Microwave magnetic field detector
By designing a microwave magnetic field detector with a tapered structure, the problems of large size and low accuracy of traditional probes have been solved, and higher precision microwave radiation detection has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU DIANZI UNIV
- Filing Date
- 2025-07-18
- Publication Date
- 2026-05-12
AI Technical Summary
传统近场探头体积大、检测精度低，无法满足高精度微波辐射检测需求。
A microwave magnetic field detector is designed by using a tapered structure where the distance between the ends of the first and second grounding wires and the signal line gradually decreases to suppress the common-mode surface current generated by the detection ring, reduce noise, and improve detection accuracy.
By using a tapered structure design, the volume of the detector tip is reduced, noise is suppressed, detection accuracy is improved, and the energy of the induced signal is effectively transmitted, thereby enhancing the detection effect.
Smart Images
Figure CN224231954U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of microwave magnetic field detection, and in particular to a microwave magnetic field detector. Background Technology
[0002] With the increasing prevalence of electronic products in modern society, the demand for integrated circuits is also constantly rising. However, some integrated circuits emit excessive microwave radiation, which can harm human health. To address this issue, some existing technologies use near-field probes to detect microwave radiation, converting the detected radiation into electrical signals. However, traditional near-field probes suffer from large size and low detection accuracy, failing to adequately meet the ever-increasing demands for microwave radiation detection. Utility Model Content
[0003] Therefore, it is necessary to provide a microwave magnetic field detector to address the problems of large size and low detection accuracy of existing near-field probes.
[0004] A microwave magnetic field detector, comprising:
[0005] A first grounding wire, the first grounding wire having a first end;
[0006] A second grounding wire, the second grounding wire having a second end;
[0007] A signal line having a third end and a fourth end;
[0008] A dielectric substrate has a first surface and a second surface. A first ground wire, a signal wire, and a second ground wire are arranged side by side on the first surface, such that a first end, a third end, and a second end are arranged side by side. The signal wire is spaced apart from the first ground wire and the second ground wire. In the direction from the fourth end to the third end, the distance between the outer edge of the first end and the central axis of the signal wire gradually decreases, and the distance between the outer edge of the second end and the central axis of the signal wire gradually decreases.
[0009] A conductive layer is disposed on the second surface, and a via is formed on the dielectric substrate. The first grounding wire and the second grounding wire are electrically connected to the conductive layer through the via.
[0010] A detection ring, wherein the two ends of the detection ring are respectively disposed on the first end and the third end.
[0011] In some embodiments, the distance between the outer edge of the first end and the central axis of the signal line is d1, the distance between the outer edge of the second end and the central axis of the signal line is d2, and at the same position on the central axis of the signal line, d1=d2.
[0012] In some embodiments, the maximum value of d1 and d2 is 10 mm, the minimum value of d1 and d2 is 5 mm, and the length of the first end and the second end in the direction of the central axis of the signal line is 20 mm.
[0013] In some embodiments, the profiles of the outer edges of the first end and the outer edges of the second end are both straight lines.
[0014] In some embodiments, the outer edges of the first grounding wire and the outer edges of the second grounding wire coincide with the edge of the first surface.
[0015] In some embodiments, the width of the third end gradually decreases in the direction from the fourth end to the third end.
[0016] In some embodiments, the width of the third end is d3, the maximum value of d3 is 1.12 mm, the minimum value of d3 is 0.8 mm, and the length of the third end is 2.5 mm.
[0017] In some embodiments, the side profiles of the third end are both straight lines.
[0018] In some embodiments, the width of the fourth end gradually decreases in the direction from the third end to the fourth end.
[0019] In some embodiments, the width of the fourth end is d4, the maximum value of d4 is 1.12 mm, the minimum value of d4 is 0.8 mm, and the length of the fourth end is 2.5 mm.
[0020] The beneficial effects of this utility model are as follows:
[0021] In the direction from the fourth end to the third end, by gradually reducing the distance between the outer edge of the first end and the central axis of the signal line, and simultaneously gradually reducing the distance between the outer edge of the second end and the central axis of the signal line, the volume of the microwave magnetic field detector end can be reduced, thus reducing the contact and friction between the microwave magnetic field detector end and the non-planar sample. On the other hand, it can suppress the common-mode surface current excited by the induced magnetic field generated by the detector ring, thereby suppressing the ringing-like ripples and surge ripples of the detector ring in the mid-to-high frequency band, reducing the noise of the detector ring, and improving the detection accuracy.
