High-frequency radio-frequency leakage prevention coaxial shunt and current detection system

Abstract

The utility model provides a coaxial shunt for preventing high-frequency radio frequency leakage, which comprises an outer conductor, a resistor body and a central shaft conductor, the central shaft conductor and the outer conductor are respectively provided with a central shaft conductor signal output end and an outer conductor signal output end, and a low-pass filtering module is arranged in a cylindrical structure of the resistor body. And the low-pass filtering module is electrically connected with the central shaft conductor signal output end and the outer conductor signal output end. According to the coaxial shunt capable of preventing high-frequency and radio-frequency leakage provided by the utility model, the low-pass filtering module is arranged between the signal output end of the central shaft conductor and the signal output end of the outer conductor, so that leaked high-frequency and radio-frequency signals can be filtered, and the detection bandwidth of the coaxial shunt capable of preventing high-frequency and radio-frequency leakage is effectively increased; and the space is saved. The utility model also provides a current detection system.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit detection technical field, especially relates to prevent high frequency radio frequency leakage coaxial shunt and current detection system. BACKGROUND

[0002] In the field of electronic measurement, it is often necessary to measure high frequency (100MHz or more) current waveform, in order to reduce the shunt parasitic inductance, the industry generally uses coaxial shunt to detect high frequency current. Figure 1 As shown in the prior art coaxial shunt. The coaxial shunt is provided with an outer conductor, a resistor body and a center axis conductor, so that the high frequency current flows through the center axis conductor, the resistor body and the outer conductor coaxially and reversely, and the magnetic field formed by the high frequency current on the center axis conductor and the outer conductor cancels each other out, thereby reducing the measurement of high frequency current.

[0003] However, the coaxial shunt of the prior art has the phenomenon of "signal leakage" when transmitting high frequency radio frequency signals during production and manufacturing due to the influence of production process and mechanical properties. The specific manifestation of this phenomenon is that the resistance Rs of the resistor body changes obviously.

[0004] Please refer to Figure 2 and Figure 3 , Figure 2 is the topology diagram of the prior art coaxial shunt in use, Figure 3 is the frequency characteristic waveform diagram of the prior art coaxial shunt test. The signal source provides an input signal U1, and the detection device detects the voltage signal U2 across the resistor body, and a voltage dividing impedance R is arranged between the signal source and the coaxial shunt. Wherein, U1 / (R+Rs)=I, U2=I·Rs. The resistance Rs of the resistor body impedance is generally between 0.1 ohm and 0.001 ohm, and the resistance R of the voltage dividing impedance is generally 50 ohm, which is much larger than the resistance Rs of the resistor body impedance, so U2=U1·Rs / R. Under normal circumstances, based on Ohm's law, the resistance Rs of the resistor body impedance remains unchanged, but as the frequency of the input signal U1 provided by the signal source increases, the signal leakage occurs, the input signal U1 is directly transmitted to the two ends of the detection circuit, resulting in the increase of the voltage signal U2 detected, but the resistance Rs of the resistor body impedance does not change.

[0005] Specifically, the input end of the coaxial shunt input high-frequency current signal frequency f increases from 0HZ, in the initial stage, due to the small frequency f, there is no leakage phenomenon, the coaxial shunt can be used normally, the resistance value Rs remains unchanged; when the frequency f reaches a certain value, the coaxial shunt detects the error, the detected signal corresponds to the calculation of the resistance value Rs starts to increase; when the resistance value Rs changes more than 3dB, the first frequency f1 of the frequency f is obtained, if the frequency continues to increase, the error is too large, the coaxial shunt cannot be used normally. Normally, the resistor is not damaged, the detected resistance value Rs should remain unchanged, and due to the existence of signal leakage phenomenon, the detection error occurs, and the resistance value Rs changes.

[0006] The prior art mainly improves the production process or improves the manufacturing material, but the improvement is limited, the bandwidth that can be detected by the coaxial shunt is still narrow, and it is difficult to use in high-frequency radio frequency circuit with frequency f exceeding 1GHZ.

