Edgeless RFID electronic tag

Abstract

To provide an edgeless RFID electronic tag that does not require an edge to be left on an inlay and can maximize antenna performance in a smaller product size. [Solution] The edgeless RFID electronic tag includes a dielectric substrate, an RFID chip, and an antenna structure 2, 2'. The antenna structure includes a feed loop, a pair of dipole antennas extending in opposite directions from both sides of the feed loop, and a pair of radiating pieces 23, 23' attached to the tips of the dipole antennas. The width of the radiating pieces is greater than the width of the dipole antennas and the width of the feed loop. The edgeless RFID electronic tag is manufactured using a die-cutting process, cutting the outer periphery of the radiating piece along a cutting line 6 without contacting the feed loop or dipole antenna, so that the distance between the outer edge of the radiating piece and the edge of the dielectric substrate is zero.

Description

[Technical Field]

[0001] This utility model relates to the technical field of RFID tags, and in particular to edgeless RFID electronic tags. [Background technology]

[0002] RFID tags based on flexible substrates such as PET can be applied to clothing, retail goods management, and various non-metallic environments including liquids. To avoid cutting down to the antenna or destroying the antenna structure, the antenna size of conventional inlays needs to be at least 1 mm smaller than the product size. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention aims to provide an edgeless RFID tag that can solve the drawback of the need to leave an edge in the conventional inlay. The technical solution is as follows: [Means for solving the problem]

[0004] An edgeless RFID electronic tag including a dielectric substrate, an RFID chip, and an antenna structure, wherein the antenna structure includes a power feed loop, a pair of dipole antennas extending in opposite directions on both sides of the power feed loop, and a pair of radiating pieces provided at the tips of the dipole antennas; the width of the radiating piece is greater than the width of the dipole antenna and the width of the power feed loop, and the edgeless RFID electronic tag product is produced by a die-cutting process, and is formed by cutting the outer periphery of the radiating piece without contacting the power feed loop and the dipole antenna, so that in the product, the distance between the outer edge of the radiating piece and the edge of the dielectric substrate is zero, The edgeless RFID tag further includes an adhesive applied to one side of the antenna structure, and a release paper attached to the adhesive and removed when the tag is used.

[0005] Furthermore, the radiation piece is a plate-like member having a cutout structure.

[0006] Furthermore, the constraints on the antenna structure and the cutting line in the die-cutting process are that the distance between the cutting line and the periphery of the radiating piece is 0.5 mm or more and 2 mm or less, the gap between the cutting line and the cut-out portion of the radiating piece is greater than 0.8 mm, and the gap between the cutting line and the edge of the dipole antenna and the edge of the feed loop is greater than 0.5 mm.

[0007] Furthermore, the cutting frame formed by the cutting lines is a rectangular frame.

[0008] Furthermore, the overall shape of the radiation piece is rectangular, and the shape of the cutout structure of the radiation piece is approximately rectangular.

[0009] Furthermore, the dipole antenna is a dipole antenna having a meandering structure.

[0010] Furthermore, the lengths of the folded portions of the dipole antenna are not equal.

[0011] Furthermore, the shape of the power feeding loop is a substantially rectangular loop. [Effects of the Invention]

[0012] Compared to the prior art, this utility model has the notable feature of solving the drawback of needing to leave an edge on conventional inlays, and maximizing antenna performance in a smaller product size. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram of a conventional inlay RFID electronic tag. [Figure 2] 1 is a schematic diagram of the antenna structure of the edgeless RFID electronic tag of the present invention before cutting. [Figure 3] 1 is a schematic diagram of the laminated structure of the edgeless RFID electronic tag of the present invention. [Figure 4] 1 is a schematic cutaway view of the edgeless RFID electronic tag product of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] To further explain each embodiment, the present invention provides drawings. These drawings are part of the disclosure of the present invention and are primarily intended to explain the embodiments, and together with the relevant descriptions in the specification, can explain the operating principles of the embodiments. By referring to these contents, those skilled in the art should be able to understand other possible embodiments and the advantages of the present invention. The elements in the drawings are not drawn to scale. Generally, similar element reference numerals are used to indicate similar elements.

[0015] The present utility model will now be further described with reference to the drawings and specific embodiments.

[0016] As shown in Figures 2, 3 and 4, the present invention provides an embodiment of an edgeless RFID electronic tag that can be applied to clothing, retail goods management, and various non-metallic environments including liquids.

[0017] In this embodiment, the edgeless RFID electronic tag is applied to the ultra-high frequency UHF band (for example, 860 MHz to 960 MHz).

[0018] As shown in Figure 2, this edgeless RFID electronic tag consists of a dielectric substrate 1, an antenna structure 2, an RFID chip 3, an adhesive 4, and a release paper 5, and the RFID chip 3 and the antenna structure 2 are bonded together with a conductive adhesive, providing electrical continuity. In this electronic tag, the adhesive 4 is applied to the antenna structure 2 side. The release paper 5 is attached to the adhesive 4 and is removed when the electronic tag is used. The side of the electronic tag on which the antenna structure 2 is provided is directly adhered to an attachment via the adhesive 4, and the RFID chip 3 and antenna structure 2 are protected by the dielectric substrate 1 and the attachment.

