Electric field detection device and near-field scanning system

Abstract

The utility model provides an electric field detection device and a near field scanning system, the electric field detection device comprises a dipole, the dipole comprises a first branch knot and a second branch knot, the first branch knot and the second branch knot are arranged along a first direction, and the first branch knot and the second branch knot are used for coupling a first electric field arranged along the first direction and generating a first differential mode current; the shielding metal and the dipole are adjacently arranged in the second direction, at least part of the gap is overlapped with the projection of the shielding metal in the second direction, and the shielding metal is used for shielding a magnetic field in the second direction so as to suppress a second differential mode current generated by coupling of the first branch knot and the second branch knot with the magnetic field. According to the electric field detection device and the near field scanning system, the shielding metal can reduce or even completely block the magnetic field component penetrating through the gap, so that the second differential mode current generated by the first branch knot and the second branch knot is effectively inhibited, the interference of the magnetic field on the detection of the first electric field is reduced, and the detection precision of the electric field detection device is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric field detection, and in particular, to an electric field detection device and a near-field scanning system. Background Art

[0002] With the rapid development of communication technologies, the integration level of circuits is getting higher and higher, the internal clock frequency and conversion rate are getting faster and faster, and the resulting electromagnetic interference (EMI) problems are becoming more and more serious.

[0003] Among them, detecting the electric field in the corresponding area is a very important step in electromagnetic interference rectification. However, the detection of the electric field is easily interfered by the magnetic field, resulting in low detection accuracy and difficult to meet the use requirements of the near-field scanning system. Summary of the Invention

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to some extent.

[0005] To this end, an object of the present disclosure is to provide an electric field detection device and a near-field scanning system.

[0006] To achieve the above object, a first aspect of the present disclosure provides an electric field detection device, including: a dipole, the dipole includes: a first branch and a second branch, the first branch and the second branch are arranged along a first direction, and there is a gap between the first branch and the second branch, the first branch and the second branch are used for coupling a first electric field arranged along the first direction and generating a first differential-mode current; a shielding metal, the shielding metal and the dipole are arranged adjacent to each other along a second direction, and at least a part of the gap and the projection of the shielding metal along the second direction overlap, the shielding metal is used for shielding the magnetic field along the second direction to suppress a second differential-mode current generated by the coupling of the first branch and the second branch with the magnetic field; wherein, the first direction and the second direction form a first preset angle.

[0007] Optionally, the shielding metal includes: a first metal sheet, the first metal sheet is arranged on one side of the dipole, and at least a part of the gap and the projection of the first metal sheet along the second direction overlap, the first metal sheet is used for shielding the magnetic field along the second direction.

[0008] Optionally, the shielding metal further includes: a second metal sheet, the second metal sheet is arranged on the side of the dipole away from the first metal sheet, and at least a part of the gap and the projection of the second metal sheet along the second direction overlap, the second metal sheet is used for shielding the magnetic field along the second direction.

[0009] Optionally, all of the slit and the projection of the first metal sheet along the second direction overlap; and / or, all of the slit and the projection of the second metal sheet along the second direction overlap.

[0010] Optionally, the dipole further includes: a third branch, the third branch is disposed at an end of the first branch away from the second branch, and at least one end of the third branch extends in a direction close to the shielding metal after being bent; and / or, a fourth branch, the fourth branch is disposed at an end of the second branch away from the first branch, and at least one end of the fourth branch extends in a direction close to the shielding metal after being bent.

[0011] Optionally, the electric field detection device further includes: a processing module, an input end of the processing module is respectively connected to the first branch and the second branch, and the processing module is configured to obtain a relative value or an absolute value of the first electric field according to the first differential-mode current.

[0012] Optionally, the electric field detection device further includes: a metal ground, the metal ground is disposed adjacent to the dipole, and the shielding metal is disposed at an end of the metal ground close to the dipole.

[0013] Optionally, the electric field detection device further includes: a transmission line, the transmission line includes: a first wire and a second wire, the first wire and the second wire are disposed adjacent to each other along the first direction, and the first wire and the second wire are respectively arranged along the third direction, one end of the first wire is connected to an end of the first branch close to the second branch, one end of the second wire is connected to an end of the second branch close to the first branch, and the first wire and the second wire are configured to transmit the first differential-mode current; wherein, the metal ground is disposed adjacent to the transmission line, and the metal ground is located around the first wire and the second wire, the first direction and the third direction form a second preset angle, and the second direction and the third direction form a third preset angle.

[0014] Optionally, the electric field detection device further includes: a balun, a first input end of the balun is connected to an end of the first wire away from the first branch, a second input end of the balun is connected to an end of the second wire away from the second branch, and an output end of the balun outputs the first differential-mode current; wherein, the balun is configured to suppress a common-mode current generated by coupling of the first branch and the second branch with a second electric field, and the second electric field is arranged along the third direction.