Utility model content

[0007] The utility model provides a kind of for solving above-mentioned bandwidth narrow, error big problem of preventing high-frequency radio frequency leakage coaxial shunt and current detection system, to increase detection bandwidth, and improve the accuracy of detection result.

[0008] A kind of prevents high-frequency radio frequency leakage coaxial shunt, including outer conductor, resistance body and center axis conductor, the inside of the outer conductor is equipped with accommodating cavity;The resistance body is housed in the accommodating cavity;The outer conductor, the resistance body and the center axis conductor are all cylindrical structure, coaxially from outside to inside, the center axis conductor penetrates the outer conductor, and the resistance body both ends are electrically connected with the outer conductor and the center axis conductor;The center axis conductor and the outer conductor are equipped with center axis conductor signal output end and outer conductor signal output end respectively, low pass filter module is equipped between the center axis conductor signal output end and the outer conductor signal output end, for filtering high-frequency radio frequency signal.

[0009] The utility model provides a current detection system, including detection equipment and high frequency radio frequency leakage coaxial shunt ware, high frequency radio frequency leakage coaxial shunt ware includes outer conductor, resistance body and central shaft conductor, the inside of outer conductor is equipped with accommodation cavity, resistance body is accommodated in the accommodation cavity, the outer conductor, resistance body and central shaft conductor are all cylindrical structure, coaxial arrangement from outside to inside, central shaft conductor penetrates the outer conductor, and resistance body both ends are electrically connected with the outer conductor and central shaft conductor, central shaft conductor and outer conductor all are equipped with central shaft conductor signal output end and outer conductor signal output end, and low pass filter module is equipped between central shaft conductor signal output end and outer conductor signal output end for filtering high frequency radio frequency signal, detection equipment is electrically connected with the outer conductor and central shaft conductor for detecting the high frequency current signal flowing through the outer conductor, resistance body and central shaft conductor.

[0010] Compared with the prior art, the low pass filter module is arranged between the central shaft conductor signal output end and the outer conductor signal output end of the high frequency radio frequency leakage coaxial shunt ware, which can filter the leaked high frequency radio frequency signal, effectively increase the detection bandwidth of the high frequency radio frequency leakage coaxial shunt ware, that is, compared with the case where the low pass filter module is not arranged, in the high frequency radio frequency circuit where the frequency f is less than the first frequency f max , the resistance value Rs of the resistance body remains basically unchanged and does not fluctuate; in the high frequency radio frequency circuit where the frequency f is greater than the first frequency f max , the resistance value Rs of the resistance body also does not fluctuate too much, the detection accuracy of the high frequency radio frequency leakage coaxial shunt ware can be effectively improved, and the detection bandwidth is simultaneously increased, which can be used in a higher frequency high frequency radio frequency circuit. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor, wherein:

[0012] Figure 1 It is a sectional view of the coaxial shunt ware in the prior art;

[0013] Figure 2 It is a detection circuit connection topology diagram of the coaxial shunt ware in the prior art;

[0014] Figure 3This is a frequency response waveform diagram of the coaxial shunt tested in the prior art;

[0015] Figure 4 This is a structural block diagram of the current detection system provided by this utility model;

[0016] Figure 5 This is a cross-sectional view of the first embodiment of the anti-high frequency radio frequency leakage coaxial shunt provided by this utility model;

[0017] Figure 6 yes Figure 5 The topology diagram of the low-pass filter module is shown below;

[0018] Figure 7 This is a cross-sectional view of the second embodiment of the anti-high frequency radio frequency leakage coaxial shunt provided by this utility model;

[0019] Figure 8 yes Figure 7 The low-pass filter module topology diagram shown is shown below;

[0020] Figure 9 This is a topology diagram of the low-pass filter module shown in the third embodiment of the anti-high frequency radio frequency leakage coaxial shunt provided by this utility model;

[0021] Figure 10 This is a topology diagram of the low-pass filter module shown in the fourth embodiment of the anti-high frequency radio frequency leakage coaxial shunt provided by this utility model;

[0022] Figure 11 This is a topology diagram of the low-pass filter module shown in the fifth embodiment of the anti-high frequency radio frequency leakage coaxial shunt provided by this utility model;

[0023] Figure 12 This is a topology diagram of the low-pass filter module shown in the sixth embodiment of the anti-high frequency radio frequency leakage coaxial shunt provided by this utility model;

[0024] Figure 13 This is a frequency response waveform diagram of the low-pass filter module provided by this utility model; and

[0025] Figure 14 This is a waveform diagram showing the frequency characteristics of the anti-high frequency radio frequency leakage coaxial shunt provided by this utility model.

