WO2006080615A1

WO2006080615A1 - Eyelet for radio frequency identification and method for manufacturing the eyelet

Info

Publication number: WO2006080615A1
Application number: PCT/KR2005/003096
Authority: WO
Inventors: Yong Woong Ryu
Original assignee: Rfcamp Ltd.
Priority date: 2004-09-17
Filing date: 2005-09-16
Publication date: 2006-08-03
Also published as: KR20060025885A; KR100617480B1

Abstract

Provided is an eyelet for RFID and a method of manufacturing the eyelet, which can perform contactless identification, including an eyelet base composed of conductive material and formed of a ring portion closely attached to an object and a fastening portion and an RFID circuit module installed at the eyelet base to use the eyelet base as an antenna. A slit is formed in the eyelet base, and the RFID circuit module is electrically connected to parts defined by the slit to use the eyelet base as an antenna. The antenna is composed of conductive material, thereby performing data transmission/reception without interference. An existing eyelet structure is used, thereby increasing the output and reducing the cost of manufacturing the RFID tag, and performing strong coupling

Description

EYELET FOR RADIO FREQUENCY IDENTIFICATION AND METHOD FOR

MANUFACTURING THE EYELET

Technical Field The present invention relates to a tag using radio frequency identification

(RPID) technology, and more particularly, to an RFID tag that can be applied regardless of the type and shape of an object requiring auto-identification and has many uses.

Background Art Radio frequency identification (RFID) tags generally indicate devices formed of an IC chip, an antenna, and adhesive material and transmitting or receiving predetermined data with an external reader or interrogator. RFID tags may be called as transponders. RFID tags transmit or receive data with a reader by using a contactless method. According to the amplitude of a used frequency, inductive coupling, backscattering coupling, and surface acoustic wave (SAW) may be used. Using electromagnetic waves, data may be transmitted or received to or from a reader by using a full duplex method using the electromagnetic wave, a half duplex (HDX) method, and a sequential (SEQ) method.

For example, RFID tags are used in managing products due to the property of the contactless method and used multiple times for an IC card for payment or a pass.

Considering frequency band, low frequency bandwidth such as 135 KHz and 13.56 MHz are conventionally used and the use of ultra high frequency (UHF) of 900 MHz is notably increased in a current administration of physical distribution. Particularly, RFID is used for the administration of physical distribution in a big organization such as Wal-Mart, or the Pentagon of the U.S.A with a large distribution system. In this case, the UHF bandwidth using backscattering coupling is substantially used and passive tags stimulated with respect to an external scan and generating a required current without a built-in battery have been recognized as standard for some time. There are a method of laminating a tag to make a card, a method of using an adhesive material such as a sticker, and a method of forming a tag in a single body by using injection molding as methods of applying RFID technology. The method of directly inserting a tag into a package or garment without additional adhesion has merits in which engagement is not required and reuse is possible but has demerits in which a risk of loss is great and a tag may be easily damaged by an external impact. The form of a laminated card may protect an RFID chip from a change of external environments and easily carried such as in a wallet of a user, but is difficult to be attached to a product or engaged for use, thereby being restricted in use. Also, in the case of a sticker, it is assumed to be generally used more than the other described methods but is restricted in adhesive strength and durability in harsh environments. Since a tag formed by molding protects an RFID chip, the tag may be used in harsh environments. However, the tag manufacturing by molding may not be reused because an RFID component can not be separated to be used for another purpose, and has a manufacturing process more complicated than other forms of use, and is relatively high-priced. As described above, an RFID tag is formed of an IC chip, an antenna, and an adhesive material. A substrate formed in the shape of a film composed of any type of plastic material such as PVC, PCB, PE, and PA is used. The substrate is formed in a thickness less than approximately 100 μm, and an antenna is formed above the substrate.- A conducting wire of the antenna may be installed on the substrate together with a chip or connected to an IC chip outside the substrate by using a direct bonding method or a chip-on-board (COB) method. The RFID tag may be partly coated by using an epoxy resin for the stability of connection between the IC chip and the conducting wire.

