Coaxial test probe

Abstract

The utility model relates to the technical field of signal testing, in particular to a coaxial testing probe which comprises a communication connector, a cable and a probe head assembly which are sequentially arranged from top to bottom, and the cable comprises a center conductor, an insulating layer, a shielding layer and an outer surface layer which are sequentially connected in a sleeving mode from inside to outside. Wherein the insulating layer, the shielding layer and the outer surface layer are vertically arranged cylindrical structures, the two ends of the shielding layer extend out of the outer surface layer, the two ends of the insulating layer extend out of the shielding layer, and the two ends of the central conductor extend out of the insulating layer; the top end of the center conductor is connected with the communication connector through a center pin, and the bottom end of the center conductor is connected with the probe head assembly. According to the invention, on the basis of ensuring stable signal transmission, the overall structure is more compact and firmer by optimizing an internal connection process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of signal testing, in particular to a coaxial test probe. BACKGROUND

[0002] With the rapid development of radio frequency test and high-speed signal transmission in the fields of electronics, communication, microwave, etc., higher requirements are put forward for the performance of test equipment. As a key test tool, the coaxial test probe is widely used in accurate measurement and diagnosis of high-frequency signals, and plays a crucial role in ensuring signal transmission stability, anti-external electromagnetic interference and mechanical durability.

[0003] Although the existing coaxial test probe can meet the basic test requirements in the overall scheme, there is still room for improvement in the compactness and stability of the internal structure when meeting the requirements of high-frequency signal transmission and complex test environment. In some designs, the transition design of each connection part in signal transmission and mechanical fixation is not fine enough, which may cause the problems of suboptimal signal transmission connection or insufficient assembly firmness in actual use. Therefore, how to realize more compact and firm overall structure by optimizing the internal connection process on the basis of ensuring stable signal transmission has become a difficult problem to be solved. CONTENT OF THE INVENTION

[0004] In order to realize more compact and firm overall structure by optimizing the internal connection process on the basis of ensuring stable signal transmission, the present application provides a coaxial test probe. The present application provides the following technical scheme:

[0005] A coaxial test probe, comprising a communication connector, a cable and a probe head assembly arranged from top to bottom, the cable comprising a center conductor, an insulating layer, a shielding layer and an outer layer connected in sequence from inside to outside, wherein the insulating layer, the shielding layer and the outer layer are all vertically arranged cylindrical structures, both ends of the shielding layer protrude out of the outer layer, both ends of the insulating layer protrude out of the shielding layer, and both ends of the center conductor protrude out of the insulating layer; the top end of the center conductor is connected with the communication connector through a center pin, and the bottom end of the center conductor is connected with the probe head assembly.

[0006] In a specific implementable scheme, the top end of the shielding layer is fixedly connected with a solder cup, the solder cup is sleeved on the shielding layer, and the communication connector is sleeved on one end of the solder cup away from the probe head assembly.

[0007] In a specific implementable scheme, the outer wall of the top end of the shielding layer is connected with the inner wall of the solder cup through soldering tin of the solder cup.

[0008] In a specific embodiment, a spacer is provided between the cup and the center pin, and the spacer is in contact with the end of the cup and the end of the center pin.

[0009] In a specific embodiment, the top end of the center conductor extends into the center pin, and the outer wall of the top end of the center conductor is connected to the inner wall of the center pin by a center pin solder.

[0010] In a specific embodiment, the bottom end of the shielding layer extends into a needle tube shell, and the outer wall of the bottom end of the shielding layer is connected to the inner wall of the needle tube shell by a shielding layer solder.

[0011] In a specific embodiment, the bottom end of the shielding layer extends into a needle tube shell, and the outer wall of the bottom end of the shielding layer is connected to the inner wall of the needle tube shell by a shielding layer solder.

[0012] In a specific embodiment, the communication connector is an SMA threaded RF coaxial connector.

[0013] In summary, the beneficial effects of the present application include at least:

[0014] (1) By using a precise soldering process, the center conductor, center pin, and signal barrel are firmly fixed, ensuring the transmission of high-frequency signals between components without attenuation and low distortion. At the same time, the shielding layer and the insulating layer are designed reasonably, effectively isolating external electromagnetic interference, thereby greatly improving the stability and precision of the test signal.

