High-frequency transmission TRT connector assembly

Abstract

The invention discloses a high-frequency transmission TRT connector assembly, which comprises a welding socket and a butt joint plug, and is characterized in that a first cavity for accommodating a welding cup and a curable dielectric material for electrical fine tuning are arranged in the welding socket; the core innovation of the butt joint plug is that a second cavity is formed in the front end of a supporting insulator of the butt joint plug, the cavity is filled with gas of which the dielectric constant is lower than that of an insulator material, and the second cavity is constructed to carry out impedance compensation on a plugging interface, so that the whole connector assembly presents characteristic impedance approaching 50 ohms within the frequency band of 0-5 GHz. The problem of high-frequency impedance mismatch is solved, the voltage standing-wave ratio is greatly reduced in a target frequency band, high-efficiency and low-loss transmission of high-frequency signals is achieved, it is ensured that the high-frequency signal transmission device has excellent long-term stability and production repeatability while meeting high-frequency electrical indexes, and therefore on the premise of being completely compatible with an existing standard TRT interface, the high-frequency signal transmission device can be widely applied to high-frequency signal transmission devices. The application frequency upper limit is successfully broken through, the applicability is high, and the market prospect is wide.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of connector technology, in particular to a high-frequency transmission TRT connector assembly. BACKGROUND

[0002] RF coaxial connectors are key components for signal transmission and connection in electronic devices, and their standardization is crucial for ensuring interconnection and interoperability between different devices. TRT series connectors, as a widely used military standard interface, have their mechanical dimensions, mating forms and basic electrical properties strictly specified by national standards. This standardized design ensures that products from different manufacturers have reliable mechanical interchangeability and can meet the basic signal transmission requirements within the specified frequency range. The existence of such standard interfaces provides a basic guarantee for the interconnection of devices in military and high-reliability civilian fields.

[0003] However, with the rapid development of modern electronic systems towards high frequency and wide bandwidth, signal transmission frequencies have generally been raised to the GHz level. When traditional standard TRT connectors are applied to high-frequency scenarios above 1GHz, 2GHz or even 5GHz, their electrical performance, especially the voltage standing wave ratio, will deteriorate dramatically. The fundamental reason is that existing standards mainly regulate mechanical interfaces and low-frequency performance, and do not require or optimize the impedance matching structure of the connector inside the wide frequency band, especially in the GHz frequency range. The internal insulating support of standard products is usually a solid and uniform structure. The transmission line formed by the center conductor, the shell and the internal insulating support will have significant parasitic parameters due to the discontinuity of the structure such as dielectric interface and conductor steps at high frequencies, resulting in a serious deviation of the characteristic impedance from the standard 50Ω, thus causing strong signal reflection, increased insertion loss and signal distortion. Therefore, how to fundamentally solve the impedance mismatch problem of the connector inside the 5GHz and above high-frequency band while strictly following the external interface dimensions of the TRT standard and ensuring complete mechanical interchangeability has become the main technical obstacle restricting the expansion of this series of connectors to modern high-frequency applications. SUMMARY

[0004] The purpose of the present application is to provide a high-frequency transmission TRT connector assembly to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A high-frequency transmission TRT connector assembly, characterized in that it comprises a soldering socket and a mating plug that is mated with the soldering socket. The soldering socket comprises: an inner shell, a center conductor coaxially arranged at the center position of the inner shell, an inner insulator arranged between the center conductor and the inner shell, The inner insulator has a first cavity at one end near the tail of the inner shell, and the center conductor has a welding cup at its tail, which is located in the first cavity. The inner shell has a through hole on its side wall that communicates with the first cavity; The docking plug includes: A mating conductor, the front end of which is used for electrical contact with the front end of the central conductor. A supporting insulator is fitted over the front end of the mating conductor. The front end of the supporting insulator has a second cavity, which is filled with a gas whose dielectric constant is less than that of the supporting insulator material; the front end of the supporting insulator has a mating groove at its center for accommodating the front end of the central conductor. The second cavity is configured to adjust the equivalent dielectric constant at the mating interface through the gas medium inside it, so that the connector assembly has a characteristic impedance close to 50Ω in the 0 to 5 GHz frequency band.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the second cavity is an annular cavity surrounding the docking conductor, and its axial cross-sectional shape is one of a rectangle, trapezoid, or arc.

[0008] Furthermore, the gas filled in the second cavity is air, nitrogen, or sulfur hexafluoride.

[0009] Furthermore, the material of the supporting insulator is polytetrafluoroethylene, polyetherimide, or polyimide.

[0010] Furthermore, the welding socket also includes: The outer shell is fitted over the outer part of the inner shell; An outer insulator is disposed between the inner housing and the outer housing; A locking sleeve is fitted onto the outside of the outer shell and is used to lock it in place with the docking equipment.