Generally, the size of the RFID tag is determined by various features such as the size of a chip, the size of an antenna, the degree of technical skill, and whether a battery is installed according to an active or passive method. Currently, since technical levels with respect to the size of a chip and the degree of technical skill have been notably improved, the size of an RFID tag is substantially dependent upon the size of an antenna. The size of an antenna may become larger as the size of reading range required in a reader becomes larger, become smaller as emitted power of a reader becomes greater, and become smaller as a used frequency becomes high. In the case data is transmitted and received by backscattering while using frequency in a bandwidth higher than UHF, the degree of backscattering is dependent upon the size and shape of an antenna, geological features, surface structure, wavelength, and polarization and has an improved efficiency when an antenna of metal material is used. Therefore, in the case of generally used existing tags in a frequency bandwidth of less than 13.56 MHz, there are basic limitations in which an antenna has to be formed in the type of a coil by using an inductive coupling method, the size of the antenna has to be more than several meters, and external housing may not be composed of metal material. As an RFID tag using frequency higher than approximately 900 MHz and backscattering becomes generally used in such a physical distribution area, the limitation on the size of an antenna and the material of housing becomes relaxed. Particularly, housing formed of metal material may be used and the size of an antenna and tag may be reduced. Also, in the case of a backscattering method, the problem of directivity between a reader and an RFID tag is relieved more than the inductive coupling method, thereby relaxing the limitation on the shape of tags.

Disclosure of Invention Technical Goals

As described above, the shape of a conventional RFID tag has at least one of the following problems in which 1) there may be poor adhesive strength in harsh environments, 2) chip reliability is difficult to guarantee in harsh environments, 3) a process of manufacturing a tag, particularly, a process of manufacturing an antenna is complicated and has high costs.

The present invention provides an RFID tag that can easily integrate or install a tag by using a conventional eyelet integrating device or an improved eyelet integrating device and has a structure favorable to maintain adhesion or chip durability more than a conventional RFID tag.

The present invention also provides an RFID tag that can satisfy the function of maintaining an engagement of an object through a hole, which is possible in a conventional eyelet base, and a function supplementary to the engagement of an eyelet base or rivet of an eyelet washer which is perform by the RFID tag function. The present invention also provides an RFID tag in which an eyelet composed of metal such as aluminum, that is generally readily reused, is used as an antenna, thereby readily reusing the tag. The present invention also provides an RFID tag that has superiority in the cost of raw material of an RFID tag, is economic by simplifying a manufacturing process of an antenna, and does not use an additional adhesive agent, thereby obtaining merits in manufacturing cost and manufacturing process. The present invention also provides an RFID tag that uses a metallic antenna and RFID circuit module in an eyelet, thereby minimizing space and ratio of being occupied by the tag itself.

The present invention also provides an RFID tag having a structure, in which various shapes, appearance, and colors may be shown, and being valuably utilized in other uses in addition to a tag.

Technical Solutions

According to an aspect of the present invention, there is provided an eyelet for RFID, in which an eyelet base and an RFID circuit module installed in a slit formed in the eyelet base are included, the flow of current in the eyelet base is restricted by the slit to pass via a certain path such that the terminals of the RFID circuit module are connected to each separated part, thereby using the eyelet base as a dipole antenna.

Eyelets are already used in many fields and engagement devices and manufacturing methods are also widely provided, as such eyelets are already mass- produced. Accordingly, in comparison with a conventional high-priced RFID tag, the cost of manufacturing may be notably reduced. However, since an eyelet structure composed of conductive material is used, the eyelet itself is used as an antenna by using the slit.