[0015] Optionally, the electric field detection device further includes: a first connector, an input end of the first connector is respectively connected to one end of the first wire far from the first branch and one end of the second wire far from the second branch, a ground end of the first connector is connected to the metal ground, and an output end of the first connector is used for snap - connection with an input end of a second connector.

[0016] Optionally, the electric field detection device further includes: an insulating connector, the insulating connector is disposed on the metal ground, and the dipole is disposed on the insulating connector.

[0017] A second aspect of the present disclosure provides a near - field scanning system, including: the electric field detection device provided in the first aspect of the present disclosure.

[0018] The technical solutions provided by the present disclosure may include the following beneficial effects:

[0019] Since the shielding metal and the dipole are adjacent to each other in the second direction, and at least a part of the gap overlaps with the projection of the shielding metal in the second direction, the shielding metal can reduce or even completely block the magnetic field component passing through the gap, thereby effectively suppressing the second differential - mode current generated in the first branch and the second branch, further reducing the interference of the magnetic field on the first electric field detection, improving the detection accuracy of the electric field detection device, and thus meeting the usage requirements of the near - field scanning system.

[0020] The additional aspects and advantages of the present disclosure will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present disclosure. Description of the Drawings

[0021] The above - mentioned and / or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0022] Figure 1 is a partial structural schematic diagram of an electric field detection device proposed in an embodiment of the present disclosure;

[0023] Figure 2 is a structural schematic diagram of a transmission line in an electric field detection device proposed in an embodiment of the present disclosure;

[0024] Figure 3 is a structural schematic diagram of a verification system proposed in an embodiment of the present disclosure;

[0025] Figure 4 is a comparison diagram of test results proposed in an embodiment of the present disclosure;

[0026] Figure 5 is a comparison diagram of test results proposed in an embodiment of the present disclosure;

[0027] As shown in the figure: 1. Dipole, 11. First stub, 12. Second stub, 13. Slot, 14. Third stub, 15. Fourth stub;

[0028] 2. Shielding metal, 21. First metal sheet, 22. Second metal sheet;

[0029] 3. Processing module, 4. Metal ground;

[0030] 5. Transmission line, 51. First conductor, 52. Second conductor;

[0031] 6. Balanced - to - unbalanced impedance converter, 7. First connector, 8. Second connector, 9. Insulating connector;

[0032] 100. First electric - field detection device, 200. Second electric - field detection device, 300. First microstrip line, 400. Second microstrip line. Detailed implementation mode

[0033] The embodiments of the present disclosure will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present disclosure and should not be construed as a limitation of the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0034] With the rapid development of communication technology, the integration degree of circuits is getting higher and higher, the internal clock frequency and conversion rate are getting faster and faster, and the resulting electromagnetic interference (EMI) problems are becoming more and more serious. Specifically, at low frequencies, the sizes of components such as the structure and package of the circuit are very small compared to the wavelength and cannot effectively radiate electromagnetic fields. However, in high - speed and high - frequency systems, their sizes can be comparable to the harmonic wavelengths of the clock frequency, becoming unexpected antennas, resulting in frequent occurrence of EMI problems. Electromagnetic interference can be directly conducted to the circuit board through signal pins or power pins, or can be coupled through the radiated electric or magnetic fields.

[0035] Among them, detecting the electric field in the corresponding area is a very important step in electromagnetic interference rectification. However, the detection of the electric field is easily interfered by the magnetic field. For example, the tangential electric field and the tangential magnetic field both generate differential - mode currents in the electric - field detection device. Since the generated current modes are the same, the tangential magnetic field interferes with the detection of the tangential electric field, resulting in a low detection accuracy of the electric - field detection device and making it difficult to meet the usage requirements of the near - field scanning system.

[0036] To solve the above - mentioned technical problems, as Figure 1As shown in the figure, an electric field detection device is proposed in an embodiment of the present disclosure, including: a dipole 1 and a shielding metal 2. The dipole 1 includes: a first branch 11 and a second branch 12. The first branch 11 and the second branch 12 are arranged along a first direction, and a gap 13 is provided between the first branch 11 and the second branch 12. The first branch 11 and the second branch 12 are used to couple a first electric field arranged along the first direction and generate a first differential-mode current. The shielding metal 2 and the dipole 1 are arranged adjacent to each other along a second direction, and at least a part of the gap 13 overlaps with the projection of the shielding metal 2 along the second direction. The shielding metal 2 is used to shield the magnetic field along the second direction to suppress the second differential-mode current generated by the coupling of the first branch 11 and the second branch 12 with the magnetic field, where the first direction and the second direction form a first preset angle.

