An SSMA type adapter suitable for 70GHz high-frequency signal transmission

Abstract

This utility model discloses an SSMA-type adapter suitable for 70GHz high-frequency signal transmission, comprising an outer conductor, an inner conductor, and an insulating sleeve. The outer conductor consists of a first outer conductor and a second outer conductor arranged coaxially, connected by a central outer shell thread. An axial mounting through-hole is formed inside the outer conductor, and the inner conductor is disposed within this hole, coaxially arranged with the outer conductor. An annular groove is formed in the middle of the inner conductor, within which an insulating sleeve and a metal bushing are sequentially fitted. The SSMA-type adapter designed in this utility model has a compact structure with small tolerances, can operate at frequencies up to 70GHz, exhibits low insertion loss, and reduces signal loss compared to traditional adapters. It also demonstrates good connection stability under vibration conditions and meets the needs of emerging fields such as 5G communication and satellite communication for 70GHz high-frequency signal transmission.

Description

Technical Field

[0001] This utility model relates to an adapter, specifically an SSMA type adapter suitable for 70GHz high-frequency signal transmission. Background Technology

[0002] Currently, while traditional SSMA adapters can meet the transmission requirements of conventional radio frequency signals to a certain extent, their frequency limit is usually around 40GHz. When facing the demand for 70GHz high-frequency signal transmission in emerging fields such as 5G communication and satellite communication, the performance of existing conventional SSMA adapters in terms of signal loss and VSWR is insufficient, making it difficult to meet the requirements of high frequency and high performance.

[0003] Existing SSMA adapters generally use polytetrafluoroethylene (PTFE) as the insulating medium, with ordinary copper alloys for the inner / outer conductors. While their structural design meets requirements below 40GHz, they exhibit significant drawbacks in the 70GHz high-frequency range. These drawbacks include: the low dielectric constant of traditional PTFE material leading to significantly increased dielectric loss at high frequencies; large structural tolerances (typically >10μm), resulting in signal reflection and scattering; low electromagnetic shielding effectiveness of the outer shell, making it susceptible to interference in complex environments; and the tendency for the conventional structure to loosen in high-vibration environments, affecting connection reliability. Therefore, there is an urgent need for an SSMA adapter suitable for 70GHz high-frequency signal transmission to address these issues.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0005] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide an SSMA type adapter suitable for 70GHz high-frequency signal transmission.

[0006] To achieve the above and other related objectives, the technical solution provided by this utility model is: an SSMA type adapter suitable for 70GHz high-frequency signal transmission, comprising an outer conductor, an inner conductor, and an insulating sleeve. The outer conductor consists of a first outer conductor and a second outer conductor arranged coaxially, which are connected by a central outer shell thread. An axial mounting through-hole is formed inside the outer conductor, and the inner conductor is disposed within the mounting through-hole, coaxially arranged with the outer conductor. An annular groove is formed in the middle of the inner conductor, and an insulating sleeve and a metal bushing are sequentially fitted within the annular groove. This solution adopts a novel compact structural design, optimizes the layout of the internal components of the adapter, and reduces interference and loss in the signal transmission path.

[0007] Furthermore, both the first and second outer conductors have a first external thread on their inner ends; the inner side of the outer casing has an internal thread that matches the first external thread. In this design, the thread fit accuracy reaches 6H / 6g level, the engagement length is ≥3 times the pitch, assembly gaps are eliminated, and 70GHz signal reflection is suppressed.

[0008] Furthermore, stepped grooves are formed on both sides of the annular groove, and the first and second retaining rings are respectively embedded in the two stepped grooves, with an axial gap of ≤0.005mm between them and the insulating sleeve. In this design, a mechanically locking insulating sleeve is used, which can resist axial impact force and prevent high-frequency vibration from causing displacement of the insulating sleeve.

[0009] Furthermore, both ends of the inner conductor are radially elastic expansion sleeve structures. In this design, the elastic design can automatically adapt to the minute manufacturing tolerances of the pin diameter. During repeated insertion and removal, it can compensate for slight wear on its own and the pin contact surface, maintaining stable contact pressure. The expansion sleeve structure ensures the stability of high-frequency contact.

