Radio frequency probe module

Abstract

The utility model relates to the technical field of radio frequency probe modules, and provides a radio frequency probe module, which solves the problem of unstable signal conduction caused by probe jittering and unstable internal contact in the test process, improves the test yield, and comprises a probe body provided with a grounding end and a signal end, and a rigid grounding pin, a sleeve hole is formed in one end, facing the grounding end, of the rigid ground pin, and the grounding end is inserted into the sleeve hole and is in interference fit with the sleeve hole through a conical surface.

Description

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[0005] , , Summary of the Invention

[0001] The utility model relates to the technical field of radio frequency probe modules, and specifically, to a radio frequency probe module. Background Technology

[0002] A flexible printed circuit board, also known as a flexible circuit board or flex board, is a printed circuit made of polyester film or polyimide as the substrate, with circuits formed by etching on copper foil, having high reliability and excellent flexibility. Such a circuit board can be bent and folded arbitrarily, is light in weight, small in size, has good heat dissipation, and is easy to install, breaking through the concept of traditional interconnection technology. Currently, flexible printed circuit boards have been widely used in the fields of aerospace, military, mobile communication, laptop computers, computer peripherals, digital cameras, etc.

[0003] Among them, conventional flex board products include flexible circuit boards mainly composed of radio frequency switches (RF Switches) and matching networks (passive components), and generally also include feeding steel rings (Clips). Such products must be tested before being packaged and shipped to ensure product quality. The conventional test process for its RF radio frequency is as follows: The RF switch chip is made to work in different states by communicating with the RF switch chip through an LK controller. The network analyzer radio frequency signal passes through a coaxial cable, and the probe is inserted into the signal access point of the product. By measuring the scattering parameters and confirming the reasonable threshold through the data of good products, it can be judged whether the RF switch chip, capacitor, inductor, and steel sheet are correctly sampled.

[0004] Since RF testing is sensitive to the stability of metals and the probe and the signal access point on the product (affecting impedance), even if the product performance is qualified, if the signal access is unstable, there is likely to be mismeasurement, which will lead to product scrapping and losses to customers. As customers' requirements for test yield are getting higher and higher, the design of the previous conventional test modules cannot meet the usage requirements and the competitiveness is getting lower. At the same time, the conventional probes used in testing are limited by probe suppliers and currently cannot meet the requirements of small batches, fast delivery periods, and low costs. In addition, the installation method of the probe and the probe mounting sleeve also affects the test yield. Summary of the Invention

[0005] The utility model proposes a radio frequency probe module to solve the problem of unstable signal conduction caused by probe jitter and unstable internal contact during the testing process, and improve the test yield.

[0006] The technical solution of the utility model is as follows:

[0007] A radio frequency probe module includes a probe body with a ground terminal and a signal terminal. The probe body includes a rigid ground pin with a sleeve hole at one end facing the ground terminal. The ground terminal is inserted into the sleeve hole and is press-fitted with the sleeve hole by a tapered surface.

[0008] Furthermore, the sleeve includes a tapered section that is interference-fitted with the outer wall of the grounding end, and the diameter of the tapered section gradually increases from the side closer to the grounding end to the side farther away from the grounding end.

[0009] Furthermore, it includes a straight hole section and an enlarged hole section, wherein the straight hole section, the enlarged hole section, and the tapered hole section are arranged sequentially from the outside to the inside;

[0010] The diameter of the enlarged hole section is larger than that of the straight hole section, and the diameter of the tapered hole section on the side near the grounding end is the same as that of the enlarged hole section.

[0011] Furthermore, it includes a signal pin, a proximal guide plate, and a floating spring. The rigid ground pin passes through the proximal guide plate and is connected to the grounding end, while the signal pin passes through the proximal guide plate and is connected to the signal end.

[0012] The floating spring is connected to the side of the probe body facing away from the proximal guide plate.

[0013] Furthermore, a floating limit guide block is provided at the end of the floating spring away from the probe body for adjusting the floating force of the floating spring and guiding the floating of the probe body.

[0014] Furthermore, the probe body is provided with a floating platform on the side facing away from the proximal guide plate, and one end of the floating spring is connected to the side of the floating platform facing away from the proximal guide plate.

[0015] The floating guide block has a limiting groove for accommodating the floating spring, and the other end of the floating spring is located in the limiting groove and connected to the inner wall of the limiting groove.

[0016] Furthermore, a carrier plate is provided between the floating platform and the near-end guide plate, and the carrier plate has a positioning groove for the floating limiting guide block to be embedded in one end toward the near-end guide plate.

[0017] Furthermore, a positioning pin is provided between the carrier plate and the proximal guide plate.

