Filter test tool

Abstract

The utility model relates to the technical field of test tools, and provides a filter test tool, which comprises a base and a test circuit board, and is characterized in that the base is used for supporting a filter; the test circuit board is installed on the base and provided with a conductive part, a wiring terminal and shielding rings, the conductive part is used for being in contact conduction with an inner conductor of the filter, the wiring terminal is electrically connected with the conductive part, and the shielding rings are arranged around the conductive part at intervals. Wherein the shielding ring surrounds the conductive part and the inner conductor which is in contact conduction with the conductive part without a dead angle, so that signal interference and signal leakage are avoided, and the shielding effect is good; the filter is directly surface-mounted on the test circuit board and is consistent with the use scene of the filter, and the test result is consistent with the final use scene, so that the electrical indexes in the actual use scene are kept consistent after the test is qualified.

Description

Technical Field

[0001] The utility model relates to the technical field of test tooling, in particular to a filter test tooling. Background Art

[0002] In actual use scenarios, filters are surface-mounted on a PCB (Printed Circuit Board) through the SMT (Surface Mounted Technology) process. The inner conductor of the filter is electrically connected to the signal terminals fixed on the PCB to achieve signal input and output. The filter allows signals within a certain frequency band to pass through with minimal loss and suppresses signals in other frequency bands, thereby playing a role in selecting signals in the required frequency band.

[0003] During the existing filter testing, the inner conductor of the filter is connected to the inner core of the connector, and then electrically connected to the test equipment through the connector and wires to test whether the filter meets the expected electrical specifications. During the testing process, the test environment of the filter does not include using a PCB. After the filter passes the test, since the test environment is not completely consistent with the actual use environment, there is still a technical problem of poor electrical specification consistency during actual use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a filter test tooling, aiming to solve the technical problem of poor electrical specification consistency after the existing filter passes the test.

[0005] The present application provides a filter test tooling, and the filter test tooling includes:

[0006] A base for supporting the filter;

[0007] A test circuit board installed on the base, the test circuit board is provided with a conductive member, a wiring terminal and a shielding ring. The conductive member is used to contact and conduct with the inner conductor of the filter, the wiring terminal is electrically connected to the conductive member, and the shielding ring is arranged around the conductive member at intervals.

[0008] In one embodiment, the shielding ring is an elastic ring. The side of the test circuit board close to the filter is the first side, and the initial height of the shielding ring protruding from the first side is greater than the height of the conductive member protruding from the first side.

[0009] In one embodiment, the shielding ring is an elastic rubber ring; the elastic rubber ring is disposed on the surface of the test circuit board close to the filter by dispensing glue.

[0010] In one embodiment, the conductive member is elastic so that the conductive member is in elastic contact with the inner conductor of the filter.

[0011] In one embodiment, the inner diameter of the shielding ring is 1.5 to 3 times the outer diameter of the conductive member.

[0012] In one embodiment, the test circuit board is provided with a hollow groove penetrating the test circuit board in the thickness direction of the test circuit board, and the hollow groove is located outside the shielding ring.

[0013] In one embodiment, the angle at which the hollow groove surrounds the shielding ring is at least 90°.

[0014] In one embodiment, the hollow groove includes an arc-shaped groove and two straight grooves. The arc-shaped groove is disposed around the outside of the shielding ring, and the two straight grooves are respectively communicated with two ends of the arc-shaped groove.

[0015] In one embodiment, the base is provided with two first limiting plates. The two first limiting plates are spaced along a first direction, and a spacing between the two first limiting plates forms a limiting space for accommodating the filter. The test circuit board is located on one side of the limiting space in a second direction, and the first direction and the second direction are perpendicular.

[0016] In one embodiment, in a projection along the second direction, the conductive member is located between the two first limiting plates, and the wiring terminal is located outside the two first limiting plates.

[0017] In one embodiment, a second limiting plate is mounted on the top of at least one of the first limiting plates, and the second limiting plate extends into the limiting space along the first direction.

[0018] In one embodiment, the base is provided with a support plate erected thereon, and the test circuit board is fixedly mounted on the support plate.