[0011] Furthermore, the welding socket also includes: A cover is screwed to the rear of the outer casing; An insulating pad is disposed on the side of the cover near the first cavity; The insulating gasket, after the cover is screwed on, abuts against or maintains a small gap with the welding cup, which is used to isolate the welding cup and the conductor core wire welded thereon from the cover and / or the outer shell, and to provide mechanical restraint.

[0012] Furthermore, the area between the solder cup and the soldered conductor core within the first cavity is filled with a curable dielectric material.

[0013] Furthermore, the curable dielectric material is silicone rubber.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention utilizes a second cavity filled with a low-dielectric-constant gas, located inside the front end of the supporting insulator of the connector. This structure is not simply hollow but rather an "impedance compensator" optimized through precise electromagnetic simulation. When the connector is mated, this air cavity actively adjusts the equivalent dielectric constant of the mating interface region, precisely offsetting the parasitic capacitance introduced by the mechanical fit of the standard interface and the dielectric step, thereby calibrating the characteristic impedance of the entire signal transmission channel to approximately 50Ω within a wide frequency range of 0 to 5 GHz. This directly solves the high-frequency impedance mismatch problem, significantly reducing the voltage standing wave ratio (VSWR) within the target frequency band, achieving efficient and low-loss transmission of high-frequency signals. This ensures that while meeting high-frequency electrical specifications, the invention possesses excellent long-term stability and production repeatability. Thus, while fully compatible with existing standard TRT interfaces, it successfully breaks through the upper limit of their application frequency, demonstrating strong applicability and broad market prospects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the welding socket and mating plug of the present invention; Figure 2 This is a schematic diagram of the welding socket of the present invention; Figure 3 This is a schematic diagram of the structure of the connector of the present invention.

[0016] Wherein: 100, welding socket; 110, inner shell; 111, through hole; 120, center conductor; 121, welding cup; 130, inner insulator; 131, first cavity; 140, outer shell; 150, outer insulator; 160, locking sleeve; 170, cover; 180, insulating gasket; 200, mating plug; 210, mating shell; 220, mating conductor; 230, supporting insulator; 231, second cavity; 232, mating groove; 300, wire; 400, curable dielectric material. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Please refer to the following: Figures 1 to 3 To achieve the above objectives, the present invention provides the following technical solution: A high-frequency transmission TRT connector assembly includes a detachable solder socket 100 and a mating plug 200, wherein the solder socket 100 is used for fixed installation and connection of cables, and the mating plug 200 is used for mating with the socket to achieve a signal path.

[0019] The welding socket 100 includes an inner housing 110, a center conductor 120, and an inner insulator 130. The center conductor 120 is coaxially mounted inside the inner housing 110 and supported and fixed by the inner insulator 130 to achieve electrical insulation and mechanical positioning. A first cavity 131 is formed near the tail end of the inner insulator 130. A welding cup 121 is machined at the tail end of the center conductor 120. The welding cup 121 is suspended in the first cavity 131. A through hole 111 communicating with the first cavity 131 is opened on the side wall of the inner housing 110 to provide a channel for the introduction of the conductor 300 core wire.

[0020] The plug 200 includes a mating conductor 220 and a supporting insulator 230. The front end of the mating conductor 220 is designed as a contact portion that mates with the front end of the socket center conductor 120. The supporting insulator 230 is tightly fitted around the front end of the mating conductor 220. A second cavity 231 is machined inside the front end of the supporting insulator 230. The second cavity 231 is pre-filled with air or other low dielectric constant gas. A mating groove 232 is provided at the center of the front end of the supporting insulator 230 to accommodate and guide the front end of the socket center conductor 120 during insertion.

[0021] When the soldering socket 100 and the mating plug 200 are inserted, and the front end of the center conductor 120 enters the mating groove 232 and contacts the mating conductor 220, a complex electromagnetic field environment is formed in the mating interface area, which is composed of the center conductor 120, the front end of the inner insulator 130, the supporting insulator 230, and the gas in the second cavity 231. The second cavity 231 is actually an "impedance compensation structure" optimized by precise electromagnetic simulation. By selecting the gas medium and reasonably designing the cavity size, this structure can actively and locally reduce the equivalent dielectric constant of the mating area, thereby accurately compensating for the parasitic capacitance introduced by inherent factors such as interface mechanical fit and dielectric step. Its final technical effect is to "calibrate" the characteristic impedance of the entire connection channel in the 0 to 5 GHz wide frequency range to close to the standard 50Ω, fundamentally solving the impedance mismatch problem of traditional TRT connectors at high frequencies and achieving excellent voltage standing wave ratio performance.

