Coaxial shunt frequency characteristic detection clamp and device

Abstract

The utility model provides a coaxial diverter frequency characteristic detection clamp comprising a first connecting part and a second connecting part, the first connecting part and the second connecting part are coaxially arranged from outside to inside and are made of conductive materials, the second connecting part is matched with the first connecting part, and the first connecting part is matched with the second connecting part. And the second connecting part is used for installing and fixing a coaxial shunt and is electrically connected with the coaxial shunt, and the second connecting part is provided with adaptive impedance corresponding to the signal source and the detection circuit. According to the coaxial diverter frequency characteristic detection clamp provided by the utility model, the first connecting part and the second connecting part are matched with each other to realize connection and fixation of the coaxial diverter, and the second connecting part is provided with the adaptive impedance corresponding to the signal source and the detection circuit, so that the coaxial diverter frequency characteristic detection clamp can be used for detecting the frequency characteristic of the coaxial diverter. And the accuracy of frequency characteristic detection of the coaxial shunt is greatly improved. The utility model also provides a coaxial shunt frequency characteristic detection device.

Description

[Technical Field]

[0001] This utility model relates to the field of electronic circuit testing technology, and in particular to a coaxial shunt frequency characteristic testing fixture and device. [Background Technology]

[0002] In the field of electronic measurement, it is often necessary to measure high-frequency (above 100MHz) current waveforms. To reduce the parasitic inductance of the shunt, coaxial shunts are commonly used in the industry for high-frequency current detection. For example... Figure 1 The diagram shows an existing coaxial shunt. This coaxial shunt, by incorporating an outer conductor, a resistive element, and a central shaft conductor, allows high-frequency current to flow coaxially and in opposite directions through the central shaft conductor, the resistive element, and the outer conductor. The magnetic fields generated by the high-frequency currents on the central shaft conductor and the outer conductor cancel each other out, thereby reducing the need for measuring high-frequency currents.

[0003] After the coaxial shunt is manufactured, its frequency characteristics need to be tested. For example... Figure 2 As shown, the frequency f of the high-frequency current signal input to the input terminal of the coaxial shunt increases from 0 Hz. When the frequency f reaches a certain value, the coaxial shunt detects an error, and the detected signal corresponds to an increase in the calculated impedance Rs of the resistive element. When the change in the impedance Rs exceeds 3 dB, a first frequency value f1 is obtained. If the frequency continues to increase, the error becomes too large, and the coaxial shunt cannot be used normally. At this point, the impedance Rs and the first frequency value f1 correspond to the various parameters included in the detected frequency characteristics of the coaxial shunt.

[0004] However, existing technologies primarily rely on simulation analysis and direct wire bonding between the coaxial shunt and the signal source and detection circuit for testing. Due to impedance mismatch between the signal source, detection circuit, or transmission line and the coaxial shunt, the transmitted signal is reflected, resulting in standing waves on the transmission line, especially noticeable in high-frequency signal transmission. This leads to significant errors in the test results, failing to accurately reflect the frequency characteristics of the coaxial shunt. Furthermore, existing wire bonding methods require soldering before testing and solder removal afterward, making the process highly inconvenient. [Utility Model Content]

[0005] This utility model provides a coaxial shunt frequency characteristic testing fixture and device to solve the problems of inconvenient measurement and large error mentioned above, so as to ensure the convenience of testing and improve the accuracy of test results.

[0006] This utility model provides a coaxial shunt frequency characteristic testing fixture, including a first connecting part and a second connecting part. The first connecting part has a receiving cavity inside. The second connecting part is housed in the receiving cavity. The first connecting part and the second connecting part are coaxially arranged from the outside to the inside and are both made of conductive material. The second connecting part cooperates with the first connecting part to install and fix the coaxial shunt and is electrically connected to the coaxial shunt. The second connecting part is provided with an adapter impedance corresponding to the signal source and the detection circuit.

[0007] This utility model provides a coaxial shunt frequency characteristic detection device, including a signal source, a detection circuit, and a coaxial shunt frequency characteristic detection fixture. The signal source is used to generate a high-frequency radio frequency voltage, and the detection circuit is used to connect to the coaxial shunt and analyze and detect the voltage signal shunted by the coaxial shunt. The coaxial shunt frequency characteristic detection fixture is electrically connected to the signal source and the coaxial shunt, and includes a first connecting part and a second connecting part. The first connecting part has a receiving cavity inside. The second connecting part is housed in the receiving cavity. The first connecting part and the second connecting part are coaxially arranged from the outside to the inside and are both made of conductive material. The second connecting part cooperates with the first connecting part to install and fix the coaxial shunt and is electrically connected to the coaxial shunt. The second connecting part is provided with an adapter impedance corresponding to the signal source and the detection circuit.