[0037] It can be understood that since the first branch 11 and the second branch 12 are arranged along the first direction, and a gap 13 is provided between the first branch 11 and the second branch 12, when the first branch 11 and the second branch 12 are placed in the first electric field arranged along the first direction, the gap 13 can be used to couple with the first electric field, thereby generating a first differential-mode current. Furthermore, the first electric field can be detected by using the first differential-mode current. At the same time, when the first branch 11 and the second branch 12 are placed in the magnetic field arranged along the second direction, the gap 13 can be used to couple with the magnetic field, thereby generating a second differential-mode current. And since the second differential-mode current has the same mode as the first differential-mode current, the magnetic field interferes with the detection of the first electric field.

[0038] Since the shielding metal 2 and the dipole 1 are arranged adjacent to each other along the second direction, and at least a part of the gap 13 overlaps with the projection of the shielding metal 2 along the second direction, the shielding metal 2 can reduce or even completely block the magnetic field component passing through the gap 13, thereby effectively suppressing the second differential-mode current generated by the first branch 11 and the second branch 12. Furthermore, the interference of the magnetic field on the detection of the first electric field is reduced, and the detection accuracy of the electric field detection device is improved, thus meeting the use requirements of the near-field scanning system.

[0039] It should be noted that the first branch 11 and the second branch 12 of the dipole 1 are coupled through the gap 13. When the dipole 1 is placed in the first electric field and the magnetic field, the coupling between the first branch 11 and the second branch 12 will change under the action of the first electric field and the magnetic field, thereby generating a first differential-mode current and a second differential-mode current. By shielding the magnetic field with the shielding metal 2, the second differential-mode current is suppressed, so that the electric field detection device can accurately detect the first electric field by using the first differential-mode current. At the same time, since the dipole 1 and the shielding metal 2 are not connected and belong to different electrical networks, the influence of the shielding metal 2 on the dipole 1 is avoided, and thus the stable detection of the first electric field by the electric field detection device is ensured.

[0040] The first branch 11 and the second branch 12 serve as the main body parts of the dipole 1, which are used to couple the first electric field arranged along the second direction to generate a first differential-mode current. The specific types of the first branch 11 and the second branch 12 can be set according to actual needs, and there is no limitation in this regard. By way of example, the first branch 11 and the second branch 12 are respectively strip-shaped metal branch structures. Among them, the first branch 11 and the second branch 12 being arranged along the first direction means that the length directions of the first branch 11 and the second branch 12 are respectively located in the first direction, and the central axes of the first branch 11 and the second branch 12 coincide.

[0041] The gap 13 between the first branch 11 and the second branch 12 is used for the coupling between the first branch 11 and the second branch 12, as well as the coupling between the first branch 11 and the second branch 12 and the first electric field and magnetic field. The width of the gap 13 can be set according to actual needs, and there is no limitation in this regard.

[0042] The shielding metal 2 is used to shield the magnetic field arranged along the second direction. The specific type of the shielding metal 2 can be set according to actual needs, and there is no limitation in this regard.

[0043] Both the first differential-mode current and the second differential-mode current are differential-mode currents. A differential-mode current refers to the current transmitted through two relatively independent conductors or paths of a circuit (usually the two wires of a signal pair). These currents have equal but opposite magnitudes between the two conductors, and they carry differential signals and can be used for data transmission and signal processing.

[0044] The first direction and the second direction can be set according to actual needs, and there is no limitation in this regard. By way of example, the first preset angle can be 90 degrees. The first direction and the second direction are perpendicular to each other and both belong to the tangential direction of the electric field detection device, that is, the first electric field is a tangential electric field and the magnetic field is a tangential magnetic field.

[0045] The application scenarios of the electric field detection device can be set according to actual needs, and there is no limitation in this regard. By way of example, the electric field detection device can be applied to any detection facilities such as scanners and electric field probes, and it can improve the detection accuracy in the electromagnetic interference analysis of devices such as printed circuit boards, packages, and chips.

[0046] As Figure 1 shown, in some embodiments, the shielding metal 2 includes: a first metal sheet 21. The first metal sheet 21 is arranged on one side of the dipole 1, and at least part of the gap 13 and the projection of the first metal sheet 21 along the second direction overlap. The first metal sheet 21 is used to shield the magnetic field along the second direction.

[0047] It can be understood that since the first metal sheet 21 is disposed on one side of the dipole 1 and at least a part of the slit 13 and the projection of the first metal sheet 21 along the second direction overlap, the first metal sheet 21 can reduce or even completely block the magnetic field component passing through the slit 13, thereby effectively suppressing the generation of the second differential-mode current in the first branch 11 and the second branch 12, further reducing the interference of the magnetic field on the first electric field detection, improving the detection accuracy of the electric field detection device, and thus meeting the usage requirements of the near-field scanning system.

[0048] It should be noted that the first metal sheet 21 is used to shield the magnetic field arranged along the second direction. The specific type of the first metal sheet 21 can be set according to actual needs, and there is no limitation in this regard. By way of example, the first metal sheet 21 is a square metal sheet. The first metal sheet 21 is parallel to the first direction and perpendicular to the second direction. That is to say, the magnetic field in the second direction can be regarded as the normal magnetic field of the first metal sheet 21.