[0019] The beneficial effects of the filter test tooling provided by the present utility model are as follows: The base supports the test circuit board, ensuring the position stability and reliability of the test circuit board during the filter test. The conductive component of the test circuit board is in contact and conduction with the inner conductor of the filter to be tested, enabling the inner conductor to be in conduction with the wiring terminal through the conductive component, facilitating the electrical connection between the filter and external test equipment. The shielding ring is arranged to surround the conductive component and the inner conductor in contact and conduction with the conductive component without dead angles, avoiding signal interference and signal leakage, and having a good shielding effect. Among them, the filter is directly surface-mounted on the test circuit board, which is consistent with the usage scenario of the filter, and the test results are consistent with the final usage scenario, solving the technical problem of poor electrical index consistency after the existing filters pass the test, and ensuring that the electrical indexes remain consistent in the actual usage scenario after passing the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the use of the filter test tooling provided by the embodiment of the present utility model;

[0022] Figure 2 is Figure 1 a cross-sectional view of the filter test tooling in along the A-A line;

[0023] Figure 3 is Figure 2 a partial enlarged view of part A in ;

[0024] Figure 4 is Figure 1 a schematic diagram of the structure of the filter in ;

[0025] Figure 5 is a schematic diagram of the structure of the filter test tooling provided by the embodiment of the present utility model;

[0026] Figure 6 is an assembly schematic diagram of the test circuit board of the filter test tooling provided by the embodiment of the present utility model;

[0027] Figure 7 Another assembly schematic diagram of the test circuit board of the filter test tooling provided by the embodiment of the present utility model;

[0028] Figure 8 is a schematic diagram of the structure of the base of the filter test tooling provided by the embodiment of the present utility model.

[0029] Among them, the reference numerals in the figures are as follows:

[0030] X, the first direction; Y, the second direction; Z, the third direction;

[0031] 10, filter; 11, inner conductor; 12, cavity; 13, signal input port; 14, signal output port;

[0032] 100, base; 110, first limiting plate; 111, limiting space; 120, second limiting plate; 130, support plate; 131, avoidance groove; 140, limiting groove; 150, slide rail;

[0033] 200, test circuit board; 201, first side; 202, second side; 210, hollow groove; 211, arc groove; 212, straight groove;

[0034] 310, conductive part; 320, terminal; 330, shielding ring;

[0035] 400, pressing device; 410, pressing plate. Detailed implementation manners

[0036] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which 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 by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0037] Referring to "one embodiment" or "embodiments" throughout the specification means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least one embodiment of the present application. Therefore, the phrases "in one embodiment" or "in some embodiments" appearing throughout the specification do not all refer to the same embodiment. In addition, in one or more embodiments, the specific features, structures, or characteristics may be combined in any suitable manner.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0039] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0040] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] Combined with Figures 1 to 3 , the filter test tooling provided by this application includes a base 100 and a test circuit board 200. The base 100 is used to support the filter 10. The test circuit board 200 is installed on the base 100. The test circuit board 200 is provided with a conductive member 310, a terminal 320, and a shielding ring 330. The conductive member 310 is used to contact and conduct with the inner conductor 11 of the filter 10. The terminal 320 is electrically connected to the conductive member 310. The shielding ring 330 is arranged around the conductive member 310 at intervals.

[0042] Among them, the base 100 supports the test circuit board 200 to ensure the position stability and reliability of the test circuit board 200 during the test. The conductive member 310 of the test circuit board 200 contacts and conducts with the inner conductor 11 of the filter 10 to be tested, so that the inner conductor 11 is conducted with the terminal 320 through the conductive member 310, facilitating the electrical connection between the filter 10 and an external test device. The shielding ring 330 is arranged around the conductive member 310 and the inner conductor 11 in contact with the conductive member 310 without dead angles, avoiding signal interference and signal leakage, and having a good shielding effect. In the test tooling provided in this embodiment, the filter 10 is directly surface-mounted on the test circuit board 200, which is consistent with the usage scenario of the filter 10, and the test result is consistent with the final usage scenario, ensuring that the electrical indicators are consistent in the actual usage scenario after passing the test.

[0043] In this embodiment, combined with Figure 2 and Figure 4, the filter 10 includes a cavity 12 and an inner conductor 11. The cavity 12 has a signal input port 13 and a signal output port 14. The number of inner conductors 11 is at least two, with at least one inner conductor 11 installed at the signal input port 13 and at least one inner conductor 11 installed at the signal output port 14, so as to realize the input of the radio frequency signal into the interior of the cavity 12 of the filter 10 and the output from the interior of the cavity 12 of the filter 10. The inner conductor 11 can protrude from the outer side wall of the cavity 12, be flush with the outer side wall of the cavity 12, or be located inside the cavity 12, which is not limited herein.

