Frequency adjustment device and filter

Abstract

The application relates to the field of filters, and discloses a frequency adjusting device and a filter. The frequency adjusting device comprises a shell, an adjusting rod and a limiting piece. The shell is provided with a mounting hole. The adjusting rod comprises a metal part, and an insulating part is arranged on the surface of the metal part. The insulating part is connected with the mounting hole. The limiting piece is located at the position of the mounting hole, and the limiting piece is connected with the metal part and part of the insulating part. The insulating part is arranged to wrap the metal part and is connected with the mounting hole. When the adjusting rod is screwed, only the insulating part is in contact and friction with the shell. The conductive metal debris is completely prevented from falling into the containing space. The abnormal local electric field distribution, the intermodulation characteristic fluctuation and the cumulative performance degradation risk of the filter caused by the conductive debris adhering to the surface of the resonant rod or the cavity are eliminated. Meanwhile, the design that the limiting piece is connected with the metal part and part of the insulating part realizes the axial positioning, provides a reliable grounding path for the metal part through the contact between the limiting piece and the shell, and ensures the stability of the electrical performance in the frequency adjusting process.

Description

Technical Field

[0001] This application relates to the field of filters, and more particularly to a frequency adjustment device and a filter. Background Technology

[0002] During the production and debugging of wireless communication base station filters, traditional all-metal debugging screws need to be repeatedly screwed into the threaded holes of the cover plate to adjust the resonant frequency. However, the friction between the metal screw and the metal cover plate inevitably generates tiny debris. After these conductive debris falls into the filter cavity, they adhere to the resonant rod or the surface of the cavity, causing abnormal local electric field distribution. Under conditions such as vibration, the debris may shift, causing changes in the signal path and resulting in fluctuations or even exceeding the limits of the filter's intermodulation characteristics. More seriously, debris contamination is insidious and cumulative, and may gradually degrade performance during later equipment operation, leading to a decrease in the overall stability of the device. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a frequency adjustment device and filter.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] This application provides:

[0006] A frequency adjustment device, comprising:

[0007] The housing has mounting holes.

[0008] An adjusting rod, the adjusting rod including a metal part, the metal part having an insulating part on its peripheral surface, the insulating part being connected to the mounting hole;

[0009] A limiting member is located at the mounting hole position and is connected to the metal part and part of the insulating part.

[0010] Furthermore, the housing includes a housing having an opening, a cover mounted on the housing for closing the opening, and the housing and the cover defining an accommodating space.

[0011] Furthermore, a sealing element is provided at the connection between the housing and the cover, and the limiting element is in contact with the cover.

[0012] Furthermore, the thickness of the cover is H, and the length of the insulating part along the axial direction is L, satisfying: L > H.

[0013] Furthermore, the metal part includes a threaded section and a smooth section, the smooth section being located at the end of the threaded section away from the insulating part, and the insulating part being disposed on the circumferential surface of the threaded section.

[0014] Furthermore, the diameter of the threaded section is D1, and the diameter of the smooth section is D2, satisfying the condition: D1 > D2.

[0015] Furthermore, the end face of the smooth rod segment facing away from the threaded segment is an arc surface.

[0016] Furthermore, a resonant component is provided in the accommodating space. The resonant component includes a mounting post disposed on the housing, a resonant rod disposed on the mounting post, and the resonant rod having a resonant cavity, which is directly opposite the mounting hole.

[0017] Furthermore, the resonant rod is U-shaped.

[0018] This application provides a filter including any of the frequency adjustment devices described in 1 to 9 above.

[0019] This application, by setting an insulating part to wrap around the metal part and connect it to the mounting hole, ensures that only the insulating part contacts and rubs against the housing when the adjustment rod is turned, completely avoiding the generation of conductive metal debris falling into the accommodating space. This eliminates the risk of abnormal local electric field distribution, intermodulation characteristic fluctuations, and cumulative degradation of filter performance caused by conductive debris adhering to the resonant rod or cavity surface. At the same time, the design of the limiting member connecting to the metal part and part of the insulating part achieves axial positioning while providing a reliable grounding path for the metal part through the contact between the limiting member and the housing, ensuring the stability of electrical performance during frequency adjustment.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall adjustment device of this application is shown;

[0023] Figure 2 A schematic diagram of the adjusting rod structure of this application is shown;

[0024] Figure 3 A schematic diagram of the overall structure of the adjustment device with multiple resonant components of this application is shown.

