Edge-free RFID electronic tag

Abstract

The invention 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 the 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] The invention relates to the technical field of RFID tags, and in particular to a borderless RFID electronic tag. Background Art

[0002] RFID tags based on flexible substrates such as PET can be used in clothing, retail product management, and in a variety of non-metallic environments including liquids. To avoid cutting the antenna and damaging the antenna structure, the antenna size of the traditional white label (inlay) needs to be reduced by no less than 1mm in the finished product size. Summary of the invention

[0003] The present invention aims to provide a borderless RFID electronic tag, which can solve the disadvantage that the traditional white label needs to leave edges. The technical solution is as follows:

[0004] A borderless RFID electronic tag comprises a dielectric substrate, an RFID chip and an antenna structure, wherein the antenna structure comprises: a feeding ring, a pair of dipole antennas distributed on both sides of the feeding ring, and a pair of radiating plates arranged at the ends of the dipole antennas;

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

[0006] Furthermore, the radiation sheet is a hollow plate-like structure.

[0007] Furthermore, in the die-cutting process, the spacing between the hollow portion of the radiation sheet and the cutting line is not less than 0.8 mm, and the spacing between the edge of the dipole antenna, the edge of the feeding ring and the cutting line is not less than 0.5 mm.

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

[0009] Furthermore, the pattern of the radiation sheet is a rectangle; the pattern of the hollow portion of the radiation sheet is approximately a rectangle.

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

[0011] Furthermore, each folded section of the dipole antenna adopts a non-equal length structure.

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

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

[0014] Compared with the prior art, the present invention has the following notable features: it solves the disadvantage that the traditional white label needs to leave edges, and can maximize the antenna performance in a smaller product size. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 It is a schematic diagram of the antenna structure of the borderless RFID electronic tag of the present invention before cutting;

[0017] Figure 3 It is a schematic diagram of the stacked structure of the borderless RFID electronic tag of the present invention;

[0018] Figure 4 It is a schematic diagram of cutting a finished product of the borderless RFID electronic tag of the present invention. DETAILED DESCRIPTION

[0019] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which 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 contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures 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 with reference to the accompanying drawings and specific implementation methods.

[0021] like Figure 2 , Figure 3 and Figure 4 As shown, the present invention provides an embodiment of a borderless RFID electronic tag, which can be applied to clothing, retail commodity management, and a variety of different non-metallic environments including liquids.

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

[0023] like Figure 2As shown, the borderless RFID electronic tag is composed of a dielectric substrate 1, an antenna structure 2, an RFID chip 3, glue 4 and a release paper 5. The RFID chip 3 and the antenna structure 2 are connected and conducted by a conductive glue. In this electronic tag, the glue 4 is applied to one side of the antenna structure 2. When in use, the release paper 5 is removed, and one side of the antenna structure 2 of this electronic tag is directly attached to an object through the glue 4, and the RFID chip 3 and the antenna structure 2 are protected by the dielectric substrate 1 and the attached object.

[0024] like Figure 3 As shown, the shape of the antenna structure 2 is composed of a feed ring 21, a dipole antenna 22 and a radiation plate 23 at the end. The connection point between the dipole antenna 22 and the feed ring 21 is at the middle point on both sides of the feed ring 21. At this time, the antenna is in a relatively more balanced state in terms of bandwidth, impedance matching and gain. The impedance matching effect of the antenna structure 2 and the RFID chip 3 can be adjusted by adjusting the size of the feed ring 21 to improve the antenna performance of the electronic tag.

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

[0026] In this embodiment, the folded sections 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 radiation sheet 23 is a rectangular structure, and the hollow portion 231 inside is approximately rectangular. It should be noted that the shape of the pattern of the hollow portion 231 can be designed as needed, including but not limited to a rectangle. The hollow radiation sheet 23 can effectively reduce the reflection of the current at the end of the antenna, thereby improving the input impedance characteristics of the antenna, broadening the working frequency band of the antenna, and making the antenna easier to adapt to various use environments including liquids in applications.

[0028] like Figure 3 As shown, the width of the radiation plate 23 in the antenna structure 2 is greater than the width of the dipole antenna 22, and greater than the width of the feed ring 21, so that the periphery of the radiation plate 23 can be cut to form the antenna structure 2' when the finished product is made, so that the size of the antenna structure 2' is equal to the size of the finished product (the distance between the outer edge of the radiation plate 23' of the antenna structure 2' and the edge of the dielectric substrate 1 is zero), thereby maximizing the antenna performance. This method can solve the disadvantage of the traditional white label (inlay) that the edge needs to be left: in order to avoid cutting the antenna and damaging the antenna structure, the size of the antenna structure of the traditional white label needs to be reduced by not less than 1mm under the size of the dielectric substrate.

[0029] In a specific application, the distance between the cutting line 6 and the hollow portion 231 is not less than 0.8 mm, and the distance between the dipole antenna 22 and the feeding ring 21 is not less than 0.5 mm, so as to avoid damage to the antenna structure.

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

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

[0032] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are 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 comprises: a feeding ring, a pair of dipole antennas distributed on both sides of the feeding ring, and a pair of radiating plates arranged at the 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 feeding ring. The finished product of the borderless RFID electronic tag is formed by a die-cutting process, in which the periphery of the radiation sheet is cut without touching the feeding ring and the dipole antenna. In the finished product, the distance between the outer edge of the radiation sheet and the edge of the dielectric substrate is zero.

2. The borderless RFID electronic tag according to claim 1, characterized in that: The radiation sheet is a hollow plate structure.

3. The borderless RFID electronic tag according to claim 2, characterized in that: The pattern of the radiation sheet is a rectangle; the pattern of the hollow portion of the radiation sheet is approximately a rectangle.

4. The borderless RFID electronic tag according to claim 2, characterized in that: In the die-cutting process, the distance between the hollow part of the radiation 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 feeding ring and the cutting line is not less than 0.5 mm.

5. The borderless RFID electronic tag according to claim 2, characterized in that: The cutting frame surrounded by the cutting lines is a rectangular frame.

6. The borderless RFID electronic tag according to claim 1, characterized in that: The dipole antenna is a serpentine structure.

7. The borderless RFID electronic tag according to claim 5, characterized in that: Each folded section of the dipole antenna adopts a non-equal length structure.

8. The borderless RFID electronic tag according to claim 1, characterized in that: The pattern of the feeding ring is approximately a rectangular ring.

9. The borderless RFID electronic tag according to any one of claims 1 to 8, characterized in that: It also includes glue and release paper. The glue is coated on one side of the antenna structure, and the release paper is attached to the glue and is removed when the borderless RFID electronic tag is used.

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