A cavity filter tuning fixture

Abstract

This application relates to the technical field of communication equipment testing and discloses a cavity filter tuning fixture. The fixture includes a test base, a tuning fixing block, and a tuning clamp. The filter under test (DUT) is placed on top of the test base, and the tuning fixing block is mounted on top of the DUT. The tuning fixing block is detachably connected to the test base, and the tuning clamp is movably connected to the bottom of the test base. The tuning fixing block has a first guide hole, and the top interface of the DUT is inserted into the bottom end of the first guide hole. A test cable interface passes through the top end of the first guide hole and connects to the top interface of the DUT. A guide step protrudes from the top of the test base, and the guide step has a second guide hole. The guide step is inserted into the bottom interface of the DUT, and another test cable interface passes through the bottom end of the second guide hole and connects to the bottom interface of the DUT. The tuning clamp engages with the test cable interface. This application enables rapid installation of 5G filters onto the test fixture, saving assembly time and improving production efficiency.

Description

Technical Field

[0001] This application relates to the technical field of communication equipment testing, and in particular to a cavity filter tuning fixture. Background Technology

[0002] In the field of communication equipment manufacturing, cavity filters must undergo rigorous debugging and testing processes before leaving the factory to ensure that their performance meets standard requirements. For 5G products, due to the high-frequency and high-speed characteristics of their communication technology, the accuracy requirements for cavity filters are even more stringent.

[0003] Currently, the common method for filter testing is to directly insert the test cable into the product. This method has many drawbacks. It not only easily damages the test cable but also introduces significant testing errors due to the difficulty in ensuring the cable's perpendicularity. Furthermore, given the unique design of new 5G products, existing testing procedures cannot achieve effective and rapid testing, resulting in significant time waste and hindering the guarantee of product quality and production efficiency, severely restricting the improvement of production efficiency.

[0004] Therefore, developing a dedicated test fixture for 5G filter products to solve the problems existing in the current testing and commissioning methods has become an urgent technical challenge. Utility Model Content

[0005] The technical problem to be solved by this application is to provide a cavity filter tuning and testing fixture that can quickly install 5G filter products onto the test fixture, thereby saving assembly time, ensuring product quality, and improving production efficiency.

[0006] To address the aforementioned issues, this application provides a cavity filter tuning fixture, comprising a tuning base, a tuning fixing block, and a tuning clamp. The filter under test is placed on top of the tuning base, the tuning fixing block is mounted on top of the filter under test and is detachably connected to the tuning base, and the tuning clamp is movably connected to the bottom of the tuning base. The tuning fixing block has a first guide hole through it, and the interface of the top of the filter under test is inserted into the first guide hole. The interface of a test cable passes through the top of the first guide hole and connects to the interface of the top of the filter under test. The top of the tuning base has a protruding guide step, and the guide step has a second guide hole through it. The guide step is inserted into the interface of the bottom of the filter under test, and the interface of another test cable passes through the bottom of the second guide hole and connects to the interface of the bottom of the filter under test. The tuning clamp engages the interface of the test cable.

[0007] Preferably, the adjustment fixture further includes a fastener, the adjustment base has a through-groove, and one end of the fastener passes through the through-groove and is detachably connected to the adjustment plate.

[0008] Preferably, the fastener is a screw, one end of which passes through the groove and is screwed to the adjustment plate.

[0009] Preferably, the test card has a fixing slot, and the interface of the test cable is snapped into the fixing slot.

[0010] Preferably, the adjustment card plate is also provided with a handle.

[0011] Preferably, the top of the adjustment base is provided with a number of support columns spaced apart along its perimeter.

[0012] Preferably, the top of the adjustment base is provided with a pin hole, and the positioning pin passes through the filter under test and is inserted into the pin hole.

[0013] Preferably, a heightening column is fixed to the bottom of the adjustment base, and the other end of the heightening column is fixedly connected to the base plate.

[0014] Preferably, the adjustment fixing block is detachably connected to the adjustment base via a buckle.