[0049] As Figure 1 shown, in some embodiments, the shielding metal 2 further includes: a second metal sheet 22. The second metal sheet 22 is disposed on the side of the dipole 1 away from the first metal sheet 21, and at least a part of the slit 13 and the projection of the second metal sheet 22 along the second direction overlap. The second metal sheet 22 is used to shield the magnetic field arranged along the second direction.

[0050] It can be understood that since the second metal sheet 22 is disposed on the side of the dipole 1 away from the first metal sheet 21 and at least a part of the slit 13 and the projection of the second metal sheet 22 along the second direction overlap, the second metal sheet 22 cooperating with the first metal sheet 21 can greatly reduce or even completely block the magnetic field component passing through the slit 13, thereby effectively suppressing the generation of the second differential-mode current in the first branch 11 and the second branch 12, further reducing the interference of the magnetic field on the first electric field detection, improving the detection accuracy of the electric field detection device, and thus meeting the usage requirements of the near-field scanning system.

[0051] It should be noted that the second metal sheet 22 is used to shield the magnetic field arranged along the second direction. The specific type of the second metal sheet 22 can be set according to actual needs, and there is no limitation in this regard. By way of example, the second metal sheet 22 is a square metal sheet. The second metal sheet 22 is parallel to the first direction and perpendicular to the second direction. That is to say, the magnetic field in the second direction can be regarded as the normal magnetic field of the second metal sheet 22.

[0052] Wherein, the first metal sheet 21 and the second metal sheet 22 are respectively located on both sides of the slit 13, so as to achieve efficient shielding of the magnetic field arranged along the second direction. The first metal sheet 21 and / or the second metal sheet 22 can partially or completely block the slit 13 in the second direction, and there is no limitation in this regard.

[0053] As Figure 1As shown, in some embodiments, the entire slit 13 and the projection of the first metal sheet 21 along the second direction overlap; and / or, the entire slit 13 and the projection of the second metal sheet 22 along the second direction overlap.

[0054] It can be understood that since the entire slit 13 and the projection of the first metal sheet 21 along the second direction overlap, the first metal sheet 21 can completely block the slit 13 in the second direction, thereby achieving efficient shielding of the magnetic field in the second direction, further reducing the interference of the magnetic field on the first electric field detection, and improving the detection accuracy of the electric field detection device.

[0055] Since the entire slit 13 and the projection of the second metal sheet 22 along the second direction overlap, the second metal sheet 22 can completely block the slit 13 in the second direction, thereby achieving efficient shielding of the magnetic field in the second direction, further reducing the interference of the magnetic field on the first electric field detection, and improving the detection accuracy of the electric field detection device.

[0056] It should be noted that it is possible to only set the overlap between the entire slit 13 and the projection of the first metal sheet 21 along the second direction, or only set the overlap between the entire slit 13 and the projection of the second metal sheet 22 along the second direction, or it is also possible to simultaneously set the overlap between the entire slit 13 and the projection of the first metal sheet 21 along the second direction, as well as the overlap between the entire slit 13 and the projection of the second metal sheet 22 along the second direction, and there is no limitation on this.

[0057] As Figure 1 As shown, in some embodiments, the dipole 1 further includes: a third branch 14 and / or a fourth branch 15. The third branch 14 is disposed at one end of the first branch 11 away from the second branch 12, and at least one end of the third branch 14 extends in a direction close to the shielding metal 2 after being bent. The fourth branch 15 is disposed at one end of the second branch 12 away from the first branch 11, and at least one end of the fourth branch 15 extends in a direction close to the shielding metal 2 after being bent.

[0058] It can be understood that since the third branch 14 is disposed at one end of the first branch 11 away from the second branch 12, and at least one end of the third branch 14 extends in a direction close to the shielding metal 2 after being bent, the first branch 11 can use the third branch 14 to increase its length, thereby effectively enhancing the coupling ability of the first branch 11, and further improving the sensitivity of the electric field detection device to the first electric field detection.

[0059] Since the fourth branch 15 is disposed at one end of the second branch 12 away from the first branch 11, and at least one end of the fourth branch 15 extends in a direction close to the shielding metal 2 after being bent, the second branch 12 can use the fourth branch 15 to increase its length, thereby effectively enhancing the coupling ability of the second branch 12, and further improving the sensitivity of the electric field detection device to the first electric field detection.

[0060] It should be noted that the longer the length of the stub, the easier it is to couple with a weaker electric field, and the stronger the coupling ability. On the contrary, the shorter the length of the stub, the less likely it is to couple with a weaker electric field, and the weaker the coupling ability.

[0061] The third stub 14 is used to extend the first stub 11. The specific type of the third stub 14 can be set according to actual needs, and there is no limitation in this regard. For example, the third stub 14 is a metal structure close to a U shape. The middle part of the third stub 14 is connected to one end of the first stub 11 far from the second stub 12, and both ends of the third stub 14 extend along the direction close to the first metal sheet 21 and the direction close to the second metal sheet 22 respectively.