[0022] Furthermore, the above structural design can effectively reduce the high-order modes excited during the transmission of the induced signal, suppress the energy of the induced signal from dissipating and being lost in all directions, and enable the desired energy in the induced signal to be transmitted along the signal line. Attached Figure Description
[0023] Figure 1 This is a three-dimensional structural diagram of the microwave magnetic field detector in an embodiment of the present invention. Figure 1 ;
[0024] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;
[0025] Figure 3 for Figure 1 Enlarged structural diagram at point B;
[0026] Figure 4 This is a three-dimensional structural diagram of the microwave magnetic field detector in an embodiment of the present invention. Figure 2 ;
[0027] Figure 5 This is a schematic diagram of the front view structure of the microwave magnetic field detector in an embodiment of this utility model;
[0028] Figure 6 for Figure 5 Enlarged structural diagram at point C;
[0029] Figure 7 for Figure 5 Enlarged structural diagram at point D;
[0030] Figure 8 This is the frequency response curve of the microwave magnetic field detector in this embodiment of the present invention.
[0031] Figure label:
[0032] 1. First grounding wire; 11. First end; 2. Second grounding wire; 21. Second end; 3. Signal line; 31. Third end; 32. Fourth end; 4. Dielectric board; 41. Via; 5. Conductive layer; 6. Probe ring; 7. Coaxial connector. Detailed Implementation
[0033] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, 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, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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.
[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0039] Example:
[0040] like Figures 1-7 As shown, this embodiment provides a microwave magnetic field detector, which is generally T-shaped and specifically includes a first grounding wire 1, a second grounding wire 2, a signal line 3, a dielectric substrate 4, a conductive layer 5, a detection ring 6, and a coaxial connector 7.
[0041] The first grounding wire 1, the second grounding wire 2, and the signal wire 3 all extend generally along the y-axis, which is perpendicular to the x-axis. The signal wire 3 is located between the first grounding wire 1 and the second grounding wire 2, thus the first grounding wire 1, the signal wire 3, and the second grounding wire 2 are arranged side by side in the x-axis direction. The signal wire 3 is spaced apart from the first grounding wire 1 and the second grounding wire 2 to prevent the signal wire 3 from short-circuiting to the first grounding wire 1 and the second grounding wire 2.
[0042] The first grounding wire 1 has a first end 11, the second grounding wire 2 has a second end 21, and the signal wire 3 has a third end 31 and a fourth end 32. The first end 11, the third end 31, and the second end 21 are located on the same end side; in other words, the first end 11, the third end 31, and the second end 21 are arranged side by side in the x-axis direction. The two ends of the probe ring 6 are respectively located on the first end 11 and the third end 31. The coaxial connector 7 is located on the fourth end 32 for signal output.
[0043] The dielectric substrate 4 has a first surface and a second surface. A first ground wire 1, a second ground wire 2, and a signal line 3 are disposed on the first surface, and a conductive layer 5 is disposed on the second surface. At least two vias 41 are provided on the dielectric substrate 4. The first ground wire 1 is electrically connected to the conductive layer 5 through a portion of the vias 41, and the second ground wire 2 is electrically connected to the conductive layer 5 through the remaining vias 41.
[0044] The dielectric substrate 4 is generally T-shaped and is made of Rogers RO5880 dielectric material. The outer edge of the first ground wire 1 (the edge of the first ground wire 1 away from the signal wire 3) is flush with and coincides with the left edge of the first surface, and the outer edge of the second ground wire 2 (the edge of the second ground wire 2 away from the signal wire 3) is flush with and coincides with the right edge of the first surface. The conductive layer 5 extends to the edge of the second surface to completely cover the second surface.
[0045] The above-described structural design and corresponding working principle of the microwave magnetic field detector are existing technologies and will not be described in detail in this embodiment.
[0046] The first difference between the microwave magnetic field detector in this embodiment and the prior art is that, in the direction from the fourth end 32 to the third end 31, the distance d1 between the outer edge of the first end 11 (the edge of the first end 11 away from the signal line 3) and the central axis of the signal line 3 gradually decreases, and the distance d2 between the outer edge of the second end 21 (the edge of the second end 21 away from the signal line 3) and the central axis of the signal line 3 gradually decreases.
[0047] This design firstly creates a tapered structure at the detector ring 6, reducing the end volume of the microwave magnetic field detector and minimizing contact and friction between the detector end and the non-planar sample. Secondly, this tapered structure suppresses the common-mode surface current excited by the induced magnetic field generated by the detector ring 6, thereby suppressing ring-like ripples and surge ripples in the mid-to-high frequency range, reducing noise, and improving detection accuracy. Furthermore, this tapered structure effectively reduces the high-order modes excited during signal transmission, suppressing energy dissipation and loss, and ensuring the desired energy in the signal is transmitted along the signal line 3 to the coaxial connector 7.
[0048] To improve the detection performance of the microwave magnetic field detector, it is necessary to increase the structural symmetry of the detector. Therefore, at the same position on the central axis of signal line 3, d1 = d2.
[0049] For example, in this embodiment, the maximum value of d1 and d2 is 10mm, the minimum value of d1 and d2 is 5mm, and the length of the first end 11 and the second end 21 in the direction of the central axis of the signal line 3 is 20mm.
