An RFID electronic tag with tamper-proof structure

Abstract

This utility model belongs to the field of electronic tag technology and discloses an RFID electronic tag with an anti-tamper structure. It includes a brittle base, an antenna layer on the surface of the brittle base, a tag chip connected to the antenna layer, and multiple breakpoints with a width of 0.01m on the antenna layer. A top cover layer is provided on the surface of the antenna layer, and an adhesive layer for attaching to an object is provided at the bottom of the brittle base. The bottom of the top cover layer is coated with a fine and continuous conductive ink line to form a grid-like detection circuit. In this utility model, the detection circuit is weakly coupled to the antenna in the antenna layer, forming a parasitic capacitance. This causes a significant shift in the antenna's resonant frequency, preventing the energy emitted by the reader at its operating frequency from being effectively received by the tag antenna. This results in a sharp decrease in the tag's reading distance, or even complete unreadable data, thus achieving the anti-tamper function.

Description

Technical Field

[0001] This utility model relates to the field of electronic tag technology, and in particular to an RFID electronic tag with an anti-tamper structure. Background Technology

[0002] RFID electronic tags, as data carriers, serve the functions of identification, item tracking, and information collection. They are applied in many fields, currently primarily in anti-counterfeiting, production lines, warehouse management, and library management. However, the operational data recorded by these 7,000 electronic tags (such as equipment maintenance records) could be maliciously modified if tampered with. In scenarios requiring full traceability, such as pharmaceuticals and luxury goods, tamper-proof mechanisms ensure the tag-product binding relationship remains intact, preventing tampering. Therefore, designing an RFID electronic tag with an tamper-proof structure is particularly important. Utility Model Content

[0003] To overcome the technical defects of the existing technology, this utility model provides an RFID electronic tag with an anti-tamper structure. The detection circuit is weakly coupled to the antenna in the antenna layer to form a parasitic capacitance, which causes a significant shift in the resonant frequency of the antenna. The energy emitted by the reader at the operating frequency cannot be effectively received by the tag antenna, resulting in a sharp decrease in the tag's reading distance or even complete inability to read, thus achieving the anti-tamper function.

[0004] The technical solution adopted by this utility model is: an RFID electronic tag with an anti-tamper structure, including a brittle base, an antenna layer on the surface of the brittle base, a tag chip connected to the antenna layer on the antenna layer, and multiple breakpoints on the antenna layer, the width of the breakpoints being 0.01m;

[0005] The surface of the antenna layer is provided with a top cover layer, and the bottom of the brittle base is provided with an adhesive layer for sticking to an article;

[0006] The bottom of each top cover layer is coated with a fine and continuous conductive ink line to form a grid-like detection circuit.

[0007] Preferably, the detection circuit is weakly coupled to the antenna in the antenna layer, the detection circuit is not connected to the tag chip, an insulating base layer is provided between the antenna layer and the detection circuit, and a parasitic capacitance is formed between the detection circuit and the antenna layer.

[0008] Preferably, the detection circuit is connected to the detection pin in the tag chip.

[0009] Preferably, the antenna layer is etched / printed onto a brittle substrate, and the detection circuit is printed on the bottom of the top cover layer.

[0010] The beneficial effects of this invention are as follows: This invention features an antenna layer on the surface of a brittle base, and a top cover layer on the surface of the antenna layer. The bottom of the top cover layer is coated with a fine and continuous conductive ink line to form a grid-like detection circuit. This detection circuit is weakly coupled to the antenna in the antenna layer, forming a parasitic capacitance. A portion of the fragile grid is designed as a capacitor plate, while a portion of the main antenna acts as another capacitor plate, separated by a thin dielectric layer, thus forming a parasitic capacitance. This parasitic capacitance is part of the antenna tuning circuit and participates in determining the antenna's optimal resonant frequency. At this point, the antenna impedance is well matched, and the reading distance is at its maximum. When the grid is cut off, the value of this carefully designed parasitic capacitance changes abruptly. This directly causes a significant shift in the antenna's resonant frequency. The energy emitted by the reader at its operating frequency cannot be effectively received by the tag antenna, resulting in a sharp decrease in the tag's reading distance, or even complete loss of readability.

[0011] 2. The detection circuit of this utility model is directly connected to the internal detection circuit of the RFID chip through one or two dedicated pins to determine the on / off state of the grid circuit, thus determining whether the tag has been forcibly removed. Attached Figure Description

[0012] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure at the break point of this utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Brittle base; 2. Antenna layer; 3. Tag chip; 4. Breakpoint; 5. Conductive ink circuit; 6. Top cover layer; 7. Adhesive layer; 8. Insulating base layer; 9. VOID layer. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0017] like Figures 1-2 As shown, this embodiment provides an RFID electronic tag with an anti-tamper structure, including a brittle base 1. The surface of the brittle base 1 is provided with an antenna layer 2, and the antenna layer 2 is provided with a tag chip 3 connected to the antenna layer 2. The antenna layer 2 is provided with multiple breakpoints 4, and the width of the breakpoints 4 is 0.01m. This facilitates disassembly by having the top cover layer cause the antenna in the antenna layer to break. The surface of the antenna layer 2 is provided with a top cover layer 6, and the bottom of the brittle base 1 is provided with an adhesive layer 7 for sticking to an item. The bottom of the top cover layer 6 is coated with a layer of fine and continuous conductive ink lines 5 to form a grid-like detection circuit.

