RFID label having an antenna with improved properties

Description

1 / 10 RFID TAG WITH AN ENHANCED ANTENNA TECHNICAL FIELD OF THE PRESENT INVENTION

[001] The present invention relates to a device with means for detecting and emitting electromagnetic radiation and a corresponding antenna suitable for mounting on a tire. More specifically, the electromagnetic radiation is in the radio frequency range and the device is an RFID tag with a wire configured to conduct electrical signals and a tire comprising the same. BACKGROUND OF THE PRESENT INVENTION

[002] It is known that incorporating electrical devices into tire structures has many advantages, such as tracking the tire during manufacturing, transportation, and storage operations, as well as measuring and recording physical parameters such as temperature and pressure. Different types of electrical devices are used in the technique for these purposes, with radio frequency communication between the tire and an external monitoring or interrogation device being the most common. Such communication systems often include a radio frequency identification (RFID) tag and a reader that communicates with the RFID tag. The RFID tag includes an antenna and an RFID chip. Thus, information from the reader is received through the antenna and stored on an RFID chip, and the information stored on the RFID chip is transmitted to the reader through the antenna. RFID devices can be read-only, write-only, or read-and-write devices.

[003] The use of RFID tags and corresponding antennas is common across a variety of applications, including tires. Recently, attaching RFID tags inside or on a tire has become a common application. Some of the problems commonly encountered in such applications can be summarized as poor backscatter performance, difficulty in production, and short reading distance. Another Petition 870250085879, dated 09 / 23 / 2025, page 18 / 32 2 / 10 of the problem is the size of the antenna that the label has. If the antenna size exceeds a predetermined length, it becomes more difficult to attach the antenna to the tire.

[004] A prior art publication in the technical field of the present invention may be referred to as WO2017060222A1, among others, the document disclosing an antenna for use in an RFID tag. The antenna wire comprises metallic fibers. The metallic fibers are stainless steel fibers. The antenna wire is wound by at least one winding wire, thus covering the entire surface of the antenna wire or the metal wire or the bundle of metal wires. The at least one winding wire comprises non-electrically conductive fibers.

[005] A state-of-the-art publication in the technical field of the present invention may be referred to as EP4063544A1 among others, the document disclosing a composite wire supporting an electronic component and a method for producing the same.

[006] It is an object of the present invention to manufacture an RFID tag having an antenna wherein the manufacturing process of the RFID tag and that of the antenna is facilitated.

[007] Another objective of the present invention is to improve the signal strength of the antenna, thereby increasing its reading distance.

[008] Another objective of the present invention is to optimize the antenna length according to the requirements of different types of tires.

[009] Another objective of the present invention is to maximize backscattering, thereby improving antenna signal quality.

[0010] Another objective of the present invention is to provide a unit comprising an RFID tag and an antenna with greater resistance.

[0011] The method employed to achieve the objective of the present invention is disclosed in the first claim and in the Petition 870250085879, dated 09 / 23 / 2025, page 19 / 32 3 / 10 dependent claims comprise an electronic device wherein the electronic device is capable of communicating via radio frequency signal. In the preferred embodiment of the invention, said electronic device is an RFID tag. Said device comprises an antenna for strengthening signals and facilitating communication, wherein said antenna comprises a core composed mainly of a plurality of wires twisted around each other. The core is then covered by means of a pair of protective wires twisted around the core, completely enclosing the core. The core comprises a first wire wherein the first wire is made of aramid and a second wire wherein the second wire is made of a metallic substance. In the preferred embodiment, the metallic substance is steel, but those skilled in the art may apply any other metallic material that can be used for such application.By combining aramid and metal wires, but more preferably steel wires, greater signal strength is achieved. Furthermore, the reading distance is greater compared to conventional systems.

[0012] In the preferred embodiment of the invention, the dtex value of the first wire is between 400 and 700. In the most preferred embodiment of the invention, the said dtex value of said first wire is 670. On the other hand, the second wire comprises between 250 and 300 filaments, but more preferably 270 and 280 filaments, but even more preferably 275 filaments. The said range of filaments, but more specifically 275 filaments, provides an improved signal strength.

[0013] In the preferred embodiment of the invention, the second yarn has 50 to 200 TPM, but more specifically 100 TPM. TPM is the twist per meter value commonly used for yarns.

