KR20060132299A - Tuning method for radio frequency characteristics and rfid tag using the said tuning method - Google Patents

Abstract

A method for tuning RF(Radio Frequency) characteristics and an RFID tag using the same are provided to tune an oscillation frequency of the RFID tag to represent an optimal recognition coverage with a simple operation after the RFID tag is completely manufactured. An antenna is formed on an antenna substrate(S1). An RF tuning pattern is previously formed to an outer side of the antenna substrate(S2). An RFID tag IC chip is adhered to the antenna substrate and is electrically connected to the antenna(S3). A part of the antenna substrate is folded according to a use environment to tune the oscillation frequency of the RFID tag(S5).

Description

Tuning method for radio frequency characteristics and RFID tag using the said tuning method}

1 is a plan view illustrating a conventional RFID tag prior to attachment of the bridge circuit assembly.

2 is a flowchart illustrating a method of tuning radio frequency characteristics according to a first embodiment of the present invention.

3 is a flowchart illustrating a method of tuning radio frequency characteristics according to a second preferred embodiment of the present invention.

4 is an exploded perspective view showing an RFID tag according to a first preferred embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4.

6 is an exploded perspective view showing an RFID tag according to a second preferred embodiment of the present invention.

Fig. 7 is an exploded perspective view showing an RFID tag according to a third preferred embodiment of the present invention.

8 is an exploded perspective view showing an RFID tag according to a fourth preferred embodiment of the present invention.

9 is an exploded perspective view showing an RFID tag according to a fifth embodiment of the present invention.

Brief description of symbols for the main parts of the drawings

1: RFID tag base 2: Base board

3, 125, 225, 325, 425, 525: antenna 3a: first end 3b: second end 3c: plural coils

4 Tuning Capacitor Board 4a Tuning Capacitor Board Connections 110, 210, 310, 410, 510: RFID Tag

120, 220, 320, 420, 520: antenna board

121, 221, 321, 421, 521: crimping connection

123, 223, 323, 423, 523: RFID Tag Integrated Circuit Chip

124: Anisotropic Conductive Film

125, 225, 325, 425, 525: antenna

127, 227, 327, 427, 527: aluminum foil

130, 330, 430: protective paper 131, 132, 133: adhesive

135, 235, 335, 435, 535: tuning pattern

138, 238, 340, 440, 540: guide parts 341, 441, 541: metal foil

The present invention relates to a radio frequency identification tag (RFID tag), and more particularly, to a method for tuning radio frequency characteristics of RFID and an RFID tag using the same.

RFID tags can be applied to various applications such as logistics management markers, electronic identification cards, electronic money, and credit cards by inputting various information into integrated circuit chips. The RFID tag has initial setting data inputted in a contact or non-contact manner. That is, a predetermined operation is performed by the contact substrate formed on the electronic wireless recognition device contacting the input terminal of the terminal, or the initial information is recorded by the RFID tag writer or the like. In actual use, once the initial information has been recorded, data is transmitted and received in a non-contact manner by communication between the RFID tag and the terminal using radio frequency.

For transmitting and receiving such contactless electrical energy or information, the RFID tag includes an antenna forming a single antenna or at least one single closed loop, and an integrated circuit chip electrically connected to the at least one antenna.

In this case, the antenna converts the energy from the transmitter into radio waves to efficiently transmit electrical energy or information through the space without using a transmission line, thereby efficiently copying the radio waves copied into the space. Therefore, information from the outside of the RFID tag is stored and updated in the integrated circuit chip of the RFID tag through the antenna formed in the RFID tag, or information stored in the integrated circuit chip is transmitted to the outside.

However, since the radio wave radiated from the antenna is changed according to the shape of the antenna, the manufacturing frequency of the RFID tag antenna may be different from the original resonant frequency due to manufacturing tolerances in the actual manufacturing process. Since the required recognition distance may vary depending on the surrounding environment, resonant frequency tuning should be performed to indicate the optimum recognition distance.

A method of changing the resonant frequency of a conventional RFID tag circuit is disclosed in Korean Patent Laid-Open No. 10-2004-0021635. The configuration and problems thereof are as follows.