[0019] 3, the antenna structure 2 comprises a feed loop 21, a pair of dipole antennas 22 extending in opposite directions on either side of the feed loop 21, and a pair of radiating pieces 23 located at the tips of the dipole antennas 22. The connection points between the dipole antennas 22 and the feed loop 21 are located at the midpoints on either side of the feed loop 21, so that the antenna has a relatively balanced bandwidth, impedance matching, and gain. By adjusting the size of the feed loop 21, the impedance matching effect between the antenna structure 2 and the RFID chip 3 can be adjusted to improve the antenna performance of the electronic tag.

[0020] In this embodiment, the shape of the power feeding loop 21 is a substantially rectangular loop, and the RFID chip 3 can efficiently acquire energy from the electromagnetic field in the air.

[0021] In this embodiment, the lengths of the folded portions of the dipole antenna 22 are not equal, which can optimize the radiation efficiency of the antenna to some extent.

[0022] In this embodiment, the radiating piece 23 has a rectangular structure, and the shape of the internal cutout structure 231 is approximately rectangular. The shape of the cutout structure 231 can be designed as needed, including but not limited to a rectangle. The cutout radiating piece 23 can effectively reduce current reflection at the antenna tip, thereby improving the input impedance characteristics of the antenna, widening the antenna's operating frequency band, and making the antenna more adaptable to various usage environments, including liquids.

[0023] As shown in Figure 3, the width of the radiating piece 23 in the antenna structure 2 is larger than the width of the dipole antenna 22 and the width of the feed loop 21. This allows for cutting the periphery of the radiating piece 23 to form the antenna structure 2' during fabrication into a product. By making the size of the antenna structure 2' equal to the product size (i.e., the distance between the outer edge of the radiating piece 23' of the antenna structure 2' and the edge of the dielectric substrate 1 is zero), antenna performance is maximized. This method overcomes the drawback of needing to leave an edge in a conventional inlay. That is, to avoid cutting into the antenna or destroying the antenna structure, the size of the antenna structure in a conventional inlay must be at least 1 mm smaller than the size of the dielectric substrate.

[0024] In a specific application, the distance between the cutting line 6 and the cutout structure 231 is greater than 0.8 mm, and the distance between the cutting line 6 and the dipole antenna 22 and the feed loop 21 is greater than 0.5 mm to avoid damaging the antenna structure. From the viewpoint of saving materials, the distance that the edge of the radiating piece 23 extends beyond the cutting line 6 is preferably greater than 0.5 mm and less than 2 mm.

[0025] In the example of this embodiment, the size of the antenna structure 2 of this ultra-high frequency electronic tag is 38mm x 18mm before cutting, and when applied, the product size (i.e., the size of the antenna structure 2') can be cut to a minimum of 35mm x 15mm.

[0026] The type of dielectric substrate 1 can be selected depending on the usage environment (e.g., temperature, humidity), such as transparent PET, milky white PET, paper substrate, or nylon cloth (PA). The type of adhesive 4 can be selected depending on the usage environment, such as acrylic gel or waterproof jelly. The release paper 5 is preferably made of glassine, which is suitable for die-cutting. The antenna structure 2 may be made of aluminum, copper, silver paste, or the like, and can be formed on the dielectric substrate 1 by etching, printing, or other processes. The RFID chip 3 and the antenna structure 2 can be connected by a conductive adhesive or direct soldering. The shape of the cutting frame formed by the cutting line 6 can be designed as needed and is usually rectangular.

[0027] Although the present utility model has been specifically shown and introduced by combining preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present utility model in form and detail without departing from the spirit and scope of the present utility model as defined by the appended claims, and all such changes are within the scope of protection of the present utility model.

Claims

1. An edgeless RFID electronic tag including a dielectric substrate, an RFID chip, and an antenna structure, the antenna structure includes a feed loop, a pair of dipole antennas extending in opposite directions on both sides of the feed loop, and a pair of radiating pieces provided at tips of the dipole antennas, the width of the radiating piece is greater than the width of the dipole antenna and the width of the power feeding loop, and the edgeless RFID electronic tag product is produced by a die cutting process, and is formed by cutting the outer periphery of the radiating piece without contacting the power feeding loop and the dipole antenna, so that in the product, the distance between the outer edge of the radiating piece and the edge of the dielectric substrate is zero, The edgeless RFID tag further includes an adhesive applied to one side of the antenna structure, and a release paper attached to the adhesive and removed when the tag is used. An edgeless RFID electronic tag.

2. The radiation piece is a plate-shaped member having a cutout structure.

2. The edgeless RFID electronic tag according to claim 1.

3. The overall shape of the radiation piece is rectangular, and the shape of the cutout structure of the radiation piece is approximately rectangular.

3. The edgeless RFID electronic tag according to claim 2.

4. The constraints on the antenna structure and the cutting lines in the die-cutting process are that the distance between the cutting lines and the periphery of the radiation piece is 0.5 mm or more and 2 mm or less, the interval between the cutting lines and the cut-out structure of the radiation piece is greater than 0.8 mm, and the interval between the cutting lines and the edge of the dipole antenna and the edge of the feed loop is greater than 0.5 mm.

3. The edgeless RFID electronic tag according to claim 2.

5. The cutting frame formed by the cutting lines is a rectangular frame.

3. The edgeless RFID electronic tag according to claim 2.

6. The dipole antenna is a dipole antenna having a serpentine structure.

2. The edgeless RFID electronic tag according to claim 1.

7. The lengths of the folded portions of the dipole antenna are not equal.

7. The edgeless RFID electronic tag according to claim 6.

8. The shape of the power supply loop is a substantially rectangular loop.

2. The edgeless RFID electronic tag according to claim 1.

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