KR100851420B1 - 2D flat structure RFID tag for tires - Google Patents

Abstract

The present invention relates to an RFID tag for a tire and a manufacturing method thereof, and more particularly, to an RFID tag by printing on a thin polyimide film using a composition for an ink containing a silver (Ag) complex compound. By forming an antenna and bonding a chip printed circuit thereon to drive the RFID tag for the tire, the electrical conductivity is very good and the uniformity of product quality due to the printing manufacturing process is ensured. When the tag is attached, the adhesive force is stably maintained, which satisfies the temperature conditions of 200 ℃ ~ 250 ℃ and the rigidity specification of 30Bar or more, especially when the tire is coupled to the vehicle body, so that the tire is deformed or damaged by high speed and strong pressure. Even in harsh environments, the error rate can be reduced when driving RFID tags. The present invention provides an RFID tag and a method of manufacturing the same to prevent defects that may occur between embedded foreign materials.

RFID, tag, silver complex compound, polyimide, film, tire, adhesive force, error rate

Description

Two Dimension Plane Structure Method RFID Tag for tire}

1 shows a tire tag according to an embodiment of the present invention.

2 shows a tire tag according to another embodiment of the present invention.

3 illustrates a tire tag according to an exemplary embodiment of FIG. 2.

Figure 4 shows a cross-sectional view of the tire tag provided on the tire.

<Explanation of symbols for the main parts of the drawings>

10, 20, 40, 50: antenna 30, 60: circuit part

41, 42: closed loop 43, 44: opening

The present invention relates to an RFID tag (tire tag) for a tire and a method of manufacturing the same, and more particularly, to a thin polyimide film using a composition for ink containing a silver (Ag) complex compound. By forming an RFID tag antenna by printing and bonding a chip printed circuit thereon to drive the RFID tag for tires, the electrical conductivity is very good and the uniformity of product quality due to the printing manufacturing process is ensured. When the tag is attached to the tire, the adhesive force is stably maintained, which satisfies the temperature condition of 200 ℃ ~ 250 ℃ and the rigidity specification of 30Bar or more that occur during tire manufacturing process. Even in harsh environments that can be deformed or damaged, the error rate can be reduced when driving RFID tags. Provides a mounting or to allow the defects which may occur between the embedded foreign matter can be prevented in advance the RF for a tire of a two-dimensional surface structure of ID Tag system and a method of manufacturing the same.

In general, RFID (radio frequency identification) is a non-contact recognition system that attaches a small chip to a variety of items to transmit and process the information of the thing at a radio frequency, the tag consisting of a chip and an antenna and the information of the article stored in the chip It consists of a reader.

The RFID tag is usually attached to the surface of the product or inserted into the article, and the detection success rate is varied according to the angle formed by the RFID reader for detecting the RFID tag. In general, the detection success rate of the RFID tag is highest when the reader faces the surface direction of the RFID tag, and the detection success rate is the lowest when the reader is facing the line direction of the RFID tag. Accordingly, there have been attempts to make the RFID tag into a three-dimensional shape in order to increase the detection success rate of the RFID tag, but in this case, it is not applicable to articles that are difficult to mount the three-dimensional RFID tag, and the price of the RFID tag itself increases. There was this.

In addition, in the case of attaching or embedding a tag from the molding stage of tire manufacturing to apply an ERP system such as LOT production management or inventory management of tire manufacturing, the harsh manufacturing environment of the subsequent vulcanization process, that is, 200 ° C In the manufacturing environment, such as the temperature condition of ~ 250 ℃ or more than 30Bar, there was a problem that can not perform the performance due to the damage to the tag quality.

In addition, when the RFID tag of the three-dimensional shape is bulk (bulk) can be applied without a great effort when the article is not movement, but if you need to apply to aircraft tires and vehicle tires, it takes up a certain space in the tire bar, tires The product may be damaged due to the damage of the product during the rotation or at the temperature of 200 ℃ ~ 250 ℃ and the durability of 30Bar or more.The part where the RFID tag is inserted (or attached) Problems may arise due to differences in other parts and physical properties (eg, the elasticity or thermal expansion coefficient of a tire).

