TWI641996B - Fabric long-distance identification electronic label - Google Patents

Abstract

A fabric long-distance identification electronic tag, which is a radio frequency identification RFID chip on a rectangular loop circuit, receives and feedbacks electromagnetic wave signals formed by a metal film antenna and an electronic tag reader end, and matches the anti-welding hole by a long-mouth shaped hole slot The slot adjusts the frequency/bandwidth, sensitivity and field effect of the electromagnetic wave signal, so that the electronic tag reader can read the ID of the UHF electronic tag with high sensitivity and long read distance to achieve the fabric. Identification of long distance and low error rate; even if the fabric is cleaned and wrung out, whether the fabric is in a dry or wet state, the flexible upper and lower gaskets are applied to the flexible insulating substrate sheet and the metal film antenna package. The resulting anti-extrusion and anti-twist protection, the RFID chip is coated with an insulating thermosetting adhesive layer, and the solder joint breakage prevention formed by the fixing of the RFID chip on the solder joint is strengthened, and the electron is also prevented. The label reader can maintain good long-distance recognition for the long-term cleaning of the fabric, and enhance the durability and convenience of identification and distribution before and after fabric cleaning.

Description

 Fabric long-distance identification electronic label  

The invention relates to an electronic label which is stitched on a fabric woven fabric and allows sewing stitches to be sewn, and has a long-distance reading recognition effect, in particular, can be firmly and reliably stitched on a frequently cleaned fabric woven fabric, and can be stably maintained for a long time. A long-distance identification electronic tag that effectively maintains a good long-distance reading recognition effect.

Radio Frequency Identification (RFID) technology has been widely used in many fields such as industrial automation, commercial automation, and transportation control management. More and more research is beginning to study ultra-high frequency (UHF) RFID systems to achieve long-distance, high-efficiency, and low-cost features of the system. Because RFID has the advantages of non-contact, low cost, high anti-counterfeiting and mass production, and has low cost, it has gradually replaced the traditional two-dimensional bar code. At present, radio frequency identification (RFID) is also widely used in many fields such as identity recognition, access control, vehicle (flow) management, warehousing logistics, retail, industrial security management and forest management.

Generally, a radio frequency identification electronic tag usually has an antenna antenna on an insulating substrate and a radio frequency identification chip is electrically connected to the line antenna. Since electronic tags have an electronic structure, they must be properly protected to avoid damage and loss of performance during use. Especially when the electronic label is used in the industrial fabric cleaning industry (such as the laundry industry), the special protection mechanism is particularly important. This is because the process of twisting, twisting, twisting, drying, etc. of the fabric cleaning is often easy to stitch on the fabric. The electronic tag on the woven fabric breaks and breaks and loses its function.

The electronic label used on fabrics, such as the No. I453677 "Radio Frequency Identification Label and Clothing with It" Taiwan invention patent case, although the inside of the inlay (130) is provided with a cladding (103) to the substrate (131) The circuit antenna (150) and the line antenna (150) package wafer (140) on the substrate (131) form a protective effect. However, the line antenna (150) is designed in the form of a microstrip, which is not easy to be used with the fabric woven material. To achieve the ideal match, the antenna of the UHF electronic tag will affect the reading distance and stability of the electronic tag reader due to the small cross-sectional area of the radio signal. For the need to distribute the fabric (clothing) after cleaning, it cannot be long distance. The stable identification of the fabric will inevitably reduce the convenience and efficiency of the distribution work, especially the wire antenna (150) in the form of a zigzag microstrip must avoid sewing stitches, and if the stitches pass through the antenna microstrip, the breakage is caused. In the case, the unpredictable change of the signal type due to the electric wave signal, the sensitivity of the electromagnetic wave induction, and the problem of the reading failure may occur, so that the above-mentioned conventional electronic tag is not suitable for the weaving method. Fixed, impact on electronic label bound using fabric robustness or reliability.

