Radio frequency identification (RFID) tag capable of rapidly switching working frequency bands

Abstract

The utility model belongs to the technical field of radio frequency tags, and particularly relates to an RFID tag capable of rapidly switching working frequency bands. The utility model comprises: a plane material layer; the first adhesive layer is arranged on the bottom surface of the surface material layer; the antenna layer is arranged on the bottom surface of the first adhesive layer, the antenna layer comprises an antenna and a frequency modulation coil, the antenna comprises an inductance coil and a pair of dipole antenna arms uniformly distributed on two sides of the inductance coil, a chip is bound on the inductance coil, the frequency modulation coil is in the range of the inductance coil, and the frequency modulation coil is not closed; and the second adhesive layer is arranged on the bottom surface of the antenna layer. The RFID tag is used for solving the technical problems that although the RFID tag in the prior art can meet the use environment requirements of European / American standards, the actual communication performance of the RFID tag is poor, and the working requirements are difficult to meet.

Description

Technical Field

[0001] The utility model belongs to the technical field of radio frequency tags, and in particular relates to an RFID tag capable of rapidly switching working frequency bands. Background Art

[0002] Ultra-high frequency (UHF) RFID tags are widely used in logistics, warehousing, asset management, and other fields. Due to their long-range reading capabilities and high speed, they are extremely useful in scenarios where large numbers of items need to be quickly identified and tracked. For example, in logistics centers, UHF RFID tags can be used to quickly scan goods, improving logistics efficiency.

[0003] At present, the ultra-high frequency bands on the market are roughly divided into European standard 865-868MHz, American standard 902-928MHz and national standard 920-925MHz based on product characteristics. The American standard includes the national standard. This article only discusses the two frequency bands with large differences between the European standard and the American standard.

[0004] When designing UHF RFID tags, it's usually determined in advance whether they will be used in a US or European environment. If necessary, tags may be designed to accommodate both US and European standards, even at the expense of communication performance. However, compared to US or European RFID tags designed for a single operating environment, these tags often offer inferior performance and are unlikely to meet the requirements. Utility Model Content

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide an RFID tag that can quickly switch the working frequency band, so as to solve the technical problem that the RFID tags in the existing technology, although they can take into account the use environment requirements of European / American standards, have poor actual communication performance and are difficult to meet the working requirements.

[0006] The present invention solves the above-mentioned technical problems with the following technical solutions: an RFID tag capable of rapidly switching operating frequency bands, comprising:

[0007] Surface material layer;

[0008] a first adhesive layer, the first adhesive layer being provided on the bottom surface of the surface material layer;

[0009] an antenna layer, the antenna layer being disposed on the bottom surface of the first adhesive layer, the antenna layer comprising an antenna and an FM coil, the antenna comprising an inductor coil and a pair of dipole antenna arms evenly distributed on both sides of the inductor coil, the inductor coil being bounded with a chip, the FM coil being within the range of the inductor coil, and the FM coil being not closed;

[0010] A second adhesive layer is provided on the bottom surface of the antenna layer.

[0011] In actual needs, the American standard frequency band has many application scenarios; therefore, in the present invention, the FM coil is used to change the working frequency band of the original antenna to make it conform to the American standard working frequency band. When the use environment is the European standard environment, you only need to tear off the FM coil inside the inductor coil to make the antenna adapt to the European standard working frequency band.

[0012] Furthermore: a base material layer is further provided on the bottom surface of the antenna layer, the antenna of the antenna layer is provided on the top surface of the base material layer through a third adhesive layer, and the FM coil of the antenna layer is provided on the bottom surface of the base material layer through a fourth adhesive layer.

[0013] The beneficial effect of this step is that the antenna and the FM coil are separated by the substrate layer, so that the FM coil is on the outer layer, which is easier to peel off separately, and the substrate layer can also protect the antenna.

[0014] Furthermore: the center point of the frequency modulation coil coincides with the center point of the inductor coil.