[0008] Compared with the prior art, the coaxial shunt frequency characteristic testing fixture provided by this utility model achieves connection and fixation of the coaxial shunt through the cooperation of the first connecting part and the second connecting part. The first connecting part is used to connect the outer conductor, and the second connecting part is used to connect the central shaft conductor. The coaxial shunt is connected to the signal source through the coaxial shunt frequency characteristic testing fixture without the need for additional soldered wires, making the testing process more convenient. Both the first connecting part and the second connecting part are made of conductive material and are coaxially arranged, so that the high-frequency signal used for testing will not be affected by magnetic field interference when flowing through the coaxial shunt frequency characteristic testing fixture. Moreover, by setting an adapter impedance corresponding to the signal source and the detection circuit in the second connecting part, the accuracy of the coaxial shunt frequency characteristic testing is greatly improved.

[0009] The coaxial shunt frequency characteristic detection device uses the coaxial shunt frequency characteristic detection fixture in conjunction with the signal source and the detection circuit to effectively detect the frequency characteristics of the coaxial shunt with high accuracy. The coaxial shunt frequency characteristic detection device is relatively simple, easy to use and operate, and suitable for coaxial shunt manufacturers and users to use for testing. [Attached Image Description]

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0011] Figure 1 This is a cross-sectional view of the coaxial splitter in the prior art;

[0012] Figure 2 This is a waveform diagram of the frequency response of the coaxial shunt during testing;

[0013] Figure 3 This is a schematic diagram of the frame of the coaxial shunt frequency characteristic detection device provided by this utility model;

[0014] Figure 4 This is a three-dimensional structural diagram of the coaxial shunt frequency characteristic detection fixture provided by this utility model;

[0015] Figure 5 This is an exploded view of the coaxial shunt frequency characteristic testing fixture provided by this utility model;

[0016] Figure 6 This is a cross-sectional view of the coaxial shunt frequency characteristic detection fixture provided by this utility model;

[0017] Figure 7 This is a cross-sectional view of the coaxial shunt frequency characteristic detection fixture provided by this utility model connected to the coaxial shunt;

[0018] Figure 8 This is a topology diagram of the coaxial shunt frequency characteristic detection device provided by this utility model; and

[0019] Figure 9 The waveform diagram is obtained by detecting the frequency characteristics of the coaxial shunt using the frequency characteristic detection device provided by this utility model.

Detailed Implementation Methods

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] Please see Figure 3 The coaxial shunt frequency characteristic detection device 100 includes a signal source 1, a detection circuit 3, and a coaxial shunt frequency characteristic detection fixture 5. The signal source 1 generates a high-frequency radio frequency voltage. The detection circuit 3 connects to the coaxial shunt 20 and analyzes and detects the voltage signal shunted by the coaxial shunt 20. The coaxial shunt frequency characteristic detection fixture 5 is electrically connected to both the signal source 1 and the coaxial shunt 20. The coaxial shunt frequency characteristic detection device 100 achieves electrical connection between the coaxial shunt 20 and the signal source 1 through the coaxial shunt frequency characteristic detection fixture 5, eliminating the need for wire bonding and improving the accuracy of frequency characteristic detection of the coaxial shunt 20.

[0026] It should be noted that the signal source 1 is mainly used to provide high-frequency radio frequency voltage signals, and its specific structure and implementation are not limited here. The signal source 1 and the detection circuit 3 can be housed in a single component for easy portability, installation, and use. For example, existing vector network analyzers can provide both the signal source 1 and the detection circuit 3 simultaneously. The coaxial shunt 20, for detecting high-frequency current signals, generally has a BNC connector on its output side. Therefore, the detection circuit 3 and the coaxial shunt 20 can be connected via a coaxial cable (not shown) or directly to achieve detection of the coaxial shunt 20, eliminating the need for soldering wires and further improving detection accuracy. The coaxial shunt frequency characteristic detection device 100, using the coaxial shunt frequency characteristic detection fixture 5 in conjunction with the signal source 1 and the detection circuit 3, can effectively detect the frequency characteristics of the coaxial shunt 20 with high accuracy. The coaxial shunt frequency characteristic detection device 100 is relatively simple, easy to carry and use, and easy to operate.