The main object of the present invention is to provide a fabric long-distance identification electronic tag, which is an ultra-high frequency electronic tag, comprising an insulating substrate sheet, a radio frequency identification RFID chip, an upper spacer and a lower spacer; the insulating base a thin strip of sheet material formed of a flexible insulating material having an upper surface and a lower surface, wherein the upper surface is provided with a metal film antenna having a pair of antenna long sides, the pair of antennas A long-mouth shaped hole is formed on the antenna surface between the long sides, and the long-shaped hole-breaking groove is formed with a welding-proof hole groove to the long side of the antenna, and both sides of the welding-proof hole have a welding point as a welding Forming a rectangular loop circuit on the pad; the two poles of the RFID chip are soldered to the solder joint (pad Pad) of the metal film antenna to form an electrical connection with the rectangular loop circuit, and the outer cover is externally coated An insulating thermosetting adhesive layer is fixed on the rectangular ring circuit and the upper surface of the insulating substrate sheet; the upper spacer is a flexible flexible insulating strip having a shape opposite to the insulating substrate sheet shape a spacer body is disposed on the upper surface of the insulating substrate sheet, and the metal film antenna and the RFID chip are wrapped in the interlayer between the upper spacer and the upper surface of the insulating substrate sheet and the outside The lower gasket is a flexible flexible insulating strip-shaped gasket body shaped like a sheet of the insulating substrate, and is disposed on the lower surface of the insulating substrate sheet; when the ultra-high frequency electronic label is reliable and firm When stitched on the fabric woven fabric and recognized by the electronic tag reader, the normal sewing stitch is sewn through the ultra-high frequency electronic according to the rectangular loop portion of the metal film antenna and the radio frequency identification RFID chip are not sewn. a tag, the RFID chip on the rectangular loop circuit receives and feedbacks electromagnetic wave signals formed by the metal film antenna and the electronic tag reader end, and matches the frequency band of the electromagnetic wave signal by the long mouth shaped hole slot / Bandwidth, sensitivity and field effect are adjusted to enable the electronic tag reader to read the ID of the UHF electronic tag with high sensitivity and long read distance to achieve long distance and low fabric. Identification of the rate of error; even if the fabric is cleaned and wrung out, regardless of whether the fabric is in a dry or wet state, the anti-squeezing of the flexible upper and lower gaskets on the flexible insulating substrate sheet and the metal film antenna package Pressure and anti-twist protection, insulating the RFID chip with the insulating thermosetting adhesive layer, strengthening the solder joint break prevention formed by the fixing of the RFID chip on the solder joint, and also making the electronic tag reader For the cleaned fabric, it can maintain good long-distance recognition for a long time, and enhance the durability and convenience of identification and distribution before and after fabric cleaning.

A second object of the present invention is to provide a fabric long-distance identification electronic label, wherein the insulating substrate sheet is made of a polyimide or a polyethylene terephthalate (PET). a flexible sheet of material, the antenna film surface formed by etching a metal film coated on the upper surface of the insulating substrate sheet, and a long-mouth shaped hole on the metal film antenna, and solderproof The hole groove and the solder joint can be fabricated by the line process of a general soft PC circuit board.

A further object of the present invention is to provide a fabric long-distance identification electronic tag, wherein the upper pad and the lower pad are flexible flexible insulating spacer bodies formed of a silicone material, by the upper and lower spacers It has the ability to resist acid and alkali, high temperature and non-bacteria, so that the UHF electronic label can be sewn on the fabric weaving. In addition to the external force of pressing and twisting, the cleaning process can be carried out in addition to the cleaning process. After cleaning, it has the effect of resisting detergent, drying temperature and bacteria.

Another object of the present invention is to provide a fabric long-distance identification electronic tag, wherein the upper outer surface of the upper spacer is a long-mouth shaped hole slot relative to the metal film antenna, and is composed of lines, totems, characters or colors. A limited seam area is marked, which can be avoided when the UHF electronic label is sewn on the fabric, and the rectangular loop of the metal film antenna can be prevented from being broken or broken by the needle or the suture.

Another object of the present invention is to provide a fabric long-distance identification electronic label, wherein the bottom surface of the lower spacer is coated with a double-sided adhesive layer, and a release paper is attached to the double-sided adhesive layer. When the UHF electronic label is to be sewn on the fabric woven fabric, only the release paper needs to be torn off, that is, the double-sided adhesive layer can be adhered to the woven fabric to form a temporary fixing effect, which is convenient for the sewing work.