[0025] Explanation of key component symbols:

[0026] 100-Housing component; 101-Mounting hole; 110-Housing shell; 120-Cover; 130-Seal; 200-Adjusting rod; 210-Metal part; 211-Threaded section; 212-Smooth rod section; 220-Insulating part; 300-Limiting component; 400-Resonant assembly; 410-Mounting post; 420-Resonant rod; 421-Resonant cavity. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] This application provides a frequency adjustment device, which includes a housing 100, an adjustment rod 200, and a limiting member 300. Specifically, the housing 100 has a mounting hole 101, the adjustment rod 200 includes a metal part 210, and an insulating part 220 is provided on the peripheral surface of the metal part 210. The insulating part 220 is connected to the mounting hole 101, and the limiting member 300 is located at the position of the mounting hole 101. The limiting member 300 is connected to the metal part 210 and part of the insulating part 220.

[0033] This application achieves frequency adjustment by rotating the length of the metal part 210 extending into the housing 100. That is, the longer the metal part 210 extends into the housing 100, the lower the frequency. Similarly, the shorter the length extending into the housing 100, the higher the frequency. Therefore, the frequency adjustment can be achieved by rotating the metal part 210.

[0034] The existing adjustment rod 200 is made entirely of metal. During the process of screwing the adjustment rod 200 into the mounting hole 101, metal fragments may be generated at the threaded position and fall into the housing 100, thereby affecting the signal change and ultimately reducing the stability of the entire filter, which cannot meet the usage requirements.

[0035] See Figure 1 As shown, in this embodiment, to prevent metal debris from being generated during the tightening of the adjustment rod 200 and falling into the accommodating space of the housing 100, thereby potentially harming the electrical performance of the filter (such as electric field distribution and intermodulation characteristics), this application has made key improvements to the structure of the adjustment rod 200. Specifically, the adjustment rod 200 no longer adopts a traditional one-piece metal design, but is innovatively composed of two parts with different functions: a metal part 210 and an insulating part 220. Among them, the metal part 210 undertakes the core function of extending into the accommodating space for frequency adjustment; while the insulating part 220 is specifically responsible for mechanically connecting with the mounting hole 101 of the housing 100.

[0036] To completely prevent direct contact and friction between the metal part 210 and the internal thread of the mounting hole 101 during tightening, the insulating part 220 is securely mounted on the outer circumferential surface of the metal part 210. This bonding is typically achieved through injection molding, bonding, or mechanical assembly. More importantly, the outer surface of the insulating part 220 is precision-machined with an external thread structure, ensuring a stable and reliable threaded connection with the internal thread of the mounting hole 101. Thus, during the entire frequency adjustment operation, when the operator tightens the metal part 210, it causes the insulating part 220 to rotate, allowing the adjusting rod 200 to move smoothly axially within the mounting hole 101.

[0037] Because the insulating part 220 is made of a non-metallic material (such as engineering plastic), it is not conductive. Therefore, even during repeated tightening operations, tiny debris inevitably forms between the external thread of the insulating part 220 and the internal thread of the mounting hole 101. This debris is also a non-conductive insulating material. Even if a small amount of insulating debris falls into the accommodating space of the housing 100, it will not adhere to the resonant rod 420 or the cavity surface to form a conductive path, thus avoiding risks such as distortion of local electric field distribution, changes in signal path, or deterioration of intermodulation characteristics. This design fundamentally solves the key problem of conductive metal debris generated by inter-metal friction during the tightening process of the traditional all-metal adjusting rod 200, which, after falling into the housing 100, has a serious negative impact on the stability, reliability, and long-term performance of the filter signal transmission.

[0038] It should be noted that in this embodiment, the insulating part 220 is always connected to the mounting hole 101 during the screwing process of the metal part 210. That is to say, the metal part 210 is never connected to the mounting hole 101 during the entire screwing and adjustment process.

[0039] In this embodiment, the limiting member 300 is a nut.