[0027] Please also refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 These are, respectively, a three-dimensional structural schematic diagram, an exploded view, a cross-sectional view, and a cross-sectional view connecting the coaxial shunt 20 to the frequency characteristic testing fixture 5 provided by this utility model. The coaxial shunt frequency characteristic testing fixture 5 includes a first connecting part 51 and a second connecting part 53. The first connecting part 51 has a receiving cavity 511 inside; the second connecting part 53 is housed in the receiving cavity 511. The first connecting part 51 and the second connecting part 53 are coaxially arranged from the outside to the inside and are both made of conductive material. The second connecting part 53 cooperates with the first connecting part 51 to install and fix the coaxial shunt 20 and is electrically connected to the coaxial shunt 20.

[0028] The coaxial shunt frequency characteristic testing fixture 5, by coaxially arranging the first connecting part 51 and the second connecting part 53, both made of conductive material, can achieve accurate transmission of electrical signals between the signal source 1 and the coaxial shunt 20 while simultaneously installing and fixing the coaxial shunt 20, thus reducing interference from high-frequency current signals on the testing results. The method for reducing interference is explained below:

[0029] The coaxial shunt 20 includes an outer conductor 21, a central axis conductor 23, and a resistor 25. The first connecting part 51 is electrically connected to the outer conductor 21, and the second connecting part 53 is connected to the central axis conductor 23. The signal source 1 is electrically connected to the coaxial shunt 20 through the first connecting part 51 and the second connecting part 53. The coaxial shunt frequency characteristic detection fixture 5 is equivalent to a coaxial bidirectional conductor that can simultaneously connect to the signal source 1 and the coaxial shunt 20. The high-frequency current flow direction in the first connecting part 51 is the same as that in the outer conductor 21, and the high-frequency current flow direction in the second connecting part 53 is the same as that in the central axis conductor 23. Moreover, the high-frequency current flow directions in the second connecting part 53 and the central axis conductor 23 are completely opposite to those in the first connecting part 51 and the outer conductor 21. Therefore, the magnetic fields formed by the high-frequency currents flowing through the first connecting part 51 and the second connecting part 53 cancel each other out, preventing the formation of parasitic inductance and thus eliminating interference from the high-frequency current signal on the detection results. The coaxial shunt frequency characteristic detection fixture 5, through the coaxial arrangement of the first connecting part 51 and the second connecting part 53, achieves the same effect as the coaxial shunt 20 in eliminating high-frequency current signal interference, thereby improving the accuracy of the measurement.

[0030] Of course, it should be noted that the first connecting part 51 and the second connecting part 53 are not interconnected. The relative position between them can be fixed by setting an insulating member 55. The specific structure and setting position of the insulating member 55 are not further restricted here.

[0031] To improve the adaptability of the coaxial shunt frequency characteristic detection fixture 5, the second connecting part 53 is provided with an adapting impedance 57 corresponding to the signal source 1 and the detection circuit 3. Since the signal source 1 and the detection circuit 3 each have a certain impedance, and the resistance of the resistor 25 in the coaxial shunt 20 is very low and negligible, a suitable adapting impedance 57 is needed to ensure more accurate detection of the frequency characteristics of the coaxial shunt 20. Both the first connecting part 51 and the second connecting part 53 are made of conductive material. A certain adapting impedance 57 is provided on each of the first connecting part 51 and the second connecting part 53, and then connected to the coaxial shunt 20, thus integrating the entire assembly into the signal source 1 and the detection circuit 3. This ensures that the impedances of each part are consistent, thereby improving the detection accuracy of the coaxial shunt 20.

[0032] In this embodiment, the adapter impedance 57 is set to 50 ohms. Currently, devices on the market that provide the signal source 1 or the detection circuit 3 all have a built-in impedance of 50 ohms. For example, various models of vector network analyzers on the market all have a built-in 50-ohm impedance in their signal source 1 and detection circuit 3. Therefore, by setting the adapter impedance 57 to 50 ohms, the coaxial shunt frequency characteristic detection fixture 5 can be used in a wider range of scenarios and can effectively improve the accuracy of the frequency characteristic detection of the coaxial shunt 20.

[0033] To further address the reliability issue of the adapting impedance 57, the second connection portion 53 includes a resistor R for providing the adapting impedance 57. A 50-ohm resistor can be directly soldered into the second connection portion 53 to provide the adapting impedance 57. This eliminates the need for a separate connection to the first connection portion 51, simplifying installation and facilitating detection and identification. The second connection portion 53 is located within the accommodating cavity 511 and is protected by the first connection portion 51 on its outer periphery, ensuring that the adapting impedance 57 is not affected by external environmental interference and improving its service life. Furthermore, when the resistor R fails, it is easy to replace; a new resistor R can simply be soldered on.

