Radio frequency coaxial connector

Abstract

The utility model discloses a radio frequency coaxial connector, which comprises an N-head insulator, an SMA head insulator, an inner conductor, an outer conductor, a shell and a nut, the jack end of the inner conductor is arranged in the SMA insulator, and the SMA insulator is arranged in the shell; the pin end of the inner conductor is arranged in the N-head insulator, and the N-head insulator is arranged in the outer conductor; the outer conductor is fixedly arranged in the shell, and the outer surface of the shell is sleeved with a nut; the front end of the contact surface of the shell and the SMA head insulator is provided with a step-shaped limiting structure used for preventing the SMA head insulator from loosening and falling off, and the front end of the contact surface of the outer conductor and the N head insulator is provided with a step-shaped limiting structure used for preventing the SMA head insulator from loosening and falling off. According to the utility model, the step is adopted to fix the inner conductor instead of a traditional barb mode, thereby effectively avoiding movement or falling caused by repeated plugging, ensuring the stability of the inner conductor, and improving the structural integrity of the connector in frequent use and high vibration environments at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of radio frequency connector technology, and in particular relates to a radio frequency coaxial connector. Background Technology

[0002] Currently, in the field of radio frequency (RF) communication, RF coaxial connectors are a commonly used connection device, widely applied in various high-frequency signal transmission scenarios. However, the N-to-SMA female RF connectors commonly found in existing technologies have revealed some significant shortcomings in practical applications.

[0003] First, existing products generally use barbs to secure the inner conductor. While this method is simple, it leads to frequent changes in force on the inner conductor during connector insertion and removal. Especially after repeated insertions and removals, the barb design fails to effectively restrain the position of the inner conductor, causing it to shift or even detach. This not only affects the mechanical reliability of the connector but may also lead to abnormal electrical performance, thus affecting the stability of signal transmission.

[0004] Secondly, in terms of frequency performance, current connector structures are insufficient to meet the demands of high-frequency bands. Their frequency limit is difficult to reach 18GHz, and signal reflection is significant and standing wave ratios are high in high-frequency scenarios. This problem severely restricts the applicability of existing RF coaxial connectors in high-frequency applications and is detrimental to meeting the ever-increasing demands for high-frequency communication.

[0005] Therefore, to address the above shortcomings, there is an urgent need for a new type of RF coaxial connector. An ideal new design should exhibit significant improvements in both mechanical structure and electrical performance, overcoming existing problems such as internal conductor movement and high standing wave ratios, providing a more stable and reliable solution for high-frequency applications. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a commonly used connection device.

[0007] The technical solution provided by this utility model is as follows:

[0008] A radio frequency coaxial connector includes an N-type insulator, an SMA-type insulator, an inner conductor, an outer conductor, a housing, and a nut. The inner conductor has a socket end disposed within the SMA insulator, which is disposed within the housing. The inner conductor also has a pin end disposed within the N-type insulator, which is disposed within the outer conductor. The outer conductor is fixedly disposed within the housing, and a nut is fitted onto the outer surface of the housing. A stepped limiting structure is provided at the front end of the contact surface between the housing and the SMA insulator to prevent the SMA insulator from loosening and falling off. The same stepped limiting structure is also provided at the front end of the contact surface between the outer conductor and the N-type insulator.

[0009] Furthermore, both the N-head insulator and the SMA-head insulator have stepped structures at their tail ends to compensate for impedance discontinuities caused by the step-like changes in the inner and outer conductors.

[0010] Preferably, the outer surface of the housing and the inner surface of the nut are provided with opposing grooves, and a retaining spring is provided in the groove for locking the nut to prevent it from falling out of the housing.

[0011] Furthermore, the internal gaps of the connector are filled with air.

[0012] Preferably, the outer conductor is interference-fitted within the housing.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] This invention employs a stepped fixing method for the inner conductor, replacing the traditional barbed method. This effectively avoids movement or detachment caused by repeated insertion and removal, ensuring the stability of the inner conductor and improving the structural integrity of the connector under frequent use and high vibration environments. Regarding high-frequency electrical performance, the use of air-filled dielectric reduces the dielectric constant, significantly reducing loss and reflection in high-frequency signal transmission, resulting in an extremely low VSWR at 18GHz. Simultaneously, the impedance discontinuity between the inner and outer conductors is compensated for by the stepped design at the insulator end, further optimizing signal integrity and stability. In terms of assembly, the modular assembly method simplifies the production process. The inner conductor is assembled step-by-step with the insulator, shell, and outer conductor, using interference fit connections. This improves assembly efficiency and accuracy, enhances the tightness between components, and reduces defects caused by human error. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0016] Figure 1 This is a half-sectional view of an embodiment of the radio frequency coaxial connector provided by this utility model.

[0017] The reference numerals in the attached drawings are as follows: 1-N-head insulator, 2-outer conductor, 21-outer conductor step, 3-nut, 4-circlip, 5-outer shell, 51-outer shell step, 6-inner conductor, 7-SMA-head insulator. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] This embodiment provides an RF coaxial connector, such as... Figure 1 As shown, the connector mainly consists of an N-type insulator 1, an outer conductor 2, a nut 3, a snap ring 4, a housing 5, an inner conductor 6, and an SMA-type insulator 7. In this connector, the inner conductor 6 no longer uses a barbed fixing method, but is fixed by steps on the insulator and the housing.