[0018] Furthermore, the outer wall of the rigid ground needle is provided with a first reinforcing section, a guide section, a second reinforcing section and a limiting step section in sequence from the puncture point to the direction away from the probe body. The first reinforcing section and the second reinforcing section are both frustum-shaped structures, and the guide section and the limiting step section are both cylindrical structures. The diameter of the limiting step section is larger than the diameter of the guide section.

[0019] The beneficial effects of this utility model are as follows:

[0020] Conventional probes are elastic components with internal springs. During signal switching, the compressibility and rotatability of the springs cause changes in the RCL loop impedance, affecting test stability and impacting RF testing of some special products. This invention solves the problem of unstable signal conduction caused by probe jitter and unstable internal contact during testing by changing the rigid ground pin and ground terminal from the existing interlocking mounting to a tapered, top-to-top interlocking mounting, thereby improving test yield. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is an assembly diagram of the present invention;

[0023] Figure 2 For the explosion of this utility model Figure 1 ;

[0024] Figure 3 For the explosion of this utility model Figure 2 ;

[0025] Figure 4 For the explosion of this utility model Figure 3 ;

[0026] Figure 5 This is a partial cross-sectional view of a rigid ground pin;

[0027] Figure 6 The waveform diagram of scattering parameters in the existing technology (RF test data);

[0028] Figure 7 The waveform diagram of the scattering parameters of this utility model (RF test data);

[0029] Figure 8 This is a three-dimensional diagram of a rigid ground pin.

[0030] In the diagram: 1. Probe body; 11. Grounding terminal; 12. Signal terminal; 13. Floating stage; 14. Positioning groove; 2. Rigid ground pin; 21. Straight hole section; 22. Expanded hole section; 23. Tapered hole section; 24. First reinforcement section; 25. Guide section; 26. Second reinforcement section; 27. Limiting step section; 3. Signal pin; 4. Proximal guide plate; 5. Floating spring; 6. Floating limiting guide block; 61. Limiting groove; 7. Positioning pin. Detailed Implementation

[0031] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0032] Example 1

[0033] like Figure 1-5 As shown, an RF probe module includes a probe body 1 (in this embodiment, an Ingon probe). The probe body 1 has a copper block portion, a ground terminal 11, a signal terminal 12, a related carrier board, and a connector for connecting to the control system. The ground terminal 11 and the signal terminal 12 are used for grounding and signal acquisition and transmission during testing, respectively. In the prior art, conventional probes are assembled by interference fit with a dowel pin. As the number of insertions and removals increases, the dowel pin causes the diameter of the dowel pin to expand outward, and the spring probe and the dowel pin become increasingly loose. Furthermore, during testing, the spring probe will swing at the non-interference fit end, causing impedance instability and high-frequency dropouts. The test curve is shown in Figure 1. Figure 6 As shown. Therefore, this embodiment makes improvements by redesigning the rigid grounding pin 2 (or non-elastic grounding pin). The rigid grounding pin 2 has a sleeve hole at one end facing the grounding end 11. The grounding end 11 is inserted into the sleeve hole using a tool, and the rigid grounding pin 2 rests against the outer end of the grounding end 11. The grounding end 11 and the sleeve hole are connected by a tapered interference fit to ensure reliable connection. Under high vibration or impact environments, the interference fit remains stable and prevents loosening. Furthermore, since the rigid grounding pin 2 is mostly made of copper and is a consumable, the design of this embodiment can extend its service life. After repeated insertion and removal, the sleeve hole is less likely to enlarge, extending the wear cycle.

[0034] Specifically, in this embodiment, a tapered hole section 23 is provided inside the sleeve hole, which is interference-fitted with the outer wall of the grounding end 11. The diameter of the tapered hole section 23 gradually increases from the side closer to the grounding end 11 to the side farther away from the grounding end 11. This ensures that when the grounding end 11 is inserted, the outer surface of the grounding end 11 abuts against the wall of the tapered hole section 23, and the grounding end 11 is clamped as the tooling continuously taps it in, thereby preventing vibration between the rigid grounding pin 2 and the grounding end 11.

[0035] Meanwhile, the bushing in this embodiment also includes a straight hole section 21 and an enlarged hole section 22, which are sequentially arranged from the outside to the inside. The diameter of the enlarged hole section 22 is larger than that of the straight hole section 21, and the diameter of the conical hole section 23 near the grounding end 11 is the same as that of the enlarged hole section 22. This design allows the straight hole section 21 to assist in positioning and guiding the grounding end 11, while the enlarged hole section 22 facilitates the smooth introduction of the grounding end 11 into the conical hole section 23, making assembly more efficient, convenient, and reliable.