[0015] The beneficial effect of this step is that the FM coil and the inductor coil are both regular in shape. When the center points of the two coincide, the distance between the FM coil and the inductor coil is balanced, making the overall performance of the RFID tag more stable.

[0016] Furthermore: the opening of the frequency modulation coil is aligned with the opening of the inductor coil.

[0017] The beneficial effect of adopting this step is: since the opening of the inductor coil is used to bind the chip, and the opening of the FM coil is aligned with the opening of the inductor coil, the influence of the FM coil on the electromagnetic waves of the inductor coil is also the most balanced.

[0018] Furthermore: a release paper is provided on the bottom surface of the second adhesive layer.

[0019] The beneficial effect of this step is that the release paper can cover the second adhesive layer, so that the RFID tags will not stick to each other during production, transportation after slitting, and use.

[0020] The beneficial effects of the utility model are:

[0021] 1. This application forms an RFID tag that complies with the US standard operating frequency band by installing an FM coil in the antenna. After removing the FM coil, the RFID tag complies with the European standard operating frequency band. The two forms of the RFID tag of this application do not lose some communication performance like the compatible tags in the prior art.

[0022] 2. Since the American standard working frequency band has many application scenarios, while the European standard working frequency band has fewer application scenarios, the existing structure of this application is mainly based on the American standard working frequency band. The FM coil needs to be torn off only in the European standard working frequency band. Therefore, this RFID tag rarely needs to tear off the FM coil additionally, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the structure of an RFID tag that can quickly switch working frequency bands provided by the utility model;

[0025] Figure 2 This is a structural diagram of another embodiment of an RFID tag capable of rapidly switching operating frequency bands provided by the present invention;

[0026] Figure 3 This is a schematic diagram of the positions of the antenna and FM coil that can quickly switch the working frequency band provided by the utility model.

[0027] Reference numerals:

[0028] 1-surface material layer; 2-first adhesive layer; 3-antenna; 4-chip; 5-FM coil; 6-second adhesive layer; 7-surface of the object to be attached; 8-base material layer; 9-third adhesive layer; 10-fourth adhesive layer. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0030] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this utility model, "plurality" means more than two, unless otherwise specifically defined.

[0033] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0034] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] Example

[0036] like Figure 1 As shown, the present invention provides an RFID tag capable of quickly switching operating frequency bands, comprising:

[0037] Surface material layer 1;

[0038] A first adhesive layer 2, the first adhesive layer 2 being provided on the bottom surface of the surface material layer 1;

[0039] The antenna layer is provided on the bottom surface of the first adhesive layer 2. The antenna layer includes an antenna 3 and an FM coil 5. The antenna 3 includes an inductor coil and a pair of dipole antenna arms evenly distributed on both sides of the inductor coil. The inductor coil is bound with a chip 4. The FM coil 5 is within the range of the inductor coil and is not closed.

[0040] The second adhesive layer 6 is provided on the bottom surface of the antenna layer and is used for bonding to the surface 7 of the object to be attached.

[0041] The frequency of an RFID tag is typically determined by the ring-shaped inductor coil. The ring's shape (square, circular, or oval), size, thickness, and placement within antenna 3 (centered, slightly above, or slightly below) all have varying effects. After the design is complete, testing the RFID tag with professional testing equipment yields a nearly "V"-shaped curve. The frequency band where the lowest point of the "V" falls represents the optimal frequency for the tag. For example, for the American standard, the lowest point of the "V" falls between 902 and 928 MHz on the horizontal axis. Similarly, for the European standard, it falls between 865 and 868 MHz.

[0042] After testing, this applicant found that placing an additional loop (FM coil 5) within a complete RFID tag loop (inductor) can affect the frequency. Through experiments on various American standard designs, it was found that using tape or other means to superimpose a single, unclosed loop (FM coil 5) on the existing RFID tag loop (inductor) can indeed shift the existing tag's frequency to the left or right. The specific amount of change depends on other parameters such as the actual size or thickness of the superimposed loop.

