High-density, high-isolation and easy-to-disassemble radio frequency spring needle assembly

Abstract

The utility model relates to the technical field of microwaves, and discloses a high-density, high-isolation and easy-to-disassemble radio frequency spring needle assembly, which comprises a plurality of radio frequency spring needles, a plurality of grounding spring needles, a filling medium and a metal shell. Wherein the single radio frequency spring needle is fixed in the filling medium, the plurality of grounding spring needles are placed around the filling medium and fixed in the metal shell, and the grounding spring needles are in close contact with the metal shell to form electrical connection; the single radio frequency spring needle, the grounding spring needles around the single radio frequency spring needle, the filling medium and the metal shell jointly form a group of coaxial structures, every two adjacent groups of coaxial structures share one or two grounding spring needles, and all the coaxial structures share the metal shell. The utility model is mainly used for interconnection transmission of radio frequency signals, and has the advantages of high density, miniaturization, high isolation, easy disassembly, high reliability and the like.

Description

Technical Field

[0001] This utility model belongs to the field of microwave technology and discloses a high-density, high-isolation, and easily detachable radio frequency spring pin assembly. Background Technology

[0002] In recent years, as active phased arrays have developed towards miniaturization, lightweighting, and high integration, the demand for miniaturization and high density of their internal interconnection design has also increased. Contact blind mating connectors, with their advantages of low profile, high density, and small size, provide a new approach for the three-dimensional integrated design of active phased arrays.

[0003] Contact-type blind mating connectors mainly include spring pin connectors and button connectors. Button connectors have a small axial blind mating float and are suitable for interconnecting boards with lower profiles and smaller units. Spring pin connectors have a large axial blind mating float and are more suitable for applications with large board spacing and multi-point blind mating.

[0004] Currently, spring pin connectors are more commonly used for power and control signal transmission, and less so for radio frequency (RF) signal transmission. Existing RF transmission solutions typically mount individual spring pins directly into a metal frame, using the metal frame as the RF ground. During use, the circuit board needs to be in close contact with the metal frame to ensure good grounding. However, in large-area inter-board interconnection scenarios, warping and unevenness can occur during the fabrication of both the printed circuit board (PCB) and the metal frame, with PCB warping being more pronounced. Ensuring good grounding during assembly is often difficult. Excessive force applied to the PCB, while ensuring grounding, can also cause PCB deformation, damage to metal pads, and damage to the spring pin tips due to excessive or uneven force. Conversely, insufficient force can lead to poor RF grounding, crosstalk between adjacent signals, and inadequate electromagnetic shielding. Furthermore, direct mounting of individual spring pins presents challenges. Due to the small size of each spring pin, the machining of the limiting holes on the metal frame is difficult. Holes that are too large may cause the spring pin tip to bend and be damaged due to non-perpendicular force during clamping. Holes that are too small result in difficult assembly, poor operability, and poor maintainability. Utility Model Content

[0005] To address potential problems in current spring pin connector applications, this invention proposes a high-density, high-isolation, and easily disassembled radio frequency spring pin assembly. It can be used for high-density radio frequency signal interconnection and transmission between boards, offering advantages such as miniaturization, high isolation, easy disassembly, and high reliability.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-density, high-isolation, and easily detachable radio frequency spring pin assembly includes a radio frequency spring pin, a grounding spring pin, a filling medium, and a metal housing; a single radio frequency spring pin is fixed inside the filling medium, and multiple grounding spring pins are placed around the filling medium and fixed in the metal housing, with the grounding spring pins in close contact with the metal housing to form an electrical connection.

[0008] Furthermore, a single RF spring pin and its surrounding grounding spring pin, filling medium, and metal casing together form a coaxial structure, with each pair of adjacent coaxial structures sharing one or two grounding spring pins.

[0009] Furthermore, the coaxial structure shares a common metal casing.

[0010] Furthermore, both the radio frequency spring needle and the grounding spring needle include a needle head, a spring, and a needle housing, wherein the needle head is located inside the needle housing and the two are slidably engaged; the spring is located inside the needle housing, and the inner end of the needle head abuts against the spring.

[0011] Furthermore, the needle housing contains two needles, which are located at both ends of the needle housing and slide in cooperation with the needle housing. The two ends of the spring abut against the inner ends of the two needles respectively.

[0012] Furthermore, the inner end of the needle is provided with a large portion, and the end of the needle shell is a converging portion, with the large portion located inside the converging portion.