[0036] Furthermore, the outer wall of the rigid pin 2, from the insertion point to the direction away from the probe body 1, is sequentially provided with a first reinforcing section 24, a guide section 25, a second reinforcing section 26, and a limiting step section 27. The first reinforcing section 24 and the second reinforcing section 26 are both frustum-shaped structures, while the guide section 25 and the limiting step section 27 are both cylindrical structures, with the diameter of the limiting step section 27 being larger than the diameter of the guide section 25. The design of the first reinforcing section 24 and the second reinforcing section 26 improves the structural strength of the rigid pin 2, the guide section 25 is used to cooperate with the equipment guide plate to improve the accuracy during insertion, and the limiting step section 27 cooperates with the proximal guide plate 4 to control the maximum compression stroke of the rigid pin 2. Simultaneously, the outer walls of the rigid pin 2 in the straight hole section 21, the enlarged hole section 22, and the tapered hole section 23 can also serve as guide surfaces, abutting against the inner wall of the perforation of the proximal guide plate 4, the inner wall of the perforation of the copper block portion of the probe body 1, or the inner wall of the perforation of other mold carrier plates.

[0037] This embodiment utilizes the clamping and fixing method of the tapered hole section 23 and the straight hole section 21 to automatically align the grounding end 11 during assembly, ensuring the coaxiality of the grounding end 11 and the sleeve hole and reducing eccentricity errors. The interference fit generates significant friction, effectively resisting axial and circumferential loads and preventing loosening. The tapered contact surface ensures more uniform stress distribution, reducing local stress concentration and extending the life of the parts. Although the clamping force is strong, disassembly can be achieved using axial force, facilitating maintenance and replacement.

[0038] At the same time, such as Figure 8 As shown, in order to reduce the interference of the outer wall of the rigid pin 2 during assembly and to facilitate assembly and use, this embodiment can also cut two planes on the opposite sides of the outer walls of the straight hole section 21, the enlarged hole section 22 and the tapered hole section 23.

[0039] Example 2

[0040] like Figure 1-7 As shown, based on Embodiment 1, this embodiment adds a signal needle 3, a proximal guide plate 4, and a floating spring 5. The rigid ground needle 2 passes through the proximal guide plate 4 and is electrically connected to the grounding terminal 11. The signal needle 3 passes through the proximal guide plate 4 and is installed opposite to the signal terminal 12, responsible for transmitting the collected signal to the signal terminal 12.

[0041] The copper block of probe body 1 can pass through the proximal guide plate 4 and maintain a linkage with it. The proximal guide plate 4 cooperates with the rigid ground pin 2 and signal pin 3, and constrains the radial degrees of freedom of the rigid ground pin 2 and signal pin 3. This adds guidance at a relatively close distance to the test point, solving the problem of excessive impedance change caused by the probe misaligning at the test point. It also prevents the copper block on probe body 1 from tilting at a small angle, causing the pin insertion position to deviate from the test position, thus improving the stability of the rigid ground pin 2 and signal pin 3.

[0042] One end of the floating spring 5 is connected to the side of the probe body 1 facing away from the proximal guide plate 4, which serves to provide the probe body 1 with elastic floating function.

[0043] Meanwhile, in this embodiment, a floating limit guide block 6 is provided at the end of the floating spring 5 away from the probe body 1 to adjust the floating force of the floating spring 5 and guide the floating of the probe body 1, thereby realizing the adjustment of the floating force of the floating spring 5. This embodiment preferably adopts a design of two sets of floating springs 5 ​​plus floating limit guide blocks 6 to improve the stability and floating balance of the module. The floating limit guide block 6 is also provided with locking holes for precise positioning and locking to the upper mold (screw).

[0044] Specifically, the floating limit guide block 6 has a limiting groove 61 for accommodating the floating spring 5. The other end of the floating spring 5 is located inside the limiting groove 61 and connected to the inner wall of the limiting groove 61. The inner wall of the limiting groove 61 can limit the floating spring 5, so that when the floating spring 5 is compressed, each helical segment maintains coaxiality. One end of the floating spring 5 is connected to the side of the floating platform 13 facing away from the near-end guide plate 4.

[0045] Furthermore, in this embodiment, a floating platform 13 is provided on the side of the probe body 1 facing away from the proximal guide plate 4. This platform guides the probe body 1 during floating and facilitates the replacement of floating springs 5 ​​of different specifications, allowing adjustment of the compression and floating stroke of the probe body 1. Specifically, there is a 0.1mm gap between the inner wall of the floating limiting guide block 6 and the side of the floating platform 13. Simultaneously, a carrier plate is provided between the floating platform 13 and the proximal guide plate 4, and the carrier plate is fixed relative to the proximal guide plate 4. In this embodiment, a positioning groove 14 is provided on the carrier plate for the floating limiting guide block 6 to embed when displacing relative to the probe body 1. The embedding position is at the end of the floating limiting guide block 6 facing the proximal guide plate 4. This improves the reliability of the floating limiting guide block 6 when engaging with the probe body 1, and through the engagement of the floating limiting guide block 6 with the floating platform 13, prevents the floating limiting guide block 6 from lateral displacement during floating. The depth of the positioning groove 14 also serves as a limit, controlling the maximum compression of the floating spring 5 to a certain extent, thereby adjusting the floating range.