A ring portion including the slit is above the eyelet base, and a fastening portion passing through an object to be fastened is below the eyelet base. The ring portion includes a protrusion protruded upward from around the inner edge and formed as a flat, circular tile from the inner edge to the outer edge thereof. The ring portion includes a cap surrounding the ring portion to prevent from deformation while the fastening portion is processed to be anchored to the object. The cap is transparent so that the slit of the ring portion is shown. Specifically, the RFID circuit module installed at the bottom of the eyelet base is externally visible so that it is recognized that an eyelet is used as an RFID tag. An end of the cap, which is folded downward, is wound towards the ring portion and fastened. The thickness of the cap may be approximately 0.5 mm, and the length of the folded end may be approximately 3 to 4 cm.

The fastening portion is formed of a plurality of legs extended downward from the inner edge and disposed at a predetermined interval. The legs may be formed in the shape of a tripod whose legs are disposed at a certain interval below the ring portion.

Also, in the case the fastening portion of the eyelet base passes through the object to fasten the eyelet base itself to the object, the plurality of the legs forming the fastening portion pass through the object, the lower end of the legs are constricted by a fastening block having a concave groove, and the legs are wound toward the object along the groove to fasten the eyelet base to the object. Also, in another way, the fastening portion is folded outward, thereby fastening the eyelet base to the object.

In this case, the press block pressurizing the fastening portion of the eyelet base is paired with a fastening block fastening the ring portion of the eyelet base to fasten the eyelet base to the object.

The RFID circuit module for performing RFID function is formed as an IC chip and installed below the slit of the eyelet on which the cap is placed by die bonding. The eyelet base is composed of metal material to function as an antenna of the RFID circuit module. In this case, with a frequency of more than approximately 2 GHz, the size of a conventional eyelet may sufficiently function as an antenna. However, with a frequency of 900 MHz, a conventional sized eyelet can not sufficiently perform as an antenna.

For example, smooth communication is possible by using a dipole antenna of approximately 15 to 16 cm in a frequency more than approximately 900 MHz. However, if an eyelet is manufactured as approximately in the size of 15 cm, an essential function of an eyelet may be diminished.

To solve this, in the eyelet for RFID, according to the present invention, an antenna extension portion is electrically connected to a built-in antenna, thereby enlarging the size of an antenna in an RFID circuit, as required.

The antenna extension portion may be composed of an aluminum tape, a conductive paint, or a conductive sheet and may be applied to the object to enlarge the size of the antenna. Also, since the process of forming the antenna extension portion is simple and cheap, common use is very easy.

Since the eyelet is used as an antenna, comparing with a manufacturing process of conventional RFID tag, the manufacturing process of the RFID tag may be notably simplified and an RFID circuit module may be firmly fastened to an object to maintain and improve the function of conventional eyelets generally used. Also, since a conventional eyelet engagement unit may be used as is, it is very economical. The eyelet washer and the eyelet base may be used as an antenna, may effectively protect an IC chip for RFID₅ and may be securely fastened by using the structure of the eyelet closely attached and firmly fastened to the object under harsh environments.

In addition, since eyelets are used in many fields in the real world, fields of application and a ripple effect on the application may be enormously increased. The process of manufacturing and installing is also simple and many manufacturing facilities of eyelets already exist, thereby notably reducing the cost of RFID tags. For example, an eyelet may be used in a tag used for identifying freights of trains, stocks in storages, and products being sold in all types of markets. In this case, if a conventional ordinary eyelet is replaced by an eyelet for RFID, information on freight may be automatically recognized instead of checking individually and a case of losing or erroneous sending of freight or product may be prevented. Also, the eyelet for RFID may endure external impact or harsh environments and may protect the RFID chip. Also, if the RFID tag is engaged with freight by using a rubber band or a wire, the tag may be separated and reused.

In addition, in not only fields in which eyelets are used, such as clothes, shoes, shading tent, tent for construction materials, but also fields in which eyelets are currently not used, the eyelets for RFID may be simply fastened to various objects by using conventional eyelet engaging unit and contactless identification technology using RFID via the eyelet for RFID may be applied.