[0015] (2) By using intermediate connecting parts such as the cup, spacer, and needle tube shell, the communication connector, cable, and probe head assembly are fixed as a whole by metal welding, forming a tightly connected structure. This not only enhances the overall mechanical strength but also effectively prevents connection loosening or breaking caused by vibration or bending.

[0016] The communication connector of the present coaxial test probe is connected to the test instrument, and the internal center pin and center conductor are precisely welded and fixed, allowing the test signal to be accurately transmitted. The insulating layer, shielding layer, and outer layer are arranged in a cylindrical structure, with each layer extending in order at both ends, ensuring effective isolation and electromagnetic shielding between components. At the same time, the cup, spacer, and needle tube shell are fixed by metal welding, not only enhancing the overall mechanical strength but also forming a compact and firm integrated structure between the cable, communication connector, and probe head assembly, effectively solving the problems of unstable signal transmission and loose assembly in high-frequency testing and complex environments.

[0017] The above description is only a summary of the technical scheme of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, the preferred embodiments of the present application are described in detail as follows with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a schematic diagram of the overall structure of a coaxial test probe in the embodiment.

[0019] Figure 2 Fig. 2 is a schematic diagram of the explosion of a coaxial test probe in the embodiment. Figure 1

[0020] Figure 3 Fig. 3 is a schematic diagram of the explosion of a coaxial test probe in the embodiment. Figure 2

[0021] Reference signs: 1, cable; 11, center conductor; 111, probe solder; 112, center pin solder; 12, insulating layer; 13, shielding layer; 131, shielding layer solder; 132, solder cup solder; 14, outer layer; 2, needle tube shell; 3, communication connector; 4, center pin; 5, isolation sheet; 6, solder cup; 7, probe head assembly; 71, signal barrel; 72, insulating needle. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application are described in further detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings, not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0024] The terms "include" and "have" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units not listed or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0025] ​​Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combinable with other embodiments.

[0026] The application discloses a coaxial test probe.

[0027] With reference to Figure 1 , the coaxial test probe comprises a communication connector 3, a cable 1 and a probe head assembly 7 connected in sequence from top to bottom, in combination Figure 2 and Figure 3 , the cable 1 is composed of a center conductor 11, an insulation layer 12, a shielding layer 13 and an outer layer 14 connected in sequence from inside to outside, wherein the center conductor 11 is used for transmitting test signals, the insulation layer 12 is used for isolating the center conductor 11 from the shielding layer 13 to prevent short circuit, the shielding layer 13 is used for shielding external electromagnetic interference to reduce signal loss and crosstalk. The outer layer 14 is used for mechanical protection, wear resistance and insulation protection. It should be noted that the insulation layer 12, the shielding layer 13 and the outer layer 14 are all vertically arranged cylindrical structures, both ends of the shielding layer 13 protrude out of the outer layer 14, both ends of the insulation layer 12 protrude out of the shielding layer 13, and both ends of the center conductor 11 protrude out of the insulation layer 12.

[0028] With reference to Figure 1 and Figure 2 , the communication connector 3 is internally connected with a center pin 4, the top end of the center conductor 11 protrudes into the center pin 4 away from the communication connector 3 and is fixedly connected with the center pin 4 through a center pin solder 112 on the inner wall thereof. The top end of the shielding layer 13 is sleeved with a solder cup 6, the bottom end of the communication connector 3 is fixedly connected with and sleeved in the solder cup 6 away from the probe head assembly 7, the top end of the shielding layer 13 protrudes into the solder cup 6 and is fixedly connected with the inner wall of the solder cup 6 through a solder cup solder 132 arranged on the outer wall of the shielding layer 13, and the arrangement of the solder cup 6 enables the communication connector 3 and the cable 1 to be fixed together as a whole, and in the application, the communication connector 3 is specifically an SMA threaded RF coaxial connector. The solder cup 6 as an intermediate connecting piece fixes the cable 1 and the communication connector 3 together, in addition, the metal material and the soldering fixing mode of the solder cup 6 enhance the mechanical strength between the cable 1 and the communication connector 3, preventing the connection from loosening or breaking due to vibration or bending.