[0015] Compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0016] This testing fixture achieves precise testing through a three-dimensional collaborative positioning structure consisting of a testing base, a testing fixing block, and a testing clamp. The filter under test (DUT) is placed on top of the testing base, and the guide step on the top of the testing base inserts into the bottom interface of the DUT, achieving precise alignment of the bottom interface through a second guide hole. The testing fixing block is assembled on top of the DUT, with the bottom end of its first guide hole interlocking with the top interface of the DUT, forming vertical guiding constraints at both ends. The testing fixing block is detachably connected to the testing base at both ends along its length to clamp and fix the DUT between the testing base and the testing fixing block, preventing lateral displacement. The testing clamp is movably connected to the bottom of the testing base, and through the interface for engaging the test cable, it provides horizontal restraint for the test cable at the bottom.

[0017] This application solves the verticality deviation problem caused by traditional direct cable plugging by using the cooperation of the first guide hole, the second guide hole, and the adjustment fixing block. This avoids test errors caused by poor contact or cable movement, ensuring the high-precision testing requirements of 5G filters. This application changes the force distribution method of traditional direct cable plugging; the cable interface is supported and fixed by the adjustment fixing block and adjustment card, reducing plugging and unplugging losses and cable damage caused by long-term use, extending the life of the test equipment. For the non-traditional appearance design of 5G filters, a customized guide step and dual guide hole structure enable rapid alignment and installation, saving assembly time compared to traditional methods and significantly improving adjustment efficiency. Furthermore, the standardized positioning structure eliminates human error, reduces repeatability errors in test results, and ensures product quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the assembly of the adjustment fixture and the filter under test in an embodiment of this application.

[0020] Figure 2 This is an exploded view of the assembly of the adjustment fixture, the filter under test, and the positioning pin in the embodiments of this application.

[0021] Figure 3 This is a schematic diagram of the adjustment fixture in the embodiments of this application.

[0022] Figure 4 This is a structural schematic diagram of the adjustment fixture from another perspective in the embodiments of this application.

[0023] Explanation of reference numerals in the attached drawings: 1. Adjustment base; 11. Guide step; 12. Second guide hole; 13. Slide groove; 14. Support column; 15. Pin hole; 16. Heightening column; 17. Base plate; 2. Adjustment fixing block; 21. First guide hole; 3. Adjustment clamping plate; 31. Fixing groove; 32. Handle; 4. Filter under test; 41. Positioning hole; 5. Test cable; 6. Fastener; 7. Positioning pin; 8. Tower buckle. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] 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, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] Please refer to Figures 1 to 4 This application provides a cavity filter tuning and testing fixture for debugging and testing cavity filters. The fixture includes a tuning base 1, a tuning fixing block 2, and a tuning clamping plate 3. The filter under test 4 is placed on top of the tuning base 1. The tuning fixing block 2 is mounted on top of the filter under test 4, and both ends of the tuning fixing block 2 are detachably connected to the tuning base 1 along its length. The tuning clamping plate 3 is movably connected to the bottom of the tuning base 1. This embodiment is described in its normal operating state.

[0029] Specifically, the adjustment fixing block 2 has a first guide hole 21 extending vertically through it. The interface at the top of the filter under test 4 is inserted into the first guide hole 21. The interface of the test cable 5 passes through the top of the first guide hole 21 and connects to the interface at the top of the filter under test 4. The top of the adjustment base 1 has a protruding guide step 11. The guide step 11 has a second guide hole 12 extending through it. The guide step 11 is inserted into the interface at the bottom of the filter under test 4. The interface of another test cable 5 passes through the bottom of the second guide hole 12 and connects to the interface at the bottom of the filter under test 4. The adjustment plate 3 holds the interface of the test cable 5.

