Label antenna and preparation method thereof

Abstract

The invention belongs to the field of antenna equipment, and discloses a tag antenna and a preparation method thereof. The tag antenna comprises a substrate and an antenna main body, the antenna main body is arranged on the substrate, and the material of the antenna main body comprises a graphene film. Wherein the material of the antenna main body comprises a graphene film; the graphene film has excellent chemical inertness and excellent conductivity, and can achieve the effects of liquid resistance, corrosion resistance and acid and alkali resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna equipment, and in particular to a tag antenna and a preparation method thereof. Background Art

[0002] Ultra-high frequency radio frequency identification technology has been widely used in smart logistics, industrial automation, asset tracking, medical supplies management and other fields due to its advantages such as long-distance reading, high-speed multi-target recognition capabilities and low cost.

[0003] With the advancement of IoT technology, RFID (Radio Frequency Identification) tags must adapt to increasingly complex and demanding environments, such as chemical production, ocean monitoring, biomedical fluid environments, and industrial environments with strong acids and alkalis. Traditional etched metal antennas face the risk of severe corrosion and oxidation failure in such environments, resulting in reduced communication range and even loss of functionality. While durability can be improved through plastic encapsulation or protective coatings, this increases tag thickness, cost, and makes long-term reliability difficult to guarantee. In summary, existing wireless tag antennas have poor durability. Summary of the Invention

[0004] The main purpose of the present invention is to provide a tag antenna and a preparation method thereof, aiming to solve the problem of poor durability of existing wireless tag antennas.

[0005] To achieve the above object, the present invention provides a tag antenna, comprising:

[0006] substrate; and,

[0007] The antenna body is arranged on the substrate, and the material of the antenna body includes a graphene film to achieve liquid resistance and corrosion resistance.

[0008] In one embodiment, the antenna body includes a port structure, which includes two ring arms arranged at intervals and a connecting arm connecting one end of the two ring arms, and the other ends of the two ring arms are provided with rectangular connection points, and the inner sides of the two rectangular connection points are extended with extension arms, and the line width of the rectangular connection points is set to be larger than the line width of the ring arms.

[0009] In one embodiment, a port gap is formed between the two extension arms, and the width of the port gap is 0.15 mm.

[0010] In one embodiment, dipole arms are provided on the upper sides of the two rectangular connection points, and the dipole arms are bent to form a plurality of straight portions parallel to the ring arms and bent portions parallel to the connection arms.

[0011] In one embodiment, an end loading portion is provided at the end of the dipole arm, the end loading portion is arranged parallel to the ring arm, and the line width of the end loading portion is greater than the line width of the dipole arm.

[0012] In one embodiment, the tag antenna further includes a chip bound to the antenna body.

[0013] In one embodiment, the substrate is a flexible substrate.

[0014] In one embodiment, the thickness of the graphene film is set to 0.05 mm, and the conductivity is set to 10 6 S / m.

[0015] The present invention also provides a method for preparing a tag antenna, comprising the following steps:

[0016] According to the preset correspondence, select the antenna shape corresponding to the chip;

[0017] According to the antenna shape, etching simulation is performed on the graphene film to obtain the antenna body;

[0018] transferring the antenna body onto a substrate;

[0019] The chip is bound to the antenna body and solidified to obtain a tag antenna.

[0020] The present invention provides a tag antenna, comprising a substrate and an antenna body arranged on the substrate, wherein the material of the antenna body comprises a graphene film; the graphene film has excellent chemical inertness and outstanding electrical conductivity, and can achieve the effects of liquid resistance, corrosion resistance, and acid and alkali resistance. At the same time, directly using the graphene film material without packaging can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic structural diagram of a tag antenna provided by a first embodiment of the present invention;

[0022] Figure 2 yes Figure 1 The reading distance test of the tag antenna in different directions inside the mushroom bag;

[0023] Figure 3 yes Figure 1 Reading distance test of the tag antenna after being immersed in 10% concentration HCL and NaOH solution for 14 days;

[0024] Figure 4 A schematic structural diagram of a tag antenna provided by a second embodiment of the present invention;

[0025] Figure 5 yes Figure 4The reading distance test diagram of the tag antenna in four different liquid environments

[0026] Figure 6 yes Figure 4 The tag antenna in the image is soaked in hydrochloric acid for one day and the reading distance is measured at different drying times.

[0027] Description of Figure Numbers:

[0028] 100. Tag antenna; 1. Base; 2. Antenna body; 21. Ring arm; 22. Connecting arm; 23. Rectangular connection point; 24. Extended arm; 25a. Straight portion; 25b. Bend portion; 26. End loading portion;

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] See also Figure 1The present invention provides a tag antenna 100, comprising: a substrate 1 and an antenna body 2; the antenna body 2 is arranged on the substrate 1, and the material of the antenna body 2 includes a graphene film to achieve liquid resistance and corrosion resistance.