[0046] In addition, in this embodiment, positioning pins 7 can be provided between the proximal guide plate 4 and the module carrier plate, and between the carrier plate and other structures of the module, for positioning and to keep the structure of both stable.

[0047] The above design, through the cooperation of the floating spring 5 and the floating limit guide block 6, enables the inelastic rigid ground pin 2 and signal pin 3 to have a buffering function, and controls the stress of the probe body 1 on the product, avoiding the phenomenon of product damage during testing. It can also make the floating design work on non-circuit devices, solving the problems of probe structure circuit impedance variation and difficulty in adjusting the floating spring force in the prior art.

[0048] This embodiment is generally used for testing the upper mold of the fixture. The working mode is as follows: In the initial state, the probe body 1 is pressed onto the mounting plate, the test fixture is closed, each non-elastic probe on the module contacts the product test point, the entire module is lifted for buffering, the lower computer receives the mold closing signal, and the test is started.

[0049] In summary, this embodiment achieves a high test yield, exceeding 99.9%. Furthermore, it allows for the creation of custom-made non-elastic probes, facilitating design and adjustments. Simultaneously, it reduces the impact of the internal springs of conventional probes on the test.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A radio frequency probe module, comprising a probe body (1), the probe body (1) having a ground terminal (11) and a signal terminal (12), characterized in that, It includes a rigid grounding pin (2), which has a sleeve hole at one end facing the grounding end (11). The grounding end (11) is inserted into the sleeve hole and is press-fitted with the sleeve hole through a conical surface.

2. The radio frequency probe module as described in claim 1, characterized in that, The sleeve includes a tapered hole section (23) that is interference-fitted with the outer wall of the grounding end (11). The diameter of the tapered hole section (23) gradually increases from the side closer to the grounding end (11) to the side farther away from the grounding end (11).

3. The radio frequency probe module as described in claim 2, characterized in that, It includes a straight hole section (21) and an enlarged hole section (22), wherein the straight hole section (21), the enlarged hole section (22) and the tapered hole section (23) are arranged sequentially from the outside to the inside; The diameter of the enlarged hole section (22) is larger than that of the straight hole section (21), and the diameter of the tapered hole section (23) on the side near the grounding end (11) is the same as that of the enlarged hole section (22).

4. The radio frequency probe module as described in claim 1, 2, or 3, characterized in that, Includes a signal needle (3), a proximal guide plate (4) and a floating spring (5). The rigid ground needle (2) passes through the proximal guide plate (4) and is connected to the grounding end (11). The signal needle (3) passes through the proximal guide plate (4) and is connected to the signal end (12). The floating spring (5) is connected to the probe body (1) on the side facing away from the proximal guide plate (4).

5. The radio frequency probe module as described in claim 4, characterized in that, The floating spring (5) is provided with a floating limit guide block (6) at the end away from the probe body (1) for adjusting the floating force of the floating spring (5) and guiding the floating of the probe body (1).

6. The radio frequency probe module as described in claim 5, characterized in that, The probe body (1) has a floating platform (13) on the side facing away from the proximal guide plate (4), and one end of the floating spring (5) is connected to the side of the floating platform (13) facing away from the proximal guide plate (4). The floating limit guide block (6) has a limit groove (61) for accommodating the floating spring (5). The other end of the floating spring (5) is located in the limit groove (61) and connected to the inner wall of the limit groove (61).

7. The radio frequency probe module as described in claim 6, characterized in that, A carrier plate is provided between the floating platform (13) and the near-end guide plate (4), and the carrier plate has a positioning groove (14) for the floating limiting guide block (6) to be embedded in the near-end guide plate (4).

8. The radio frequency probe module as described in claim 7, characterized in that, A positioning pin (7) is provided between the carrier plate and the proximal guide plate (4).

9. The radio frequency probe module as described in claim 1, 2, or 3, characterized in that, The outer wall of the rigid ground needle (2) is provided with a first reinforcing section (24), a guide section (25), a second reinforcing section (26) and a limiting step section (27) in sequence from the needle insertion point to the direction away from the probe body (1). The first reinforcing section (24) and the second reinforcing section (26) are both frustum-shaped structures, and the guide section (25) and the limiting step section (27) are both cylindrical structures. The diameter of the limiting step section (27) is larger than the diameter of the guide section (25).

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