[0020] Specifically, the front end of the outer casing 5 has a casing step 51 to block the SMA head insulator 7. The inner conductor 6 is inserted into the SMA insulator 7, and then the entire assembly is installed into the outer casing 5. Next, the pin end of the inner conductor 6 is inserted into the N-head insulator 1, and then the entire assembly is installed into the outer conductor 2. The outer conductor 2 has an outer conductor step 21 to fix the N-head insulator 1 and prevent it from falling off. The outer conductor 2 and the outer casing 5 are press-fitted using a tooling. A nut 3 is connected to the outer surface of the outer casing 5 via a retaining spring 4. The retaining spring 4 is located in a groove on the outer surface of the outer casing 5. During assembly, the outer casing 5 is pushed into the nut 3. When the groove on the inner surface of the nut 3 reaches the position of the retaining spring 4, the retaining spring elastically deforms and rebounds, thereby locking the nut 3 and preventing it from detaching from the outer casing 5.

[0021] The connector provided in this embodiment, except for the very thin supporting insulators at both ends, is entirely filled with air dielectric to reduce the dielectric constant of the dielectric, thereby achieving a very low standing wave ratio at 18GHz. Since the introduction of a certain step in the inner or outer conductor causes impedance discontinuities, this embodiment provides steps at the tail ends of both the N-head insulator 1 and the SMA-head insulator 7 to change the characteristic impedance and effectively compensate for the discontinuous capacitance of the step. This minimizes reflection at higher frequencies, thereby achieving stable and reliable electrical performance.

[0022] Regarding the fixing of the inner conductor, traditional barbed fixing methods suffer from the drawback of conductor shifting and detachment after repeated insertion and removal. This embodiment completely abandons the barbed method, achieving fixing by adding steps to the outer conductor and shell. Steps are also set at the tail ends of both N-head and SMA-head insulators to change the geometry, thereby accurately compensating for impedance discontinuities and further optimizing signal reflection performance. The steps at the front end of the shell prevent the SMA-head insulator from detaching, while the steps inside the outer conductor effectively fix the N-head insulator, ensuring the stability of the inner conductor during repeated insertion and removal. Through this improvement, the robustness and reliability of the mechanical structure are significantly enhanced, eliminating mechanical failures caused by loosening of the inner conductor in traditional designs.

[0023] This embodiment uses air as the primary filling medium in the connector's internal structure, retaining only an extremely thin supporting insulator, thus minimizing the dielectric constant. This design optimizes high-frequency signal transmission conditions, ensuring a very low VSWR at 18 GHz, thereby significantly reducing signal reflection. Furthermore, the introduction of air as the medium also plays a crucial role in improving signal integrity and reducing signal loss.

[0024] In terms of assembly process, this embodiment adopts a modular, step-by-step design, which greatly simplifies the production process. The inner conductor's socket end is first inserted into the SMA insulator, then the entire assembly is inserted into the outer shell. The inner conductor's pin end is then inserted into the N-head insulator, and finally, it is installed into the outer conductor. The outer shell and outer conductor are connected by an interference fit, which enhances the tightness between components and reduces human error during assembly. Furthermore, the modular design facilitates later maintenance, reducing complexity and cost.

[0025] The innovative design of the connector in this embodiment is also reflected in its environmental adaptability. By optimizing the press-fit connection between the shell and the outer conductor, the robustness between components is enhanced, enabling it to maintain high reliability even under harsh operating conditions such as high vibration and frequent insertion and removal. Overall, the connector in this embodiment successfully achieves a good balance between mechanical performance, electrical performance, and assembly efficiency, demonstrating great potential, especially in high-frequency applications. This solution not only overcomes the shortcomings of traditional designs but also provides a high-performance, highly reliable connector solution for high-frequency communication equipment.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A radio frequency coaxial connector, characterized in that, The device includes an N-type insulator, an SMA-type insulator, an inner conductor, an outer conductor, a housing, and a nut. The insertion end of the inner conductor is located inside the SMA insulator, which is located inside the housing. The pin end of the inner conductor is located inside the N-type insulator, which is located inside the outer conductor. The outer conductor is fixedly located inside the housing, and a nut is fitted onto the outer surface of the housing. The front end of the contact surface between the housing and the SMA-type insulator is provided with a stepped limiting structure to prevent the SMA-type insulator from loosening and falling off. The front end of the contact surface between the outer conductor and the N-type insulator is also provided with a stepped limiting structure to prevent the SMA-type insulator from loosening and falling off.

2. The radio frequency coaxial connector as described in claim 1, characterized in that, Both the N-head insulator and the SMA-head insulator have stepped structures at their tail ends to compensate for impedance discontinuities caused by the step-like changes in the inner and outer conductors.

3. A radio frequency coaxial connector as described in claim 1 or 2, characterized in that, The outer surface of the housing and the inner surface of the nut are provided with opposing slots, and a retaining spring is provided in the slot to lock the nut and prevent it from falling out of the housing.

4. A radio frequency coaxial connector as described in claim 1 or 2, characterized in that, The internal gaps of the connector are filled with air.

5. A radio frequency coaxial connector as described in claim 1 or 2, characterized in that, The outer conductor is interference-fitted inside the housing.

Images