[0018] The detection circuit is weakly coupled to the antenna in antenna layer 2 and is not connected to the tag chip 3. An insulating base layer 8 is provided between antenna layer 2 and the detection circuit, forming a parasitic capacitance between them. Antenna layer 2 is provided on the surface of brittle base 1, and a top cover layer 6 is provided on the surface of antenna layer 2. The bottom of the top cover layer 6 is coated with a fine and continuous conductive ink line 5 to form a grid-like detection circuit. The detection circuit is weakly coupled to the antenna in antenna layer 2, forming a parasitic capacitance. A portion of the fragile grid is designed as a capacitor plate, while a portion of the main antenna acts as another capacitor plate, separated by a thin dielectric layer, thus forming a parasitic capacitance. This parasitic capacitance is part of the antenna tuning circuit and participates in determining the optimal resonant frequency of the antenna. At this point, the antenna impedance is well matched, and the reading distance is at its maximum. When the grid is cut off, the value of this carefully designed parasitic capacitance changes abruptly. This directly causes a significant shift in the resonant frequency of the antenna. The energy emitted by the reader at its operating frequency cannot be effectively received by the tag antenna, resulting in a sharp decrease in the tag's reading distance, or even complete unreadability.

[0019] The detection circuit is connected to the detection pins in the tag chip 3. The detection circuit connects directly to the internal detection circuit of the RFID chip via one or two dedicated pins to determine the continuity of the grid circuit, thus determining whether the tag has been forcibly removed. To combine the advantages of both methods, the safest and most intelligent tag will adopt a hybrid mode, where any removal attempt will trigger a dual failure mechanism:

[0020] Mechanism 1 (Physical Level): Mesh Destruction -> Antenna Detuning -> Reading Distance Plummets.

[0021] Mechanism 2 (Logical Level): Mesh corruption -> Chip detects corruption -> Status bit latches as "corrupted".

[0022] The antenna layer is etched / printed onto the brittle base 1, and the detection circuit is printed on the bottom of the top cover layer 6, thus enabling mass production using existing technology.

[0023] The brittle base 1 is made of brittle PET material, which facilitates brittle fracture. The bottom surface of the brittle base 1 is provided with a VOID layer 9. Essentially, the VOID layer 9 is a pre-deployed, hidden "evidence generator." It transforms a potential, possibly concealed physical removal act (simply tearing off a label) into an obvious, undeniable "crime scene." Once triggered, it cannot be reversed, requires no special equipment, is visually identifiable, and leaves evidence on both the item and the label.

[0024] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0025] Working Principle: An antenna layer 2 is provided on the surface of a brittle base 1, and a top cover layer 6 is provided on the surface of the antenna layer 2. The bottom of the top cover layer 6 is coated with a fine and continuous conductive ink line 5 to form a grid-like detection circuit. The detection circuit is weakly coupled to the antenna in the antenna layer 2, forming a parasitic capacitance. A part of the fragile grid is designed as a capacitor plate, and a part of the main antenna acts as another capacitor plate, with a thin dielectric separating the two, thus forming a parasitic capacitance. This parasitic capacitance is part of the antenna tuning circuit and participates in determining the optimal resonant frequency of the antenna. At this time, the antenna impedance is well matched, and the reading distance is the farthest. When the grid is cut off, the value of this carefully designed parasitic capacitance will change abruptly. This directly causes a significant shift in the resonant frequency of the antenna. The energy emitted by the reader at the operating frequency cannot be effectively received by the tag antenna, resulting in a sharp decrease in the tag's reading distance, or even complete failure to read.

[0026] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. An RFID electronic tag having a tamper-evident structure, characterized by: It includes a brittle base (1), the surface of which is provided with an antenna layer (2), and the antenna layer (2) is provided with a tag chip (3) connected to the antenna layer (2), and the antenna layer (2) is provided with multiple breakpoints (4), the width of which is 0.01m; The surface of the antenna layer (2) is provided with a top cover layer (6), and the bottom of the brittle base (1) is provided with an adhesive layer (7) for sticking to the article. The bottom of the top cover layer (6) is coated with a layer of fine and continuous conductive ink lines (5) to form a grid-like detection circuit.

2. The RFID electronic tag with an anti-tamper structure according to claim 1, characterized in that: The detection circuit is weakly coupled to the antenna in the antenna layer (2), the detection circuit is not connected to the tag chip (3), an insulating base layer (8) is provided between the antenna layer (2) and the detection circuit, and a parasitic capacitance is formed between the detection circuit and the antenna layer (2).

3. An RFID electronic tag with an anti-tamper structure according to claim 1, characterized in that: The detection circuit is connected to the detection pin in the tag chip (3).

4. An RFID electronic tag with an anti-tamper structure according to claim 1, characterized in that: The antenna layer is etched / printed onto the brittle substrate (1), and the detection circuit is printed on the bottom of the top cover layer (6).

5. An RFID electronic tag with an anti-tamper structure according to claim 1, characterized in that: The brittle base (1) is made of brittle pet material.

6. An RFID electronic tag with an anti-tamper structure according to claim 1, characterized in that: The bottom surface of the brittle base (1) is provided with a VOID layer (9).

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