[0062] The fourth stub 15 is used to extend the second stub 12. The specific type of the fourth stub 15 can be set according to actual needs, and there is no limitation in this regard. For example, the fourth stub 15 is a metal structure close to a U shape. The middle part of the fourth stub 15 is connected to one end of the second stub 12 far from the first stub 11, and both ends of the fourth stub 15 extend along the direction close to the first metal sheet 21 and the direction close to the second metal sheet 22 respectively.

[0063] Wherein, the first metal sheet 21 is arranged at intervals between the first end of the third stub 14 and the first end of the fourth stub 15, and the second metal sheet 22 is arranged at intervals between the second end of the third stub 14 and the second end of the fourth stub 15. The third stub 14, the first metal sheet 21, the fourth stub 15 and the second metal sheet 22 are arranged in sequence to form a frame structure close to a rectangle, and the first stub 11 and the second stub 12 are located within this frame.

[0064] Such as Figure 2 and Figure 3 As shown, in some embodiments, the electric field detection device further includes: a processing module 3. The input ends of the processing module 3 are respectively connected to the first stub 11 and the second stub 12. The processing module 3 is used to obtain the relative value or absolute value of the first electric field according to the first differential mode current.

[0065] It can be understood that since the input ends of the processing module 3 are respectively connected to the first stub 11 and the second stub 12, the processing module 3 can receive the first differential mode current transmitted by the first stub 11 and the second stub 12, so as to obtain the relative value or absolute value of the first electric field through the calculation and processing of the first differential mode current, and further realize the accurate detection of the first electric field, meeting the use requirements of the near-field scanning system.

[0066] It should be noted that the specific type of the processing module 3 can be set according to actual needs, and there is no limitation in this regard. For example, the processing module 3 can be a vector network analyzer, a spectrum analyzer, etc. with calculation and processing functions.

[0067] As Figure 1 shown, in some embodiments, the electric field detection device further includes: a metal ground 4, the metal ground 4 is disposed adjacent to the dipole 1, and the shielding metal 2 is disposed at one end of the metal ground 4 close to the dipole 1.

[0068] It can be understood that since the shielding metal 2 is disposed at one end of the metal ground 4 close to the dipole 1, the shielding metal 2 can utilize the metal ground 4 to approach a perfect electric conductor (PEC). According to the electromagnetic field boundary conditions, the magnetic field in the normal direction of the perfect conductor is zero. Therefore, when the shielding metal 2 blocks the gap 13 in the second direction, it can reduce or even completely block the magnetic field component passing through the gap 13, thereby effectively suppressing the generation of the second differential mode current in the first stub 11 and the second stub 12, and further reducing the interference of the magnetic field on the first electric field detection, improving the detection accuracy of the electric field detection device, and thus meeting the usage requirements of the near-field scanning system.

[0069] It should be noted that a perfect conductor is also called an ideal conductor. A perfect conductor refers to a substance with a resistance of 0, that is, an infinite conductivity. There is no electric field and time-varying magnetic field in an ideal conductor, and there is no tangential electric field and normal magnetic field on its surface.

[0070] The specific type of the metal ground 4 can be set according to actual needs, and there is no limitation thereto. By way of example, the metal ground 4 can be a metal housing structure, and the metal ground 4 is used for accommodating wires, shielding signals, grounding, etc.

[0071] As Figure 1 and Figure 2 shown, in some embodiments, the electric field detection device further includes: a transmission line 5, the transmission line 5 includes: a first wire 51 and a second wire 52, the first wire 51 and the second wire 52 are disposed adjacent to each other in a first direction, and the first wire 51 and the second wire 52 are respectively arranged in a third direction. One end of the first wire 51 is connected to one end of the first stub 11 close to the second stub 12, and one end of the second wire 52 is connected to one end of the second stub 12 close to the first stub 11. The first wire 51 and the second wire 52 are used for transmitting the first differential mode current; wherein, the metal ground 4 is disposed adjacent to the transmission line 5, and the metal ground 4 is located around the first wire 51 and the second wire 52. The first direction and the third direction form a second preset angle, and the second direction and the third direction form a third preset angle.

[0072] It can be understood that since one end of the first wire 51 is connected to one end of the first stub 11 close to the second stub 12, and one end of the second wire 52 is connected to one end of the second stub 12 close to the first stub 11, the first wire 51 and the second wire 52 can transmit the first differential-mode current generated by the first stub 11 and the second stub 12 outward, facilitating the accurate detection of the first electric field according to the first differential-mode current. At the same time, since the first wire 51 and the second wire 52 are arranged adjacent to each other in the first direction, and the first wire 51 and the second wire 52 are respectively arranged in the third direction, and the metal ground 4 is located around the first wire 51 and the second wire 52, the metal ground 4 can not only improve the shielding effect of the shielding metal 2 on the magnetic field in the second direction, but also shield and protect the first wire 51 and the second wire 52, thus ensuring the stable signal transmission of the first wire 51 and the second wire 52.