If the planar RFID tag is applied to the tire surface, the tire may be worn by the tire that rotates at a high speed and lose the function unique to the RFID tag. To solve this problem, when a flat RFID tag is inserted into the tire, a metal wire (antenna) for performing wireless communication with a reader outside the tire is damaged by pressure applied to the tire when the tire rotates. There was a problem that could be worn.

In addition, when the tire tag does not have heat resistance in response to the heating phenomenon that is inevitably generated in the tire rotating at high speed, there was also a problem that a thermal shock may occur.

In addition, if the antenna printed on the tire RFID tag is not printed uniformly, precisely and stably, the above-described tag applied to the tire exposed to the harsh environment such as driving and temperature change may cause malfunction or error. Therefore, the material input in the process of manufacturing the RFID tag, etc. should be carefully selected, in this case, it is necessary to carefully consider the compatibility between the printed material and the printed material.

In order to solve the above problems, the present invention provides a RFID tag by printing a conductive material on a flexible material having excellent binding properties with a tire to form an RFID tag, and thus, when the tire is rotated, the two-dimensional plane does not change the physical properties of the tire even when the damage rate is low. A tire tag having a structure and a method of manufacturing the same.

The present invention has been made to solve the above problems, the present invention is to apply a composition for ink containing a silver (Ag) complex compound to a polyimide film to produce an RFID tag for a tire and mounting it on the tire tag Is attached to the tire or inserted into the tire, the tire tag is not overwhelmed by pressure changes, thermal changes, etc. on the tire, and by forming the tire tag in a thin film form, the internal void due to the stress continuously applied to the tire. Or it aims at being able to suppress the generation of a flaw.

In addition, the present invention efficiently manages the manufacturing process of the tire manufacturing process, that is, attaching or embedding a tag from the initial stage, from manufacturing lot production management or inventory to distribution management, and in the reliability of harsh high temperature, high humidity, robustness such as vulcanization process, etc. The aim is to maintain tag performance without compromising tag quality.

In addition, another object of the present invention is to be able to prevent the cause of the sudden breakage or shortening of the tire in advance. In addition, another object of the present invention is to provide an RFID tag for a tire that has a high conductivity despite being heat treated at a low temperature.

In addition, another object of the present invention is to provide an RFID tag for a tire that is uniformly formed in a printing film and that the adhesion of the formed printing film is excellent so that it can function well even when applied to a tire.

The present invention is formed by printing a composition for ink containing a silver complex compound obtained by reacting a silver compound with an ammonium carbamate-based or ammonium carbonate-based compound on a polyimide film, in order to achieve the above object, an RFID reader An antenna resonating to a radio wave transmitted from an antenna, and a circuit portion fed and driven by the radio wave, wherein the circuit portion includes at least one closed loop for generating an inductive reactance in the polyimide plane. It provides an RFID tag for a tire of a two-dimensional planar structure, characterized in that the capacitive reactance of the circuit portion to cancel through the inductive reactance formed through the loop.

또는,

또는,

중에서 선택되는 하나 이상의 물질인 것이 바람직하다(여기서, R1, R2, R3, R4, R5 및 R6는 서로 같거나 다를 수 있으며, 이들은 각각 수소, 탄소 수 1 내지 30개의 지방족이나 지환족 알킬기 또는 아릴이나 이들의 혼합인 아랄킬(aralkyl)기, 관능기가 치환된 알킬 및 아릴기 그리고 헤테로고리 화합물과 고분자화합물 및 그 유도체로부터 되는 기에서 선택되는 어느 하나이다). Here, the silver compound is silver and oxygen, sulfur, halogen, cyano, cyanate, carbonate, nitrate, nitrite, sulfate, phosphate, thiocyanate, chlorate, perchlorate, tetrafluoroborate, acetylacetonate, A substituent selected from carboxylate or their derivatives is formed by bonding, and the ammonium carbamate or ammonium carbonate compound is

