Displacement detection radio frequency tag
By introducing a metal sheet structure into the RFID tag to create a planar capacitance effect, the problem of RFID tag damage is solved, enabling accurate detection and reuse of RFID tags, reducing losses, and improving application efficiency.
Patent Information
- Application Number
- CN202423267066.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing RFID tags are easily damaged in repeated use scenarios, leading to increased usage costs and labeling workload, and making reuse impossible.
Design a displacement detection RFID tag. By introducing a metal sheet structure between the two working terminals of the RFID chip, a planar capacitance effect is constructed. By utilizing the performance change caused by position change, the application status of the RFID tag can be accurately detected.
While ensuring the structural integrity of the RFID tag, accurate detection of the RFID tag is achieved, loss is reduced, application efficiency is improved, and RFID tag reuse is supported.
Smart Images
Figure CN223637988U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a displacement detection radio frequency label belongs to radio frequency label technical field. BACKGROUND
[0002] As a passive Internet of Things identification technology, RFID has been applied in more and more scenarios. In the fields of clothing, logistics, asset management, etc., RFID technology is adopted due to its unique passivity, group reading, high cost performance and other advantages. RFID system can work normally, and generally requires that the tag, reader and communication link are in normal state. Generally speaking, one of the most common methods to achieve anti-fake and anti-disassembly is to destroy the RFID tag, such as destroying the detection line of RFID or making the RFID tag into a fragile structure, which can achieve the functions of anti-fake and anti-tearing, but the disadvantage is obvious, that is, the destruction is one-time and cannot be reused. For repeated use scenarios, this not only increases the use cost of RFID tags, but also causes certain burden to the work of discarding and labeling. SUMMARY
[0003] The technical problem to be solved by the utility model is to provide a displacement detection radio frequency label. For the radio frequency label, a metal sheet structure with a designed mutual distance is added to construct a flat plate capacitance effect, and then the performance change caused by the position change is realized to accurately detect the application state of the radio frequency label.
[0004] The utility model discloses a kind of displacement detection radio frequency labels, including radio frequency chip, two first wires, two radiation loops, and at least two first metal sheets, at least one second metal sheet, wherein the two working ends of radio frequency chip are respectively connected one radiation loop, one end on one first wire, all first metal sheets are divided into two groups, each group is respectively corresponding to each first wire one-to-one, and each first wire is connected each first metal sheet in corresponding group;Each second metal sheet, a single second metal sheet is respectively corresponding to at least one first metal sheet in each group, and all each first metal sheet is respectively corresponding to one second metal sheet, each second metal sheet is respectively set in one side of its corresponding all first metal sheet whole, respectively along the projection direction perpendicular to the surface of each first metal sheet, the projection of each first metal sheet is between the projection of the local area of corresponding second metal sheet that it faces and there is coincidence, the surface of each first metal sheet is respectively parallel to the local area surface of the surface of corresponding second metal sheet that it faces, and keep the interval of preset greater than 0, realize flat plate capacitance effect.
[0005] As a preferred technical scheme of the utility model: it further includes two second wires, and the two working ends of radio frequency chip are respectively connected one radiation loop through one second wire.
[0006] As a preferred technical scheme of the utility model: the other end of two first wires is opposite to each other.
[0007] As a preferred technical scheme of the utility model: still include first bearing carrier and second bearing carrier, wherein, radio frequency chip, two first wires, two second wires, two radiation loops and each first metal sheet are all pasted on one surface or inside of first bearing carrier, each second metal sheet is pasted on one surface or inside of second bearing carrier.
[0008] As a preferred technical scheme of the utility model: two first wires and each first metal sheet connected respectively are axially symmetrical distribution, and two second wires and the radiation loop connected are axially symmetrical distribution.
[0009] As a preferred technical scheme of the utility model: the number of first metal sheet, the number of second metal sheet are all even respectively, and all first metal sheet is divided into two groups evenly;Each second metal sheet, a single second metal sheet is respectively corresponding with the same number of first metal sheet in each group, and all first metal sheet is respectively corresponding with a second metal sheet.