1 is a plan view illustrating a conventional RFID tag prior to attachment of the bridge circuit assembly. Referring to the drawings, the RFID tag base 1 includes a circuit pattern on the first major surface of the base substrate 2. This circuit pattern includes an antenna having a first end 3a, a second end 3b and a plurality of coils 3c. The circuit pattern also includes a set of tuning capacitor plates 4 in electrical communication with the antenna 3 via the tuning capacitor plate connections 4a. The resonant frequency of the circuit formed above the RFID tag cuts some of the selected connections 4a to one or more tuning capacitor plates 4 which form part of the capacitor structure or changes the capacity of the circuit, and then the changed capacity of the circuit Tuning is done in a manner that changes the resonant frequency.

However, this type of conventional technology does not manufacture the finished product of the RFID tag, but only the antenna tagging and chip bonding process, that is, the schedule of the RFID tag circuit without the paper labeling process. There is a need for a process of cutting or additionally attaching parts. Therefore, there is a problem in that it takes a long time and a hassle to attach the protective paper in the reel-to-reel line again after the process for tuning. In addition, since the tuning process itself does not fit in the reel to reel process, there is a problem in that it is difficult to apply the above prior art to mass production.

The present invention is to solve the above problems, and after manufacturing the finished RFID tag product provides a tuning method of the radio frequency characteristics that can tune the resonant frequency to display the optimum recognition distance with a simple operation and provides an RFID tag using the same. Its purpose is to.

In order to achieve the above object and various other objects, the present invention comprises the steps of forming an antenna on the antenna substrate; Creating a radio frequency tuning pattern outside the product of the antenna substrate in advance; Bonding an RFID tag integrated circuit chip to the antenna substrate, and electrically connecting the RFID tag integrated circuit chip to the antenna; And folding a part of the antenna substrate in accordance with a use environment to tune the resonant frequency.

Here, the tuning method of the radio frequency characteristics, it is preferable to further comprise the step of forming a guide portion to be folded later.

The guide part may be formed at least one place where the shape of the tuning pattern is different from the shape of the tuning pattern before folding, after folding.

Further, according to another aspect of the invention, forming an antenna on the antenna substrate; Bonding an RFID tag integrated circuit chip to the antenna substrate, and electrically connecting the RFID tag integrated circuit chip to the antenna; Forming a guide part for tuning the resonant frequency; And attaching a metal foil to the formed guide part according to the use environment to tune the resonant frequency.

In addition, according to another aspect of the invention, the antenna substrate; An RFID tag integrated circuit chip adhered to the antenna substrate; An antenna formed on the antenna substrate and electrically connected to the RFID tag integrated circuit chip; Tuning pattern; And it provides an RFID tag having a guide for the tuning pattern.

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

2 is a flowchart illustrating a method of tuning radio frequency characteristics according to a first embodiment of the present invention. 4 is an exploded perspective view showing an RFID tag according to the first embodiment of the present invention of FIG. 2, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4, and FIG. 6 is a second preferred embodiment of the present invention. It is an exploded perspective view which shows the RFID tag which concerns on an example.

Referring to the drawings, an antenna is formed on the prepared antenna substrates 120 and 220. (s1) Here, the antenna substrates 120 and 220 should be larger than the antenna substrate used for a normal RFID tag. Because finally, you need a collapsible space for tuning.

After the antennas 125 and 225 are formed on the antenna substrates 120 and 220, the antennas 125 and 225 are not formed so that the tuning patterns 135 and 235 overlap with the antennas 125 and 225. Tuning patterns 135 and 235 are formed outside the antenna substrates 120 and 220. (s2) The tuning patterns 135 and 235 are formed of a copper foil layer or a thin aluminum layer laminated on the antenna substrates 120 and 220. When the antenna is formed by an etching method formed by removing by etching or a screen mask method formed by printing conductive ink on the antenna substrates 120 and 220, the antennas may be formed together. In addition, in the etching method, a method of punching and cutting the tuning patterns 135 and 235 and attaching them to the antenna substrates 120 and 220 in order to prevent waste of materials and an increase in manufacturing cost caused by etching a large area is also used. Could be. However, the order in which the antennas 125 and 225 and the tuning patterns 135 and 235 are formed is not necessarily limited to that shown in FIG. 2, and in another embodiment, the tuning patterns 135 and 235 may be formed by the antennas 125 and 235. Even before the step of forming 225. The tuning patterns 135 and 235 are made together when the antennas 125 and 225 are formed so that both materials are the same. As illustrated in FIG. 6, the tuning patterns 135 and 235 may be formed in various shapes.