[0034] Of course, for easier disassembly and replacement, the second connecting part 53 can be movably connected to the first connecting part 51. When either the first connecting part 51 or the second connecting part 53 malfunctions, it can be replaced individually, thus saving costs. After the resistor R is damaged, the second connecting part 53 can be disassembled, the resistor R can be replaced individually, and then the second connecting part 53 can be inserted into the receiving cavity 511. The movable connection between the first connecting part 51 and the second connecting part 53 can be in various ways. For example, the insulating member 55 provided in the receiving cavity 511 has a flexible mounting hole 551 in the middle. The insulating member 55 is fixedly connected to the first connecting part 51, and one side of the second connecting part 53 is set in the shape of a pin, corresponding to and matching the mounting hole 551. One side of the second connecting part 53 can be freely inserted into the mounting hole 551 and is well fixed in position; when it needs to be removed, it can be pulled out by force. Of course, other plug-in, threaded, or snap-fit ​​structures can also be used, which are not limited here.

[0035] In this embodiment, the first connecting part 51 is generally cylindrical, with a BNC connector at one end. The first connecting part 51 serves both to connect and fix the signal source 1 and the outer conductor 21, and to cooperate with the second connecting part 53 for coaxial reverse current conduction. It simultaneously functions as both a connector and a conductor. Its cylindrical shape facilitates connection and installation, and allows for optimal compatibility with the second connecting part 53, reducing interference from the magnetic field generated by the high-frequency current signal on the frequency characteristic detection of the coaxial shunt 20. Furthermore, the BNC connector at one end of the first connecting part 51 facilitates electrical connection between the coaxial shunt frequency characteristic detection fixture 5 and the coaxial cable or various types of signal sources 1. Moreover, the BNC connector, by using the insulating member 55 to separate the inner and outer conductors 21, allows the second connecting part 53 to better adapt and connect with the first connecting part 51, and enables free assembly and disassembly.

[0036] In order to make an electrical connection with the coaxial shunt 20, one end of the second connection part 53 is provided with a connector 533 for electrically connecting the central shaft conductor 23 of the coaxial shunt 20; the first connection part 51 is provided with an abutment 513 and / or a limiting member 515, the abutment 513 and / or the limiting member 515 cooperate with the connector 533 for installing the coaxial shunt 20 and electrically connecting the outer conductor 21 of the coaxial shunt 20.

[0037] To facilitate use and installation, the coaxial shunt 20 typically has its central shaft conductor 23 extending through the outer conductor 21, and both the central shaft conductor 23 and the outer conductor 21 are coaxially arranged cylindrical or cylindrical structures. The connector 533 allows for a secure connection between the second connecting part 53 and the central shaft conductor 23. However, there may be gaps or gaps between the first connecting part 51 and the outer conductor 21. Therefore, the abutment member 513 and / or the limiting member 515 ensure a sufficient electrical connection between the first connecting part 51 and the outer conductor 21. The abutment member 513 and the limiting member 515 can be used individually or simultaneously; no further restrictions are imposed here.

[0038] It should be noted that the connection between the connector 533 and the central shaft conductor 23 can be a threaded connection, or a welding or snap-fit ​​connection. The connector 533, the abutment 513, and the limiting member 515 mentioned above are all made of conductive materials, used to connect and fix the coaxial shunt 20 while achieving electrical connection.

[0039] Please continue to refer to the following: Figure 8 , Figure 8This is a topology diagram of the coaxial shunt frequency characteristic detection device 100 provided by this utility model. The working principle of the coaxial shunt frequency characteristic detection device using the coaxial shunt frequency characteristic detection fixture is summarized as follows:

[0040] In the entire circuit connection, the signal source 1 is provided with a signal source impedance R1, the detection circuit 3 is provided with a detection impedance R2, the coaxial shunt frequency characteristic detection fixture 5 is provided with a resistor R, and the coaxial shunt 20 is provided with a resistor body impedance Rs.

[0041] The signal source 1 provides a high-frequency radio frequency voltage U1 at both ends. The coaxial shunt frequency characteristic detection fixture 5 and the coaxial shunt 20 together form a similar load structure. The high-frequency radio frequency current I flows through the coaxial shunt frequency characteristic detection fixture 5 and the coaxial shunt 20. The detection circuit 3 detects the voltage U2 across the resistor impedance Rs after the current is shunted by the coaxial shunt 20. Wherein, U1 / (R+Rs)=I, U2=I·Rs. The resistance value of the resistor impedance Rs is generally between 0.1 ohms and 0.001 ohms. The resistance values ​​of the signal source impedance R1, the detection impedance R2, and the resistor R are all 50 ohms, which is much larger than the resistance value of the resistor impedance Rs. Therefore, U2=U1·Rs / R.