[0022] like Figure 3As shown, the second cavity 231 is preferably designed as an annular cavity surrounding the mating conductor 220. The axial cross-sectional shape of the second cavity 231 can be selected according to the compensation requirements: for example, a rectangular cross-section is easy to process and control in terms of size; a trapezoidal cross-section can achieve a gradual transition of impedance, which helps to broaden the matching bandwidth; an arc-shaped cross-section is beneficial to improve the electric field distribution and reduce edge effects. These specific shapes are all for achieving accurate impedance compensation. The gas medium filled in the second cavity 231 is the key to the realization of the compensation function. In this embodiment, the gas medium is limited to a gas with a dielectric constant lower than that of the supporting insulator 230 material. Preferably, the most economical and convenient choice of gas medium is air. In applications requiring higher stability or special environments, nitrogen or sulfur hexafluoride can be filled. These gases share the characteristic that their dielectric constant is significantly lower than that of solid insulating materials such as PTFE, thus providing the possibility of adjusting the equivalent dielectric constant.

[0023] like Figure 3 As shown, the choice of material for the support insulator 230 is crucial to high-frequency performance. The support insulator 230 can be made of polytetrafluoroethylene (PTFE) because it has extremely low dielectric loss and a stable dielectric constant, making it an ideal choice for high-frequency applications. Alternatively, polyetherimide or polyimide can be used. These materials have good mechanical strength, heat resistance, and processability, while also meeting the electrical performance requirements in the GHz band.

[0024] like Figure 2 As shown, the soldering socket 100 further includes a housing 140, an outer insulator 150, and a locking sleeve 160. The housing 140 is fitted over the inner housing 110, forming the outer body of the connector. The outer insulator 150 fills the space between the inner and outer housings, providing additional electrical insulation and mechanical support. The locking sleeve 160 is movably fitted over the housing 140 via threads or other means. Its function is to securely lock the plug 200 to the mating device by tightening the locking sleeve 160 after insertion, ensuring reliable connection and good shielding continuity. This part of the structure is mainly inherited from the standard TRT interface to ensure the mechanical compatibility and installation reliability of the components.

[0025] like Figure 1 and Figure 2As shown, the welding socket 100 also includes a cover 170 and an insulating gasket 180. The cover 170 is threaded onto the rear end of the housing 140 to seal the rear end of the welding socket 100. An insulating gasket 180 is provided inside the cover 170. The insulating gasket 180 is made of high-performance engineering plastic. When the cover 170 is finally tightened, the insulating gasket 180 is pushed into the first cavity 131, and its inner end face forms a tight abutment with the welding cup 121 of the center conductor 120, or maintains a very small, controlled safety gap. The insulating gasket 180... As a reliable insulating barrier, the insulating pad 180 physically isolates the solder cup 121 and any burrs, splattered solder, or exposed conductor 300 core wires that may exist on the solder joint from the metal cover 170 and the outer casing 140, completely eliminating the risk of short circuits and significantly improving the long-term reliability of the product in harsh environments such as vibration and humidity. At the same time, the insulating pad 180 also applies an axial restraint force to the solder cup 121, which can effectively prevent the solder joint from loosening or fatigue fracture due to cable stress or environmental vibration, and enhance the mechanical stability of the connection.

[0026] like Figure 1 and Figure 2 As shown, this invention introduces a unique performance fine-tuning step in the welding process. After welding the core wire of the conductor 300 to the welding cup 121, uncured curable dielectric material 400 is injected into the solder joint area within the first cavity 131. This curable dielectric material 400 is preferably silicone rubber, which has fluidity before curing and its dielectric constant is between that of air and PTFE. After injecting the silicone rubber, the operator uses a vector network analyzer to perform a standing wave ratio (SWR) test on the semi-finished socket. Minor geometric differences in the solder joint area affect the high-frequency distribution parameters. By observing the test curve, the amount of silicone rubber injected can be fine-tuned in real time, and tools can be used to guide it to wrap specific parts of the solder joint, thereby subtly changing the equivalent capacitance of that area. This proactive intervention process of "testing and adjusting simultaneously" effectively compensates for random electrical deviations caused by manual welding and other processes, actively "tuning" the SWR performance of each product to near the optimal design value. Once the performance meets the standards, the silicone rubber is cured by standing or heating to form a stable, curable dielectric filler. This process ensures excellent consistency and repeatability of product performance and is key to achieving high-quality mass production.