or,

or,

It is preferred that at least one of the materials selected from (wherein R1, R2, R3, R4, R5 and R6 may be the same or different from each other, each of which is hydrogen, an aliphatic or alicyclic alkyl group having 1 to 30 carbon atoms or aryl Aralkyl groups, mixtures thereof, alkyl and aryl groups substituted with functional groups, and heterocyclic compounds, polymer compounds and derivatives thereof.

In addition, the ink composition containing the silver complex compound is silkscreen, spin coating, roll coating, spray coating, dip coating, flow coating, doctor blade on the polyimide film printed and heat-treated by at least one method selected from doctor blade and dispensing, inkjet printing, offset printing, screen printing, pad printing, gravure printing and flexography printing. It is preferable.

Moreover, it is preferable that the heat processing after printing of the ink composition containing the said silver complex compound is made in the range of 80-400 degreeC.

Further, at least one closed loop is provided between the antenna and the circuit section, and the length of the antenna is preferably inversely proportional to the diameter of the closed loop.

The closed loop may include a first closed loop and a second closed loop, wherein the first closed loop macroscopically cancels the capacitive reactance of the circuit part, and the second closed loop is a capacitive part of the circuit part. It is desirable to cancel the reactance microscopically.

In addition, the diameter of the first closed loop is preferably larger than the diameter of the second closed loop.

In addition, the RFID tag is preferably embedded in the tire.

In addition, the present invention, in order to achieve the above object, the opening is formed, it is preferable that the material of the tire penetrates into the open area is fixedly coupled to the tire.

In addition, it is preferable to be provided at any one of the tire opposite the shoulder, the inner liner, the side wall, the inside of the shoulder, the apex, and the side wall and the inner liner.

In addition, one side of the RFID tag, a coupling groove penetrating the RFID tag is provided, the coupling groove is preferably to be fixed to the tire so that the material constituting the tire can penetrate.

In addition, the coupling groove is preferably in the shape of any one of a circle, an ellipse, and a polygon.

In addition, the diameter of the closed loop is determined to match the impedance of the antenna and the circuit portion, and the sum of the impedance formed by the diameter and the impedance of the antenna is preferably equal to the input impedance of the circuit portion.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The tire tag according to the present invention is produced by printing a composition for an ink containing a silver complex compound on a polyimide film, wherein the composition for an ink including the silver complex compound is one or more silver compounds represented by the following Formula 1 and Formula 2 It is obtained by reacting at least one ammonium carbamate or ammonium carbonate compound represented by the formula (3) or (4). Here, the silver complex compound includes an amine compound, a stabilizer which is a compound of Formula 2, Formula 3 or Formula 4 or at least one of these mixtures.

(Formula 1)

(Formula 2)

(Formula 3)

(Formula 4)

In Formula 1, n is an integer of 1 to 4, X is oxygen, sulfur, halogen, cyano, cyanate, carbonate, nitrate, nitrite, sulfate, phosphate, thiocyanate, chlorate, perchlorate, Specific examples of tetrafluoroborate, acetylacetonate, carboxylate and the like include silver oxide, thiocyanated silver, silver sulfide, silver chloride, silver cyanide, silver cyanated silver, silver carbonate, silver nitrate, silver nitrite Silver sulfate, silver phosphate, silver perchlorate, silver tetrafluoroborate, silver acetylacetonated silver, silver acetate, silver lactate, silver oxalate and derivatives thereof, and the like, but are not particularly limited thereto. The use of silver or silver carbonate is more preferred in terms of reactivity and post-treatment.