[0044] In this embodiment, in combination with Figure 3 , Figure 6 and Figure 7 , the test circuit board 200 has a first side 201 and a second side 202 in its thickness direction. The first side 201 faces the filter 10 relative to the second side 202, and the second side 202 faces away from the filter 10 relative to the first side 201.

[0045] Specifically, the conductive member 310 can be a metal sleeve, a microstrip line, a pad, a metal sheet, a metal column, a metal probe, etc., which is not limited herein. The conductive member 310 protrudes from the first side 201 to contact and conduct with the inner conductor 11 of the filter 10. Alternatively, the conductive member 310 does not protrude from the first side 201, but the inner conductor 11 protrudes from the outer side wall of the cavity 12, so that the inner conductor 11 and the conductive member 310 are in contact and conduct. The conductive member 310 can be installed on the first side 201 or the second side 202. For example, the conductive member 310 is installed on the second side 202 and extends to the first side 201 through the through hole of the test circuit board 200, so as to be electrically connected to the filter 10 located on the first side 201. The conductive member 310 can be arranged on the test circuit board 200 by means of bonding, welding, clamping, integral molding, fastener connection or screw connection, etc., which is not limited herein.

[0046] Specifically, the shielding ring 330 can be installed on the first side 201 or the second side 202. The shielding ring 330 protrudes from the first side 201 and is arranged around the connection position of the conductive member 310 and the inner conductor 11 to realize signal shielding and prevent signal leakage. The wiring terminal 320 can be installed on the first side 201 or the second side 202. The shielding ring 330 can be arranged on the test circuit board 200 by means of bonding, welding, clamping, integral molding, fastener connection or screw connection, etc., which is not limited herein.

[0047] Specifically, the terminal 320 may protrude from the first side surface 201 or the second side surface 202, which is not limited herein. Optionally, the terminal 320 and the conductive member 310 may be electrically connected through a connection circuit. For example, the connection circuit may be located in the interlayer of the test circuit board 200. Alternatively, the connection circuit is laid on one surface of the test circuit board 200. The connection circuit may be on the same side surface as the terminal 320 or on a different side surface from the terminal 320, which is not limited herein.

[0048] In this embodiment, the number of the conductive members 310, the shielding rings 330, and the terminals 320 is the same as the number of the inner conductors 11. Each of the conductive members 310 is in contact conduction with each of the inner conductors 11 in one-to-one correspondence. Each of the shielding rings 330 is disposed around the corresponding conductive member 310 to prevent signal interference between the inner conductors 11 and the conductive members 310. Each of the terminals 320 is electrically connected to the corresponding conductive member 310.

[0049] In some embodiments, in combination with Figure 3 、 Figure 5 and Figure 6 , the shielding ring 330 is an elastic ring. If the end of the shielding ring 330 or the outer sidewall of the cavity 12 is uneven, there may be a gap in the non-elastic contact between the shielding ring 330 and the cavity 12. However, by compressing the shielding ring 330, the shielding ring 330 can be pressed tightly against the outer sidewall of the cavity 12 to eliminate the gap. That is, through elastic extrusion, the shielding ring 330 is more easily compressed and sealed in contact with the outer sidewall of the cavity 12, reducing the flatness requirements for the end plane of the shielding ring 330 protruding from the first side surface 201 and the flatness requirements for the outer sidewall of the cavity 12. In this way, the shielding ring 330 elastically abuts against the outer sidewall of the cavity 12 to achieve close contact with the outer sidewall of the cavity 12, enhancing the shielding effect and reducing the risk of signal interference and leakage.

[0050] In addition, the shielding ring 330 is elastically pressed against the outer sidewall of the cavity 12. On the one hand, it can adapt to the manufacturing tolerances of the inner conductor 11 and the conductive member 310. By elastically compressing the shielding ring 330, the inner conductor 11 and the conductive member 310 can be brought closer to each other for contact conduction, and poor contact between the two due to manufacturing tolerances can be avoided, reducing the manufacturing precision requirements for the inner conductor 11 and the conductive member 310. On the other hand, by changing the elastic compression amount of the shielding ring 330, it can be applicable to the contact electrical connection between inner conductors 11 of different lengths and conductive members 310 of different heights, improving the versatility of the test tooling. On the other hand, it realizes the flexible contact between the test circuit board 200 and the filter 10, avoiding the rigid pressing of the shielding ring 330 on the cavity 12, preventing damage to the inner conductor 11 or causing the position deviation of the inner conductor 11 resulting in distorted test results, which is beneficial to improving the test safety and reliability.