In a conventional eyelet, conductive material such as metal is not used as housing for an RFID tag because the conductive material may interfere with transmission/reception between a reader and the RFID tag. However, in the present invention, since the housing is composed of metal material and may be used as an antenna, there are many merits in manufacturing, using, and protecting the antenna. Brief Description of Drawings

FIG. 1 is a perspective view illustrating an eyelet base of an eyelet for RFID, according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of A-A' of FIG. 1;

FIG. 3 is a perspective view illustrating the eyelet base and a cap according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view illustrating the cap installed on a ring portion of the eyelet base according to an embodiment of the present invention; FIG. 5 is a front view illustrating the eyelet for RFID, according to an embodiment of the present invention, installed on an object by a fastening block;

FIG. 6 is a front view illustrating the eyelet for RFID, according to an embodiment of the present invention, installed on the object;

FIG. 7 is a cross-sectional view of B-B' of FIG. 6; FIG. 8 is a cross-sectional view illustrating an RFID circuit module disposed in the eyelet for RFID, according to an embodiment of the present invention;

FIG. 9 is a top view illustrating the eyelet for RFID, according to an embodiment of the present invention, installed at the object; and

FIGS. 10 through 17 are perspective views, front views, top views, and cross- sectional views illustrating a process of manufacturing an eyelet for RFID according to a method of manufacturing the eyelet for RFID, according to another embodiment of the present invention.

Best Mode for Carrying Out the Invention Hereinafter, preferable embodiments of the present invention will be described in detail with reference to the attached drawings, but the present invention is not limited or defined by the embodiments.

FIG. 1 is a perspective view illustrating an eyelet base of an eyelet for RFID, according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of A-A' of FIG. 1; FIG. 3 is a perspective view illustrating the eyelet base and a cap according to an embodiment of the present invention; FIG. 4 is a cross-sectional view illustrating the cap installed on a ring portion of the eyelet base according to an embodiment of the present invention; FIG. 5 is a front view illustrating the eyelet for RFID, according to an embodiment of the present invention, installed on an object by press block; FIG. 6 is a front view illustrating the eyelet for RFID, according to an embodiment of the present invention, installed on the object; FIG. 7 is a cross-sectional view of B-B' of FIG. 6; FIG. 8 is a cross-sectional view illustrating an RFID circuit module disposed in the eyelet for RFID, according to an embodiment of the present invention; and FIG. 9 is a top view illustrating the eyelet for RFID, according to an embodiment of the present invention, installed at the object.

A preferable embodiment of the present invention is formed of an eyelet base composed of conductive material and including a ring portion 110 closely attached to an object 150 and having a slit 115, a fastening portion 120 formed in a single body with the ring portion 110 and passing through the object 150 to be anchored to the object 150 and an RFID circuit module 125 electrically connected to parts defined by the slit 115 and using the eyelet base 100 as an antenna. As illustrated in FIGS. 2 through 4, the ring portion 110 includes a protrusion

117 upwardly protruded around the inner edge and is formed as a flat, circular tile from the inner edge to the outer edge thereof. Also, the ring portion 110 includes a cap 130 preventing a deformation of the ring portion 110 by surrounding the ring portion 110 while the fastening portion 120 is processed to be anchored to the object 150. The cap 130 is transparent so that the slit 115 of the ring portion is shown.

Specifically, the RFID circuit module 125 installed at the bottom of the eyelet base 100 is externally visible so that it is recognized that an eyelet is used as an RFID tag. An end of the cap 130, which is folded toward the bottom of the ring portion 110, is wound and fastened to the bottom of the ring portion 110. The thickness of the cap is approximately 0.5 mm to form the wound end having a diameter of approximately 1 mm, and the length of the folded end may be 3 to 4 cm.

After the cap is placed on the ring portion 110 of the eyelet base 100, the RFID circuit module 125 is disposed at the bottom of the ring portion 110 to be coupled with the slit 115 by die bonding. The fastening portion 120 is extended downward from the inner edge of the ring portion 110 to be formed of a plurality of legs 120a, 120b, and 120c disposed at a predetermined interval, which is formed in the shape of a tripod in which the legs 120a, 120b, and 120c are disposed at the predetermined interval at the bottom of the ring portion 110.