[0010] As a preferred technical scheme of the utility model: the number of first metal sheet is 8, the number of second metal sheet is 4, and all first metal sheet is divided into two groups evenly;Each second metal sheet, a single second metal sheet is respectively corresponding with 2 first metal sheet in each group, and all first metal sheet is respectively corresponding with a second metal sheet.
[0011] The displacement detection radio frequency tag of the utility model adopts the above technical scheme compared with prior art, and has the following technical effects:
[0012] The utility model discloses a kind of displacement detection radio frequency tags, for radio frequency tag basic structure, design radio frequency chip two working ends are connected each first metal sheet via first wire respectively, and design the interval position relationship between each second metal sheet and the first metal sheet connected by radio frequency chip two working ends, the coupling loop between radio frequency chip two working ends is constructed, obtains the flat plate capacitance effect between first metal sheet and second metal sheet, so according to the influence of equivalent capacitance change brought by position change between first metal sheet and second metal sheet on radio frequency tag resonant frequency, accurate detection is realized to the relative position between first metal sheet and second metal sheet, and then accurate detection is realized to the structure state of the article provided by radio frequency tag on the basis of guaranteeing the integrity of radio frequency tag structure, reduce the loss of radio frequency tag in application, improve application efficiency by multiplexing. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1The utility model discloses a displacement detection radio frequency tag, which comprises a first bearing carrier and a second bearing carrier.
[0014] Figure 2 The utility model discloses a displacement detection radio frequency tag, which comprises a first bearing carrier and a second bearing carrier.
[0015] Figure 3 The utility model discloses a displacement detection radio frequency tag, which comprises a first bearing carrier and a second bearing carrier.
[0016] Figure 4 The utility model discloses a displacement detection radio frequency tag, which comprises a first bearing carrier and a second bearing carrier.
[0017] Figure 5 The utility model discloses a displacement detection radio frequency tag, which comprises a first bearing carrier and a second bearing carrier.
[0018] Wherein, 1. radio frequency chip, 2. first wiring, 3. radiation loop, 4. first metal sheet, 5. second metal sheet, 6. second wiring, 7. first bearing carrier, 8. second bearing carrier. DETAILED DESCRIPTION
[0019] The utility model discloses a displacement detection radio frequency tag, which comprises a first bearing carrier and a second bearing carrier.
[0020] The utility model discloses a displacement detection radio frequency tag, which comprises a first bearing carrier and a second bearing carrier. Figure 1 、 Figure 2 、 Figure 3As shown, the specific design includes a radio frequency chip 1, two first wires 2, two radiation loops 3, and at least two first metal sheets 4 and at least one second metal sheet 5, wherein two working ends of the radio frequency chip 1 are respectively connected to one radiation loop 3 and one end of one first wire 2, all the first metal sheets 4 are divided into two groups, each group corresponds to each first wire 2, and each first metal sheet 4 in the corresponding group is connected to the corresponding first wire 2; each second metal sheet 5 corresponds to at least one first metal sheet 4 in each group, and all the first metal sheets 4 correspond to one second metal sheet 5, each second metal sheet 5 is arranged on one side of the corresponding all first metal sheets 4, and the projection of each first metal sheet 4 on the projection direction perpendicular to the surface of the first metal sheet 4 overlaps with the projection of the local area of the corresponding second metal sheet 5, the surface of each first metal sheet 4 is parallel to the surface of the corresponding second metal sheet 5, and a predetermined distance greater than 0 is maintained, so as to realize the flat plate capacitance effect, and thus the coupling loop structure is realized by the corresponding second metal sheet 5 between the two working ends of the radio frequency chip 1 and each first metal sheet 4 connected by the first wire 2.
[0021] As shown in the above designed displacement detection radio frequency tag structure, in actual application, Figure 1 、 Figure 2 、 Figure 3 as shown, the further design also includes two second wires 6, and the two working ends of the radio frequency chip 1 are respectively connected to one radiation loop 3 through one second wire 6, that is, the connection between the two working ends of the radio frequency chip 1 and the radiation loop 3 is realized by the wire, so that the position layout of the radiation loop 3 in actual application is wider and the position design is more flexible.
