding groove 421. The end design of the plug-in portion 411 is matched with the guiding groove 421, which facilitates the smoother insertion of the plug-in portion 411 into the low-pass component 3 and is not prone to breakage or wear.

[0033] In a specific embodiment, the second connection component 5 includes a limiting medium 51 and a cover plate 52. Among them, the limiting medium 51 is snap-fitted and fixed to one end of the low-pass component 3 away from the first connection component 4, and one end of the limiting medium 51 away from the low-pass component 3 abuts against the cover plate 52. The cover plate 52 is fixed to one end of the through cavity 11 by fastening screws 521 and seals the through cavity 11. The limiting medium 51 is used to limit the low-pass component 3, and the limiting medium 51 and the heat shrinkable tube 2 act together to prevent the low-pass component 3 from short-circuiting. The cover plate 52 is formed by stamping and is used to seal the through cavity 11 so that the signal is only transmitted within the through cavity 11.

[0034] Here, the connector 41, the low-pass component 3, the limiting medium 51, and the cover plate 52 are combined into one body through contact connection, which can replace the complex welding of the low-pass component 3 to the adapter plate or the adapter rod, greatly reducing the number of product parts, reducing the material cost, thus significantly reducing the production cost, and occupying a small space.

[0035] Please refer to Figure 3 , in a specific embodiment, the limiting medium 51 includes an integrally formed snap-fitting portion 511 and an abutting portion 512. A limiting groove 33 is formed at one end of the low-pass component 3 away from the first connection component 4, and the snap-fitting portion 511 is detachably connected to the limiting groove 33, and the abutting portion 512 abuts against the cover plate 52. The snap-fitting portion 511 cooperates with the limiting groove 33 to limit the low-pass component 3, and the abutting portion 512 abutting against the cover plate 52 can improve the installation tightness of the low-pass component 3 and ensure the reliability of the contact of the low-pass structure parts.

[0036] Further, the clamping portion 511 is provided with a through-connected card slot 513 and an opening channel 514. The clamping portion 511 is inserted into the low-pass component 3 along the opening channel 514, and the card slot 513 is clamped and fixed to the inner wall of the limiting groove 33 to facilitate the installation or disassembly of the limiting medium 51. Wherein, the diameter of the card slot 513 is greater than the width of the opening channel 514, and it is not easy for the clamping portion 511 to detach itself when inserted into the low-pass component 3 along the opening channel 514, which improves the tightness of the installation of the limiting medium 51. At the same time, a guiding inclined surface 515 is provided at the opening of the end of the opening channel 514 away from the card slot 513, which facilitates the alignment of the inner wall of the limiting groove 33 with the opening channel 514 when assembling the clamping portion 511, and improves the convenience of installing the limiting medium 51.

[0037] Please refer to Figure 4 and Figure 5 In the second aspect, an embodiment of the present application provides a small filter, which includes the low-pass structure of Embodiment 1 and further includes a resonance structure 6. Wherein, a resonance cavity 12 is further opened in the cavity 1, the resonance structure 6 is fixed in the resonance cavity 12 and is connected to the second connection component 5.

[0038] Specifically, the resonance structure 6 includes a connecting piece 61, a resonator 62 and a tuning screw 63. Wherein, a coupling platform 13 is provided in the cavity 1, the resonator 62 is fixed to the coupling platform 13, and the connecting piece 61 connects the end of the low-pass component 3 away from the first connection component 4 and the coupling platform 13 respectively. The cover plate 52 is used to seal the through cavity 11 and also seal the resonance cavity 12. The tuning screw 63 is fixedly penetrated through the cover plate 52. The tuning screw 63 is located directly above the resonator 62, and there is a certain distance between the tuning screw and the resonator 62, and this distance is determined by the actually required frequency.

[0039] Compared with the traditional low-pass component 3 that transfers the resonance structure 6 by welding the connecting piece 61 or the connecting rod, this filter adopts a contact connection, simplifies the processing steps, reduces the volume, and has a simpler structure, thereby improving the production efficiency and reducing the production cost.

[0040] The above 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 low-pass structure, characterized in that: It includes a cavity, a heat shrink tube, a low-pass component, a first connecting component and a second connecting component; The cavity body is provided with a through cavity, the heat shrinkable tube is arranged in the through cavity, and the low-pass component is arranged through the heat shrinkable tube; The first connecting component and the second connecting component are respectively in contact with and connected to two ends of the low-pass component, and respectively close two ends of the through cavity; The first connecting component includes a connector and a necking component, the necking component is fixed to one end of the low-pass component away from the second connecting component, the connector is plugged and fixed to one end of the cavity, and the connector is plugged and matched with the necking component and the low-pass component.

2. A low-pass structure according to claim 1, characterized in that: One end of the low-pass component has a connector, a plug-in slot is provided between the connector and the low-pass component, a plurality of space-avoiding slots are provided at intervals around the connector, and the shrinking component is sleeved on the outside of the connector and inserted into the plug-in slot.

3. A low-pass structure according to claim 2, characterized in that: A plug-in portion is provided at one end of the connector, a guide groove is provided near the end of the connector on the shrinkage component, and the plug-in portion is inserted into the low-pass component along the guide groove.

4. A low-pass structure according to claim 1 or 2, characterized in that: The second connection component includes a limiting medium and a cover plate. The limiting medium is clamped and fixed to one end of the low-pass component away from the first connection component, and the limiting medium abuts against the cover plate. The cover plate is fixed to one end of the through cavity.

5. A low-pass structure according to claim 4, characterized in that: The limiting medium comprises a clamping portion and an abutting portion which are fixedly connected to each other. The low-pass component is provided with a limiting groove, and the clamping portion is detachably connected to the limiting groove. The abutting portion abuts against the cover plate.

6. A low-pass structure according to claim 5, characterized in that: The clamping portion is penetrated by a communicating clamping slot and an opening channel, the clamping portion is clamped into the low-pass component along the opening channel, and the clamping slot is clamped and fixed to the inner wall of the limiting groove.

7. A low-pass structure according to claim 6, characterized in that: The diameter of the slot is greater than the width of the opening channel.

8. A low-pass structure according to claim 6, characterized in that: A guiding slope is arranged at the opening of the opening channel away from one end of the clamping slot.

9. A small filter, comprising the low-pass structure according to any one of claims 4 to 8, characterized in that: It also includes a resonant structure. The cavity body also has a resonant cavity. The resonant structure is arranged in the resonant cavity and is connected to the second connecting component.

10. A small filter according to claim 9, characterized in that: The resonant structure includes a connecting plate, a resonator and a tuning screw. A coupling platform is provided in the cavity, the resonator is fixed to the coupling platform, and the connecting plate connects the low-pass component and the coupling platform respectively; the cover plate seals the cavity, the tuning screw is passed through and fixed to the cover plate, the tuning screw is located directly above the resonator, and a certain distance is between the tuning screw and the resonator.

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