[0073] It should be noted that the first wire 51 and the second wire 52 are used to transmit the first differential-mode current. The specific types of the first wire 51 and the second wire 52 can be set according to actual needs, and there is no limitation in this regard. By way of example, the first wire 51 and the second wire 52 can be respectively long-strip metal structures.

[0074] The third direction can be set according to actual needs, and there is no limitation in this regard. By way of example, the second preset angle and the third preset angle are respectively 90 degrees, the first direction, the second direction and the third direction are perpendicular to each other in pairs, and the third direction belongs to the normal direction of the electric field detection device. The electric field arranged in the third direction can be called the normal electric field.

[0075] As Figure 2 shown, in some embodiments, the electric field detection device further includes: a balanced-unbalanced impedance converter 6. The first input end of the balanced-unbalanced impedance converter 6 is connected to one end of the first wire 51 far from the first stub 11, the second input end of the balanced-unbalanced impedance converter 6 is connected to one end of the second wire 52 far from the second stub 12, and the output end of the balanced-unbalanced impedance converter 6 outputs the first differential-mode current; wherein, the balanced-unbalanced impedance converter 6 is used to suppress the common-mode current generated by the coupling of the first stub 11 and the second stub 12 with the second electric field, and the second electric field is arranged in the third direction.

[0076] It can be understood that when the first stub 11 and the second stub 12 are placed in the second electric field arranged in the third direction, the gap 13 can be used to couple with the second electric field to generate a common-mode current. And because the mode of the common-mode current is different from that of the first differential-mode current, the balanced-unbalanced impedance converter 6 can use the signal conversion to suppress the common-mode current generated by the first stub 11 and the second stub 12, thereby reducing the interference of the second electric field arranged in the third direction on the first electric field detection and improving the detection accuracy of the electric field detection device, thus meeting the use requirements of the near-field scanning system.

[0077] It should be noted that the balanced-unbalanced impedance converter 6 is also called a balun, which is used to convert a balanced signal into an unbalanced signal, or convert an unbalanced analysis signal into a balanced signal. Its basic principle is based on electromagnetic environment coupling and impedance matching. The specific type of the balanced-unbalanced impedance converter 6 can be set according to actual needs, and no limitation is imposed thereon.

[0078] Common Mode Current refers to the current that is transmitted simultaneously through two conductors or paths of a circuit. They have the same direction and magnitude between the two conductors. These currents are usually caused by external interference or noise in the circuit. They do not carry effective differential signals but have a negative impact on signal quality.

[0079] As Figure 2 shown, in some embodiments, the electric field detection device further includes: a first connector 7. The input ends of the first connector 7 are respectively connected to one end of the first wire 51 away from the first branch 11 and one end of the second wire 52 away from the second branch 12. The ground end of the first connector 7 is connected to the metal ground 4, and the output end of the first connector 7 is used to be clamped with the input end of the second connector 8.

[0080] It can be understood that since the input ends of the first connector 7 are respectively connected to one end of the first wire 51 away from the first branch 11 and one end of the second wire 52 away from the second branch 12, and the ground end of the first connector 7 is connected to the metal ground 4, and the output end of the first connector 7 is clamped with the input end of the second connector 8, the first connector 7 and the second connector 8 can not only stably transmit the first differential mode current transmitted by the first wire 51 and the second wire 52, but also are convenient for disassembly and assembly, and are more convenient to use.

[0081] It should be noted that the first connector 7 and the second connector 8 are used for the transmission of the first differential mode current. The specific types of the first connector 7 and the second connector 8 can be set according to actual needs, and no limitation is imposed thereon. For example, the first connector 7 and the second connector 8 can be a clamping structure of a male seat and a female seat, or other clamping structures.

[0082] Among them, the input end of the first connector 7 can be connected to the output end of the balanced-unbalanced impedance converter 6, and the output end of the second connector 8 can be connected to the input end of the processing module 3.

[0083] As Figure 1 shown, in some embodiments, the electric field detection device further includes: an insulating connector 9. The insulating connector 9 is disposed on the metal ground 4, and the dipole 1 is disposed on the insulating connector 9.

[0084] It can be understood that since the insulating connector 9 is disposed on the metal ground 4 and the dipole 1 is disposed on the insulating connector 9, the dipole 1 can not only be stably disposed on the metal ground 4 by using the insulating connector 9, but also be insulated from the metal ground 4 by using the insulating connector 9, ensuring the stable detection of the dipole 1 for the first electric field.

[0085] It should be noted that the specific type of the insulating connector 9 can be set according to actual needs, and there is no limitation thereto. By way of example, the insulating connector 9 can be insulating glue or the like. Among them, the insulating connector 9 is also used to connect the shielding metal 2 and the dipole 1.