[0050] Preferably, the outer edges of the first end 11 and the outer edges of the second end 21 are both straight lines.
[0051] To match the tapered structure design, in this embodiment, the width d3 of the third end 31 gradually decreases in the direction from the fourth end 32 to the third end 31.
[0052] For example, the maximum value of d3 is 1.12 mm, the minimum value of d3 is 0.8 mm, and the length of the third end 31 in the direction of the central axis is 2.5 mm. In addition, the side edges of the third end 31 (the edges of the third end 31 near the first end 11 and the edges of the third end 31 near the second end 21) are both straight lines.
[0053] The second difference between this embodiment of the microwave magnetic field detector and the prior art is that, in the direction from the third end 31 to the fourth end 32, the width d4 of the fourth end 32 gradually decreases. For example, the maximum value of d4 is 1.12 mm, the minimum value of d4 is 0.8 mm, and the length of the fourth end 32 is 2.5 mm. This design allows the characteristic impedance at the contact point between the fourth end 32 and the coaxial connector 7 to be as close to 50 Ω as possible.
[0054] The first port of the vector network analyzer is connected to one end of a calibration microstrip line via a first coaxial cable. The calibration microstrip line serves as a calibration element and provides magnetic field information. The characteristic impedance of the calibration microstrip line is 50Ω, and the other end of the calibration microstrip line is connected to a 50Ω load. The second port of the vector network analyzer is connected to a coaxial connector 7 via a second coaxial cable. The distance between the probe ring 6 and the calibration microstrip line is 1mm. Figure 8 As shown, the microwave magnetic field detector in this embodiment exhibits relatively stable amplitude within the 1GHz-20GHz frequency band, and ringing-like ripples and surge ripples are suppressed. Furthermore, with a 1mm spacing between the detector ring 6 and the calibration microstrip line, the spatial resolution of the microwave magnetic field detector in this embodiment is 1mm.
[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0056] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A microwave magnetic field detector, characterized in that, include: The first grounding wire (1) has a first end (11); The second grounding wire (2) has a second end (21); Signal line (3), the signal line (3) having a third end (31) and a fourth end (32); A dielectric substrate (4) has a first surface and a second surface. The first ground wire (1), the signal wire (3), and the second ground wire (2) are arranged side by side on the first surface so that the first end (11), the third end (31), and the second end (21) are arranged side by side. The signal wire (3) is spaced apart from the first ground wire (1) and the second ground wire (2). In the direction from the fourth end (32) to the third end (31), the distance between the outer edge of the first end (11) and the central axis of the signal wire (3) gradually decreases, and the distance between the outer edge of the second end (21) and the central axis of the signal wire (3) gradually decreases. A conductive layer (5) is disposed on the second surface. A via (41) is formed on the dielectric plate (4). The first grounding wire (1) and the second grounding wire (2) are electrically connected to the conductive layer (5) through the via (41). The detection ring (6) has two ends respectively disposed on the first end (11) and the third end (31).
2. The microwave magnetic field detector according to claim 1, characterized in that, The distance between the outer edge of the first end (11) and the central axis of the signal line (3) is d1, and the distance between the outer edge of the second end (21) and the central axis of the signal line (3) is d2. At the same position on the central axis of the signal line (3), d1=d2.
3. The microwave magnetic field detector according to claim 2, characterized in that, The maximum value of d1 and d2 is 10mm, the minimum value of d1 and d2 is 5mm, and the length of the first end (11) and the second end (21) in the direction of the central axis of the signal line (3) is 20mm.
4. The microwave magnetic field detector according to claim 3, characterized in that, The outer edges of the first end (11) and the outer edges of the second end (21) are both straight lines.
5. The microwave magnetic field detector according to claim 1, characterized in that, The outer edge of the first grounding wire (1) and the outer edge of the second grounding wire (2) coincide at the edge of the first surface.
6. The microwave magnetic field detector according to claim 1, characterized in that, In the direction from the fourth end (32) to the third end (31), the width of the third end (31) gradually decreases.
7. The microwave magnetic field detector according to claim 6, characterized in that, The width of the third end (31) is d3, the maximum value of d3 is 1.12mm, the minimum value of d3 is 0.8mm, and the length of the third end (31) is 2.5mm.
8. The microwave magnetic field detector according to claim 6, characterized in that, The side profiles of the third end (31) are both straight lines.
9. The microwave magnetic field detector according to claim 1, characterized in that, In the direction from the third end (31) to the fourth end (32), the width of the fourth end (32) gradually decreases.
10. The microwave magnetic field detector according to claim 9, characterized in that, The width of the fourth end (32) is d4, the maximum value of d4 is 1.12mm, the minimum value of d4 is 0.8mm, and the length of the fourth end (32) is 2.5mm.