If the fastening portion 120 is formed in the shape of a tripod as described above, it is simple for the RFID circuit module 125 to be disposed between any two of the legs 120a, 120b, and 120c of the tripod and die bonded to the slit 115 formed in the ring portion 110.

In this case, since the RFID circuit module 125 has a very small and sensitive circuit configuration, die bonding has to be performed by using minute tweezers.

However, this described manual labor is not suitable for mass producing eyelets for RFID circuit module 125 and an automated operation has to be possible in order to mass produce the eyelets.

Namely, the RFID circuit module 125 should be fastened to a picker performing an automated operation of transferring and disposing the RFID circuit module 125 on the slit 115 of the ring portion 110. In this case, the RFID circuit module 125 may be disposed in the slit and die bonded to both ends of the slit 115.

As described above, in the case the fastening portion is formed in the shape of a tripod in which the plurality of the legs 120a, 120b, and 120c are disposed, between the legs 120a, 120b, and 120c, the access of the picker and die bonder with respect to the slit 115 of the RFID circuit module 125 becomes easy, thereby improving operation efficiency.

As illustrated in FIG. 5 in the case the fastening portion 120 of an eyelet 10 formed of the eyelet base 100 including the RFID circuit module 125 passes through the object 150 to fasten the eyelet base 100 itself to the object 150, the plurality of the legs 120a, 120b, and 120c forming the fastening portion 120 pass through the object 150, the lower end of the legs 120a, 120b, and 120c are constricted by a fastening block 160 having a concave groove 142, the legs 120a, 120b, and 120c are wound toward the object 1150 along the groove 142 to form a wound portion 170, thereby fastening the eyelet base 100 to the object 150.

The press block 140 pressurizing the fastening portion 120 of the eyelet base 100 is paired with a fastening block 160 fastening the ring portion 110 of the eyelet base 100 to fasten the eyelet base 100 to the object 150.

In the case frequency bandwidth of the RFID circuit module is more than approximately 2 GHz, the function of an antenna may be sufficiently performed by the size of a conventional eyelet. However, in the case the frequency bandwidth is approximately 900 MHz₃ the function of an antenna may not be sufficiently performed by the size of a conventional antenna. For example, in frequency bandwidth of approximately 900 MHz, a dipole antenna of the RFID circuit module 125 has to be at least approximately 15 to 16 cm to efficiently perform communication between the RFID circuit module 125 and a reader. However, if an eyelet connected to the RFID circuit module 125 as an antenna is manufactured in approximately 15 cm, the original functionality of an eyelet may be reduced.

To solve this problem, in the eyelet for RFID, according to an embodiment of the present invention, an antenna extension portion 190 is electrically connected to the eyelet base 100, thereby extending the length of the antenna of an RFID circuit module 125 as shown in FIG. 9. The antenna extension portion 190 may be composed of aluminum tape, a paint having conductivity, or a conductive sheet, which is attachable to the object 150. The antenna extension portion 190 is applied to the object 150, thereby extending the length of the antenna. Also, since the process of forming the antenna extension portion 190 as described above is simple and inexpensive, common use is easily achievable. Also, the antenna extension portion 190 may be printed by hot stamping. By using hot stamping, it is possible to show not only simple shapes made by tape but also trademarks or firm names.

On the other hand, the eyelet base 110 is generally composed of metal material having a high malleability and ductility, such as aluminum, brass, and iron. Since the material also has high degree of backscattering, the material has a superior property of an antenna of UHF.

In the case the eyelet 10 for RFID as described above closely passes by a reader-writer, a signal for requesting data is received from the reader-writer and the RFID circuit module 125 may generate the signal or update stored data in response to the signal received from the antenna extension portion 190 and the eyelet base 100. In this case, the RFID circuit module 125 is physically protected by the eyelet base 100 composed of metal. In this case, the object 150 may be a tag bonded to freight for indicating the place of arrival or starting place and may be used in all types of mails, parcels, physical distribution wraps, tags for clothes, and tents for freight vehicles, and wraps for products sold in large retail stores. Hereinafter, a method of manufacturing an eyelet for RFID, according to an embodiment of the present invention will be described.