Thereafter, the RFID tag integrated circuit chips 123 and 223 are bonded to the antenna substrates 120 and 220, and the RFID tag integrated circuit chips 123 and 223 are electrically connected to the antennas 125 and 225. s3) Here, the RFID tag integrated circuit chips 123 and 223 may be flip chip bonded or wire bonded by the anisotropic conductive adhesive 124. Flip chip bonding is a method in which the anisotropic conductive film adhesive 124 is interposed between pads of the RFID tag integrated circuit chips 123 and 223 and both ends of the antennas 125 and 225 so that the two are electrically connected. Wire bonding forms a silver plating layer at the ends of the antennas 125 and 225, and then connects the pads of the RFID tag integrated circuit chips 123 and 223 and the silver plating layer with wires. In addition, if the shape of the antenna (125, 225) to form a closed circuit, one end and the other end of the antenna (125, 225) should be electrically connected. In this connection method, in order for the antennas 125 and 225 to form a closed circuit, both ends of the antennas 125 and 225 arranged in a coil shape may be connected through an aluminum foil and a crimping connection. have. In addition, both ends of the antennas 125 and 225 may be connected by terminals made of silver via portions insulated with solder resist.

On the other hand, the antenna 125, 225 and the RFID tag integrated circuit chip 123, 223 is folded to tune the resonant frequency to the outer edge of the portion where the antenna 125, 225 of the antenna substrate (120, 220) is bonded In other words, the guide parts 138 and 238 are formed in advance. (S4) At least one of the above guide parts 138 and 238 may be formed. It is preferable to form at one or more plural places, since the amount that can be tuned by the number 238 can vary. As shown in FIG. 2, not only the bonding step between the antennas 125 and 225 and the RFID tag integrated circuit chips 123 and 223 but also the forming step of the guide parts 138 and 238 may be performed in the previous step. Here, the guide parts 138 and 238 are intended to facilitate folding the RFID tag for tuning after completion of the manufacturing process, and thus may be formed by cutting the antenna substrates 120 and 220 to a medium level. . As another embodiment of FIG. 2, when the protective paper 130 is attached to the upper surfaces of the antenna substrates 120 and 220, the guide parts 138 and 238 may be formed on the protective paper 130. In addition, when the protective paper 130 is used and the RFID tag is attached to the product by folding for tuning, the upper surface of the protective paper 130 of the RFID tag being folded in a subsequent folding step so that the RFID tag is easily attached to the product. It is preferable that the double-sided adhesive agent 132 is attached to the part.

After the completion of the RFID tag product, if you want to use it at a distance other than the proper recognition distance of the RFID tag or if there is a difference between the target design resonance frequency and the actual resonance frequency after fabrication, the guide part ( The resonance frequency is changed by changing the shape of the tuning patterns 135 and 235 by folding along 138 and 238. (s5) Here, in the former case, the resonance frequency of the RFID tag is compared with the target resonance frequency by manufacturing tolerances. It is necessary to measure the resonant frequency of the RFID tag to check whether it has changed. On the other hand, the amount of change on the resonance frequency of the RFID tags 110 and 210 when the guides 138 and 238 are folded along the guides 138 and 238 is predetermined. Therefore, the selection of which guides 138 and 238 should be folded along is determined by measuring the difference between the resonance frequency of the actual RFID tag and the resonance frequency of the target RFID tag.

3 is a flowchart illustrating a method of tuning radio frequency characteristics according to a second preferred embodiment of the present invention. 7 is an exploded perspective view showing an RFID tag according to a third preferred embodiment of the present invention using a metal foil, and FIG. 8 is an exploded perspective view showing an RFID tag according to a fourth preferred embodiment of the present invention. Is an exploded perspective view showing an RFID tag according to a fifth preferred embodiment of the present invention.

A description of the tuning method of the radio frequency characteristics according to the second preferred embodiment of the present invention will be described with reference to the differences from the first embodiment of the present invention. Referring to the drawings, first, antennas 325, 425, and 525 are formed on the prepared antenna substrates 320, 420, and 520. (s10) Here, in the third embodiment shown in FIG. The size of is larger than that of an antenna substrate for an ordinary RFID tag. In the case of the third and fourth embodiments shown in FIGS. 8 and 9, the sizes of the antenna substrates 420 and 520 are the same as those of the antenna substrate for a normal RFID tag.