[0010] Furthermore, the expansion sleeve structure consists of 4 to 12 elastic claw plates, with a thickness t = 0.15 ± 0.01 mm. In this design, as an extension of the inner conductor, multiple elastic claw plates can tightly wrap around the outer surface of the pin (male connector). During insertion, the claw plates undergo elastic deformation, generating radial contact force to ensure a low-resistance, high-reliability electrical path with the pin surface, guaranteeing efficient signal transmission.

[0011] Furthermore, the inner conductor is made of beryllium bronze with a surface roughness Ra ≤ 0.1 μm. In this solution, the material of the inner conductor includes, but is not limited to, beryllium bronze. Using a high-conductivity metal material as a conductor can improve signal transmission efficiency and reduce resistance loss.

[0012] Furthermore, the dielectric constant of the insulating sleeve is ≥3, and the insulating sleeve is made of PEI material. In this solution, the material of the insulating sleeve includes, but is not limited to, PEI. Selecting a novel material with low loss and high dielectric constant as the insulating medium of the adapter can effectively reduce energy loss of the signal during transmission.

[0013] Furthermore, both the first and second outer conductors are provided with a second external thread at their outer ends. In this design, the thread pitch diameter tolerance is ≤4μm, and the thread angle is 55°±0.1°, ensuring compatibility with standard SSMA interfaces.

[0014] Furthermore, the inner wall of the insulating sleeve is interference-fitted with the inner conductor, and the interference amount is 0.005~0.01mm. In this design, the interference fit can eliminate air gaps and reduce interface reflection.

[0015] Furthermore, the outer wall of the outer casing is provided with heat dissipation grooves, with a groove depth h = 0.8~1.2mm, a groove width w = 1.0~1.2mm, and a groove spacing p = 2.5~3.5mm. This design ensures effective heat dissipation, reduces temperature rise, and prevents high-frequency thermal mismatch.

[0016] Due to the application of the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0017] 1. The SSMA type adapter of this utility model can achieve low-loss and low-VSWR signal transmission at a high frequency of 70G. The signal loss is reduced compared with existing adapters, the VSWR is reduced, and the signal transmission quality and stability are effectively improved.

[0018] 2. This utility model can be widely applied in fields with stringent requirements for high-frequency signal transmission, such as 5G communication base stations, satellite communication ground stations, radar systems, and high-speed data transmission equipment, thereby promoting the development and application of related technologies.

[0019] 3. By optimizing the structural design and using high-performance materials, this utility model improves the mechanical strength and environmental adaptability of the adapter, enabling it to work stably and reliably in harsh working environments and extending the service life of the equipment. Attached Figure Description

[0020] Figure 1 This is a half-sectional view of the adapter structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the external structure of the adapter of this utility model;

[0022] Figure 3 This is a schematic diagram of the full cross-sectional structure of the adapter of this utility model;

[0023] In the above attached figures,

[0024] 11. First outer conductor; 12. Second outer conductor; 13. Mounting through hole; 111, 121. First external thread; 112, 122. Second external thread;

[0025] 2. Inner conductor; 21. Annular groove; 22. Stepped groove; 23. Expansion sleeve structure;

[0026] 3. Insulating sleeve; 4. Outer shell; 5. Metal bushing; 61. First retaining ring; 62. Second retaining ring. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0032] Example:

[0033] This embodiment provides an SSMA type adapter suitable for 70GHz high-frequency signal transmission. See attached document. Figure 1 and attached Figure 3As shown, the device includes an outer conductor, an inner conductor 2, and an insulating sleeve 3. The outer conductor consists of a first outer conductor 11 and a second outer conductor 12, which are coaxially arranged and connected by a threaded outer shell 4 in the middle. An axial mounting through-hole 13 is provided inside the outer conductor, and the inner conductor 2 is disposed within the mounting through-hole 13, coaxially arranged with the outer conductor. The coaxiality of the inner conductor 2 and the outer conductor is ≤5μm, reducing signal reflection and improving the standing wave ratio. The split outer conductor structure reduces manufacturing difficulty. The outer shell 4 is made of materials including, but not limited to, stainless steel, providing mechanical protection and enhancing shielding, reducing electromagnetic interference and ensuring stable operation in complex electromagnetic environments. An annular groove 21 is provided in the middle of the inner conductor 2, within which an insulating sleeve 3 and a metal bushing 5 are sequentially fitted.