Detailed Implementation Methods

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0028] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0029] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0031] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 is a structural block diagram of the current detection system 100 provided by the present application, Figure 5 is a sectional view of the first embodiment of the high-frequency radio frequency leakage prevention coaxial shunt 10 provided by the present application, Figure 6 is Figure 5The low-pass filter module 7 is shown in the topological graph. The current detection system 100 comprises a detection device 30 and a high-frequency radio frequency leakage prevention coaxial shunt 10. It should be noted that the specific circuit structure of the detection device 30 is not limited herein. The detection device 30 and the high-frequency radio frequency leakage prevention coaxial shunt 10 cooperate with each other and can be used in a high-frequency radio frequency circuit to achieve accurate detection of a high-frequency radio frequency current signal.

[0032] The high-frequency radio frequency leakage prevention coaxial shunt 10 comprises an outer conductor 1, a resistor body 3, and a center axis conductor 5. The outer conductor 1 is internally provided with a receiving cavity 101, and the resistor body 3 is received in the receiving cavity 101. The outer conductor 1, the resistor body 3, and the center axis conductor 5 are all cylindrical structures and are coaxially arranged from outside to inside. The center axis conductor 5 penetrates the outer conductor 1, and the resistor body 3 is electrically connected to the outer conductor 1 and the center axis conductor 5 at both ends.

[0033] The center axis conductor 5 and the outer conductor 1 are divided into a center axis conductor signal input end 501, an outer conductor signal input end 11, a center axis conductor signal output end 53, and an outer conductor signal output end 13 on both sides of the resistor body 3. A high-frequency radio frequency signal source I is connected to the center axis conductor signal input end 501 and the outer conductor signal input end 11. The resistor body 3 is internally provided with a low-pass filter module 7, which is electrically connected to the center axis conductor signal output end 503 and the outer conductor signal output end 13 and is used for filtering a high-frequency radio frequency signal. The detection device 30 is electrically connected to the outer conductor 1 and the center axis conductor 5 and is used for detecting the high-frequency current signal I flowing through the outer conductor 1, the resistor body 3, and the center axis conductor 5. The detection device 30 is mainly connected to the center axis conductor signal output end 503 and the outer conductor signal output end 13. Due to the presence of the low-pass filter module 7, the detection error of the detection device 30 can be effectively reduced.

[0034] In this embodiment, the resistor body 3 and the center axis conductor 5 are arranged in the receiving cavity 101 formed by the outer conductor 1. Since the resistor body 3 is also a hollow cylindrical structure, the low-pass filter module 7 is arranged in the resistor body 3 and is close to one side of the center axis conductor signal output end 503 and the outer conductor signal output end 13. This arrangement not only facilitates the connection of the low-pass filter module 7 to the center axis conductor 5 and the outer conductor 1, but also saves space. Without increasing the volume of the high-frequency radio frequency leakage prevention coaxial shunt 10, the low-pass filter module 7 is arranged outside the high-frequency radio frequency leakage prevention coaxial shunt 10.

[0035] In addition, due to different frequency characteristics of the high-frequency radio frequency leakage prevention coaxial shunt 10, the signal leakage problem is different, and a unified low-pass filter module 7 cannot be produced for connection and adaptation. The low-pass filter module 7 is set according to the specific situation, and is installed in the accommodating cavity 101 in advance, so that the user does not need to install and select, and does not need to purchase precise debugging instruments for adjustment, and use is more convenient and less prone to errors. The low-pass filter module 7 is integrally arranged with the outer conductor 1, the resistance body 3 and the center axis conductor 5, and the frequency characteristics of the high-frequency radio frequency leakage prevention coaxial shunt 10 are precisely adjusted without changing the overall structure length or volume.