[0034] The present invention provides a tag antenna 100, comprising a substrate 1 and an antenna body 2 arranged on the substrate 1, wherein the material of the antenna body 2 comprises a graphene film; the graphene film has excellent chemical inertness and outstanding conductivity, and can achieve the effects of liquid resistance, corrosion resistance, and acid and alkali resistance. At the same time, directly using the graphene film material without packaging can effectively reduce costs.

[0035] After the antenna body 2 is formed by the graphene film, the antenna structure needs to be optimized to ensure that it can realize a strong penetrating and deformation-resistant RFID tag.

[0036] Specifically, in this embodiment, the antenna body 2 includes a port structure, which includes two spaced-apart loop arms 21 and a connecting arm 22 connecting one end of the two loop arms 21. The other ends of the two loop arms 21 are provided with rectangular connection points 23. Extension arms 24 extend from the inner sides of the two rectangular connection points 23, and the line width of the rectangular connection points 23 is set to be larger than the line width of the loop arms 21. In this embodiment, the line width of the rectangular connection points 23 is set to be larger than the line width of the loop arms 21 to enhance current density and ensure stable current transmission between the antenna and the chip during deformation.

[0037] By designing the length and line width of the ring arm 21 and the connecting arm 22, the impedance matching between the antenna and the chip can be adjusted to achieve good antenna gain, so that the tag antenna and the tag chip can be more accurately conjugate matched.

[0038] Furthermore, a port gap is formed between the two extension arms 24 , and the width of the port gap is 0.15 mm.

[0039] The port structure forms a rectangular ring structure and has a rectangular gap, which can adjust the impedance of the tag antenna, offset the impact of the external environment on the impedance of the port structure, and achieve conjugate matching of the impedance, thereby improving the reading performance of the tag and making it easier to be read by a scanning device.

[0040] Furthermore, dipole arms are provided on the upper sides of the two rectangular connection points 23. These dipole arms are bent to form a plurality of straight portions 25a parallel to the loop arms 21, and bent portions 25b parallel to the connection arms 22. To cope with bending and stretching applications, a laterally compact bending structure is adopted, which not only effectively resists deformation but also meets the design concept of miniaturized tags.

[0041] Increasing the number of turns of the dipole arm will increase the current path of the antenna, affecting the impedance of the antenna, usually increasing the imaginary part of the impedance and reducing the real part of the impedance.

[0042] Therefore, further, the end of the dipole arm is provided with an end loading portion 26, which is arranged parallel to the ring arm 21 and has a line width greater than the line width of the dipole arm. In this embodiment, the area of ​​the end loading portion 26 is adjusted to prevent the increase of the imaginary part.

[0043] It should be noted that the length of the terminal loading portion 26 is less than or equal to the length of the ring arm 21 , which not only ensures the area of ​​the terminal loading portion 26 but also ensures the miniaturization design of the antenna body 2 .

[0044] On the other hand, the tag antenna further includes a chip bound to the antenna body.

[0045] In this embodiment, the substrate is a flexible substrate, such as paper, PET or PI, etc., which is not specifically limited here.

[0046] Specifically, in this embodiment, the thickness of the graphene film is set to 0.05 mm, and the conductivity is set to 10 6 S / m.

[0047] Based on the above-mentioned tag antenna 100, the present invention further provides a method for preparing a tag antenna, comprising the following steps:

[0048] S10. Selecting an antenna shape corresponding to the chip according to a preset correspondence relationship;

[0049] S20, etching the graphene film according to the antenna shape to obtain an antenna body by simulation;

[0050] S30, transferring the antenna body onto a substrate;

[0051] S40: Bind the chip to the antenna body and solidify it to obtain a tag antenna.

[0052] Based on the above-mentioned tag antenna and its manufacturing method, the present invention provides the following specific embodiments:

[0053] Example 1:

[0054] The main structure of the antenna design mainly consists of a bent dipole antenna and a matching port structure.

[0055] To cope with bending and stretching applications, a compact, transversely flexed structure is adopted. This not only effectively resists deformation but also meets the design concept of miniaturized tags. Increasing the number of turns in the dipole arm increases the current path of the antenna, affecting the antenna's impedance, typically increasing the imaginary part of the impedance and decreasing the real part.

[0056] Therefore, the area of ​​the end loading of the dipole antenna is adjusted to resist the increase of the imaginary part (by adjusting the length x1 and width l2 of the end loading),

[0057] At the same time, the port connection area is increased to enhance current density, ensuring stable current transmission between the antenna and the chip during deformation. Adjusting the port structure's arm length s1, arm spacing l1, and line width w1 further fine-tunes the impedance matching between the antenna and the chip, achieving optimal antenna gain.

[0058] The antenna shape is designed and adjusted using simulation software. Once the shape is finalized, the antenna model is imported into the laser engraving machine's software. The graphene film is then placed in the designated processing area, and the laser parameters are adjusted for processing. After the laser engraving machine completes processing, the film is removed and the excess graphene film is removed with tweezers, leaving the main antenna. This is then transferred to a pre-coated PET substrate and divided into individual labels of uniform size. The chip is then bonded to the antenna using a flip-chip bonding machine.