[0034] See appendix Figure 1 and attached Figure 3 As shown, the inner ends of the first outer conductor 11 and the second outer conductor 12 are both provided with first external threads 111 and 121; the inner side of the outer casing 4 is provided with an internal thread that matches the first external threads 111 and 121. The thread fit accuracy reaches 6H / 6g level, and the engagement length is ≥3 times the pitch. This eliminates assembly gaps and suppresses 70GHz signal reflection.

[0035] See appendix Figure 1 and attached Figure 3 As shown, stepped grooves 22 are provided on both sides of the annular groove 21. The first retaining ring 61 and the second retaining ring 62 are respectively embedded in the two stepped grooves 22, and the axial gap between them and the insulating sleeve 3 is ≤0.005mm. The mechanical locking of the insulating sleeve 3 can resist axial impact force and prevent displacement of the insulating sleeve 3 caused by high-frequency vibration. The first retaining ring 61 and the second retaining ring 62 are made of insulating material.

[0036] See appendix Figure 1 and attached Figure 3 As shown, both ends of the inner conductor 2 are radially elastic expansion sleeve structures 23. The elastic design automatically adapts to minute manufacturing tolerances in the pin diameter. During repeated insertion and removal, it compensates for slight wear on its own and the pin's contact surface, maintaining stable contact pressure. The expansion sleeve structure 23 ensures the stability of high-frequency contact. The expansion sleeve structure 23 consists of 4 to 12 elastic claw pieces, with a claw thickness t = 0.15 ± 0.01 mm. As an extension of the inner conductor 2, multiple elastic claw pieces tightly wrap around the outer surface of the pin (male connector). During insertion, the claw pieces undergo elastic deformation, generating radial contact force to ensure a low-resistance, high-reliability electrical path with the pin surface, guaranteeing efficient signal transmission.

[0037] The inner conductor 2 is made of beryllium bronze with a surface roughness Ra ≤ 0.1 μm. The material of the inner conductor 2 includes, but is not limited to, beryllium bronze. Using a high-conductivity metal as a conductor can improve signal transmission efficiency and reduce resistance loss. The inner conductor 2 is made of beryllium bronze and is machined into a specific shape and size through precision turning processes to ensure that its surface roughness reaches below Ra 0.1 μm, thereby reducing resistance loss during signal transmission.

[0038] The dielectric constant of insulating sleeve 3 is ≥3, and insulating sleeve 3 is made of PEI material. The material of insulating sleeve 3 includes, but is not limited to, PEI. Using a new material with low loss and high dielectric constant as the insulating medium of the adapter can effectively reduce energy loss during signal transmission. The dielectric constant of PEI material is higher than that of traditional polytetrafluoroethylene material, thus reducing signal loss.

[0039] See appendix Figure 2 As shown, the outer ends of both the first outer conductor 11 and the second outer conductor 12 are provided with second external threads 112 and 122. The thread pitch diameter tolerance is ≤4μm, and the thread angle is 55°±0.1°, ensuring compatibility with standard SSMA interfaces.

[0040] The inner wall of the insulating sleeve 3 is interference-fitted with the inner conductor 2, and the interference amount is 0.005~0.01mm. The interference fit can eliminate air gaps and reduce interface reflection.

[0041] In some specific embodiments, the outer wall of the housing 4 is provided with heat dissipation grooves, with a groove depth h = 0.8~1.2mm, a groove width w = 1.0~1.2mm, and a groove spacing p = 2.5~3.5mm. This ensures heat dissipation, reduces temperature rise, and prevents high-frequency thermal mismatch.