[0036] In order to filter the leaked high-frequency radio frequency signal, the low-pass filter module 7 can be a passive first-order low-pass filter, a second-order low-pass filter or a third-order low-pass filter, which can be selected according to specific needs. In this embodiment, a first-order low-pass filter is selected, which is simple in structure, easy to set and low in cost. Of course, in another embodiment, a second-order low-pass filter, a third-order low-pass filter or other multi-order low-pass filter can also be selected.

[0037] The low-pass filter module 7 comprises a first capacitor C1, and two ends of the first capacitor C1 are respectively electrically connected with the center axis conductor signal output end 503 and the outer conductor signal output end 13. By arranging the first capacitor C1, the leaked high-frequency radio frequency signal can be effectively filtered, and the corresponding principle is introduced as follows:

[0038] Since the outer conductor 1 is grounded, the first capacitor C1 is equivalent to the first end point A being grounded, and the other end point B is connected with the center axis conductor 5. The current signal normally flowing through the center axis conductor 5 will not be affected by the first capacitor C1. When the leaked high-frequency radio frequency signal flows into the center axis conductor signal output end 503, the first capacitor C1 has the characteristic of “passing alternating current”, and will transmit the leaked high-frequency radio frequency signal to the outer conductor 1, that is, to the ground, and will not affect the detection result of the detection equipment 30.

[0039] In addition, the low-pass filter module 7 adopts a scheme of a single first capacitor C1, and the overall circuit structure is simple, easy to produce and process, and low in cost.

[0040] Please continue to refer to Figure 7 and Figure 8 , Figure 7 is a sectional view of the second embodiment of the high-frequency radio frequency leakage prevention coaxial shunt 10 provided by the utility model, Figure 8 is Figure 7The low-pass filter module 7 topology shown. The center conductor 5 includes a first rod 51 and a second rod 53, the first rod 51 through the outer conductor 1 and the resistor 3, and is electrically connected with the outer conductor 1 and the resistor 3, the second rod 53 coaxially arranged relative to the first rod 51. In this embodiment, the center conductor 5 is divided into two parts, the low-pass filter module 7 is electrically connected with the first rod 51, the second rod 53 and the outer conductor 1 respectively. The center conductor 5 is divided into two parts, which can enrich the setting mode of the low-pass filter module 7, and the selection is more diverse. At the same time, it is more convenient for the production and installation of the center conductor 5 and the low-pass filter module 7, and when the low-pass filter module 7 needs to be replaced and adjusted, the first rod 51 and the second rod 53 can be separated and reset separately, which is more convenient.

[0041] In order to further strengthen the filtering processing of the leaked high-frequency radio frequency signal, the low-pass filter module 7 selects a second-order low-pass filter structure, including an inductor L and a second capacitor C2. The inductor L is arranged between the first rod 51 and the second rod 53, one end of the second capacitor C2 is electrically connected with the outer conductor 1, and the other end of the second capacitor C2 is arranged between the inductor L and the second rod 53. Among them, the end point C and the end point D of the inductor L are connected with the first rod 51 and the second rod 53 respectively, the end point E of the second capacitor C2 is connected with the outer conductor 1, which is equivalent to ground, and the end point F of the second capacitor C2 is connected with the end point D.

[0042] Compared with the first embodiment, the difference of the second embodiment is that the inductor L is arranged on the output end of the center conductor 5, and the inductor L is arranged on the output end of the center conductor 5. The characteristic of "blocking alternating current" is used to cooperate with the second capacitor C2 to realize step-by-step processing of the leaked high-frequency radio frequency signal, and further avoid the influence on the detection result of the detection equipment 30. The connection mode of the inductor L and the second capacitor C2 is relatively simple as a whole, and the center conductor 5 is divided into the first rod 51 and the second rod 53, which is convenient to install, and can effectively process the leaked high-frequency radio frequency signal.