[0086] Based on the electric field detection device of the present embodiment, verification can be performed based on a verification system. By way of example, as Figure 3 shown, the verification system includes: a first electric field detection device 100, a first microstrip line 300, a second electric field detection device 200, and a second microstrip line 400. Both the first electric field detection device 100 and the second electric field detection device 200 are electric field detection devices of the embodiments of the present disclosure.

[0087] Specifically, the output end of the processing module 3 of the first electric field detection device 100 is connected to the first end of the first microstrip line 300. The second end of the first microstrip line 300 is connected to a first load. The first microstrip line 300 is disposed along a first direction. The first microstrip line 300 transmits a quasi-TEM (Transverse Electromagnetic Mode) mode. The first stub 11 and the second stub 12 of the first electric field detection device 100 are located directly above the middle of the first microstrip line 300. The output end of the processing module 3 of the second electric field detection device 200 is connected to the first end of the second microstrip line 400. The second end of the second microstrip line 400 is connected to a second load. The second microstrip line 400 is disposed along a second direction. The second microstrip line 400 transmits a quasi-TEM mode. The first stub 11 and the second stub 12 of the second electric field detection device 200 are located directly above the middle of the second microstrip line 400.

[0088] Thus, the first electric field detection device 100 is placed at 90 degrees at the maximum tangential electric field and the maximum tangential magnetic field of the first microstrip line 300, and the second electric field detection device 200 is placed at 0 degrees at the maximum tangential electric field and the maximum tangential magnetic field of the second microstrip line 400. The processing module 3 of the first electric field detection device 100 and the processing module 3 of the second electric field detection device 200 can be used to verify the detection of the tangential electric field.

[0089] It should be noted that the processing module 3 of the first electric field detection device 100 and the processing module 3 of the second electric field detection device 200 can be the same processing module 3, that is, the output end of the processing module 3 has two ports, and the input end of the processing module 3 has two ports. When the processing module 3 uses a vector network analyzer, the sensitivity of the first electric field detection device 100 and the first electric field detection device 100 can be determined according to the magnitude of S output by the vector network analyzer. 21 The sensitivity of the first electric field detection device 100 and the first electric field detection device 100 can be determined according to the magnitude of S output by the vector network analyzer.

[0090] The distances between the first branch 11 and the second branch 12 of the first electric field detection device 100 and the first microstrip line 300, and the distances between the first branch 11 and the second branch 12 of the second electric field detection device 200 and the second microstrip line 400 can be set according to actual needs, and there is no limitation here. For example, the distance can be 1 mm.

[0091] The specific types of the first load and the second load can be set according to actual needs, and there is no limitation here. For example, the first load and the second load can be 50-ohm resistors respectively.

[0092] Based on the electric field detection device of this embodiment and using the verification system of this embodiment, the Figure 4 and Figure 5 shown curve graph is obtained.

[0093] As Figure 4 shown, the abscissa is the working frequency band of the electric field detection device, and the ordinate is the coupling value between the electric field detection device and the magnetic field. In the range of 1.5 GHz - 7.5 GHz, compared with the electric field detection device without the shielding metal 2 in the related embodiment, the coupling value between the electric field detection device of this embodiment and the magnetic field is reduced by about 5 dB.

[0094] As Figure 5 shown, the abscissa is the working frequency band of the electric field detection device, and the ordinate is the coupling value between the electric field detection device and the first electric field. In the range of 1.5 GHz - 7.5 GHz, compared with the electric field detection device without the shielding metal 2 in the related embodiment, the coupling value between the electric field detection device of this embodiment and the first electric field is close.

[0095] The embodiment of the present disclosure also proposes a near-field scanning system, including: the electric field detection device as in the embodiment of the present disclosure.

[0096] It can be understood that since the first branch 11 and the second branch 12 are arranged along the first direction, and there is a gap 13 between the first branch 11 and the second branch 12, when the first branch 11 and the second branch 12 are placed in the first electric field arranged along the first direction, the gap 13 can be used to couple with the first electric field, thereby generating a first differential-mode current, and then the first electric field can be detected by using the first differential-mode current. At the same time, when the first branch 11 and the second branch 12 are placed in the magnetic field arranged along the second direction, the gap 13 can be used to couple with the magnetic field, thereby generating a second differential-mode current, and since the second differential-mode current has the same mode as the first differential-mode current, the magnetic field interferes with the detection of the first electric field.

[0097] Since the shielding metal 2 and the dipole 1 are arranged adjacent to each other along the second direction, and at least part of the gap 13 overlaps with the projection of the shielding metal 2 along the second direction, the shielding metal 2 can reduce or even completely block the magnetic field component passing through the gap 13, thereby effectively suppressing the generation of the second differential-mode current by the first branch 11 and the second branch 12, and further reducing the interference of the magnetic field on the detection of the first electric field, improving the detection accuracy of the electric field detection device, and thus meeting the use requirements of the near-field scanning system.