[0022] As shown in Figure 1 , the structure between each first metal sheet 4 connected to the two working ends of the radio frequency chip 1 is not closed, and in actual application, a closed structure can also be used, that is, the other end of the two first wires 2 is connected to each other, and the other end of the two first wires 2 is connected to the two working ends of the radio frequency chip 1, that is, a closed structure is formed, and each first metal sheet 4 is connected to the corresponding first wire 2, which can also be applied to the application of the design scheme of the utility model.
[0023] In the actual application of realizing the positional relationship between each first metal sheet 4 and the corresponding second metal sheet 5, a carrier structure design is further introduced, that is, Figure 1 、 Figure 2 、 Figure 3As shown, it also includes a first carrier 7 and a second carrier 8, wherein the radio frequency chip 1, two first traces 2, two second traces 6, two radiation loops 3, and each first metal sheet 4 are attached to one surface or inside of the first carrier 7, and each second metal sheet 5 is attached to one surface or inside of the second carrier 8; and further designed the two first traces 2 and the first metal sheets 4 connected to them are axially symmetrically distributed, and the two second traces 6 and the radiation loops 3 connected to them are axially symmetrically distributed.
[0024] by Figure 1 , Figure 2 , Figure 3 The specific structure shown is applied as an embodiment, where the number of first metal sheets 4 and the number of second metal sheets 5 are both even numbers, and all first metal sheets 4 are divided into two groups. In each second metal sheet 5, a single second metal sheet 5 corresponds to the same number of first metal sheets 4 in each group. Specifically, the design ensures that the number of first metal sheets 4 associated with each single second metal sheet 5 is equal from each group. Under this symmetrical structural design, for example, the design uses 8 first metal sheets 4 and 4 second metal sheets 5, with all first metal sheets 4 divided into two groups. In each second metal sheet 5, a single second metal sheet 5 corresponds to 2 first metal sheets 4 in each group, and each first metal sheet 4 corresponds to one second metal sheet 5.
[0025] In practical applications, the above structure is based on the distance D between the surface of each first metal sheet 4 and the local area of the surface of the corresponding second metal sheet 5 it faces. The parallel capacitance C formed by the planar capacitance effect between the first metal sheet 4 and the second metal sheet 5 is determined by the following formula.
[0026]
[0027] Where S represents the overlapping area between the first metal sheet 4 and the second metal sheet 5, and ε represents the dielectric constant; in application, when at least one of the overlapping area and the spacing d between the first metal sheet 4 and the corresponding second metal sheet 5 changes, the value of the parallel plate capacitor also changes accordingly. At this time, the resonant frequency formed by the capacitance C1 of the video chip 1 itself, the parallel plate capacitor C2, and the inductance L of the coupling circuit between the two working terminals of the RF chip 1 and the first metal sheet 4 also changes, according to the following formula:
[0028]
[0029] Wherein, C1 represents the capacitance value of the radio frequency chip 1 itself, C2 represents the flat plate capacitance value provided by the overlapping area between the first metal sheet 4 and the second metal sheet 5, and L represents the inductance provided by the coupling loop formed by the first metal sheet 4 and the first trace 2; when the distance between the first metal sheet 4 and the second metal sheet 5 changes, such as 0 < D1 < D2 < D3, that is, the distance between the coupling loop and each second metal sheet 5 is larger and larger, the resonant frequency of the designed radio frequency tag is as shown in the following formula: Figure 4
[0030] When the overlapping area between each first metal sheet 4 and the corresponding second metal sheet 5 changes, such as S1 > S2 > S3, that is, the overlapping area between the coupling loop and each second metal sheet 5 is smaller and smaller, the resonant frequency of the designed radio frequency tag is as shown in the following formula: Figure 5
[0031] In actual application, because the resonant frequency of the reader antenna is fixed, when the resonant frequency of the radio frequency tag changes, the signal strength (such as RSSI value) between the radio frequency tag and the reader changes, and the background determines the object structure state by detecting the signal strength; in specific implementation, the first bearing carrier 7 and the second bearing carrier 8 are both non-metal materials; the radio frequency chip 1, the coupling loop and the radiation loop 3 can be on the surface or in the interior of the first bearing carrier 7, and each second metal sheet 5 can be on the surface or in the interior of the second bearing carrier 8;
[0032] In actual application, each second metal sheet 5 can be a whole piece of metal, or can be divided into multiple areas as shown in the following formula: Figure 1 The essence of all of them is to change the resonant frequency of the tag by changing the overlapping area.