[0051] Generally, the inner conductor 11 of the filter 10 does not protrude beyond the outer sidewall of the cavity 12. For example, the inner conductor 11 is flush with the outer sidewall of the cavity 12 or is located inside the cavity 12, avoiding the exposure of the inner conductor 11 on the outer sidewall of the cavity 12 and being prone to wear. At the same time, it ensures that the outside of the filter 10 in the cavity 12 is simple and beautiful. When the filter 10 is assembled with other structures, it can basically avoid colliding with other structures and affecting the product indicators, and can reduce the overall width of the filter 10.

[0052] In one embodiment, in combination with Figure 3 , Figure 5 and Figure 6 , the initial height by which the shielding ring 330 protrudes beyond the first side 201 is greater than the height by which the conductive member 310 protrudes beyond the first side 201. At this time, through elastic compression of the shielding ring 330, the shielding ring 330 is flush with the end of the conductive member 310, so that the shielding ring 330 and the conductive member 310 can respectively abut against the outer sidewall of the cavity 12 and the inner conductor 11 flush with the outer sidewall of the cavity 12. Alternatively, through elastic compression of the shielding ring 330, the end of the conductive member 310 protrudes beyond the end of the shielding ring 330, so that when the shielding ring 330 abuts against the outer sidewall of the cavity 12, the conductive member 310 extends into the cavity 12 and comes into contact and conduction with the inner conductor 11 located inside the cavity 12.

[0053] In this way, when the inner conductor 11 does not protrude beyond the outer sidewall of the cavity 12, the shielding ring 330 will necessarily be elastically pressed against the outer sidewall of the cavity 12, improving the contact tightness between the shielding ring 330 and the cavity 12, further improving the shielding effect, preventing signal interference and leakage, and enhancing the test accuracy.

[0054] It can be understood that in other embodiments, the inner conductor 11 of the filter 10 protrudes beyond the outer sidewall of the cavity 12. If the length by which the inner conductor 11 protrudes beyond the outer sidewall of the cavity 12 is less than the difference between the initial height of the shielding ring 330 and the protruding height of the conductive member 310, that is, when the uncompressed shielding ring 330 abuts against the outer sidewall of the cavity 12, the inner conductor 11 extends into the shielding ring 330, but there is still a gap between the inner conductor 11 and the conductive member 310. At this time, the shielding ring 330 can still be elastically compressed and pressed against the outer sidewall of the cavity 12, eliminating the gap between the inner conductor 11 and the conductive member 310, and at the same time improving the contact tightness between the shielding ring 330 and the cavity 12, which is beneficial to enhancing the test accuracy.

[0055] In some embodiments, in combination with Figure 3 , Figure 5 and Figure 6 , the shielding ring 330 is an elastic rubber ring. The material of the elastic rubber ring itself has elasticity and a good sealing effect. There is no need to additionally set an elastic structure, which simplifies the structure of the shielding ring 330 itself, simplifies the installation requirements of the shielding ring 330 and the test circuit board 200, and reduces the manufacturing cost of the shielding ring 330.

[0056] Specifically, the elastic rubber ring is disposed on the surface of the test circuit board 200 close to the filter 10 by dispensing glue. Based on this, the staff or the glue dispensing device can directly process the elastic rubber ring on the surface of the test circuit board 200 by means of dispensing glue, without special requirements for the surface of the test circuit board 200. The test circuit board 200 does not need to be processed with a limiting structure for the assembly of the elastic rubber ring, and no additional assembly operation is required between the test circuit board 200 and the elastic rubber ring, so that the position accuracy between the test circuit board 200 and the shielding ring 330 is high and the assembly consistency is good, simplifying the processing technology and assembly technology of the shielding ring 330 and reducing the manufacturing cost. At the same time, the shape, position, size and thickness of the elastic rubber ring can be flexibly set by dispensing glue, which is beneficial to accurately control the structure of the shielding ring 330. By optimizing its thickness, it can be ensured that the shielding ring 330 can elastically abut against the outer side wall of the cavity 12 stably.