[0042] Because the impedances of all structures in the entire detection system remain consistent, mutual matching is achieved. During the detection process, with the U2 and U1 detections being relatively accurate, the impedance Rs of the resistive element will not fluctuate, thus accurately reflecting the true frequency characteristics of the coaxial shunt 20.

[0043] Please continue to combine Figure 9 , Figure 9 The waveform diagram shows the frequency characteristics of the coaxial shunt detected using the coaxial shunt frequency characteristic detection device provided by this utility model. Further explanation of the frequency characteristics is as follows:

[0044] The waveform diagram showing the change in resistor impedance Rs with frequency f is displayed. Initially, the resistor impedance Rs remains constant. As the frequency f increases to the first frequency value f1, the resistor resistance Rs remains within ±3dB due to the presence of the adapter impedance 57. A significant change in Rs only occurs when the frequency f increases to the second frequency value f2, primarily due to high-frequency radio frequency signal leakage, which is related to manufacturing processes and mechanical structures. With the adapter impedance 57, the second frequency value f2 can essentially reach 2GHz, while the first frequency value f1 is typically 1GHz. The second frequency value f2 represents the true maximum operating frequency of the coaxial shunt 20. Because the adapter impedance 57 is included in the coaxial shunt frequency characteristic detection fixture 5, the coaxial shunt frequency characteristic detection device 100 can more effectively detect the frequency characteristics of the coaxial shunt 20.

[0045] The coaxial shunt frequency characteristic detection device 100 uses the coaxial shunt frequency characteristic detection fixture 5, which provides an effective detection environment for the detection of the coaxial shunt 20, reduces the influence of impedance mismatch on the detection results, and thus detects the accurate frequency characteristics of the coaxial shunt.

[0046] Furthermore, by providing the connector 533, the abutment 513, and the limiting member 515, the coaxial shunt frequency characteristic testing fixture 5 can achieve a tight fit between the coaxial shunt frequency characteristic testing fixture 5 and the coaxial shunt 20, thereby improving the stability of the test.

[0047] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A coaxial splitter frequency characteristic detection fixture for assisting a coaxial splitter to be connected with a signal source and a detection circuit, and detecting a frequency characteristic, characterized in that, Comprising: a first connecting part, which is internally provided with a containing cavity; and a second connecting part, which is accommodated in the containing cavity, the first connecting part and the second connecting part are coaxially arranged from outside to inside, and are both made of conductive material, the second connecting part cooperates with the first connecting part to install and fix the coaxial shunt and electrically connect with the coaxial shunt, the second connecting part is provided with an adaptive impedance corresponding to the signal source and the detection circuit.

2. The coaxial shunt frequency characteristic detection fixture of claim 1, wherein, The adaptive impedance has a resistance value of 50 ohms.

3. The coaxial shunt frequency characteristic detection fixture of claim 1, wherein, The second connecting part comprises a resistor for providing the adaptive impedance.

4. The coaxial shunt frequency characteristic detection fixture of claim 1, wherein, The second connecting part is movably connected to the first connecting part.

5. The coaxial shunt frequency characteristic detection fixture of claim 1, wherein, One end of the second connecting part is provided with a connecting head; the first connecting part is provided with an abutting piece and / or a limiting piece, the abutting piece and / or the limiting piece cooperates with the connecting head to install the coaxial shunt and electrically connect the outer conductor of the coaxial shunt.

6. The coaxial shunt frequency characteristic detection fixture of claim 1, wherein, The first connecting part is in a whole cylindrical structure, and is provided with a BNC joint at one end.

7. A coaxial shunt frequency characteristic detection device for detecting the frequency characteristic of a coaxial shunt, comprising: a signal source for generating high-frequency radio frequency voltage; a detection circuit for connecting the coaxial shunt and analyzing and detecting the voltage signal shunted by the coaxial shunt; and The coaxial shunt frequency characteristic detection fixture of any one of claims 1 to 6 is electrically connected with the signal source and the coaxial shunt respectively.

8. The coaxial shunt frequency characteristic detection device according to claim 7, characterized in that, Further comprising a coaxial cable, which is arranged between the detection circuit and the coaxial shunt.

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