[0030] To address this, the testing fixture achieves precise testing through a three-dimensional collaborative positioning structure consisting of a testing base 1, a testing fixing block 2, and a testing clamping plate 3. The filter under test (DUT) 4 is placed on top of the testing base 1. The guide step 11 on the top of the testing base 1 is inserted into the bottom interface of the DUT 4, achieving precise alignment of the bottom interface through the second guide hole 12. The testing fixing block 2 is mounted on top of the DUT 4, with the bottom end of its first guide hole 21 interlocking with the top interface of the DUT 4, forming vertical guiding constraints at both ends. The testing fixing block 2 is detachably connected to the testing base 1 at both ends along its length to clamp and fix the DUT 4 between the testing base 1 and the testing fixing block 2, preventing lateral displacement. The testing clamping plate 3 is movably connected to the bottom of the testing base 1, and by clamping the interface of the test cable 5, it provides horizontal restraint to the test cable 5 at the bottom.

[0031] This application solves the verticality deviation problem caused by traditional direct cable plugging by using the cooperation of the first guide hole 21, the second guide hole 12, and the adjustment fixing block 2. This avoids test errors caused by poor contact or cable movement, ensuring the high-precision testing requirements of 5G filters. This application changes the force distribution method of traditional direct cable plugging; the cable interface is supported and fixed by the adjustment fixing block 2 and the adjustment card plate 3, reducing plugging and unplugging losses and cable damage caused by long-term use, thus extending the lifespan of the testing equipment. For the non-traditional appearance design of 5G filters, the customized guide step 11 and dual guide hole structure enable rapid alignment and installation, saving assembly time compared to traditional methods and significantly improving adjustment efficiency. Furthermore, the standardized positioning structure eliminates human error, reduces repeatability errors in test results, and ensures product quality.

[0032] Please refer to Figure 3 and Figure 4 In one specific embodiment, the adjustment fixture further includes a fastener 6. A sliding groove 13 is formed through the adjustment base 1, and one end of the fastener 6 passes through the sliding groove 13 and is detachably connected to the adjustment clamping plate 3. In this embodiment, the fastener 6 is a screw, and one end of the screw passes through the sliding groove 13 and is threadedly connected to the adjustment clamping plate 3. The detachable connection allows for quick assembly and disassembly of the adjustment clamping plate 3. Combined with the sliding adjustment function of the sliding groove 13, operators can adjust the clamping plate position through simple tightening and loosening operations without replacing the fixture body, significantly shortening the debugging preparation time and improving on-site operation efficiency.

[0033] The adjustment base 1 has a through-slot 13, which is a long, narrow guide structure. One end of the fastener 6 (such as a bolt or screw) passes through the slot 13 and is detachably connected to the adjustment clamping plate 3 (such as a threaded connection). By loosening the fastener 6, the adjustment clamping plate 3 can slide along the length of the slot 13, thereby adjusting the lateral position of the adjustment clamping plate 3 at the bottom of the adjustment base 1. When tightened, the fastener 6 fixes the adjustment clamping plate 3 in the target position, making it rigidly connected to the adjustment base 1. The rigid connection of the fastener 6 ensures that the adjustment clamping plate 3 does not loosen during testing, and the limiting design of the slot 13 prevents excessive displacement of the clamping plate, forming a three-level positioning system of "adjustable-fixed-stable". While satisfying flexibility, it ensures the mechanical stability of the overall fixture structure and is suitable for high-frequency, long-term industrial testing scenarios.

[0034] When testing cavity filters of different specifications or adapting to different types of test cables 5, the adjustment plate 3 can be slidable to align its locking structure with the positioning point of the cable interface, ensuring the accuracy of the locking position. Simultaneously, the guiding function of the slide groove 13 restricts the displacement direction of the adjustment plate 3, allowing it to move laterally only within a preset range, preventing deviation from the effective locking area. Through the adjustable connection structure between the slide groove 13 and the fastener 6, the adjustment plate 3 can adapt to test cables 5 of different sizes and interface positions, solving the problem of insufficient versatility caused by the fixed locking position of traditional fixtures, significantly expanding the applicability of the fixture, and reducing the development cost of dedicated fixtures for different products.