[0013] Furthermore, the central axes of the needle, spring, and needle housing coincide.

[0014] Furthermore, the filling medium is an insulating material.

[0015] Furthermore, the metal shell is a two-part structure, with the two parts fixed by welding or gluing.

[0016] Furthermore, the metal outer shell is provided with a through hole for matching the needle shell; the through hole is a constricted structure, the needle tip protrudes from the constricted section, and the needle shell is located inside the constricted section.

[0017] The present invention has the following advantages:

[0018] (1) The spring pins are assembled in the form of components, which reduces the assembly difficulty, reduces the probability of damage to the spring pins, and improves the processing and production efficiency compared to a single spring pin.

[0019] (2) In use, the structural components and the radio frequency spring pin assembly are in a limited assembly method. Compared with welding, bonding and other assembly methods, the components are easy to disassemble and replace, which can significantly improve the maintainability of the system.

[0020] (3) The RF spring pin assembly uses RF spring pins and grounding spring pins together, which helps to improve the poor RF grounding caused by the warping of the printed circuit board when using large-area inter-board lamination, improve electromagnetic shielding, and reduce signal crosstalk.

[0021] (4) The design of two adjacent coaxial structures sharing a grounding spring pin in the RF spring pin assembly helps to achieve high-density transmission of RF signals and further enhances the miniaturization of the system.

[0022] (5) The metal shell of the RF spring pin assembly adopts a two-section split structure to fix the grounding spring pin in the metal shell. Compared with directly gluing the spring pin into the limiting hole, this structure is more stable, the spring pin is not easy to fall out, and the reliability of the RF spring pin assembly is improved. Attached Figure Description

[0023] Figure 1 This is a 3D structural diagram of the radio frequency spring pin assembly.

[0024] Figure 2 These are front and top views of the RF spring pin assembly.

[0025] Figure 3 This is a schematic diagram of the structure of the radio frequency spring pin and the grounding spring pin.

[0026] Figure 4 This is a schematic diagram of the two-section structure of the metal casing of the radio frequency spring pin assembly.

[0027] Figure 5 This is an application example of an RF spring pin assembly. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments and accompanying drawings:

[0029] A high-density, high-isolation, and easily detachable radio frequency spring pin assembly includes multiple radio frequency spring pins 1, multiple grounding spring pins 2, a filling medium 3, and a metal housing 4. Each radio frequency spring pin 1 is installed and fixed inside the filling medium 3, and several grounding spring pins 2 are placed around the filling medium 3 and installed and fixed in the metal housing 4. The grounding spring pins 2 are in close contact with the metal housing 4 to form an electrical connection.

[0030] The number of radio frequency spring pins 1 is greater than or equal to 2; the individual radio frequency spring pin 1 and the surrounding grounding spring pins 2, filling medium 3, and metal shell 4 form a coaxial structure; the number of grounding spring pins 2 around the individual radio frequency spring pin 1 is greater than or equal to 8; each two adjacent coaxial structures share one or two grounding spring pins 2; all coaxial structures share the metal shell 4.

[0031] The diameter of the radio frequency spring pin is determined based on the operating frequency.

[0032] The radio frequency spring pin and the grounding spring pin include a needle tip, a spring, and a needle housing.

[0033] The filling medium uses an insulating material.

[0034] The metal shell is a two-part structure, with structure one and structure two fixed by welding or gluing.

[0035] The specific usage of this RF spring pin assembly is as follows: The RF spring pin assembly is assembled in a structural frame, with circuit boards at both ends of the spring pin assembly. The circuit boards at both ends of the RF spring pin assembly are pressed tightly into the structural frame, compressing the spring pin and ensuring close contact between the pin tip and the metal pads on the circuit board, thus completing the interconnection. To ensure the positional accuracy of the RF spring pin assembly, the size of the limiting hole is consistent with the size of the metal shell of the spring pin assembly. During processing, the size of the limiting hole is set to a positive tolerance, and the size of the metal shell is set to a negative tolerance.

[0036] like Figure 1 As shown, in this embodiment, the RF spring pin has 4 cores, and the grounding spring pins around a single RF spring pin have 10 cores. The RF spring pins are arranged in a grid pattern, and the height of the RF spring pin assembly is 8mm.

[0037] In some possible embodiments, the number of RF spring pins is determined based on the RF layout space on the circuit board and the number of RF signals transmitted. The RF spring pin layout includes, but is not limited to, a grid pattern, a straight line pattern, and a diamond staggered pattern.