[0043] Please continue to refer to Figure 9 , Figure 9 The low-pass filter module 7 topology shown in the third embodiment of the high-frequency radio frequency leakage prevention coaxial shunt provided by the utility model. The difference between the third embodiment and the second embodiment is that the inductor L is replaced by a resistor R1, which is used to cooperate with the second capacitor C2 to realize step-by-step processing of the leaked high-frequency radio frequency signal, and further avoid the influence on the detection result of the detection equipment 30.

[0044] Please continue to refer toFigure 10 and Figure 11 , respectively, are the low-pass filter module 7 topology shown in the fourth and fifth embodiments of the anti-high-frequency radio frequency leakage coaxial shunt 10 provided by the utility model. In the fourth and fifth embodiments, two or more low-pass filter modules 7 are arranged between the first rod 51, the second rod 53 and the outer conductor 1, each inductance L or resistance R1 is connected in series between the first rod 51 and the second rod 53, the second capacitance C2 corresponds to the number of inductance L or resistance R1, and each second capacitance C2 is connected in parallel between the inductance L or resistance R1 and the outer conductor 1 with respect to the inductance L or resistance R1. By arranging multiple layers of low-pass filters, the leaked high-frequency radio frequency signals can be processed more efficiently, further reducing errors, thereby increasing the detection bandwidth of the anti-high-frequency radio frequency leakage coaxial shunt 10.

[0045] Please continue to refer to Figure 12 , Figure 12 is the low-pass filter module 7 topology shown in the sixth embodiment of the anti-high-frequency radio frequency leakage coaxial shunt 10 provided by the utility model. The low-pass filter module 7 includes a low-pass filter chip, preferably an LFCN-1200+ low-pass filter chip. The endpoints G, H, K of the low-pass filter module 7 are connected to the first rod 51, the second rod 53 and the outer conductor 1, respectively. By directly selecting the existing low-pass filter chip, it can be directly set in the accommodating cavity 101, without the need for additional inductance L and second capacitance C2, and the connection is more convenient and has high integration.

[0046] Please combine Figure 13 and Figure 14 , Figure 13 is the frequency characteristic waveform diagram of the low-pass filter module 7 provided by the utility model, Figure 14 is the frequency characteristic waveform diagram of the anti-high-frequency radio frequency leakage coaxial shunt 10 provided by the utility model. When the low-pass filter module 7 is connected in the anti-high-frequency radio frequency leakage coaxial shunt 10, the gain G changes with the frequency f, showing a certain rule. In the initial stage, the gain G remains unchanged and remains within ±3dB; as the frequency f continues to increase to the first frequency f1, the gain G starts to drop more than 3dB.

[0047] During operation of the current detection system 100 using the high-frequency radio frequency leakage prevention coaxial shunt 10, due to the presence of the low-pass filter module 7, the resistance value Rs detection result will be directly affected by the change waveform of the frequency f. In the initial stage, the resistance value Rs remains unchanged, and due to the presence of the low-pass filter module 7, the resistance value Rs will not fluctuate and will remain within the range of ±3dB. As the frequency f continues to increase to the first frequency f1, the low-pass filter module 7 filters out the leaked high-frequency radio frequency signal, so that the resistance value Rs remains within the range of ±3dB. Since the filtering capability of the low-pass filter module 7 has a certain limit, until the frequency f increases to the second frequency f2, the resistance value Rs will change significantly. Through the use of the low-pass filter module 7, the second frequency f2 can basically reach 2GHz, and the first frequency f1 is generally 1GHz. The low-pass filter module 7 provided by the high-frequency radio frequency leakage prevention coaxial shunt 10 significantly increases the detection bandwidth, and can be used for high-frequency radio frequency circuits with frequencies between the first frequency f1 and the second frequency f2, has a wider application range, and improves the detection accuracy of the high-frequency radio frequency leakage prevention coaxial shunt 10.