[0035] In one specific embodiment, a fixing groove 31 is provided on one side of the test card 3, and the interface of the test cable 5 is snapped into the fixing groove 31. In this embodiment, the fixing groove 31 is an open arc shape.

[0036] To address this, the inner wall curve of the fixing groove 31 conforms to the outer contour of the test cable 5 interface. When the cable interface is inserted into the fixing groove 31, the arc-shaped groove wall generates a uniform radial clamping force on the interface. Utilizing the friction of the curved surface contact and structural limiting, the cable interface is stably clamped within the fixing groove 31, effectively restricting the lateral displacement and circumferential rotation of the test cable 5 interface. The opening design of the fixing groove 31 provides a guiding entrance, facilitating quick alignment of the cable interface by the operator. During insertion, the arc-shaped groove wall automatically corrects the interface angle, ensuring that its axis is aligned with the axis of the second guide hole 12, achieving deviation-free docking. The arc-shaped structure has a certain elastic deformation space, which can accommodate cable interfaces with slight tolerances. During clamping, it tightly fits the interface surface through slight deformation, while avoiding interface damage caused by rigid clamping.

[0037] Furthermore, a handle 32 is provided on the side of the adjustment plate 3 away from the fixing groove 31. The handle 32, as an extension of the adjustment plate 3, is rigidly connected to the main body of the adjustment plate 3. The operator applies external force by pushing, pulling or lifting by holding the handle 32, converting the hand force into the displacement force of the adjustment plate 3, so as to realize the sliding adjustment or overall disassembly and assembly of the adjustment plate 3 along the slide groove 13 (or other guide structure) without the need for tools such as screwdrivers.

[0038] In one specific embodiment, the top of the test base 1 is provided with a plurality of support columns 14 spaced apart along the periphery, and the support columns 14 are used to support the filter under test 4.

[0039] To address this, several support columns 14 are arranged at intervals along the top periphery of the adjustment base 1 to form a ring support array. Their tops collectively bear the weight of the filter under test 4, distributing the gravity of the filter under test 4 to multiple support points on the adjustment base 1, thus preventing deformation of the adjustment base 1 or tilting of the filter under test 4 due to single-point stress. The height of the support columns 14 matches the height of the guide steps 11, ensuring that the bottom interface of the filter under test 4 automatically aligns with the second guide hole 12 of the guide steps 11 when placed, eliminating the need for additional leveling operations and forming a "placement-is-positioning" mechanical reference. After the support columns 14 lift the filter, they maintain a certain distance between the bottom surface of the filter and the top of the adjustment base 1, reserving operational space for the insertion of the bottom interface into the guide steps 11, while also preventing frictional damage or contamination that may occur if the bottom surface of the filter under test 4 directly contacts the surface of the adjustment base 1.

[0040] Please refer to Figure 1 and Figure 2 In one specific embodiment, the top of the test base 1 is also provided with a pin hole 15, and the positioning pin 7 passes through the filter under test 4 and is inserted into the pin hole 15. When the filter under test 4 is placed on the test base 1, its preset positioning hole 41 is aligned with the pin hole 15 on the top of the test base 1. The positioning pin 7 passes through the positioning hole 41 of the filter under test 4 and is inserted into the pin hole 15, forming a "pin-hole" rigid connection, thereby restricting the translational (X / Y direction) and rotational (Z direction) degrees of freedom of the filter under test 4 in the horizontal plane.

[0041] In one specific embodiment, a heightening post 16 is fixed to the bottom of the adjustment base 1 so that the test cable 5 can be inserted into the filter under test 4 from below the adjustment base 1; the end of the heightening post 16 away from the adjustment base 1 is fixedly connected to the base plate 17 to improve the stability of the adjustment fixture.