[0029] With reference to Figure 1 and Figure 2 , an isolation sheet 5 is arranged between the solder cup 6 and the center pin 4, the two ends of the isolation sheet 5 are respectively abutted with the end portions of the solder cup 6 and the center pin 4, the isolation sheet 5 is used for isolating the solder cup 6 from the center pin 4 to prevent signal short circuit and simultaneously provide structural support.

[0030] Referring to Figure 1 and Figure 3 The bottom end of the shielding layer 13 is fixedly connected with the needle tube shell 2, which is arranged outside the probe head assembly 7. Specifically, the bottom end of the shielding layer 13 extends into the needle tube shell 2, and the outer wall of the bottom end of the shielding layer 13 is connected with the inner wall of the needle tube shell 2 through shielding layer soldering. The probe head assembly 7 includes a signal barrel 71 and a sleeve and an insulated needle head 72, the insulated needle head 72 is sleeved on the end of the signal barrel 71 away from the cable 1, and the bottom end of the center conductor 11 extends into the signal barrel 71 and is fixedly connected with the inner wall of the signal barrel 71 through probe soldering 111. The signal barrel 71 serves as an extension of the center conductor 11, and transmits signals from the cable 1 to the contact point of the insulated needle head 72. At the same time, the bottom end of the center conductor 11 is wrapped and fixed to prevent it from bending or breaking.

[0031] In summary, in the actual test process, the operator first connects the communication connector 3 of the coaxial test probe to the test instrument, and through the precise welding and fixation of the internal center needle 4 and the center conductor 11, the test signal can be accurately transmitted; the insulating layer 12, the shielding layer 13 and the outer surface layer 14 in the cable 1 are arranged in a cylindrical structure, and each layer is sequentially extended at both ends to ensure effective isolation and electromagnetic shielding between each component; at the same time, the intermediate connecting pieces such as the solder cup 6, the isolation sheet 5 and the needle tube shell 2 are fixed by metal welding, which not only enhances the overall mechanical strength, but also forms a compact and firm integrated structure between the cable 1 and the communication connector 3 and the probe head assembly 7, effectively solving the problems of unstable signal transmission and loose assembly in high-frequency testing and complex environments.

[0032] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A coaxial test probe, characterized by, The application relates to a communication joint, a cable and a probe head assembly arranged in sequence from top to bottom, wherein the cable comprises a center conductor, an insulation layer, a shielding layer and an outer layer which are connected in sequence from inside to outside, the insulation layer, the shielding layer and the outer layer are all vertically arranged in a cylindrical structure, the two ends of the shielding layer are arranged outside the outer layer, the two ends of the insulation layer are arranged outside the shielding layer, and the two ends of the center conductor are arranged outside the insulation layer; the top end of the center conductor is connected with the communication joint through a center needle, and the bottom end of the center conductor is connected with the probe head assembly.

2. The coaxial test probe of claim 1, wherein, The top end of the shielding layer is fixedly connected with a solder cup, the solder cup is sleeved on the shielding layer, and the communication joint is sleeved on the end of the solder cup away from the probe head assembly.

3. The coaxial test probe of claim 2, wherein, The outer wall of the top end of the shielding layer is connected with the inner wall of the solder cup through soldering tin of the solder cup.

4. The coaxial test probe of claim 2, wherein, An isolation sheet is arranged between the solder cup and the center needle, and the two ends of the isolation sheet are respectively abutted with the end of the solder cup and the center needle.

5. The coaxial test probe of claim 1, wherein, The top end of the center conductor is arranged in the center needle, and the outer wall of the top end of the center conductor is connected with the inner wall of the center needle through center needle soldering tin.

6. The coaxial test probe of claim 1, wherein, A needle tube shell is arranged outside the bottom end of the shielding layer, the needle tube shell is arranged outside the probe head assembly, the bottom end of the shielding layer is arranged in the needle tube shell, and the outer wall of the bottom end of the shielding layer is connected with the inner wall of the needle tube shell through shielding layer soldering tin.

7. The coaxial test probe of claim 1, wherein, The probe head assembly comprises a signal cylinder and an insulation needle, the insulation needle is sleeved on the end of the signal cylinder away from the cable, the bottom end of the center conductor is arranged in the signal cylinder, and the outer wall of the bottom end of the center conductor is connected with the inner wall of the signal cylinder through probe soldering tin.

8. The coaxial test probe of claim 1, wherein, The communication joint is an SMA screw type radio frequency coaxial connector.

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