Thereafter, the RFID tag integrated circuit chips 323, 423, and 523 are bonded to the antenna substrate 320, 420, and 520, and the RFID tag integrated circuit chips 323, 423 and 523 are connected to the antennas 325, 425, and 525. (S20).

After the RFID tag manufacturing process is completed, the positions where the metal foils 341, 441, and 541 are to be attached, that is, the guide parts 340, 440, and 540, are printed in advance (s30). Here, various embodiments may exist. 7 and 8, when the protective papers 330 and 430 are used on the upper surfaces of the antenna substrates 320 and 420, the guide parts 340 and 440 are printed on the protective papers 330 and 430. When the protective paper is not used as shown in FIG. 9, it is preferable to print the guide part 540 on the antenna substrate 520 on which the antenna 525 is formed by using a medium such as non-conductive ink. At least one upper guide part 340, 440, 540 may be formed. If a plurality of printed parts are printed, the number of combinations of the number of metal foils 341, 441, 541 attached to the resonant frequency tuning and the attachment position may be adjusted. Since the amount of change in the resonant frequency that can be obtained by applying a change also varies, it is preferable to print a plurality.

After the completion of the RFID tag product, if you want to use it at a distance other than the proper recognition distance of the RFID tag or if there is a difference between the target design resonance frequency and the actual resonance frequency after fabrication, the guide part ( The resonant frequency is changed by additionally attaching the metal foils 341, 441, 541 to the 340, 440, and 540. (s5) Here, in the case of the former, the resonant frequency of the RFID tag is compared with the target resonant frequency by manufacturing tolerances. It is necessary to measure the resonant frequency of the RFID tag (310, 410, 510) to see if the change. On the other hand, the amount of change on the resonance frequency of the RFID tag when attached to the guide portion 340, 440, 540 for each guide portion 340, 440, 540 is predetermined. Here, in the fifth embodiment shown in FIG. 9, since the metal foils 341, 441, and 541 are conductive materials, the antennas 325, 425, and 525 are not formed to maintain insulation from the antennas 325, 425, and 525. It should be attached to the surface of the antenna substrate 320, 420, 520. Meanwhile, in the third and fourth embodiments illustrated in FIGS. 7 and 8, the protective papers 330 and 430 are attached to the upper surfaces of the antenna substrates 320 and 420 using an adhesive.

4 is a perspective view illustrating an RFID tag according to a first preferred embodiment of the present invention, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4, and FIG. 6 is a second preferred embodiment of the present invention. It is a perspective view which shows the RFID tag.

Referring to the drawings, the RFID tags 110 and 210 may include the antenna substrates 120 and 220, the RFID tag integrated circuit chip, the antennas 125 and 225, the protective paper 130, the tuning patterns 135 and 235, and the adhesive 31. , 32, 33 and printed guide portions 138, 238.

The antenna substrates 120 and 220 are thin substrates such as flexible printed circuit boards, and any substrate may be used as long as there is no problem in that electromagnetic force caused by an electric field formed around the electrode acts on the back side thereof. For example, it may be paper or a poly ethylene terephthalate (PET) film. Since the antenna substrates 120 and 220 must have a seat for attaching the tuning patterns 135 and 235 or the metal foil to one corner portion, the antenna substrates 120 and 220 are larger than the antenna substrates 120 and 220 of the ordinary RFID tags 110 and 210. desirable.

The RFID tag integrated circuit chips 123 and 223 are semiconductor chips in which various necessary data are stored.

The antennas 125 and 225 are formed on one surface of the antenna substrate 120 and 220, are electrically connected to electrode pads provided in the RFID tag integrated circuit chips 123 and 223, and have a predetermined resonance frequency. It is designed to receive new information through wireless communication with a reader (not shown) and store it in the RFID tag integrated circuit chips 123 and 223 or transmit the stored information to the reader. In FIG. 4, one end and the other end of the antennas 125 and 225 have a crimping method or a solder resist method to form a closed circuit in which the antennas 125 and 225 have a form of a closed circuit having a plurality of coils. Is electrically connected.

The protective paper 130 may have adhesives 33 formed on the upper surfaces of the antenna substrates 120 and 220 to protect the antenna substrates 120 and 220 on which the antennas 125 and 225 and the RFID tag integrated circuit chips 123 and 223 are formed. ) Is attached. Although FIG. 5 illustrates that the protective paper 130 is provided, the protective paper 130 may not necessarily be provided with the protective paper 130.