[0014] In the preferred embodiment of the invention, the first yarn and the second yarn are twisted around each other for 200 to 300 TPM, but more preferably 235 TPM. The said range and value Petition 870250085879, dated 09 / 23 / 2025, page 20 / 32 4 / 10 of TPM provides ideal signal strength, preventing breakage of metallic filaments.

[0015] In the preferred embodiment of the invention, the protective wires are twisted around themselves by 75 to 250, but more preferably 90 to 200, but even more preferably 100 TPM. Furthermore, the dtex value of said protective wires is between 450 and 500. Said dtex value ensures that the protective wires are thick enough to protect the core from the outside. Additionally, protective wires are twisted around the core between 1000 and 1400 TPM. One of said protective wires is Z-twisted and the other S-twisted. In another embodiment, said protective wires may have the same twist direction.

[0016] In the preferred embodiment of the invention, the antenna is coated primarily with an RFL solution and secondarily with an adhesive solution.

[0017] In the preferred embodiment of the invention, the electronic device is suitable for use in a tire.

[0018] Through the present invention, ease of production, high backscatter performance and greater reading distance are achieved. In addition, signal strength is improved and a stronger RFID antenna and tag configuration is realized.

[0019] The drawings are not intended to delimit the scope of protection as identified in the claims, nor should they be referred to alone in an effort to interpret the scope identified in the claims without recourse to the technical disclosure in the description of the present invention.

[0020] Figure 1 - is a perspective view of the electronic device.

[0021] Figure 2 - is a perspective view of the core and the protective wire.

[0022] Figure 3 - is a perspective view of the antenna. Petition 870250085879, dated 09 / 23 / 2025, page 21 / 32 5 / 10

[0023] Figure 4 - is a cross-sectional area of ​​the antenna along the dashed lines AA in Figure 3.

[0024] The following numbers are assigned to different parts shown in the drawings and referred to in this detailed description of the invention: 1. Electronic Device 2. Antenna 3. Core 4. Textile yarn 4.1 First Wire 4.2 Second Wire 5. Protective Wire Detailed Description of the Present Invention

[0025] The present invention relates to an electronic device (1) configured to communicate radio frequency signals comprising; a chip, a first antenna and a second antenna (2), wherein the second antenna (2) is configured to form electromagnetic coupling with the first antenna and wherein the second antenna (2) is configured to facilitate the communication of radio frequency signals comprising; a core (3) comprising a plurality of wires (4.1, 4.2), a pair of protective wires (5) twisted around the core (3).

[0026] The present invention further comprises the core (3) comprising a first wire (4.1) made of aramid and a second wire (4.2) made of steel wherein said wires (4.1, 4.2) are twisted around each other. Said electronic device (1) may be an identification or tracking device and may be used to record manufacturing, distribution, sales, temperature measurement, pressure measurement or other physical properties of a tire during tire operation. In addition, said electronic device (1) may be used to measure parameters during tire storage. In the preferred embodiment of the invention, said device Petition 870250085879, dated 09 / 23 / 2025, page 22 / 32 6 / 10 electrical (1) is an RFID transponder wherein said RFID transponder comprises a chip and antenna (2), the antenna (2) being configured to facilitate communication with an RFID reader, the reader being provided as an external part. The antenna (2) comprises the core (3), the core (3) being in elongated form to facilitate the transmission of radio waves and therefore data packets, comprises a pair of wires (4.1, 4.2). The first wire (4.1) is made of aramid, while the second wire (4.2) is made of a metal, but more preferably is made of steel. It needs to be understood that those skilled in the art may use any metal that is known to increase signal strength in such applications. For example, the second wires (4.2) may be made of copper, aluminum, titanium or silver. The first and second yarns (4.1, 4.2) are Z and S twists. In another embodiment, the first and second yarns are S and Z twists. By twisting the aforementioned yarns (4.1, 4.2), a spring effect is achieved, thus decreasing the chance of core breakage (3). Furthermore, said wires (4.1, 4.2) are twisted around each other. They can be twisted around each other by a Z or S twist which aids in the interlocking of said (4.1, 4.2). By means of the first wire (4.1) being aramid and the second wire (4.1) being made of a metallic wire, but more preferably steel wire, the signal transmission strength is improved, however, achieving greater backscattering performance. Said combination also provides greater reading distance. Said wires (4.1, 4.2) are subsequently covered by means of the protective wires (5), wherein the number of protective wires (5) in the preferred embodiment is two. The protective wires (5), as the name suggests, provide a protective layer around the core (3), i.e., first and second wires (4.1, 4.2), isolating said wires (4.1, 4.2) the environmental conditions and chemicals in which the antenna (2) will be subsequently immersed. Petition 870250085879, dated 09 / 23 / 2025, p. 23 / 32 7 / 10

[0027] In the preferred embodiment of the invention, the dtex value of the first wire (4.1) is between 400 and 700. This range has been found to be the most ideal because dtex values ​​greater than 700 make the radius of the core (3) and therefore that of the antenna (2) thicker and outside acceptable limits.