[0057] It can be understood that in other embodiments, the shielding ring 330 can also be a metal sheet, and the metal sheet has elasticity through folding, so that it can elastically abut against the outer side wall of the cavity 12. Of course, the shielding ring 330 can also be a conductive fabric, an elastic metal wire, etc., which are not limited herein.

[0058] In some embodiments, in combination with Figure 3 、 Figure 5 and Figure 6 , the conductive member 310 has elasticity so that the conductive member 310 is in elastic contact with the inner conductor 11 of the filter 10. Based on this, on the one hand, the conductive member 310 is in flexible contact with the inner conductor 11 of the filter 10, avoiding hard contact between the conductive member 310 and the inner conductor 11, reducing the friction and wear between the two, and avoiding deformation or offset of the inner conductor 11 caused by pressing, which may lead to inaccurate test electrical indicators, and is beneficial to improving the test safety and reliability; on the other hand, it can adapt to the manufacturing tolerances of the inner conductor 11 and the conductive member 310. By elastically compressing the conductive member 310, it is ensured that the two can be stably contacted and well-conducted, and the contact between the two is not affected by the manufacturing tolerance, reducing the manufacturing accuracy and installation accuracy requirements of the inner conductor 11 and the conductive member 310.

[0059] Specifically, the elastic conductive member 310 is a spring pin or a bent metal sheet, etc., which are not limited herein.

[0060] In some embodiments, in combination with Figure 5 and Figure 6 , the inner diameter of the shielding ring 330 is 1.5 times to 3 times the outer diameter of the conductive member 310, which is beneficial to having an effective matching impedance between the shielding ring 330 and the conductive member 310, reducing signal reflection and loss, reducing interference and crosstalk between signals, and ensuring the stability and consistency of the signal during transmission. Maintain the clarity and accuracy of the signal.

[0061] Optionally, the outer diameter of the conductive member 310 is 2 mm to 2.5 mm. For example, the outer diameter of the conductive member 310 is 2 mm, 2.2 mm, 2.3 mm, or 2.5 mm.

[0062] Optionally, the inner diameter of the shielding ring 330 is 4.5 mm to 6.5 mm. For example, the inner diameter of the shielding ring 330 is 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, or 6.5 mm.

[0063] In some embodiments, in combination with Figures 5 to 7 , the test circuit board 200 is provided with a hollow groove 210 penetrating through the test circuit board 200 along the thickness direction of the test circuit board 200, and the hollow groove 210 is located outside the shielding ring 330. The area of the test circuit board 200 near the hollow groove 210 can deflect and deform along the thickness direction. When the shielding ring 330 abuts against the outer sidewall of the cavity 12, or when the conductive member 310 abuts against the inner conductor 11, the conductive member 310 and the shielding ring 330 near the hollow groove 210 can elastically deform along the thickness direction with the deflection deformation of a part of the test circuit board 200, reducing the impact force borne by the shielding ring 330 and the conductive member 310, and reducing the risk of damage to the shielding ring 330 and the conductive member 310.

[0064] In addition, the deflection deformation helps to adjust the positions of the shielding ring 330 and the conductive member 310 in the thickness direction of the test circuit board 200. On the one hand, it can adapt to the manufacturing tolerances and assembly errors of the inner conductor 11, the shielding ring 330, and the conductive member 310, and does not cause poor contact or poor shielding due to manufacturing tolerances and assembly tolerances, reducing the requirements for the manufacturing precision and assembly precision of the inner conductor 11, the shielding ring 330, and the conductive member 310; on the other hand, the deflection deformation generates an elastic restoring force, stably pressing the conductive member 310 against the inner conductor 11, and stably sealing the shielding ring 330 against the outer sidewall of the cavity 12, improving the stability and reliability of the test.

[0065] In one of the embodiments, in combination with Figure 6 and Figure 7 , the angle by which the hollow groove 210 surrounds the shielding ring 330 is at least 90°. An angle of more than 90° increases the amount of flexural deformation of the part of the test circuit board 200 provided with the conductive member 310 and the shielding ring 330, can adapt to larger manufacturing tolerances and assembly tolerances, provides a greater elastic restoring force to ensure stable contact and conduction between the conductive member 310 and the inner conductor 11, and stable sealing of the shielding ring 330 against the cavity 12, and at the same time provides more buffering effects, effectively reducing the influence of external impact or vibration on the shielding ring 330 and the conductive member 310.

[0066] Optionally, the angle by which the hollow groove 210 surrounds the shielding ring 330 is 90°, 120°, 150°, 180°, 200°, 220°, 250°, or 300°.