FIGS. 10 through 17 are perspective views, front views, top views, and cross- sectional views illustrating a process of manufacturing an eyelet for RFID according to a method of manufacturing the eyelet for RFID, according to an embodiment of the present invention.

As illustrated, the method of manufacturing an eyelet 235 for RFID includes the step of forming an eyelet tile 200 in which a ring portion 210 is formed in the shape of a flat, circular tile by processing predetermined conductive material and a fastening portion 220 is extended downward from the inner edge of the ring portion 210 and formed of a plurality of legs 220a, 220b, and 220c.

In the step of forming the eyelet tile 200, a predetermined metal panel is cut to form the ring portion 210 formed in the shape of a tile and a plurality of tiles formed in the shape of legs (220a, 220b, and 220c) forming the fastening portion 220 are disposed at a predetermined interval. After the step of forming the eyelet tile 200, the step of forming a protrusion

217 around the inner edge of the ring portion 210 and the step of forming an eyelet base 205 in which the legs 220a, 220b, and 220c of the fastening portion are pressurized to be folded downward from the ring portion 210 are performed.

In this case, the step of forming the protrusion 217 and the step of forming the eyelet base 205 may be performed at the same time by a pressuring press 226 and a fastening press 228.

That is, in the case the legs 220a, 220b, and 220c formed on the ring portion 210 are pressurized, the pressuring press 226 passing through the center portion of the ring portion 210 is used and the fastening press 228 opposite to the pressuring press 226 is disposed below the ring portion 210.

In this case, the fastening press 228 includes a ring-shaped portion 222 pressurizing the bottom of the ring portion 210 to form the protrusion 217 and a path 228a through which the pressuring press 226 and the plurality of the legs 220a, 220b, and 220c pressurized by the pressuring press 226 to be folded downward pass through. The fastening press 228 includes a ring-shaped groove that is paired with the ring- shaped portion 222 of the pressing press 228 and pressurizes the ring portion 210. After the step of forming the eyelet base 205, the step of forming a slit 215 by cutting the ring portion 210 is performed. After the step of forming the slit 215, a cap 230 is placed on the outside of the protrusion 217 of the ring portion 210 to surround the outside and the outside end of the cap 230 is curled downward the ring portion 210 to fasten the cap 230. After the step of installing the cap 230, the RFID circuit module 225 is disposed below the ring portion 210 and installed at both terminals of the slit 215 by die bonding. After the step of die bonding, the fastening portion 220 of the eyelet base 205 equipped with the RFID circuit module 225 is passed through an object 250 and the fastening portion 220 is curled such that the ring portion 210 is closely attached to the object 250, thereby installing the eyelet 235.

In the step of installing the eyelet 235, the plurality of the legs 220a, 220b, and 220c forming the fastening portion 220 passes through the object 250, the lower end of the legs 220a, 220b, and 220c are pressurized by a fastening block 260 having concave grooves 242, and the legs 220a, 220b, and 220c are wound toward the object 250 along the groove 242 to form a wound portion 270, thereby fastening the eyelet base 205 to the object 250.

In this case, the fastening block 260 pressurizing the fastening portion 220 of the eyelet base 205 is paired with a press block 240 fastening the ring portion 210 of the eyelet base 205 to fasten the eyelet base 205 to the object 250.

Industrial Applicability

As described above, an eyelet for RFID and a method of manufacturing the eyelet for RFID, according to the present invention, have many merits in which a manufacturing process may be notably simplified by using the eyelet itself as an antenna, in comparison with a manufacturing process of a conventional RFID tag, an RFID circuit module may be effectively fastened to an object, and the function of a conventional eyelet generally used may be maintained and improved. Also, since a conventional eyelet engagement unit may be used as it is, it is very economical, mass production is possible to be useful for decreasing the cost. Since there are various types of eyelets, eyelets are widely used in various fields of life. Since the manufacturing and installing process are also simple and manufacturing facilities are also widely distributed, the cost of RFID tags may be notably reduced.