[0028] In the preferred embodiment of the invention, the second wire (4.2) comprises between 250 and 300 filaments, but more preferably 270 to 280 filaments, but more preferably 275 filaments. The second wire (4.2) comprises a plurality of filaments made of metal. In one embodiment, the number of filaments is between 250 and 300 to provide good signal strength. In another embodiment, the number of filaments is between 270 and 280. These ranges are important because they provide good signal strength while keeping the core thickness (3) to a minimum, which prevents the core (3) from being recognized as a large foreign body inside the tire, thus achieving good adhesion of the antenna (2) and the electronic device (1) on or inside the tire.It has been experimentally verified that 275 filaments are the most ideal choice, as they provide superior signal strength, greater reading distance and high backscatter performance, while keeping the antenna thickness (2) to a minimum, thus providing good adhesion of the electronic device (1) to the tire.

[0029] In the preferred embodiment of the invention, the second wire (4.2) has 50 to 200 TPM, but more preferably 100 TPM. TPM means turns per meter of a wire. 50 to 200 TPM, but more preferably 100 TPM, provide higher RSSI values. The aforementioned TPM range provides a lower RSSI value, thus achieving better signal strength. In other words, signal strength is improved by -50dB ±1dB, where dB means Decibel.

[0030] In the preferred embodiment of the invention, the wires (4.1, 4.2) are twisted around each other for 200 to 300 TPM, but Petition 870250085879, dated 09 / 23 / 2025, page 24 / 32 8 / 10 more preferably 235 TPM. To provide excellent fatigue resistance and conductivity performance, the TPM value of said wires (4.1, 4.2) relative to each other is very important. Therefore, in a preferred embodiment, said TPM value is between 200 and 300 TPM, but more preferably 235 TPM. 235 TPM was considered the most ideal value to provide good fatigue and conductivity performance. Another aspect to be considered is the fact that high TPM values, such as 400 and above, increase the possibility of breakage of metallic filaments, in this case steel.

[0031] In the preferred embodiment of the invention, the protective wires (5) are 75 to 250 TPM, but more preferably 90 to 200 TPM, but even more preferably 100 TPM. The number of TPM of protective wires (5) around the core (3) should be less than 200, as higher numbers cause the problem of gap formation between the protective wires (5). As a result, the solution leaks into the core (3) of the antenna (2), which, in turn, will damage the core (3) or reduce the signal strength. In the preferred embodiment of the present invention, one of the protective wires (5) is Z-twist, while the other is S-twist. By using S and Z twists, the core (3) is securely and completely closed.

[0032] The number of TPMs of the pair's protective wires (5) in relation to themselves is 100 TPM.

[0033] In the preferred embodiment of the invention, the dtex value of the protective wires (5) is between 450 and 500. The dtex value of the protective wires (5) is important because high dtex values, i.e., above 500, make the antenna (2) thicker than acceptable, which in turn creates the foreign matter behavior effect. As a result of this behavior, the electronic device (1) may detach from the tire. Furthermore, higher dtex values ​​increase the thickness of the electronic device (1), which in turn increases the weight. Petition 870250085879, dated 09 / 23 / 2025, page 25 / 32 9 / 10 of the electronic device (1). This increases the problem of foreign body behavior inside the tire. It has been experimentally observed that the most ideal dtex value for protective wires (5) is 450.

[0034] In a preferred embodiment, protective wires (5) are made of nylon.

[0035] In the preferred embodiment of the invention, the protective wires (5) are twisted around the core (3) between 1000 and 2000 TPM. The TPM values ​​mentioned are chosen so as to cover the second wire (4.2) from the external environment, which will increase the service time of the electronic device (1). In a preferred embodiment, the protective wires (5) are twisted around the core (3) between 1000 and 1400 TPM. It has been experimentally observed that the most ideal TPM value is between 1300 ±%6.