A second object of the present invention is to provide a fabric long-distance identification electronic tag, wherein the outer surface of the upper spacer is coated with a flexible insulating reinforced surface layer, and the reinforced surface layer is shattered by the shimming Or the force of twisting, so that the rectangular loop circuit of the metal film antenna increases the anti-pull effect.

A second object of the present invention is to provide a fabric long-distance identification electronic tag, wherein a metal film antenna of the insulating substrate sheet and the upper pad are lined with a flexible insulating interlayer, which is insulated by The laminated metal film antenna forms a tensile strengthening effect on the rectangular loop circuit, so that the UHF electronic label is sewn on the fabric woven fabric to increase the anti-twist effect; and the surface of the insulating interlayer is opposite to the radio frequency The RFID chip is identified, and a filler hole is defined, and a filler space is formed on the periphery of the RFID chip by the filler hole frame, so that the thermosetting adhesive material is filled and filled in the filler space to facilitate the insulating thermosetting adhesive. The layers are coated and formed on the outer surface of the RFID chip.

10, 10A‧‧‧UHF electronic tags

20‧‧‧Insulation substrate sheet

21‧‧‧ upper surface

22‧‧‧ Lower surface

30‧‧‧radio frequency identification RFID chip

40‧‧‧Upper gasket

41‧‧‧Fracture area

42‧‧‧ Strengthening the surface

50‧‧‧ Lower gasket

51‧‧‧ double-sided adhesive layer

52‧‧‧ release paper

60‧‧‧Metal film antenna

61A, 61B‧‧‧ long side of the antenna

62‧‧‧Long mouth shaped hole slot

63‧‧‧solderproof slot

64A, 64B‧‧‧ solder joints

65‧‧‧Rectangular loop

66, 66A‧‧‧Insulated thermosetting adhesive layer

70‧‧‧ fabric

71‧‧‧ stitching

80‧‧‧Insulating interlayer

81‧‧‧Filling holes

82‧‧‧fill space

Figure 1 is an exploded perspective view of the structure of the present invention

Figure 2 is an enlarged schematic view of the structure of Figure 1A

3 is a schematic structural view of an insulating thermosetting adhesive coated wafer of the present invention;

Figure 4 is an enlarged schematic view of the structure of Figure 3B

Figure 5 is an external view of the front structure of the present invention

Figure 6 is a sectional view of Figure 5A-A

Figure 7 is an enlarged schematic view of the structure of Figure 6C

Figure 8 is a cross-sectional structural view of the present invention stitched on a fabric

Figure 9 is an enlarged schematic view of the structure of Figure 8D

Figure 10 is a cross-sectional structural view of a double-sided adhesive layer and a release paper according to the present invention.

Figure 11 is an enlarged schematic view of the structure of Figure 10E

Figure 12 is a schematic view showing the state of tearing off the release paper of the present invention.

Figure 13 is an enlarged schematic view of the structure of Figure 12F

Figure 14 is an exploded view of another embodiment of the present invention

Figure 15 is a cross-sectional structural view showing another embodiment of the present invention

Figure 16 is an enlarged schematic view of the structure of Figure 15G

Figure 17 is an exploded view of another embodiment of the present invention

Figure 18 is a perspective view showing the structure of an insulating interlayer laminated on an insulating substrate sheet according to still another embodiment of the present invention.

Figure 19 is an enlarged schematic view of the structure of Figure 18H

Figure 20 is a front view showing the structure of another embodiment of the present invention.