[0043] Then in actual needs, there are more application scenarios for the American standard frequency band; therefore, in the present invention, the FM coil 5 is used to change the working frequency band of the original antenna to make it conform to the American standard working frequency band. When the use environment is the European standard environment, you only need to tear off the FM coil 5 inside the inductor coil to make the antenna 3 adapt to the European standard working frequency band.

[0044] like Figure 2 As shown, a base material layer 8 is further provided on the bottom surface of the antenna layer, the antenna 3 of the antenna layer is arranged on the top surface of the base material layer 8 through a third adhesive layer 9, and the FM coil 5 of the antenna layer is arranged on the bottom surface of the base material layer 8 through a fourth adhesive layer 10.

[0045] The antenna 3 is separated from the FM coil 5 by the substrate layer 8 , so that the FM coil 5 is located on the outer layer, making it easier to peel off separately. The substrate layer 8 can also protect the antenna 3 .

[0046] On the basis of the above technical solution, the center point of the frequency modulation coil 5 coincides with the center point of the inductor coil.

[0047] The FM coil 5 and the inductor coil are both of regular shape. When their center points coincide (coincidence is for the convenience of subsequent process production, and it is not necessary to coincide. The reason why they are shown as coincidence in the provided drawings is because the simplicity of production aspects such as processing technology has been considered in advance. If the FM coil 5 is attached crookedly or too close to one side of the inductor coil, it will cause a certain deviation from the design expectation. If it is placed in the middle, the accuracy of composite pasting will be better whether it is positioning point positioning or machine vision recognition), the distance between the FM coil 5 and the inductor coil is balanced, making the overall performance of the RFID tag more stable and more beautiful.

[0048] On the basis of the above technical solution, the opening of the frequency modulation coil 5 is aligned with the opening of the inductor coil.

[0049] Since the opening of the inductor coil is used to bind the chip, and the opening of the FM coil 5 is aligned with the opening of the inductor coil, the influence of the FM coil 5 on the electromagnetic waves of the inductor coil is also the most balanced.

[0050] On the basis of the above technical solution, the bottom surface of the second adhesive layer 6 is provided with release paper.

[0051] The release paper can cover and protect the second adhesive layer 6, so that the RFID tags will not stick to each other during the production of rolls, transportation after slitting, and use.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An RFID tag capable of rapidly switching operating frequency bands, characterized in that: include: Surface material layer; a first adhesive layer, the first adhesive layer being provided on the bottom surface of the surface material layer; an antenna layer, the antenna layer being disposed on the bottom surface of the first adhesive layer, the antenna layer comprising an antenna and an FM coil, the antenna comprising an inductor coil and a pair of dipole antenna arms evenly distributed on both sides of the inductor coil, the inductor coil being bounded with a chip, the FM coil being within the range of the inductor coil, and the FM coil being not closed; A second adhesive layer is provided on the bottom surface of the antenna layer.

2. The RFID tag capable of rapidly switching operating frequency bands according to claim 1, characterized in that: A base material layer is further provided on the bottom surface of the antenna layer. The antenna of the antenna layer is provided on the top surface of the base material layer through a third adhesive layer. The FM coil of the antenna layer is provided on the bottom surface of the base material layer through a fourth adhesive layer.

3. The RFID tag capable of rapidly switching operating frequency bands according to claim 1 or 2, characterized in that: The center point of the frequency modulation coil coincides with the center point of the inductor coil.

4. The RFID tag capable of rapidly switching operating frequency bands according to claim 3, characterized in that: The opening of the frequency modulation coil is aligned with the opening of the inductor coil.

5. The RFID tag capable of rapidly switching operating frequency bands according to claim 4, characterized in that: The bottom surface of the second adhesive layer is provided with release paper.

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