[0042] To address this, the riser column 16 is fixed to the bottom of the adjustment base 1, raising the adjustment base 1 to a certain height and creating an overhead space between the adjustment base 1 and the base plate 17. This provides vertical operating space for the test cable 5 to be inserted into the bottom interface of the filter under test 4 from below the adjustment base 1. The test cable 5 is inserted into the interface of the filter under test 4 through the second guide hole 12 at the bottom of the adjustment base 1, avoiding direct contact and friction with the desktop or equipment platform. The base plate 17 serves as the basic support surface of the adjustment fixture. By increasing the contact area (usually designed as a rectangular or circular plate) and the weight distribution, the overall center of gravity of the fixture is lowered within the range of the base plate 17, offsetting the lateral force generated by cable insertion and removal during the test, thus preventing the fixture from tipping over or shaking.

[0043] In one specific embodiment, the adjustment fixing block 2 is detachably connected to the adjustment base 1 via a buckle 8. The buckle 8 consists of a male buckle (such as a protrusion with barbs) fixed to the adjustment fixing block 2 and a female buckle (such as a groove with a slot) on the adjustment base 1. By pressing or sliding the adjustment fixing block 2, the male buckle is embedded into the slot of the female buckle, and the barb structure forms a mechanical lock, tightly pressing the adjustment fixing block 2 onto the top of the filter under test 4.

[0044] The male or female buckle of the snap fastener 8 integrates an elastic component (such as a spring sheet). When unlocking, applying external force (such as pulling upwards or pressing the unlock button) causes the barb to disengage from the slot. This elastic reset allows for rapid separation of the adjustment fixing block 2 from the adjustment base 1, without the need for screwdrivers or other tools. The snap fastener 8 is symmetrically arranged at both ends along the length of the adjustment fixing block 2. When locking, a balanced clamping force is applied simultaneously to ensure that the adjustment fixing block 2 and the adjustment base 1 are parallel and in contact, forming a uniform top pressure on the filter 4 under test, thus avoiding product deformation caused by localized stress concentration.

[0045] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cavity filter adjustment and testing fixture, characterized in that: The device includes a testing base, a testing fixing block, and a testing card plate. The filter under test is placed on top of the testing base, the testing fixing block is installed on top of the filter under test and is detachably connected to the testing base, and the testing card plate is movably connected to the bottom of the testing base. The adjustment and fixing block has a first guide hole through it. The interface at the top of the filter under test is inserted into the first guide hole. The interface of the test cable passes through the top of the first guide hole and is connected to the interface at the top of the filter under test. The top of the adjustment base is provided with a guide step, and the guide step passes through a second guide hole. The guide step is inserted into the interface at the bottom of the filter under test. The interface of another test cable passes through the bottom end of the second guide hole and is connected to the interface at the bottom of the filter under test. The adjustment card plate is snapped into the interface of the test cable.

2. The cavity filter adjustment fixture according to claim 1, characterized in that, The adjustment fixture also includes a fastener, and the adjustment base has a through-slot. One end of the fastener passes through the slot and is detachably connected to the adjustment plate.

3. The cavity filter adjustment fixture according to claim 2, characterized in that, The fastener is a screw, one end of which passes through the groove and is screwed to the adjustment plate.

4. The cavity filter adjustment fixture according to claim 1, characterized in that, The test card has a fixing slot, and the interface of the test cable is snapped into the fixing slot.

5. A cavity filter adjustment fixture according to claim 1, characterized in that, The test plate is also equipped with a handle.

6. The cavity filter adjustment fixture according to claim 1, characterized in that, The top of the adjustment base is provided with several support columns spaced apart along its perimeter.

7. The cavity filter adjustment fixture according to claim 1, characterized in that, The top of the test base is also provided with a pin hole, through which the positioning pin passes and is inserted into the pin hole.

8. A cavity filter adjustment fixture according to claim 1, characterized in that, The bottom of the adjustment base is fixed with a heightening column, and the other end of the heightening column is fixedly connected to the base plate.

9. A cavity filter adjustment fixture according to claim 1, characterized in that, The adjustment fixing block is detachably connected to the adjustment base via a buckle.

Images