The tuning patterns 135 and 235 are disposed on the antenna substrates 120 and 220 outside the antennas 125 and 225, and the copper foil layer or the thin aluminum layer laminated on the antenna substrates 120 and 220 is removed by etching. Can be formed together when the antennas 125 and 225 are formed by an etching method or a screen mask method by printing conductive ink on the antenna substrates 120 and 220. In addition, a method of punching and cutting the tuning patterns 135 and 235 and attaching them to the antenna substrates 120 and 220 may be used. Thus, the material of the tuning patterns 135 and 235 is the same as the material of the antennas 125 and 225. Meanwhile, the shapes of the tuning patterns 135 and 235 may be modified in various shapes as shown in FIG. 6 as well as the shapes shown in FIG. 4.

The adhesives 131 and 133 are interposed on the bottom surface of the protective paper 130 and the bottom surfaces of the antenna substrates 120 and 220, respectively, to be used for attaching the protective paper 130 and the release paper (not shown) to the antenna substrates 120 and 220. Can be. Here, the release paper is removed when the RFID tags 110 and 210 are finally attached to the goods to be used, thereby attaching the RFID tags 110 and 210 to the goods. However, when the protective paper 130 is not used, the adhesives 131 and 133 are not necessary. On the other hand, it is preferable that the adhesive agent 132 is also adhered to the part which is folded 180 degrees in the downward direction among the upper surfaces of the protective paper 130. However, the adhesive 131, 132, 133 is not necessarily required when the RFID tags 110 and 210 are inserted into the product instead of being attached thereto.

The guide parts 138 and 238 are formed on the antenna substrates 120 and 220 outside the antennas 125 and 225, and are preferably formed in plural places. In addition, the formation positions of the guide portions 138 and 238 and the shapes of the tuning patterns 135 and 235 are appropriately determined so that the shapes of the tuning patterns 135 and 235 may be changed when the guide portions 138 and 238 are folded along the guide portions 138 and 238. It is preferable. In addition, when the positions where the respective tuning patterns 135 and 235 and the guide parts 138 and 238 are to be determined are determined, when the specific tuning patterns 135 and 235 are folded for each of the guide parts 138 and 238. It is preferable that the amount of change of the resonance frequency to be brought in be predetermined.

By the above configuration, the RFID tags 110 and 210 according to the first and second exemplary embodiments of the present invention have all the manufacturing processes completed, that is, the protective paper 130 is attached to the antenna substrates 120 and 220. After that, the resonance frequency of the RFID tags 110 and 210 is measured to determine whether the target resonance frequencies of the RFID tags 110 and 210 are changed by manufacturing tolerances. If there is a difference between and needs to be tuned, the resonance frequency can be changed by finally folding 180 degrees along the guide parts 138 and 238 to change the shape of the tuning patterns 135 and 235 and 35. In addition, since the amount of change on the resonant frequencies of the RFID tags 110 and 210 when the guides 138 and 238 are folded along the upper guides 138 and 238 is set in advance, The guide parts 138 and 238 can be selected and folded to measure the difference between the resonant frequencies of the target RFID tag and correct the difference best. Then, the release paper is attached to the adhesive 131 located on the bottom surface of the antenna substrates 120 and 220, and then the release paper is removed and attached when the product to use the RFID tags 110 and 210 is attached.

7 is a plan view showing an RFID tag according to a third embodiment of the present invention. The following description will focus on differences from the first and second embodiments of the present invention using tuning patterns. Referring to the drawings, the RFID tag 310 according to the third embodiment includes an antenna substrate 320, an RFID tag integrated circuit chip 323, an antenna 325, a protective paper 330, a metal foil 341, and a printed guide. The unit 340 is provided.

A plurality of guide portions 340 for indicating the position where the metal foil 341 is to be attached to one corner portion of the protective paper 330 are printed. Therefore, it is not necessary to print the guide portion 340 on the antenna substrate 320 in advance, and is the same as the existing reel to reel process, there is no need to change the work process or line. The position at which the guide part 340 is printed is one corner of the protective paper 330 so as to be located outside the antenna 325, and the distance between the guide parts 340 is appropriately selected according to the size of the metal foil 341. desirable.