An eyelet base composed of metal material may effectively protect an RPID circuit module from external environments and may be used as an antenna to notably reduce the cost of manufacturing the antenna, thereby reducing the maintenance and management costs of the RFID tag. Also, since the eyelet base is closely attached to an object to protect the RFID circuit module, adhesive strength may be well maintained.

By using the merit of backscattering of an eyelet composed of metal material in a frequency higher than the UHF band, a unit coupled with the eyelet base or an aluminum tape is additionally used. Accordingly, a manufacturing process of a conventional RFID tag may be notably simplified, the cost of manufacturing may be reduced, and mass production may be possible.

Also, since the eyelet for RFID and the method of manufacturing the eyelet largely includes the eyelet composed of metal and an RFID circuit module, but a conventional RFID tag includes a film composed of plastic coated by a thin metal film and a spiral-shaped leading wire and an RFID circuit module, the eyelet for RFID and the method of manufacturing the eyelet of the present invention have a great merit in the aspect of reuse.

Also, as eyelets in various shapes and various designs are currently used, the eyelet for RFID and the method of manufacturing the eyelet may also show various shapes and colors and have a great value as an ornament. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

Claims

1. An eyelet for radio frequency identification (RFID), comprising: an eyelet base including a ring portion closely attached to an object and a fastening portion formed in a signal body with the ring portion and penetrating the object to be anchored to the object, the eyelet base composed of conductive material, the eyelet base having a slit; and an RFID circuit module electrically connected to each part divided by the slit to form a circuit using the eyelet base as an antenna.

2. The eyelet of claim 1, wherein the ring portion comprises a protrusion upwardly protruded around the inner edge.

3. The eyelet of claim 1, wherein the ring portion is formed as a flat, circular tile from the inner edge to the outer edge thereof.

4. The eyelet of claim 1, wherein the ring portion further comprises a cap for preventing the deformation of the ring portion by surrounding the ring portion while the fastening portion is processed to be anchored to the object.

5. The eyelet of claim 4, wherein the cap is transparent so that the slit of the ring portion is shown.

6. The eyelet of claim 1, wherein the fastening portion is extended downward from the inner edge of the ring portion to be formed of a plurality of legs disposed at a predetermined interval.

7. The eyelet of claim 1, wherein the lower end of the fastening portion is constricted and wound by a fastening block having a concave groove to fasten the eyelet base to the object.

8. The eyelet of claim 1, further comprising an antenna extension portion electrically connected to the eyelet base and used as an antenna of the RFID circuit module, together with the eyelet base.

9. A method of manufacturing an eyelet for RFID, comprising the steps of: providing an eyelet base including a ring portion having a slit and a fastening portion formed at the inner edge of the ring portion and extended downward, the eyelet base composed of conductive material; disposing a cap on the ring portion to surround the ring portion; installing the cap to the ring portion by curling the bottom end of the cap until the curled bottom end reaches the bottom of the ring portion; die bonding RFID circuit module on the bottom of the ring portion with electrically connecting conductive pins of the RFID circuit module to both ends of the slit; and installing the eyelet to the object by anchoring the fastening portion of the eyelet base to the object.

10. The method of claim 9, wherein the step of providing the eyelet base comprises the steps of: forming the ring portion and the fastening portion including a plurality of legs extended inward from the inner edge of the ring portion, the ring portion and the fastening portion made of a conductive material in the shape of a flat, circular tile; folding the legs of the fastening portion downward by a pressing process; and cutting through a portion of the ring portion to form the slit.

11. The method of claim 9, wherein, in the step of installing the eyelet to the object, the fastening portion is wound to be close attached to the object.

12. The method of claim 9, wherein, in the step of installing the eyelet to the object, the fastening portion is bent to be closely attached to the object.

13. The method according to any one of claims 9 and 10, wherein the step of providing the eyelet base further comprises forming a protrusion formed around the inner edge of the ring portion.