[0067] Optionally, the angle by which the hollow groove 210 surrounds the shielding ring 330 is 180° to 300°.

[0068] In one embodiment, in combination with Figure 6 and Figure 7 , the hollow groove 210 includes an arc-shaped groove 211 and two linear grooves 212. The arc-shaped groove 211 is disposed around the outside of the shielding ring 330, and the two linear grooves 212 are respectively communicated with the two ends of the arc-shaped groove 211. The design of the two linear grooves 212 enables the test circuit board 200 to have a cantilever structure, and the conductive member 310 and the shielding ring 330 are disposed at the end of the cantilever, further increasing the deflection deformation amount of the conductive member 310 and the shielding ring 330, enabling adaptation to greater manufacturing tolerances and assembly tolerances, and increasing the elastic restoring force of the conductive member 310 and the shielding ring 330.

[0069] Optionally, the two linear grooves 212 may be arranged in parallel with each other, or may gradually approach or gradually move away from each other in a direction away from the arc-shaped groove 211, which is not limited herein.

[0070] In some embodiments, in combination with Figure 1 , Figure 5 and Figure 8 , the base 100 is provided with two first limiting plates 110. The two first limiting plates 110 are spaced apart along the first direction X, and the space between the two first limiting plates 110 forms a limiting space 111 for accommodating the filter 10. The limiting space 111 limits the position stability of the filter 10 in the first direction X, improves the position accuracy of the filter 10 on the test fixture, facilitates the assembly of the filter 10 and the alignment and conduction between the inner conductor 11 and the conductive member 310, and at the same time prevents the filter 10 from shifting or shaking during the test, improving the test stability.

[0071] In one embodiment, in combination with Figure 1 , Figure 5 and Figure 8 , the test circuit board 200 is located on one side of the limiting space 111 in the second direction Y, and the first direction X and the second direction Y are perpendicular. Thus, the filter 10 is accurately positioned within the limiting space 111, is blocked by the first limiting plate 110 in the first direction X to maintain position stability, and the filter 10 can only strictly translate along the second direction Y, ensuring accurate contact and conduction between the inner conductor 11 of the filter 10 and the conductive member 310 of the test circuit board 200 located in the second direction Y.

[0072] In one embodiment, in combination with Figure 1 ,Figure 5 and Figure 8 In the projection along the second direction Y, the conductive member 310 is located between the two first limiting plates 110, and the terminal 320 is located outside the two first limiting plates 110. Based on this, the conductive member 310 and the terminal 320 are separated by the two first limiting plates 110, avoiding the conductive member 310 from being touched by external structures or signal interference. The terminal 320 is not blocked by the first limiting plate 110, and has a large operating space, which is convenient for connecting and operating with external test equipment.

[0073] At this time, the terminal 320 can be located on the side of the test circuit board 200 close to the first limiting plate 110, or can be located on the side of the test circuit board 200 away from the first limiting plate 110, which is not limited here.

[0074] In one embodiment, in combination with Figure 1 and Figure 5 at least one second limiting plate 120 is installed on the top of the first limiting plate 110, and the second limiting plate 120 extends along the first direction X into the limiting space 111. The second limiting plate 120 extends to the top of the limiting space 111, restricting the up and down movement of the filter 10 located in the limiting space 111, that is, ensuring the position stability of the filter 10 in the third direction Z, and at the same time preventing the filter 10 from shifting or shaking during the test, improving the test stability.

[0075] Specifically, second limiting plates 120 are provided on the tops of both first limiting portions, so that the top of the filter 10 is uniformly stressed, enhancing the limiting effect on the filter 10 in the third direction Z.

[0076] In some embodiments, in combination with Figure 5 and Figure 8 the base 100 is provided with a support plate 130 standing upright, and the test circuit board 200 is fixedly installed on the support plate 130. The support plate 130 provides a supporting force for the test circuit board 200, ensuring the test circuit board 200 is stably erected, which is beneficial for the conductive member 310 and the shielding ring 330 protruding from the test circuit board 200 to be respectively in butt contact with the inner conductor 11 and the cavity 12 of the filter 10.

