Edge-free RFID electronic tag

Abstract

The utility model relates to the field of RFID electronic tags, and discloses a borderless RFID electronic tag, which comprises a dielectric substrate, an RFID chip and an antenna structure, and is characterized in that the antenna structure comprises a feed ring, a pair of dipole antennas distributed on two sides of the feed ring, and a pair of radiation sheets arranged at the tail ends of the dipole antennas; the width of the radiation sheet is greater than the width of the dipole antenna and greater than the width of the feed ring; a finished product of the edgeless RFID electronic tag adopts a die cutting process, the periphery of the radiation sheet is cut to form the edgeless RFID electronic tag under the condition that the feed ring and the dipole antenna are not touched, and in the finished product, the distance between the outer edge of the radiation sheet and the edge of the dielectric substrate is zero. The tag overcomes the defect that the edge of a traditional white tag needs to be reserved, and the antenna performance can be brought into full play on the smaller product size.

Description

Technical Field

[0001] This utility model relates to the field of RFID tag technology, and in particular to a borderless RFID electronic tag. Background Technology

[0002] RFID electronic tags based on flexible substrates such as PET can be applied to clothing and retail merchandise management, as well as various non-metallic environments including liquids. To avoid cutting the antenna and damaging its structure, the antenna size of traditional white tags (inlay) needs to be reduced by at least 1mm in the finished product size. Utility Model Content

[0003] This utility model aims to provide a borderless RFID electronic tag, which solves the problem of traditional white tags requiring an edge. The technical solution is as follows:

[0004] A borderless RFID electronic tag includes a dielectric substrate, an RFID chip, and an antenna structure, characterized in that the antenna structure includes: a feed ring, a pair of dipole antennas distributed on both sides of the feed ring, and a pair of radiating plates disposed at the ends of the dipole antennas;

[0005] The width of the radiating sheet is greater than the width of the dipole antenna and also greater than the width of the feed ring. The finished product of the borderless RFID electronic tag is formed by die-cutting, which cuts the periphery of the radiating sheet without touching the feed ring and the dipole antenna. In the finished product, the distance between the outer edge of the radiating sheet and the edge of the dielectric substrate is zero.

[0006] Furthermore, the radiating sheet has a hollowed-out plate-like structure.

[0007] Furthermore, in the die-cutting process, the distance between the hollowed-out portion of the radiating sheet and the cutting line is not less than 0.8 mm, and the distance between the edge of the dipole antenna, the edge of the feed ring, and the cutting line is not less than 0.5 mm.

[0008] Furthermore, the cutting frame enclosed by the cutting lines is a rectangular frame.

[0009] Furthermore, the pattern of the radiating sheet is rectangular; the pattern of the hollowed-out portion of the radiating sheet is approximately rectangular.

[0010] Furthermore, the dipole antenna has a serpentine structure.

[0011] Furthermore, the folded segments of the dipole antenna adopt a non-equal length structure.

[0012] Furthermore, the pattern of the power supply ring is approximately a rectangular ring.

[0013] Furthermore, the borderless RFID electronic tag also includes adhesive and release paper. The adhesive is coated on one side of the antenna structure, and the release paper is attached to the adhesive and removed when the borderless RFID electronic tag is applied.

[0014] Compared with the prior art, the significant feature of this utility model is that it solves the disadvantage of the traditional white label requiring the margin to be left, and can maximize the antenna performance in a smaller product size. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a traditional white-label RFID electronic tag;

[0016] Figure 2 This is a schematic diagram of the antenna structure of the borderless RFID electronic tag of this utility model before cutting;

[0017] Figure 3 This is a schematic diagram of the stacked structure of the borderless RFID electronic tag of this utility model;

[0018] Figure 4 This is a schematic diagram of the finished product cutting of the borderless RFID electronic tag of this utility model. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides an embodiment of a borderless RFID electronic tag, which can be applied to clothing and retail merchandise management, as well as to various non-metallic environments including liquids.

[0022] In this embodiment, the borderless RFID electronic tag is suitable for the ultra-high frequency (UHF) band (such as 860MHz-960MHz).

[0023] like Figure 2As shown, this borderless RFID electronic tag consists of a dielectric substrate 1, an antenna structure 2, an RFID chip 3, adhesive 4, and release paper 5. The RFID chip 3 and the antenna structure 2 are bonded and connected by conductive adhesive. In this electronic tag, adhesive 4 is applied to one side of the antenna structure 2. During use, the release paper 5 is removed, and the side of the electronic tag with the antenna structure 2 is directly attached to the substrate via adhesive 4. The dielectric substrate 1 and the substrate provide protection for the RFID chip 3 and the antenna structure 2.

[0024] like Figure 3 As shown, antenna structure 2 consists of a feed loop 21, a dipole antenna 22, and a radiating plate 23 at the end. The connection point between the dipole antenna 22 and the feed loop 21 is at the midpoint between the two sides of the feed loop 21. At this point, the antenna is in a state where bandwidth, impedance matching, and gain are relatively more balanced. The impedance matching effect between antenna structure 2 and RFID chip 3 can be adjusted by changing the size of the feed loop 21 to improve the antenna performance of the electronic tag.