And in Chemical Formula 2, Chemical Formula 3 or Chemical Formula 4, R1, R2, R3, R4, R5, and R6 may be the same or different from each other, and each of hydrogen, an aliphatic or alicyclic alkyl group having 1 to 30 carbon atoms, or aryl, Aralkyl groups, mixtures thereof, alkyl and aryl groups substituted with functional groups, and heterocyclic compounds, polymer compounds and derivatives thereof, and the like, and the like, are not particularly limited thereto.

As a method for printing the ink composition containing the silver complex compound as described above on an RFID tag, silk screen, spin coating, roll coating, spray coating, dip coating, flow coating Doctor blade and dispensing, inkjet printing, offset printing, screen printing, pad printing, gravure printing and flexography printing can be used.

The viscosity of the ink composition containing the silver complex compound of the present invention is usually preferably in the range of 0.1 to 200,000 cps, and more preferably 1 to 10,000 cps. In the above printing method, for example, the viscosity of the ink is important when forming a thin film and a pattern by inkjet printing, but the viscosity range is 0.1 to 50 cps, preferably 1 to 20 cps, and more preferably 2 to 15 cps. If the thickness is lower than this range, the thickness of the thin film after firing may not be sufficient, and electrical conductivity may be lowered. If the thickness is higher than the range, ink may not be smoothly discharged.

The thin film or pattern thus obtained can be used to form a metal or metal oxide pattern through an aftertreatment process such as oxidation or reduction treatment, heat treatment, infrared rays, ultraviolet rays, electron beams, and laser treatments. . The post-treatment step may be heat treated under a normal inert atmosphere, but may be processed in air, nitrogen, carbon monoxide, or even a mixed gas of hydrogen and air or another inert gas, if necessary.

Heat treatment is usually between 80 to 400 ℃, preferably 80 to 300 ℃, more preferably 120 to 250 ℃ heat treatment is good for the properties of the thin film. In addition, heat treatment of two or more steps at low and high temperatures within the above range is also good for the uniformity of the thin film. For example, it is good to process for 3 to 30 minutes at 80-150 degreeC, and to process for 5 to 30 minutes at 150-300 degreeC.

The RFID tag for a tire manufactured as described above can be printed dense and uniformly on the polyimide film with excellent adhesion between the ink composition containing the silver complex compound and the polyimide film, and thus the tire complex tag can be printed on the tire. When applied, the tag can be operated stably even if the operating environment changes suddenly.

Meanwhile, since polyimide (PI) was invented by DuPont's Sroog in the late 1950s, polyimide (PI) has been widely studied and put into practical use in aerospace and electronic materials because of its excellent heat resistance and mechanical properties. It is a heat resistant plastic. In the aerospace field, starting with NASA, research on thermosetting PI having a crosslinking group as a prepreg material of structures has been conducted mainly in material makers. The use of PI in the electrical industry began to spread rapidly since the liquid resin [Pyre ML] was sold by DuPont in the late 1960s as a coating material for enameled wire, and also as a film material and a molding material. [Kapton H] films and [Vespel] resins were commercialized.

In the present invention, the polyimide known as heat-resistant plastic as described above can be injected together when injecting the casting for the manufacture of the tire into the mold, the polyimide film does not melt even when the temperature of the casting is 150 ℃ or more, tire material When the solidification is formed integrally with the tire to operate, there is no problem in the operation performance of the tag for the history management of the tire, and can have mechanical reliability.

In addition, since the tire tag may be integrally operated with the tire, the tire tag may be interlocked with the stress or thermal change that may occur in the tire to mitigate physical and mechanical defects that may occur at the position where the tire tag is inserted. And the life expectancy of the tire tag can be increased.

In general, when the tire tag is applied to the tire, it may be attached to the outside, but in this case, although it is excellent in terms of convenience of manufacturing, there is a disadvantage in that it is not stable because a certain limit occurs in the adhesive force of the tag.

However, the RFID tag for a tire according to the present invention is preferably used in a form that is manufactured together with a casting and embedded in the tire. However, the RFID tag for a tire may be used to be attached to the outside of the tire. It is not desirable to limit.