[0098] It should be noted that the near-field scanning system can use the electric field detection device to detect the electromagnetic fields radiated by devices or whole machine products such as wireless communication terminals, integrated circuits, automotive electronics, chips, and displays point by point, obtain the relative value or absolute value of the electric field in the corresponding test area, analyze the electromagnetic radiation interference situation, quickly locate and analyze the interference sources on the device under test, and become a powerful tool for electromagnetic interference rectification.

[0099] In the description of the present disclosure, terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0100] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the technical field to which the embodiments of the present disclosure belong.

[0101] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0102] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An electric field detection device, characterized in that Comprising: A dipole, the dipole comprising: a first stub and a second stub, the first stub and the second stub being arranged along a first direction, and a gap being provided between the first stub and the second stub, the first stub and the second stub being configured to couple a first electric field arranged along the first direction and generate a first differential-mode current; A shielding metal, the shielding metal and the dipole being adjacent to each other along a second direction, and at least a part of the gap overlapping with a projection of the shielding metal along the second direction, the shielding metal being configured to shield a magnetic field along the second direction to suppress a second differential-mode current generated by coupling of the first stub and the second stub with the magnetic field; Wherein, the first direction and the second direction form a first preset angle.

2. The electric field detection device according to claim 1, wherein The shielding metal comprises: A first metal sheet, the first metal sheet being arranged on one side of the dipole, and at least a part of the gap overlapping with a projection of the first metal sheet along the second direction, the first metal sheet being configured to shield the magnetic field along the second direction.

3. The electric field detection device according to claim 2, characterized in that The shielding metal further comprises: A second metal sheet, the second metal sheet being arranged on a side of the dipole away from the first metal sheet, and at least a part of the gap overlapping with a projection of the second metal sheet along the second direction, the second metal sheet being configured to shield the magnetic field along the second direction.

4. The electric field detection device according to claim 3, wherein All of the gap overlaps with a projection of the first metal sheet along the second direction; And / or, All of the gap overlaps with a projection of the second metal sheet along the second direction.

5. The electric field detection device according to claim 1, characterized in that The dipole further comprises: A third stub, the third stub being arranged at an end of the first stub away from the second stub, and at least one end of the third stub extending along a direction close to the shielding metal after being bent; And / or, A fourth stub, the fourth stub being arranged at an end of the second stub away from the first stub, and at least one end of the fourth stub extending along a direction close to the shielding metal after being bent.

6. The electric field detection device according to claim 1, characterized in that The electric field detection device further comprises: A processing module, an input end of the processing module being respectively connected to the first stub and the second stub, the processing module being configured to obtain a relative value or an absolute value of the first electric field according to the first differential-mode current.

7. The electric field detection device according to any one of claims 1-6, characterized in that, The electric field detection device further comprises: A metal ground, the metal ground and the dipole being adjacent to each other, and the shielding metal being arranged at an end of the metal ground close to the dipole.

8. The electric field detection device according to claim 7, wherein The electric field detection device further comprises: A transmission line, the transmission line comprising: a first wire and a second wire, the first wire and the second wire being adjacent to each other along the first direction, and the first wire and the second wire being respectively arranged along a third direction, one end of the first wire being connected to an end of the first stub close to the second stub, one end of the second wire being connected to an end of the second stub close to the first stub, the first wire and the second wire being configured to transmit the first differential-mode current; Wherein, the metal ground is disposed adjacent to the transmission line, and the metal ground is located around the first wire and the second wire. The first direction and the third direction form a second preset angle, and the second direction and the third direction form a third preset angle.

9. The electric field detection device according to claim 8, wherein The electric field detection device further includes: A balanced-unbalanced impedance converter, wherein a first input end of the balanced-unbalanced impedance converter is connected to an end of the first wire away from the first stub, a second input end of the balanced-unbalanced impedance converter is connected to an end of the second wire away from the second stub, and an output end of the balanced-unbalanced impedance converter outputs the first differential-mode current; Wherein, the balanced-unbalanced impedance converter is used to suppress a common-mode current generated by coupling of the first stub and the second stub with a second electric field, and the second electric field is arranged along the third direction.

10. The electric field detection device according to claim 8, characterized in that, The electric field detection device further includes: A first connector, wherein an input end of the first connector is respectively connected to an end of the first wire away from the first stub and an end of the second wire away from the second stub, a ground end of the first connector is connected to the metal ground, and an output end of the first connector is used for snap connection with an input end of a second connector.

11. The electric field detection device according to claim 7, wherein, The electric field detection device further includes: An insulating connector, wherein the insulating connector is disposed on the metal ground, and the dipole is disposed on the insulating connector.

12. A near-field scanning system, characterized in that, Including: The electric field detection device according to any one of claims 1-11.

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