[0038] In this embodiment, the diameter of the RF spring pin is 0.3 mm, and the distance between the RF spring pin and the ground spring pin is 1.5 mm. In some possible embodiments, since spring pins of different diameters are applicable to different operating frequencies, and according to the coaxial structure impedance matching formula, the distance between the RF spring pins of different diameters and the ground spring pins is different. The diameter of the RF spring pin in the spring pin assembly is determined according to the operating frequency and the allowable spatial range for arrangement.

[0039] like Figure 1 As shown, the filling medium uses insulating material, which is polytetrafluoroethylene. The metal casing is made of brass and plated with gold.

[0040] like Figure 2 As shown, the elastic compression of the RF spring pin and the grounding spring pin is 0.5mm.

[0041] like Figure 3 As shown, the radio frequency spring needle and the grounding spring needle include a needle head 101, a spring 102, and a needle housing 103. There are two needle heads inside the needle housing, located at both ends of the needle housing and slidingly engaged with the needle housing. The two ends of the spring abut against the inner ends of the two needle heads. The inner end of the needle head has a large portion, and the end of the needle housing is a converging portion, with the large portion located inside the converging portion.

[0042] like Figure 4 As shown, the metal shell is a two-part split structure, with split structure one 41 and split structure two 42 fixed by welding or gluing.

[0043] like Figure 5 As shown, the specific usage of this RF spring pin assembly is as follows: The RF spring pin assembly 11 is assembled in the structural frame 22. Both ends of the spring pin assembly 11 are circuit boards 33. The circuit boards 33 at both ends of the spring pin assembly 11 are pressed tightly into the structural frame 22, compressing the spring pin and ensuring close contact between the pin tip and the metal pads on the circuit board, thus completing the interconnection. To ensure the positional accuracy of the RF spring pin assembly, the size of the limiting hole is consistent with the size of the metal shell of the spring pin assembly. During processing, the size of the limiting hole is set to a positive tolerance, and the size of the metal shell is set to a negative tolerance.

[0044] exist Figure 5 In the application example shown, the board interconnect height is 8mm, therefore the RF spring pin assembly height is 8mm (excluding the spring pin tip with compression).

[0045] exist Figure 5 In the application example shown, the circuit board 33 has metal pads. When pressed, the spring pin tip is in close contact with the metal pads. The size of the metal pads is determined based on the diameter of the RF spring pin, the relative error between the circuit board 33 and the structural frame 22, and the limiting error between the structural frame 22 and the RF spring pin assembly 11.

Claims

1. A high-density, high-isolation, and easily detachable radio frequency spring pin assembly, characterized in that, It includes an RF spring pin, a grounding spring pin, a filling medium, and a metal housing; a single RF spring pin is fixed inside the filling medium, and multiple grounding spring pins are placed around the filling medium and fixed in the metal housing, with the grounding spring pins in close contact with the metal housing to form an electrical connection.

2. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 1, characterized in that, A single RF spring pin and its surrounding grounding spring pin, filling medium, and metal casing together form a coaxial structure. Each pair of adjacent coaxial structures shares one or two grounding spring pins.

3. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 2, characterized in that, The coaxial structure shares a common metal casing.

4. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 1, characterized in that, Both the radio frequency spring needle and the grounding spring needle include a needle head, a spring, and a needle housing, wherein the needle head is located inside the needle housing and the two are slidably engaged; the spring is located inside the needle housing, and the inner end of the needle head abuts against the spring.

5. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 4, characterized in that, The needle housing contains two needles, located at both ends of the needle housing and slidingly engaged with it. The two ends of the spring rest against the inner ends of the two needles.

6. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 4, characterized in that, The needle tip has a large portion at its inner end and a converging portion at the end of the needle shell, with the large portion located inside the converging portion.

7. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 4, characterized in that, The central axes of the needle, spring, and needle housing coincide.

8. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 1, characterized in that, The filling medium is an insulating material.

9. The high-density, high-isolation, and easily detachable radio frequency spring pin assembly according to claim 1, characterized in that, The metal shell is a two-part structure, and the two parts are fixed by welding or gluing.

10. A high-density, high-isolation, easily detachable radio frequency spring pin assembly according to claim 4, characterized in that, The metal outer shell has a through hole for matching the needle shell; the through hole has a constricted structure, the needle protrudes from the constricted section, and the needle shell is located inside the constricted section.

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