[0040] Please continue reading. Figure 1 and Figure 2As shown, in order to fix the position of the metal part 210 and ground it, a limiting member 300 is connected to the metal part 210. It should be noted that the limiting member 300 is grounded by contacting the outer wall of the housing 100. Since the metal part 210 and the housing 100 are isolated by the insulating part 220, this application uses the limiting member 300 as an intermediate medium to achieve grounding. Specifically, the limiting member 300 is threadedly connected to the metal part 210. Since the insulating part 220 is always connected to the mounting hole 101, in the initial state and during the screwing of the metal part 210, a part of the insulating part 220 will always protrude from the opening of the mounting hole 101, that is, protrude from the surface of the housing 100. Therefore, a part of the insulating part 220 will be connected to the limiting member 300. That is, the limiting member 300 will be connected to both the metal part 210 and the insulating part 220 at the same time, thereby grounding the metal part 210 and ensuring the electrical performance stability and signal integrity of the filter during the debugging process.

[0041] In this embodiment, the metal part 210 is made of metal and the insulating part 220 is made of plastic. Insulation is achieved by using plastic. In addition to plastic, other insulating materials can also be used for the insulating part 220. No specific limitation is made here.

[0042] Understandably, by employing a structure in which an insulating part 220 is provided on the circumferential surface of the metal part 210 and connected to the mounting hole 101, this application ensures that only the insulating part 220 contacts the housing 100 when the adjusting rod 200 is turned. This completely avoids the problem of conductive metal debris generated by direct friction between the metal part 210 and the mounting hole 101, thereby eliminating the risk of abnormal electric field distribution, intermodulation characteristic fluctuations, and cumulative degradation of filter performance caused by debris falling into the accommodating space. At the same time, the design of the limiting member 300 connecting to the metal part 210 and part of the insulating part 220, while achieving axial positioning of the adjusting rod 200, provides a grounding path for the metal part 210 through the contact between the limiting member 300 and the outer wall of the housing 100, ensuring the stability of electrical performance during frequency adjustment.

[0043] In some specific embodiments, the housing 100 includes a housing 110 having an opening, a cover 120 mounted on the housing 110 for closing the opening, and the housing 110 and the cover 120 defining an accommodating space.

[0044] Please see Figure 1 As shown, mounting hole 101 is formed on cover 120, and mounting hole 101 has internal thread. Cover 120 is used to seal housing 110, preventing external dust and other debris from entering the installation space, thereby providing a stable electromagnetic environment and avoiding signal interference.

[0045] In this embodiment, the thickness of the cover 120 is H, and the length of the insulating part 220 along the axial direction is L, satisfying: L > H.

[0046] See Figure 1 As shown, during the axial movement of the metal part 210 by screwing, in order to prevent it from contacting the inner wall of the mounting hole 101, the insulating part 220 needs to be always connected to the mounting hole 101. Therefore, the axial length of the insulating part 220 needs to be greater than the thickness of the cover 120, so as to ensure that the insulating part 220 is always connected to the mounting hole 101 on the cover 120.

[0047] In this embodiment, a sealing member 130 is provided at the connection between the housing 110 and the cover 120, and the limiting member 300 is in contact with the cover 120.

[0048] Please see Figure 1 As shown, in order to further improve the sealing performance of the cover 120 to the housing 110, a sealing element 130 is provided at the connection between the cover 120 and the housing 110. The sealing element 130 improves the sealing performance of the joint surface between the two, preventing external dust or particles from entering the accommodating space through the joint surface between the housing 110 and the cover 120.

[0049] For example, the seal 130 is a sealing strip, but it can also be a sealing ring or other component that can achieve a seal. The specific type and model of the seal 130 will not be described here.

[0050] In some specific embodiments, the metal part 210 includes a threaded section 211 and a smooth section 212, the smooth section 212 being located at the end of the threaded section 211 facing away from the insulating part 220, and the insulating part 220 being disposed on the circumferential surface of the threaded section 211.

[0051] Please continue reading. Figure 1 and Figure 2 As shown, grounding is achieved by connecting the threaded section 211 to the limiting member 300, while the smooth section 212 extends into the housing 100 to achieve frequency adjustment. That is, the threaded section 211 mainly achieves the connection, while the smooth section 212 is used to adjust the frequency by extending the length. In this embodiment, the threaded section 211 and the smooth section 212 are integrally formed to ensure the connection strength between the threaded section 211 and the smooth section 212.

[0052] In some specific embodiments, the diameter of the threaded section 211 is D1, and the diameter of the smooth section 212 is D2, satisfying: D1 > D2.

[0053] Please see Figure 2As shown, the diameter of the smooth rod section 212 is smaller than that of the threaded section 211 to accommodate the resonant cavity 421 of the resonant rod 420. When the smooth rod section 212 extends into the resonant cavity 421, it forms a uniform annular gap. The threaded section 211 has external threads on its surface. By setting the smooth rod through the smooth rod section 212, the electric field distortion caused by the thread tips is avoided, thus ensuring the stability of the resonant frequency.