Figure 21 is a cross-sectional structural view of Figure 20B-B

Figure 22 is an enlarged schematic view of the structure of Figure 21I

The present invention is directed to the above objects, and the preferred embodiments are described in detail with reference to the accompanying drawings. The following is a detailed description of a fabric long-distance identification electronic tag, as shown in Figures 1, 2, 3, and 4, which is an ultra-high frequency electronic device. The label 10 includes an insulating substrate sheet 20, a radio frequency identification (RFID) chip 30, an upper spacer 40 and a lower spacer 50. The insulating substrate sheet 20 is a strip of flexible insulating material. And having an upper surface 21 and a lower surface 22, wherein the upper surface 21 is provided with a copper or aluminum metal film antenna 60 having a pair of antenna long sides 61A, 61B, the pair of antenna long sides 61A, 61B A long-mouthed hole-breaking groove 62 is formed on the antenna surface, and the long-hole shaped hole groove 62 to the long side 61A of the antenna is formed with a solder-proof hole 63, and both sides of the solder-proof hole 63 have a soldering Points 64A, 64B form a rectangular loop 65 as a pad; the two poles of the RFID chip 30 are soldered to solder joints 64A, 64B (pad Pad) of the metal film antenna 60 and The rectangular loop circuit 65 is electrically connected and is externally covered with an epoxy resin insulation. a thermosetting adhesive layer 66 for firmly fixing the wafer body to the rectangular ring circuit 65 and the upper surface 21 of the insulating substrate sheet 20; as shown in FIGS. 1, 5, 6, and 7, the upper spacer 40 is a relative The flexible flexible insulating strip-shaped spacer body in the shape of the insulating base sheet 20 is attached to the upper surface 21 of the insulating base sheet 20, and the metal film antenna 60 and the radio frequency identification RFID chip 30 are packaged. The upper spacer 50 is separated from the outside by an interlayer between the upper spacer 40 and the upper surface 21 of the insulating base sheet 20; the lower spacer 50 is a flexible flexible insulating long pad having a shape opposite to the insulating substrate sheet 20. The sheet is attached to the lower surface 22 of the insulating substrate sheet 20; as shown in Figures 8 and 9, when the UHF electronic label 10 is securely and securely sewn to the fabric 70 fabric (e.g., in a woven interlayer), When the electronic tag reader (not shown) is used for identification, the normal sewing stitch 71 is sewn too high depending on the rectangular loop circuit 65 of the metal film antenna 60 and the radio frequency identification RFID chip 30 are not sewn. Frequency electronic tag 10, as shown in Figures 3, 4, 5, the radio frequency identification RFID chip 30 on the rectangular loop circuit 65, through the gold The electromagnetic wave signal receiving and feedback formed by the film antenna 60 and the end of the electronic tag reader (not shown) is matched with the frequency/bandwidth of the electromagnetic wave signal by the long-hole shaped hole groove 62. The field effect is adjusted. As shown in Figures 8 and 9, the electronic tag reader (not shown) can read the ID of the UHF electronic tag 10 with high sensitivity and long read distance to achieve the length of the fabric. Identification of distance and low error rate; even if the fabric 70 is cleaned and wrung, regardless of whether the fabric 70 is in a dry or wet state, the flexible upper and lower pads 40, 50 are pair of the flexible insulating substrate sheet 20 and The anti-extrusion and anti-twist protection generated by the packaging of the metal film antenna 60, the RFID chip 30 is covered with the insulating thermosetting adhesive layer 66, and the fixing of the RFID chip 30 on the solder joints 64A, 64B is strengthened. The prevention of breakage of the solder joint formed by the property also enables the electronic label reader (not shown) to maintain a good long-distance recognition for the cleaned fabric 70 for a long period of time, and to improve the durability and convenience of the identification and distribution of the fabric 70 before and after cleaning; That is, most countries or The area will regulate the frequency band of the electronic tag (RFID TAG). For example, the frequency band used in Taiwan is between 920 and 930 MHz. It is sewn into the fabric woven fabric through the above-mentioned UHF electronic tag 10, such as the attachment test report. The reading test was carried out in the dry state of the fabric and the wet state under the condition of two hundred times of water absorbing and wringing, and the above-mentioned detection was confirmed by the Finnish Voyntic Tagformance Lite Measurement System (UHF RFID) test instrument in the frequency range of 860 MHz to 960 MHz. The high-frequency electronic tag 10 is sewn into the fabric woven fabric, and after a plurality of water-absorbing and wringing operations, whether the fabric is dry or wet, the effective reading distance is at least 4.5 meters, and it is obvious that the above-mentioned UHF electronic tag 10 is used on the fabric. It can be sewn and stitched, and it has the practicality of long-term reading distance in the dry or wet state after the fabric is cleaned and twisted.

According to the above embodiment, wherein the insulating substrate sheet 20 is made of a polyimide or a polyethylene terephthalate (PET) material, as shown in FIGS. The metal film antenna 60 is an antenna surface formed by etching a copper or aluminum metal film coated on the upper surface 21 of the insulating substrate sheet 20, and the long-hole shaped hole 62 on the metal film antenna 60 is formed. The solder mask hole 63 and the solder joints 64A and 64B can be fabricated by a line process of a general soft PC circuit board.

