Edgeless RFID electronic tags

Abstract

This technology solves the drawback of conventional inlays that require edges to be left behind, providing edgeless RFID electronic tags that maximize antenna performance in a smaller product size. [Solution] The RFID electronic tag product includes a dielectric substrate, an RFID chip 3, and an antenna structure 2, wherein the antenna structure includes a power supply loop 21, a pair of dipole antennas extending in opposite directions from both sides of the power supply loop, and a pair of radiating pieces 23 provided at the tips of the dipole antennas, and the width of the radiating pieces is greater than the width of the dipole antennas and the width of the power supply loop, and the edgeless RFID electronic tag product is manufactured by a die-cutting process, and in a product formed by cutting the outer circumference of the radiating pieces without contact with the power supply loop and the dipole antennas, the distance between the outer edge of the radiating piece and the edge of the dielectric substrate is zero.

Description

Technical Field

[0001] The present invention relates to the technical field of RFID tags, and particularly to edge - less RFID electronic tags.

Background Art

[0002] RFID electronic tags based on flexible substrates such as PET can be applied to the management of clothing and retail products, and are applied to various non - metallic environments including liquids. To avoid cutting or damaging the antenna structure, the antenna size of the conventional inlay needs to be at least 1 mm smaller than the product size.

Summary of the Invention

Problems to be Solved by the Invention

[0003] An object of the present invention is to provide an edge - less RFID electronic tag that can solve the drawback that the conventional inlay needs to leave an edge. The technical solution is as follows.

Means for Solving the Problems

[0004] In an edge - less RFID electronic tag including a dielectric substrate, an RFID chip, and an antenna structure, the antenna structure includes a power - feeding loop, a pair of dipole antennas extending in opposite directions on both sides of the power - feeding loop, and a pair of radiating pieces provided at the tips of the dipole antennas. The width of the radiating piece is larger than the width of the dipole antenna and the width of the power - feeding loop. The product of the edge - less RFID electronic tag is manufactured by a die - cutting process. In the product formed by cutting the outer periphery of the radiating piece without contacting the power - feeding loop and the dipole antenna, it is an edge - less RFID electronic tag in which the distance between the outer edge of the radiating piece and the edge of the dielectric substrate is zero.

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

[0006] Furthermore, the constraints between 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 radial piece is rectangular, and the shape of the cutout structure of the radial piece is substantially rectangular.

[0009] Furthermore, the aforementioned dipole antenna is a dipole antenna with a serpentine structure.

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

[0011] Furthermore, the shape of the power supply loop is approximately rectangular. [Effects of the Invention]

[0012] Compared to conventional technologies, this invention solves the drawback of requiring edges to be left on the inlay, and its most notable feature is that it maximizes antenna performance in a smaller product size. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram of a conventional inlay RFID electronic tag. [Figure 2] This is a schematic diagram of the antenna structure of the edgeless RFID electronic tag of the present invention before cutting. [Figure 3] This is a schematic diagram of the stacked structure of the edgeless RFID electronic tag of the present invention. [Figure 4] This is a schematic diagram of the cutting of the edgeless RFID electronic tag product of the present invention. [Modes for carrying out the invention]

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

[0015] The present invention 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 examples of edgeless RFID electronic tags that can be applied to the management of clothing and retail goods, and to various non-metallic environments, including liquids.

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

[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. The RFID chip 3 and the antenna structure 2 are electrically connected by a conductive adhesive. 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 where the antenna structure 2 is provided is directly bonded to the surface via the adhesive 4, and the dielectric substrate 1 and the surface protect the RFID chip 3 and the antenna structure 2.

[0019] As shown in FIG. 3, the antenna structure 2 includes a feeding loop 21, a pair of dipole antennas 22 extending in opposite directions on both sides of the feeding loop 21, and a pair of radiation patches 23 located at the tips of the dipole antennas 22. The connection points between the dipole antennas 22 and the feeding loop 21 are at the midpoints on both sides of the feeding loop 21. At this time, the antenna is in a state where the bandwidth, impedance matching, and gain are relatively balanced. By adjusting the size of the feeding loop 21, the impedance matching effect between the antenna structure 2 and the RFID chip 3 can be adjusted so as to improve the antenna performance of the electronic tag.

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

[0021] In this embodiment, the lengths of the folded portions of each dipole antenna 22 are not equal, and the radiation efficiency of the antenna can be optimized to a certain extent.

[0022] In this embodiment, the radiation patch 23 has a rectangular structure, and the shape of the internal cut-out structure 231 is substantially rectangular. Note that the shape of the cut-out structure 231 can be designed as needed, including but not limited to a rectangle. The cut-out radiation patch 23 can effectively reduce the reflection of the current at the antenna tip, thereby improving the input impedance characteristics of the antenna, widening the operating frequency band of the antenna, and making the antenna more adaptable to various usage environments including liquids, etc.

[0023] As shown in FIG. 3, since the width of the radiation patch 23 in the antenna structure 2 is larger than the width of the dipole antenna 22 and the width of the feeding loop 21, it is permitted to cut around the radiation patch 23 so as to form the antenna structure 2' when it is fabricated on the product, and by making the size of the antenna structure 2' equal to the product size (the distance between the outer edge of the radiation patch 23' of the antenna structure 2' and the edge of the dielectric substrate 1 becomes zero), the antenna performance can be maximally exerted. According to this method, the drawback that it is necessary to leave an edge in the conventional inlay can be solved. That is, the size of the antenna structure of the conventional inlay needs to be at least 1 mm smaller than the size of the dielectric substrate so as not to cut the antenna or damage the antenna structure.

[0024] In a specific application, the distance between the cutting line 6 and the punching structure 231 is larger than 0.8 mm, and the distance between the cutting line 6 and the dipole antenna 22 and the feeding loop 21 is larger than 0.5 mm, so as not to damage the antenna structure. The distance that the edge of the radiation patch 23 exceeds the cutting line 6 is preferably not less than 0.5 mm and not more than 2 mm from the viewpoint of material saving.

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

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

[0027] While the present invention is specifically illustrated and presented in combination with preferred embodiments, those skilled in the art will understand that various formal and detailed modifications can be made to the invention without departing from the spirit and scope of the invention as limited by the appended claims, and all such modifications remain within the scope of the protection of the present invention. [Contents of the specification are to be entered here.]

Claims

1. In 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 elements provided at the tips of the dipole antennas. The width of the radiating element is greater than the width of the dipole antenna and the width of the feed loop, and the edgeless RFID electronic tag product is manufactured by a die-cutting process, and is formed by cutting the outer circumference of the radiating element without contact with the feed loop and the dipole antenna, such that the distance between the outer edge of the radiating element and the edge of the dielectric substrate is zero. An edgeless RFID electronic tag characterized by the following features.

2. The aforementioned radial piece is a plate-shaped member having a cutout structure. The edgeless RFID electronic tag according to claim 1.

3. The overall shape of the radiating element is rectangular, and the shape of the cutout structure of the radiating element is approximately rectangular. The edgeless RFID electronic tag according to feature 2.

4. The constraints between 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 die-cut structure 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. The edgeless RFID electronic tag according to feature 2.

5. The cutting frame formed by the aforementioned cutting line is a rectangular frame. The edgeless RFID electronic tag according to feature 2.

6. The aforementioned dipole antenna is a dipole antenna with a serpentine structure. The edgeless RFID electronic tag according to claim 1.

7. The lengths of each folded portion of the aforementioned dipole antenna are not equal. The edgeless RFID electronic tag according to feature 6.

8. The shape of the power supply loop is approximately rectangular. The edgeless RFID electronic tag according to claim 1.

Images