[0054] In some specific embodiments, the end face of the smooth rod segment 212 facing away from the threaded segment 211 is an arc surface.

[0055] Please see Figure 2 As shown, since the smooth rod segment 212 needs to extend into the resonant cavity 421, the end of the smooth rod segment 212 is set as an arc surface to avoid the formation of charge accumulation points at the sharp edge in the high voltage electric field, thus preventing the occurrence of tip discharge phenomenon.

[0056] In some specific embodiments, a resonant component 400 is provided in the accommodating space. The resonant component 400 includes a mounting post 410 disposed on the housing 110. A resonant rod 420 is disposed on the mounting post 410. The resonant rod 420 has a resonant cavity 421, which is directly opposite the mounting hole 101.

[0057] Please see Figure 1 and Figure 3 As shown, the mounting post 410 is fixedly installed on the inner bottom wall of the housing 110. Specifically, the mounting post 410 is integrally formed with the housing 110, and the mounting post 410 is positioned directly opposite the mounting hole 101. The resonant rod 420 is fixedly installed on the mounting post 410, so that the resonant cavity 421 of the resonant rod 420 is directly opposite the mounting hole 101. Thus, during the twisting of the metal part 210, the bare rod section 212 can be inserted into the resonant cavity 421 to achieve frequency adjustment.

[0058] Please continue reading. Figure 1 and Figure 3 As shown, a connecting hole is provided on the upper surface of the mounting post 410, and a through hole is provided at the center of the resonant rod 420. A bolt can be screwed into the connecting hole on the upper surface of the mounting post 410 through the through hole, thereby fixing the resonant rod 420 on the mounting post 410 and realizing the installation of the resonant rod 420.

[0059] In this embodiment, the resonant rod 420 is U-shaped.

[0060] Please see Figure 3 As shown, a plurality of resonant components 400 are provided in the accommodating space of the housing 100. Correspondingly, a plurality of mounting holes 101 are opened on the cover 120, and a plurality of adjusting rods 200 are screwed into the mounting holes 101 at the corresponding positions.

[0061] This application also provides a filter that includes any of the frequency adjustment devices described above.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A frequency adjustment device, characterized in that, include: A housing (100) having a mounting hole (101) thereon; An adjusting rod (200) includes a metal part (210) and an insulating part (220) is provided on the circumferential surface of the metal part (210). The insulating part (220) is connected to the mounting hole (101). A limiting member (300) is located at the mounting hole (101) and is connected to the metal part (210) and part of the insulating part (220).

2. The frequency adjustment device according to claim 1, characterized in that, The housing (100) includes a housing (110) having an opening, and a cover (120) mounted on the housing (110) for closing the opening. The housing (110) and the cover (120) define an accommodating space.

3. The frequency adjustment device according to claim 2, characterized in that, A sealing element (130) is provided at the connection between the housing (110) and the cover (120), and the limiting element (300) is in contact with the cover (120).

4. The frequency adjustment device according to claim 2, characterized in that, The cover (120) has a thickness of H, and the insulating part (220) has a length of L along the axial direction, satisfying: L > H.

5. The frequency adjustment device according to claim 1, characterized in that, The metal part (210) includes a threaded section (211) and a smooth section (212). The smooth section (212) is located at the end of the threaded section (211) away from the insulating part (220). The insulating part (220) is disposed on the circumferential surface of the threaded section (211).

6. The frequency adjustment device according to claim 5, characterized in that, The diameter of the threaded section (211) is D1, and the diameter of the smooth section (212) is D2, satisfying that: D1 > D2.

7. The frequency adjustment device according to claim 5, characterized in that, The end face of the smooth rod section (212) facing away from the threaded section (211) is an arc surface.

8. The frequency adjustment device according to claim 2, characterized in that, The accommodating space is provided with a resonant component (400), the resonant component (400) includes a mounting post (410) disposed on the housing (110), a resonant rod (420) disposed on the mounting post (410), the resonant rod (420) has a resonant cavity (421), the resonant cavity (421) is directly opposite the mounting hole (101).

9. The frequency adjustment device according to claim 8, characterized in that, The resonant rod (420) is U-shaped.

10. A filter, characterized in that, Includes the frequency adjustment device as described in any one of claims 1 to 9.

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