The metal foil 341 is for changing the resonant frequency of the antenna 325. The material is conductive and preferably the same as the material of the antenna 325. The shape of the metal foil 341 may be variously modified. The metal foil 341 is attached to the upper surface of the protective paper 330 through an adhesive.

By the above configuration, after the conventional reel-to-reel process is finished, the resonant frequency of the RFID tag 310 is measured, and the resonant frequency of the actual RFID tag 310 is different from the target value. By attaching a metal foil 341 to a part of the guide portion 340 printed on the protective paper 330, it is possible to tune the resonance frequency of the RFID tag 30.

8 is an exploded perspective view showing an RFID tag according to a fourth preferred embodiment of the present invention. Referring to the drawings, the RFID tag 410 according to the fourth embodiment includes an antenna substrate 420, an RFID tag integrated circuit chip 423, an antenna 425, a protective paper 430, a metal foil 441, and a printed guide. The unit 440 is provided.

The size of the antenna substrate 420 is the same as that of an ordinary RFID tag. Since the protective paper 430 is in contact with the antenna substrate 420 with an insulating material, a short circuit does not occur due to the protective paper 430 even when the metal foil 430 is positioned above the antenna 410. Therefore, the guide part for attaching the metal foil 441 to a suitable position on the protective paper 430 is printed in advance. Finally, if tuning is necessary, the resonant frequency of the RFID tag 410 can be tuned by attaching a metal foil 441 to a part of the guide part 440 printed on the protective paper 430.

9 is an exploded perspective view showing an RFID tag according to a fifth embodiment of the present invention. Referring to the drawings, the RFID tag 510 according to the fifth embodiment includes an antenna substrate 520, an RFID tag integrated circuit chip 523, an antenna 525, a metal foil 541, and a printed guide 540. Equipped.

The size of the antenna substrate 520 is the same as that of an ordinary RFID tag. Therefore, the guide portion 540 for attaching the metal foil 541 to the proper position on the antenna substrate 520 is printed in advance. If it is necessary to finally tune, the guide part 340 printed on the surface of the antenna substrate 520 where the antenna 525 is not formed in order to prevent the antenna 525 from being short-circuited by the metal foil 541. By attaching a metal foil 541 to some of the) it is possible to tune the resonant frequency of the RFID tag 510.

According to a tuning method of radio frequency characteristics according to the present invention, the method includes: forming a tuning pattern on an antenna substrate in advance; And folding along the guide portion.

According to another aspect of the tuning method of the radio frequency characteristics according to the present invention, the step of forming in advance a guide for attaching the metal foil; And attaching a metal foil.

According to the RFID tag according to the present invention, there is provided an antenna substrate including a guide part; RFID tag integrated circuit chip; And a tuning pattern.

According to another aspect of the RFID tag according to the invention, the antenna substrate; RFID tag integrated circuit chip; antenna; And metal foil.

Therefore, due to the difference in resonance frequency due to manufacturing tolerances or the difference in recognition distance required. After the fabrication process is completed, the resonant frequency can be tuned to show the optimum recognition distance by simply folding the guide part in response to the required resonant frequency change value or by additionally attaching a metal foil to the preprinted guide part.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (5)

Forming an antenna on the antenna substrate; Creating a radio frequency tuning pattern outside the product of the antenna substrate in advance; Bonding an RFID tag integrated circuit chip to the antenna substrate, and electrically connecting the RFID tag integrated circuit chip to the antenna; And And folding a portion of the antenna substrate in accordance with the use environment to tune the resonant frequency. The method of claim 1, The tuning method of the radio frequency characteristics, the method of tuning the radio frequency characteristics further comprises the step of forming a guide portion to be folded later. The method of claim 2, And at least one guide portion is formed after the folding so that the shape of the tuning pattern is different from the shape of the tuning pattern before folding. Forming an antenna on the antenna substrate; Bonding an RFID tag integrated circuit chip to the antenna substrate, and electrically connecting the RFID tag integrated circuit chip to the antenna; Forming a guide part for tuning the resonant frequency; And And a step of attaching a metal foil to the formed guide part according to the use environment to tune the resonant frequency. An antenna substrate; An RFID tag integrated circuit chip adhered to the antenna substrate; An antenna formed on the antenna substrate and electrically connected to the RFID tag integrated circuit chip; Tuning pattern; And RFID tag having a guide for the tuning pattern.

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