[0025] In this embodiment, the pattern of the power supply ring 21 is approximately a rectangular ring, which can effectively obtain the energy of the electromagnetic field in the air and supply it to the RFID chip 3.

[0026] In this embodiment, the folded segments of the dipole antenna 22 adopt a non-equal length structure, which can optimize the radiation efficiency of the antenna to a certain extent.

[0027] In this embodiment, the radiating plate 23 has a rectangular structure, and the internal hollow portion 231 is approximately rectangular. It should be noted that the shape of the pattern in the hollow portion 231 can be designed as needed, including but not limited to rectangles. The hollowed-out radiating plate 23 effectively reduces current reflection at the antenna end, thereby improving the antenna's input impedance characteristics, widening the antenna's operating bandwidth, and making the antenna more adaptable to various application environments, including those involving liquids.

[0028] like Figure 3 As shown, the width of the radiating plate 23 in antenna structure 2 is greater than the width of the dipole antenna 22 and also greater than the width of the feed ring 21. Therefore, during the manufacturing process, the periphery of the radiating plate 23 can be cut to form antenna structure 2', making the size of antenna structure 2' equal to the finished product size (the distance between the outer edge of the radiating plate 23' of antenna structure 2' and the edge of the dielectric substrate 1 is zero), thereby maximizing antenna performance. This method solves the drawback of traditional white label (inlay) antennas requiring an edge: to avoid cutting the antenna and damaging the antenna structure, the size of traditional white label antenna structures needs to be reduced by at least 1 mm from the size of the dielectric substrate.

[0029] In practical applications, the distance between the cutting line 6 and the hollowed-out portion 231 shall not be less than 0.8 mm; and the distance between the dipole antenna 22 and the feed ring 21 shall not be less than 0.5 mm, in order to avoid damage to the antenna structure.

[0030] In this example, before cutting, the antenna structure 2 of the UHF electronic tag is 38mm*18mm in size. When applied, the product size (i.e. the size of the antenna structure 2') can be cut down to a minimum of 35mm*15mm.

[0031] It should be noted that: the type of dielectric substrate 1 can be selected according to the environment (such as temperature and humidity), such as transparent PET, milky white PET, paper substrate, nylon cloth (PA), etc. The type of adhesive 4 can be selected according to the environment, such as acrylic adhesive, waterproof adhesive, etc. Release paper 5 is preferably glassine release paper, suitable for die cutting. The material of antenna structure 2 can be aluminum, copper, silver paste, etc., and can be formed on dielectric substrate 1 through etching or printing processes. The connection method between RFID chip 3 and antenna structure 2 can be conductive adhesive connection or direct welding, etc. The shape of the cutting frame corresponding to the cutting line 6 can be designed as needed, usually rectangular.

[0032] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A borderless RFID electronic tag, comprising a dielectric substrate, an RFID chip, and an antenna structure, characterized in that, The antenna structure includes: a feed ring, a pair of dipole antennas distributed on both sides of the feed ring, and a pair of radiating plates disposed at the ends of the dipole antennas; The width of the radiating sheet is greater than the width of the dipole antenna and also greater than the width of the feed ring. The finished product of the borderless RFID electronic tag is formed by die-cutting, which cuts the periphery of the radiating sheet without touching the feed ring and the dipole antenna. In the finished product, the distance between the outer edge of the radiating sheet and the edge of the dielectric substrate is zero.

2. The borderless RFID electronic tag as described in claim 1, characterized in that, The radiating sheet has a hollowed-out plate-like structure.

3. The borderless RFID electronic tag as described in claim 2, characterized in that, The pattern of the radiating sheet is rectangular; the pattern of the hollowed-out part of the radiating sheet is approximately rectangular.

4. The borderless RFID electronic tag as described in claim 2, characterized in that, In the die-cutting process, the distance between the hollowed-out portion of the radiating sheet and the cutting line is not less than 0.8 mm, and the distance between the edge of the dipole antenna, the edge of the feed ring and the cutting line is not less than 0.5 mm.

5. The borderless RFID electronic tag as described in claim 4, characterized in that, The cutting frame formed by the cutting lines is a rectangular frame.

6. The borderless RFID electronic tag as described in claim 1, characterized in that, The dipole antenna has a serpentine structure.

7. The borderless RFID electronic tag as described in claim 6, characterized in that, The folded segments of the dipole antenna adopt a non-equal length structure.

8. The borderless RFID electronic tag as described in claim 1, characterized in that, The pattern of the feed ring is approximately a rectangular ring.

9. The borderless RFID electronic tag as described in any one of claims 1-8, characterized in that, It also includes adhesive and release paper, the adhesive being coated on one side of the antenna structure and the release paper being attached to the adhesive and removed when the borderless RFID electronic tag is applied.

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