[0033] The designed application of the utility model is applied to specific object applications, such as the first bearing carrier 7 and the second bearing carrier 8 are respectively arranged at two positions on the target object, and the positional relationship between the metal sheets arranged on the two bearing carriers satisfies the above design; in the specific actual detection design of the target object, if the positional relationship between the local areas of the target objects arranged on the two bearing carriers changes, such as opening and damaging, the overlapping area between the first metal sheet 4 and the second metal sheet 5 changes, which immediately reflects the influence of the flat plate capacitance effect on the resonant frequency of the radio frequency tag, so that the designed radio frequency tag can accurately detect the structure state of the target object, and the integrity of the radio frequency tag is ensured in the application process, the reuse of the radio frequency tag for such purposes is realized, the loss of the radio frequency tag in the application is reduced, and the application efficiency is improved through reuse.
[0034] The embodiment of the utility model is explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, and various changes can be made within the knowledge range possessed by those of ordinary skill in the art without departing from the purpose of the utility model.
Claims
1. A displacement detecting radio frequency tag, characterized by: The application relates to a radio frequency chip (1), two first wires (2), two radiation loops (3), at least two first metal sheets (4) and at least one second metal sheet (5), wherein two working ends of the radio frequency chip (1) are respectively connected with one radiation loop (3) and one end of one first wire (2); all the first metal sheets (4) are divided into two groups, each group is respectively corresponding to each first wire (2), and each first wire (2) is connected with each first metal sheet (4) in the corresponding group; each second metal sheet (5) is respectively corresponding to at least one first metal sheet (4) in each group, and all the first metal sheets (4) are respectively corresponding to one second metal sheet (5); each second metal sheet (5) is arranged on one side of all the first metal sheets (4) corresponding to the second metal sheet (5), and the projection of each first metal sheet (4) is coincided with the projection of the local area of the corresponding second metal sheet (5) in the direction perpendicular to the surface of the first metal sheet (4), the surface of each first metal sheet (4) is parallel to the surface of the local area of the corresponding second metal sheet (5) and maintains a preset interval greater than 0, and the flat plate capacitor effect is realized.
2. The displacement detecting radio frequency tag according to claim 1, wherein: The application further comprises two second wires (6), and the two working ends of the radio frequency chip (1) are respectively connected with one radiation loop (3) through one second wire (6).
3. The displacement detecting radio frequency tag according to claim 1, wherein: The other ends of the two first wires (2) are connected with each other.
4. The displacement detecting radio frequency tag according to claim 2, wherein: The application further comprises a first bearing carrier (7) and a second bearing carrier (8), wherein the radio frequency chip (1), the two first wires (2), the two second wires (6), the two radiation loops (3) and each first metal sheet (4) are arranged on one surface or in one interior of the first bearing carrier (7), and each second metal sheet (5) is arranged on one surface or in one interior of the second bearing carrier (8).
5. The displacement detecting radio frequency tag according to any one of claims 2 or 4, wherein: The two first wires (2) and the first metal sheets (4) connected with the two first wires (2) are axially symmetrical, and the two second wires (6) and the radiation loops (3) connected with the two second wires (6) are axially symmetrical.
6. The displacement detecting radio frequency tag according to claim 5, wherein: The number of the first metal sheets (4) and the number of the second metal sheets (5) are both even, and all the first metal sheets (4) are divided into two groups; each second metal sheet (5) is respectively corresponding to the same number of first metal sheets (4) in each group, and all the first metal sheets (4) are respectively corresponding to one second metal sheet (5).
7. The displacement detecting radio frequency tag according to claim 6, wherein: The number of the first metal sheets (4) is 8, the number of the second metal sheets (5) is 4, all the first metal sheets (4) are divided into two groups; each second metal sheet (5) is respectively corresponding to two first metal sheets (4) in each group, and all the first metal sheets (4) are respectively corresponding to one second metal sheet (5).