[0036] In the preferred embodiment of the invention, the antenna (2) is primarily coated with an RFL solution. In alternative embodiments, resorcinol formaldehyde-free (RF-free) compositions may be used, such as compositions containing acrylic resins or natural latex. In alternative embodiments, a rosin ester and / or rosin ester tackifying agent may be added to the immersion solution. The solutions may be water-based or organic solution-based. Organic solvents are chosen from a group containing toluene, hydrocarbon solvents, xylene, ethyl acetate, alcohols, ethers, and mixtures thereof. The antenna (2) is then coated with the tackifying solution and then dried. However, those skilled in the art may appreciate that any method known in the art for improving the adhesion of components to rubber may be used in this application.The ultimate goal is to ensure that the antenna (2) remains intact and attached to or inside the tire for the entire lifespan of the tire.

[0037] In the preferred embodiment of the invention, the device Petition 870250085879, dated 09 / 23 / 2025, page 26 / 32 The 10 / 10 electronic device (1) is used in a tire. The type of tire with which the electronic device (1) can be fitted includes, but is not limited to, bias-ply tires, belted bias-ply tires, radial tires, solid tires, semi-pneumatic tires, pneumatic tires, and airless tires. The electronic device (1) can be fixed directly to the rubber before the curing process, incorporating it between the layers that comprise the final tire product. Furthermore, the electronic device can be mounted in any suitable location within the tire.

[0038] One advantageous effect provided by the invention is that the simplified construction of the electronic device provides ease of production which, in turn, will help to lower manufacturing-related costs.

[0039] Another advantageous effect provided by the invention is greater backscattering performance. Another advantageous effect provided by the invention is that the reading distance is greater than that of the antenna produced according to previous methods.

[0040] Another advantageous effect provided by means of the invention is to provide an electronic device (1) with an antenna (2) with improved resistance and strength.

[0041] Another advantageous effect provided by the invention is that the signal strength of the electronic device (1) is improved. Petition 870250085879, dated 09 / 23 / 2025, page 27 / 32

Claims

1 / 2 CLAIMS 1. Electronic device (1), configured to communicate radio frequency signals, comprising: a chip, a first antenna and a second antenna (2), wherein the second antenna (2) is configured to form electromagnetic coupling with the first antenna and wherein the second antenna (2) is configured to facilitate the communication of radio frequency signals comprising: a core (3) comprising a plurality of wires (4.1, 4.2), a pair of protective wires (5) twisted around the core (3), characterized in that the core (3) comprises a first wire (4.1) made of aramid and a second wire (4.2) made of metal wherein said wires (4.1, 4.2) are twisted around each other.

2. Electronic device (1), according to claim 1, characterized in that the dtex value of the first wire (4.1) is between 400 and 700.

3. Electronic device (1), according to any of the preceding claims, characterized in that the second wire (4.2) comprises between 250 and 300 filaments, but more preferably 270 and 280 filaments, but more preferably 275 filaments.

4. Electronic device (1), according to any of the preceding claims, characterized in that the second wire (4.2) has 50 to 200 TPM, but more preferably 100 TPM.

5. Electronic device (1), according to any of the preceding claims, characterized in that the wires (4.1, 4.2) are twisted around each other by 200 to 300 TPM, but more preferably 235 TPM.

6. Electronic device (1), according to any one of the previous claims, characterized in that the protective wires (5) are 75 to 250 TPM, but more preferably 90 to 200 TPM, but more preferably 100 TPM.

7. Electronic device (1), according to any of the preceding claims, characterized in that the dtex value of the protective wires (5) is between 450 and 500.

8. Electronic device (1), according to any of the preceding claims, characterized in that the protective wires (5) are twisted around the core (3) between 1000 and 1400 TPM.

9. Electronic device (1), according to any of the preceding claims, characterized in that the antenna (2) is coated primarily with an RFL solution.

10. Electronic device (1), according to claim 9, characterized in that the antenna (2) is secondarily coated with an adhesive solution.

11. Electronic device (1), according to claim 10, characterized in that the tackifying solution contains at least one material selected from the group consisting of resorcinol formaldehyde latex solution, acrylic resin solution, rosin ester solution, natural latex solution and combinations thereof.

12. Tire, characterized in that it has an electronic device (1) as defined in any one of claims 1 to 11. Petition 870250085879, dated 23 / 09 / 2025, p. 29 / 32

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