Next, the structure and characteristics of the tire tag according to the present invention will be described.

1 shows a tire tag according to an embodiment of the present invention.

The illustrated tire tag includes a pair of antennas 10 and 20 and a circuit portion 30 connected to the antennas 10 and 20. The circuit unit 30 has information on the physical properties of the tire, such as the pneumatic pressure and temperature of the tire, and provides them through the antennas 10 and 20 when required by an external transponder. Therefore, the circuit unit 30 must include a power supply circuit for rectifying the radio wave applied through the antennas 10 and 20 to be used as a driving power source, and the power supply circuit includes a schottky series diode and a capacitor. At 30, capacitive reactance basically exists.

The antennas 10 and 20 are determined in proportion to the length of the wavelength of the radio wave provided by the transponder. Typically, the smaller the wavelength of the radio wave, the shorter the lengths of the antennas 10, 20, and vice versa. The figure shows an example in which the antennas 10 and 20 are formed in a mid-end shape in order to minimize the area occupied by the antennas 10 and 20. Such a mid-end antenna 10, 20 inevitably has more inductive reactance than a normal wire.

Accordingly, in order to completely transmit the electric wave supplied from the antennas 10 and 20 to the circuit unit 30, it is necessary to match the impedances of the antennas 10 and 20 with the impedance of the circuit unit. When the impedances of the antennas 10 and 20 and the circuit unit 30 are the same, the maximum amount of radio waves received by the antennas 10 and 20 are transmitted to the circuit unit 30. In the drawing, the inductive reactance is present in the antennas 10 and 20 having the coil shape, and the capacitive reactance is present in the circuit unit 30 including the power feeding circuit, so that the absolute values of the two are the same, but the phases are opposite. It is preferable. When the tire tag is mounted on a tire of an airplane and a vehicle, the antennas 10 and 20 formed on the two-dimensional polyimide film have a shape that increases or may have wheels, and thus the capacitive reactance may change. Accordingly, the present applicant will minimize the fluctuation of the capacitive reactance and describe an embodiment in which the magnitude of the capacitive reactance can be modified macroscopically or microscopically with reference to FIG. 2.

2 shows a tire tag similar to that shown in FIG. 1, in which closed loops 41 and 42 are inserted into portions of the antennas 40 and 50, thereby inducing inductive reactances of the antennas 40 and 50. It has a feature to adjust. Inductive reactance can be varied by varying the size and shape of the closed loops 41, 42 shown. The closed loops 41 and 42 vary inductive reactance according to their shape and size and allow for macroscopic or microscopic modifications. Preferably, the inductive reactance is modified macroscopically by varying the size of the closed loop 41, and the inductive reactance is microscopically modified by varying the size of the closed loop 42. Therefore, the tag formed on the two-dimensional plane of the polyimide film has an inductive reactance that can be resonated in the circuit portion including the tag chip impedance, and the present embodiment adjusts the sizes of the closed loops 41 and 42 to control the inductive reactance. By adjusting the size, this offsets the capacitive reactance of the circuit unit 60. In order to vary the inductive reactances of the antennas 10 and 20 shown in FIG. 1, the longitudinal direction of the antennas 10 and 20 of the mid-end shape needs to be increased or decreased, and in some cases, the overall size of the tire tag may increase. However, in the present embodiment, by interpolating one or more closed loops into the antennas 40 and 50, the antennas 40 and 50 and the circuit portion may be changed without changing the total size occupied by the antennas 40 and 50 and the circuit portion 60. Impedance matching of 60 can be achieved. In the drawing, there are two closed loops 41 and 42, and the diameter of the closed loop 41 (hereinafter, referred to as the first closed loop) at the lower end is greater than that of the closed loop 42 (hereinafter referred to as the second closed loop). It is set larger than the diameter. The first closed loop 41 has a larger diameter than the second closed loop 42, and thus has a large inductive reactance value. Accordingly, the first closed loop 41 is sized to have an inductive reactance of a value almost similar to the capacitive reactance of the circuit portion 60. The second closed loop 42 is set to have a fine inductive reactance corresponding to the difference between the inductive reactance formed by the first closed loop 41 and the capacitive reactance of the circuit unit 60. Here, since the tire tag according to the present embodiment is formed by being printed on a two-dimensional plane of the polyimide film, the value of the inductive reactance of the antennas 40 and 50 is finally changed by adjusting the size of the second closed loop 42. Can be. That is, in the two closed loops 41 and 42, the first closed loop 41 is set to have a macroscopic inductive reactance and the second closed loop 41 is set to have a microscopic inductive reactance, thus including a tag chip. The entire circuit unit 60 may be impedance matched with the antenna.