[0059] See also Figure 2 The prepared RFID tag antenna was tested for reading distance in a mushroom bag.

[0060] See also Figure 3 ,The RFID tags were placed in 10% concentration HCL and NaOH solutions respectively, and the reading distance test was carried out after the corrosion resistance test.

[0061] Through innovations in materials, structures, and processes, this study provides a solution for the design of high-reliability RFID tags in complex agricultural media environments, which is both environmentally adaptable and economical.

[0062] Among them, the shape parameters x1 is 8 mm, l2 is 17 mm, s1 is 7.75 mm, l1 is 11 mm, and w1 is 1 mm.

[0063] The spawn bag is a common oyster mushroom spawn bag, referred to as POB. The main materials are sawdust, corn cobs, wheat bran and corn flour, etc. It is often placed in a room temperature, humid and dark environment. It is commonly a hollow cylindrical structure with a size of 150×50 mm2, an inner diameter of 15 mm, and a dielectric constant of 2.7.

[0064] It should be noted that the graphene film is made of graphene and related materials (such as graphene nanosheets, graphene oxide and reduced graphene oxide), and has excellent oxidation resistance, corrosion resistance and acid and alkali resistance.

[0065] The thickness of the graphene film is set to 0.05 mm, and the conductivity is set to 106 S / m.

[0066] Example 2:

[0067] See also Figure 4 , simulate the shape of the UHF RFID tag antenna on the electromagnetic simulation software, then adjust the parameters of the tag antenna, set the antenna shape to a rectangle, and make grooves on the graphene film to obtain the simulated antenna shape on the film. Then, use the flip-package operation of the chip bonding machine to bind the preset tag wire piece to the antenna's feed port to obtain a complete UHF RFID tag antenna.

[0068] See also Figure 5 After attaching the graphene film antenna to the surface of a rectangular plastic bottle with a conductivity of 2.3 and a volume of 80 mm × 80 mm × 200 mm, professional instruments were used to test the reading distance of the tag antenna on different liquid substrates, namely empty plastic bottles, plastic water bottles, glass water bottles and plastic cola bottles, to obtain the reading distance test data of the tag antenna.

[0069] Because the rectangular gaps in the graphene film layer adjust the impedance of the tag antenna, they can offset the effect of the bottle's liquid on the antenna port impedance, achieving conjugate matching between the antenna port impedance and the RFID tag, thereby improving the RFID tag's read performance and making it easier for scanning devices to read the RFID tag. In the embodiments of the present application, the rectangular gap size can be set according to the specific type of item, forming a liquid-resistant RFID tag antenna for that item, which can then be attached to the corresponding water bottle to meet impedance matching requirements.

[0070] Among them, the length of w1 is 9 mm, the length of w2 is 4.5 mm, the matching effect between the antenna and the chip is the best, and the port gap is set to 0.15 mm.

[0071] In addition, the substrate can be a flexible substrate, such as paper, PET, etc., which can be used under the conditions of being attached to a bottle or in other uneven environments.

[0072] See also Figure 6 In this embodiment, the reading distance of the RFID tag antenna obtained by etching the graphene film is only reduced by 1.5m after being soaked in hydrochloric acid for one day, meeting the corrosion resistance condition.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A tag antenna, characterized in that: include: substrate; as well as, An antenna body is provided on the substrate, wherein the material of the antenna body includes a graphene film to achieve liquid resistance and corrosion resistance; The antenna body includes a port structure, which includes two ring arms arranged at intervals and a connecting arm connecting one end of the two ring arms. The other ends of the two ring arms are provided with rectangular connection points, and the inner sides of the two rectangular connection points are extended with extension arms, and the line width of the rectangular connection point is set to be larger than the line width of the ring arms.

2. The tag antenna according to claim 1, characterized in that: The upper sides of the two rectangular connection points are both provided with dipole arms, and the dipole arms are bent to form a plurality of straight portions arranged parallel to the ring arms and a bent portion arranged parallel to the connection arm.

3. The tag antenna according to claim 2, characterized in that: An end loading portion is provided at the end of the dipole arm. The end loading portion is arranged in parallel with the ring arm, and the line width of the end loading portion is greater than the line width of the dipole arm.

4. The tag antenna according to claim 1, wherein: The substrate is a flexible substrate.

5. The tag antenna according to claim 1, wherein: The thickness of the graphene film is set to 0.05mm, conductivity is set to 10 6 S / m.

6. A method for preparing a tag antenna according to any one of claims 1 to 5, characterized in that: The following steps are involved: According to the preset correspondence, select the antenna shape corresponding to the chip; According to the antenna shape, etching simulation is performed on the graphene film to obtain the antenna body; transferring the antenna body onto a substrate; The chip is bound to the antenna body and solidified to obtain a tag antenna.

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