[0048] Compared with the prior art, the high-frequency radio frequency leakage prevention coaxial shunt 10 provided by the utility model effectively increases the bandwidth without additional length or volume, is simple, small and easy to use. By integrally arranging the low-pass filter module 7, the user's preparation work is saved, and there is no need to additionally adjust the frequency characteristics of the high-frequency radio frequency leakage prevention coaxial shunt 10. If the low-pass filter module 7 is externally arranged, it is not only inconvenient for customers to install and use, but also increases the volume. At the same time, since the high-frequency radio frequency leakage prevention coaxial shunt 10 and the low-pass filter module 7 are one-to-one corresponding, they must be carefully paired during production and use and cannot be mixed, and ordinary users are difficult to adjust and need to be handled with precision instruments, which is prone to errors. Therefore, the high-frequency radio frequency leakage prevention coaxial shunt 10 greatly reduces the operation difficulty of the user and is more convenient to use.

[0049] The above-described embodiments are merely illustrative of the present application, and it should be noted that those skilled in the art can make improvements without departing from the inventive concept, and these improvements are within the scope of protection of the present application.

Claims

1. A coaxial shunt for preventing high-frequency radio frequency leakage, comprising: an outer conductor, an inner part of the outer conductor being provided with a receiving cavity; a resistor body, the resistor body being received in the receiving cavity; and a center axis conductor, the outer conductor, the resistor body and the center axis conductor all being cylindrical structures, coaxially arranged from outside to inside, the center axis conductor penetrating the outer conductor, and the resistor body being electrically connected with the outer conductor and the center axis conductor at two ends thereof respectively; characterized in that the center axis conductor and the outer conductor are respectively provided with a center axis conductor signal output end and an outer conductor signal output end, a low-pass filter module is arranged in the cylindrical structure of the resistor body, and the low-pass filter module is electrically connected with the center axis conductor signal output end and the outer conductor signal output end. The low-pass filter module is a passive first-order low-pass filter, a second-order low-pass filter or a third-order low-pass filter.

2. The high frequency radio frequency leakage resistant coaxial tap of claim 1, wherein, The low-pass filter module comprises a first capacitor, and the first capacitor is electrically connected with the center axis conductor signal output end and the outer conductor signal output end at two ends thereof respectively.

3. The high frequency radio leakage resistant coaxial tap of claim 2, wherein, The center axis conductor comprises:

4. The high frequency radio leakage resistant coaxial tap of claim 2, wherein, a first rod, the first rod penetrating the outer conductor and the resistor body and being electrically connected with the outer conductor and the resistor body; and a second rod, the second rod being coaxially arranged relative to the first rod. The low-pass filter module is electrically connected with the first rod, the second rod and the outer conductor respectively.

5. The high frequency radio leakage resistant coaxial tap of claim 4, wherein, The low-pass filter module comprises:

6. The high frequency radio leakage resistant coaxial tap of claim 5, wherein, an inductor or a resistor, the inductor or the resistor being arranged between the first rod and the second rod; and a second capacitor, one end of the second capacitor being electrically connected with the outer conductor, and the other end of the second capacitor being arranged between the inductor or the resistor and the second rod. Two or more of the inductors or the resistors and the second capacitors are arranged between the first rod, the second rod and the outer conductor, each of the inductors or the resistors is connected in series between the first rod and the second rod, the number of the second capacitors corresponds to the number of the inductors, and each of the second capacitors is connected in parallel between the inductor and the outer conductor relative to the inductor.

7. The high frequency radio leakage resistant coaxial tap of claim 6, wherein, The low-pass filter module comprises a low-pass filter chip, and the low-pass filter chip is selected from LFCN-1200+.

8. The high frequency radio leakage resistant coaxial tap of claim 5, wherein, comprising:

9. A current sensing system, characterized by, a detection device; and the coaxial shunt for preventing high-frequency radio frequency leakage according to any one of claims 1 to 8, the detection device being electrically connected with the outer conductor and the center axis conductor, and being used for detecting a high-frequency current signal flowing through the outer conductor, the resistor body and the center axis conductor. ​ ​

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