Reference numerals 43 and 44 denote openings 43 and 44 formed in the polyimide film. The openings 43 and 44 allow the tire and the tire tag to be firmly coupled by allowing the tire material (for example, rubber) to enter the opening area when the tire tag formed in the two-dimensional plane of the polyimide film is inserted into the tire. do. In addition, an opening may be formed by removing a polyimide film in the inner regions of the closed loops 41 and 42. Since the tire medium penetrates and fills the area where the opening is formed, the tire and the tag of the tire may be coupled.

Meanwhile, in the tire tag illustrated in FIG. 1, impedance values of the antennas 10 and 20 and impedance values of the circuit unit 30 may be determined by lengths of the coil-shaped antennas 10 and 20. For example, the longitudinal direction of the coil-shaped antennas 10 and 20 may be increased to increase or decrease the impedance value. Similarly, by varying the sizes of the closed loops 41 and 42 in the tire tag shown in FIG. 2, the impedance values of the antennas 40 and 50 may be increased or decreased by substantially increasing or decreasing the lengths of the antennas 40 and 50.

3 shows a modified embodiment of FIG. 2.

In the figure, three fixing grooves A, B, and C are provided inside the tire tag, and the fixing grooves A, B, and C are formed through the two-dimensional plane of the tire tag. When the tire tag of this type is inserted into the tire, the tire material (usually rubber) penetrates into the fixing grooves A, B, and C, and the tire tag is fixedly coupled with the tire material. Although three fixed grooves are illustrated in the drawings, this is only an example, and the number of the fixed grooves may be provided in various numbers according to the characteristics of the tire, and the shape of the fixed grooves A, B, and C may be an ellipse, It will be apparent that the polygon may be triangular, square, star-shaped, and various other shapes. 1 to 3 are attached or embedded between the shoulder inner surface, inner liner, side wall, inside of shoulder, apex, and side wall and inner liner of the tire shown in FIG. Can be.

As described above, the present invention has been described with reference to the accompanying examples and drawings, but the scope of the present invention should not be interpreted as being limited to the above, and the protection scope should be determined by the matters set forth in the claims. something to do.

As described above, according to the present invention, an RFID tag for a tire manufactured by applying a composition for ink containing a silver (Ag) complex compound to a polyimide film has excellent adhesion between the compound and the film, thereby uniformly forming a printed film. Even when the tag is applied to the tire, there is an effect that the tag can operate stably.

In addition, polyimide film has affinity with tires, and polyimide film embedded or attached to tire has less resistance to tires than other materials, and the heat resistance and durability of polyimide film itself have the performance of tags. It can be preserved as it is, and thus can be linked to the pressure change, thermal change, etc. applied to the tire, there is an effect that can mitigate the possibility of physical defects in the tire as well as the tire tag even in the harsh working environment.

In addition, by forming the tire tag in a thin film form, it is possible to suppress the occurrence of internal voids or gaps caused by the stress applied to the tire continuously.

In addition, the ink printed on the polyimide film can produce an RFID tag for a tire to have a high conductivity despite being heat treated at a low temperature, there is an effect of process economy.