[0077] In one embodiment, in combination with Figure 5 and Figure 8 the support plate 130 is located on one side of the first limiting plate 110 in the second direction Y, that is, the support plate 130 is located on one side of the limiting space 111 in the second direction Y. Thus, the support plate 130 can ensure the position stability of the test circuit board 200, and the limiting space 111 ensures the movement reliability of the filter 10 in the second direction Y, facilitating the filter 10 to accurately position and butt contact with the conductive member 310 and the shielding ring 330 along the second direction Y.

[0078] Specifically, a limiting groove 140 is formed at an interval between the support plate 130 and the first limiting plate 110, and the test circuit board 200 is placed in the limiting groove 140, further improving the position stability of the test circuit board 200.

[0079] In one embodiment, when the test circuit board 200 has a hollow groove 210, the support plate 130 is provided with an avoidance groove 131 corresponding to the shielding ring 330. When the shielding ring 330 and the conductive member 310 undergo deflection deformation along the thickness direction of the test circuit board 200, the avoidance groove 131 can accommodate the shielding ring 330 and the conductive member 310, so that the shielding ring 330 and the conductive member 310 can deflect and deform along with a part of the test circuit board 200 without resistance.

[0080] In one embodiment, the base 100 is provided with a slide rail 150 for supporting the filter 10. The slide rail 150 extends along the second direction Y, so that the filter 10 can stably move along the second direction Y to abut against the test circuit board 200. The setting of the slide rail 150 can reduce the sliding friction of the filter 10 and reduce the wear of the filter 10.

[0081] In some embodiments, combined with Figure 1 and Figure 2 , the test fixture further includes a pressing device 400. The pressing device 400 is installed on the base 100. The pressing device 400 abuts against the filter 10 and presses the filter 10 on the test circuit board 200, further ensuring the position stability of the filter 10 and the test circuit board 200 during the test.

[0082] Optionally, the pressing device 400 is connected with a pressing plate 410. The pressing plate 410 is used to abut against the filter 10, increasing the abutting area, ensuring that the surface of the side of the filter 10 away from the test circuit board 200 is stressed more evenly and the position is more stable. At the same time, it avoids deformation of the small filter 10 due to excessive local stress.

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A filter testing tool, characterized in that: The filter test tool comprises: A base, the base being used to support the filter; A test circuit board is installed on the base, and the test circuit board is provided with a conductive member, a terminal and a shielding ring. The conductive member is used to contact and conduct with the inner conductor of the filter, the terminal is electrically connected to the conductive member, and the shielding ring is arranged around the conductive member at intervals.

2. The filter testing tool according to claim 1, characterized in that: The shielding ring is an elastic ring, a side of the test circuit board close to the filter is a first side surface, and an initial height of the shielding ring protruding from the first side surface is greater than a height of the conductive member protruding from the first side surface.

3. The filter testing tool according to claim 1, characterized in that: The shielding ring is an elastic rubber ring; the elastic rubber ring is arranged on the surface of the test circuit board close to the filter by dispensing glue; And / or, the conductive member has elasticity so that the conductive member is in elastic contact with the inner conductor of the filter.

4. The filter testing tool according to claim 1, characterized in that: The inner diameter of the shielding ring is 1.5 to 3 times the outer diameter of the conductive member.

5. The filter testing tool according to claim 1, characterized in that: The test circuit board is provided with a hollow groove penetrating the test circuit board along the thickness direction of the test circuit board, and the hollow groove is located outside the shielding ring.

6. The filter testing tool according to claim 5, characterized in that: The angle of the hollow groove surrounding the shielding ring is at least 90°.

7. The filter testing tool according to claim 5, characterized in that: The hollow groove includes an arc groove and two straight grooves. The arc groove is arranged around the outer side of the shielding ring, and the two straight grooves are respectively connected to two ends of the arc groove.

8. The filter testing tool according to claim 1, characterized in that: The base is provided with two first limiting plates, and the two first limiting plates are arranged at intervals along a first direction. The interval between the two first limiting plates forms a limiting space for accommodating the filter. The test circuit board is located on one side of the limiting space in a second direction, and the first direction is perpendicular to the second direction.

9. The filter testing tool according to claim 8, characterized in that: In the projection along the second direction, the conductive member is located between the two first limiting plates, and the connection terminal is located outside the two first limiting plates; And / or, a second limiting plate is installed on the top of at least one of the first limiting plates, and the second limiting plate extends into the limiting space along the first direction.

10. The filter testing tool according to any one of claims 1 to 9, characterized in that: The base is provided with a supporting plate, and the testing circuit board is fixedly mounted on the supporting plate.

Images