[0027] A method for manufacturing the above-mentioned soldered socket 100, the method specifically includes the following steps: S1: Wire soldering: Pass the core wire of the wire 300 through the through hole 111 of the inner housing 110 and reliably solder it to the solder cup 121 at the tail of the center conductor 120; S2: Inject fine-tuning material: Using a syringe or other tools, inject an appropriate amount of uncured curable dielectric material 400 into the welding area between the welding cup 121 and the core wire in the first cavity 131; S3: Preliminary assembly: Place the insulating pad 180 inside the cover 170, and then screw the cover 170 assembly into the tail of the housing 140, but do not need to tighten it completely; S4: Performance Testing and Dynamic Tuning: Use a vector network analyzer connected to the semi-finished socket to test its VSWR; based on the real-time test results, the cover 170 can be slightly rotated to change the pressure distribution of the insulating gasket 180 to the welding cup, or the shape of the silicone rubber can be supplemented / adjusted through the reserved gap, and the changes in the VSWR curve can be observed until it reaches the optimal level. S5: Final Curing and Locking: After confirming that the performance meets the standards, fully tighten the cover 170 to the specified torque. Subsequently, allow the silicone rubber to fully cure by resting at room temperature or heating, completing the manufacturing of the soldered socket. This method integrates structural assembly and electrical performance optimization, and is the core process ensuring the high performance of the high-frequency TRT connector assembly of this invention.

[0028] Working principle: In application, the soldering socket 100 is first fixedly installed on the equipment panel or cable terminal via its locking sleeve 160. Then, the corresponding mating plug 200 is installed on the other end of the equipment or cable to be connected. When a connection is needed, the front end of the mating conductor 220 of the mating plug 200 is aligned with the front end of the center conductor 120 of the soldering socket 100, inserted, and the mating housing 210 is initially engaged with the socket locking sleeve 160. The locking sleeve 160 is then tightened, driving the mating plug 200 to fully engage with the soldering socket 100. During this process, the front end of the socket's center conductor 120 smoothly inserts into the plug support insulator 230. The mating groove 232 establishes reliable electrical contact with the mating conductor 220. Simultaneously, the second cavity 231 located inside the mating plug 200 begins to perform impedance compensation, optimizing the electromagnetic field distribution at the mating interface and ensuring that the signal passes through the entire connection interface with minimal reflection within the 0-5GHz frequency band. The solder joints inside the solder socket 100, protected by the insulating gasket 180, and the soldering area finely adjusted by silicone rubber, together ensure the stability and reliability of the electrical connection at the input end. Thus, this invention achieves high-fidelity and high-efficiency transmission of high-frequency signals while fully compatibility with the mechanical dimensions of the standard TRT interface.

[0029] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A high-frequency transmission TRT connector assembly, characterized in that, Includes a welding socket (100) and a mating plug (200) that mates with the welding socket (100); The welding socket (100) includes: an inner housing (110); The central conductor (120) is coaxially disposed at the center of the inner housing (110); An inner insulator (130) is disposed between the central conductor (120) and the inner shell (110); The inner insulator (130) has a first cavity (131) at one end near the tail of the inner shell (110), and the center conductor (120) has a solder cup (121) at its tail, which is located inside the first cavity (131). The inner shell (110) has a through hole (111) communicating with the first cavity (131) on its side wall; a wire (300) is welded on the welding cup (121), and the wire (300) passes through the through hole (111). The mating plug (200) includes: A docking conductor (220) having its front end used for electrical contact with the front end of the center conductor (120); A supporting insulator (230) is sleeved on the front end of the mating conductor (220); The front end of the supporting insulator (230) is provided with a second cavity (231), which is filled with a gas whose dielectric constant is less than that of the supporting insulator (230) material; a docking groove (232) is provided at the center of the front end of the supporting insulator (230).

2. The high-frequency transmission TRT connector assembly according to claim 1, characterized in that, The second cavity (231) is an annular cavity surrounding the docking conductor (220), and its axial cross-sectional shape is one of rectangle, trapezoid or arc.

3. The high-frequency transmission TRT connector assembly according to claim 1, characterized in that, The second cavity (231) is filled with air, nitrogen or sulfur hexafluoride.

4. The high-frequency transmission TRT connector assembly according to claim 1, characterized in that, The supporting insulator (230) is made of polytetrafluoroethylene, polyetherimide or polyimide.

5. A high-frequency transmission TRT connector assembly according to claim 1, characterized in that, The welding socket (100) also includes: The outer shell (140) is fitted over the outer shell (110); An outer insulator (150) is disposed between the inner housing (110) and the outer housing (140); A locking sleeve (160) is fitted over the outer shell (140) for locking with the docking equipment.

6. A high-frequency transmission TRT connector assembly according to claim 5, characterized in that, The welding socket (100) also includes: A cover (170) is screwed to the tail of the outer casing (140); An insulating pad (180) is provided on the side of the cover (170) near the first cavity (131); the insulating pad (180) is used to isolate the core wire of the welding cup (121) and the wire (300) welded thereon from the cover (170) and / or the outer shell (140).

7. A high-frequency transmission TRT connector assembly according to claim 6, characterized in that, The area between the welding cup (121) and the welded conductor (300) core is filled with a curable dielectric material (400).

8. A high-frequency transmission TRT connector assembly according to claim 7, characterized in that, The curable dielectric material (400) is silicone rubber.

Images