[0042] The adapter is manufactured as follows: During the outer conductor manufacturing, stainless steel is processed and assembled according to design requirements. A threaded connection ensures a tight connection, forming a complete outer conductor shielding structure. For the inner conductor 2, beryllium bronze is selected. Precision turning is used to machine the inner conductor 2 into a shape and size compatible with the outer conductor, ensuring a surface roughness of Ra0.1 or less to reduce signal transmission resistance loss. For the insulating sleeve 3, PEI material is used to create a shape and size compatible with the inner conductor 2, improving its density and dielectric properties. For the metal bushing 5, conductive material is used to create a shape and size compatible with the insulating sleeve 3 and the internal structure of the outer conductor. For the outer shell 4, stainless steel is used to create a shape and size compatible with the external structure of the outer conductor. Finally, the machined inner conductor 2, insulating sleeve 3, and outer conductor are assembled using high-precision assembly equipment to ensure concentricity and perpendicularity between components meet requirements. After assembly, comprehensive performance testing and debugging are performed, and parameters that do not meet requirements are fine-tuned until the design specifications are achieved.

[0043] Use of the adapter: In practical applications, connect the SSMA adapter of this invention to the port of the device requiring signal transfer using the standard RF connection method. Ensure a secure connection to avoid unstable signal transmission due to looseness. During use, select the appropriate operating parameters of the adapter based on the device's operating frequency and signal characteristics to achieve the best signal transmission effect.

[0044] The SSMA type adapter designed in this utility model has a compact structure and small tolerance, and its working frequency can be extended to 70GHz. It has low insertion loss and lower signal loss compared with traditional adapters. It has good connection stability under vibration environment and meets the needs of emerging fields such as 5G communication and satellite communication for 70GHz high-frequency signal transmission.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. An SSMA type adapter suitable for 70GHz high-frequency signal transmission, comprising an outer conductor, an inner conductor (2), and an insulating sleeve (3), characterized in that: The outer conductor consists of a first outer conductor (11) and a second outer conductor (12) arranged coaxially, and the two are connected by a threaded outer shell (4) in the middle; the outer conductor has an axially arranged mounting through hole (13) inside, and the inner conductor (2) is arranged in the mounting through hole (13), and the inner conductor (2) is coaxially arranged with the outer conductor; An annular groove (21) is provided in the middle of the inner conductor (2), and an insulating sleeve (3) and a metal bushing (5) are sequentially fitted inside the annular groove (21).

2. The SSMA type adapter suitable for 70GHz high frequency signal transmission according to claim 1, characterized in that: The inner ends of the first outer conductor (11) and the second outer conductor (12) are provided with a first external thread (111; 121); the inner side of the outer shell (4) is provided with an internal thread that is compatible with the first external thread (111; 121).

3. The SSMA type adapter suitable for 70GHz high frequency signal transmission according to claim 1, characterized in that: Both sides of the annular groove (21) are provided with stepped grooves (22), and the first retaining ring (61) and the second retaining ring (62) are respectively embedded in the two stepped grooves (22), and the axial gap between them and the insulating sleeve (3) is ≤0.005mm.

4. The SSMA type adapter suitable for 70GHz high frequency signal transmission according to claim 1, characterized in that: Both ends of the inner conductor (2) are radial elastic expansion sleeve structures (23).

5. The SSMA type adapter suitable for 70GHz high-frequency signal transmission according to claim 4, characterized in that: The expansion sleeve structure (23) is composed of 4 to 12 elastic claw pieces, and the thickness of the claw pieces is t = 0.15 ± 0.01 mm.

6. The SSMA type adapter suitable for 70GHz high frequency signal transmission according to claim 1, characterized in that: The inner conductor (2) is made of beryllium bronze and has a surface roughness Ra≤0.1μm.

7. The SSMA type adapter suitable for 70GHz high-frequency signal transmission according to claim 1, characterized in that: The dielectric constant of the insulating sleeve (3) is ≥3, and the insulating sleeve (3) is made of PEI material.

8. The SSMA type adapter suitable for 70GHz high frequency signal transmission according to claim 1, characterized in that: The outer ends of the first outer conductor (11) and the second outer conductor (12) are both provided with second external threads (112; 122).

9. The SSMA type adapter suitable for 70GHz high frequency signal transmission according to claim 1, characterized in that: The inner wall of the insulating sleeve (3) is interference-fitted with the inner conductor (2), and the interference amount is 0.005~0.01mm.

10. The SSMA type adapter suitable for 70GHz high frequency signal transmission according to claim 1, characterized in that: The outer wall of the outer shell (4) is provided with heat dissipation grooves, with groove depth h=0.8~1.2mm, groove width w=1.0~1.2mm, and groove spacing p=2.5~3.5mm.

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