Claims (13)

An antenna which is formed by printing a composition for ink containing a silver compound and a silver complex compound obtained by reacting an ammonium carbamate-based or ammonium carbonate-based compound on a polyimide film, and resonating with radio waves transmitted from an RFID reader; And And a circuit unit powered and driven by the radio wave. The circuit portion, At least one closed loop for producing an inductive reactance in the polyimide plane, The two-dimensional planar RFID tag for the tire, characterized in that for canceling the capacitive reactance of the circuit portion through the inductive reactance formed through the closed loop. The method of claim 1, The silver compounds are silver and oxygen, sulfur, halogen, cyano, cyanate, carbonate, nitrate, nitrite, sulfate, phosphate, thiocyanate, chlorate, perchlorate, tetrafluoroborate, acetylacetonate, carboxylate Or a substituent selected from their derivatives is formed in combination, The ammonium carbamate or ammonium carbonate compound

or,

or,

RFID ID tag for a tire of a two-dimensional planar structure, characterized in that at least one material selected from. (Wherein R1, R2, R3, R4, R5 and R6 may be the same or different from each other, each of which is hydrogen, an aliphatic or alicyclic alkyl group having 1 to 30 carbon atoms or an aryl or an aralkyl group which is a mixture thereof , Alkyl and aryl groups substituted with functional groups, and heterocyclic compounds, polymer compounds and derivatives thereof. The method according to claim 1 or 2, The ink composition including the silver complex compound may include silkscreen, spin coating, roll coating, spray coating, dip coating, flow coating, and doctor blade on the polyimide film. Printed and heat-treated by at least one method selected from blade and dispensing, inkjet printing, offset printing, screen printing, pad printing, gravure printing and flexography printing RFID tag for tires of two-dimensional planar structure. The method of claim 3, After printing the heat treatment of the ink composition containing the silver complex compound is an RFID tag for a tire of a two-dimensional planar structure, characterized in that made in the range of 80 ~ 400 ℃. The method of claim 1, Between the antenna and the circuit portion, At least one closed loop is provided, The length of the antenna, The RFID tag for a tire of the two-dimensional planar structure, characterized in that inversely proportional to the diameter of the closed loop. The method of claim 5, The closed loop, A first closed loop and a second closed loop, The first closed loop macroscopically cancels the capacitive reactance of the circuit portion, And said second closed loop partially offsets the capacitive reactance of the circuit portion. The method of claim 6, The first closed loop diameter of the RFID tag for a tire of a two-dimensional planar structure, characterized in that larger than the diameter of the second closed loop. The method of claim 5, The RFID tag is an RFID tag for a tire of a two-dimensional planar structure, characterized in that attached to or embedded in the tire. The method of claim 8, One side of the closed loop is opened, The RFID tag for a tire of a two-dimensional planar structure, characterized in that the material of the tire penetrates into the open area and fixedly coupled to the tire. The method of claim 8, For a tire of a two-dimensional planar structure, characterized in that it is provided on any one of the inner surface of the shoulder (shoulder) of the tire, the inner liner, the side wall, the inside of the shoulder, the apex, and the side wall and the inner liner. RFID tag. The method of claim 8, On one side of the RFID tag, A coupling groove penetrating the RFID tag is provided. The coupling groove is an RFID tag for a tire of a two-dimensional planar structure, characterized in that to allow the material constituting the tire to penetrate and fixedly coupled to the tire. The method of claim 11, The coupling groove, RFID ID tag for a tire of a two-dimensional planar structure, characterized in that the shape of any one of circles, ellipses, and polygons. The method of claim 5, The closed loop, The diameter of the antenna is determined to match the impedance of the antenna and the circuit part. The sum of the impedance formed by the diameter and the impedance of the antenna is equal to the input impedance of the circuit portion RF ID tag for a tire of the two-dimensional planar structure method.

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