According to the above embodiment, wherein the upper gasket 40 and the lower gasket 50 are flexible flexible insulating gasket bodies formed of a silicone material, as shown in FIGS. 1, 6, and 7, by the upper and lower gaskets 40, 50 has the ability to resist acid and alkali, high temperature and is not easy to germs. As shown in Figures 8 and 9, the UHF electronic label 10 is sewn on the fabric 70 fabric. When the fabric 70 is cleaned, it can withstand extrusion and twisting. In addition to the external force, it can also get the anti-cleaning agent, the drying temperature and the bacteria-inducing effect after the cleaning process and cleaning.

According to the above embodiment, wherein the upper outer surface of the upper spacer 40 is opposite to the long-hole shaped hole 62 of the metal film antenna 60, as indicated by lines, totems, characters or colors. The slit-limiting area 41, as shown in Figs. 8 and 9, can be sewn away from the seam-limiting area 41 when the UHF electronic label 10 is sewn on the fabric 70, and the rectangular loop circuit 65 of the metal film antenna 60 can be ensured. 3, 4) Not broken or broken by the needle or suture 71.

According to the above embodiment, wherein the outer surface of the lower spacer 50 is coated with a double-sided adhesive layer 51, and a release paper 52 is attached to the double-sided adhesive layer 51, as shown in FIGS. When the ultra-high frequency electronic tag 10 is sewn on the fabric 70 woven fabric, as shown in FIGS. 12 and 13, only the release paper 52 has to be torn off, that is, the double-sided adhesive layer 51 can be adhered to the woven fabric to form a temporary fixing effect, which is convenient. The stitching work is carried out.

According to the above embodiment, wherein the outer surface of the upper spacer 40 is coated with a flexible insulating and reinforced surface layer 42 as shown in FIGS. 14, 15, and 16, by the reinforcing surface layer 42, the upper spacer 40 is squeezed or The force applied during the twisting causes the rectangular loop circuit 65 of the metal film antenna 60 to increase the pulling resistance.

According to the above embodiment, as shown in FIGS. 17, 18, 19, the metal film antenna 60 of the insulating substrate sheet 20 and the upper spacer 40 are lined with a flexible insulating interlayer 80, through an insulating interlayer. The rectangular ring circuit 65 of the 80 metal film antenna 60 forms a tensile strengthening effect, and the UHF electronic tag 10A is sewn on the fabric woven fabric (not shown) to increase the anti-twist effect; as shown in Figs. 19, 20, 21, 22, and a surface of the insulating interlayer 80, a filling hole 81 is defined in the RFID chip 30, and the filling hole 81 is framed on the RFID chip 30. A filler space 82 is formed on the periphery thereof to enable the epoxy thermosetting adhesive material to be filled and filled in the filler space 82, so that the insulating thermosetting adhesive layer 66A is coated and formed on the outer surface of the RFID chip 30.

The above description is intended to be illustrative, and not restrictive, and many modifications and changes may be made without departing from the spirit and scope of the invention. Equivalent, but all fall within the scope of protection of the present invention.

Claims (8)

 A fabric long-distance identification electronic label, which is an ultra-high frequency electronic label, comprising an insulating substrate sheet, a radio frequency identification RFID chip, an upper gasket and a lower gasket; the insulating substrate sheet is a flexible The elongated strip-shaped sheet formed by the insulating material has an upper surface and a lower surface, and the upper surface is provided with a metal film antenna having a pair of antenna long sides, and an antenna surface between the long sides of the pair of antennas Forming a long-mouth shaped hole-groove groove, the long-mouth shaped hole-groove groove is formed with a solder-proof hole groove on the long side of the antenna, and both sides of the solder-proof hole groove each have a soldering point as a pad to form a rectangle a loop circuit; the two poles of the RFID chip are soldered to the solder joint (pad Pad) of the metal film antenna to form an electrical connection with the rectangular loop circuit, and the outer surface is covered with an insulating thermosetting adhesive layer, The wafer body is tightly fixed on the rectangular ring circuit and the upper surface of the insulating substrate sheet; the upper spacer is a flexible flexible insulating strip-shaped spacer body shaped relative to the shape of the insulating substrate sheet, and is disposed on Insulating substrate On the upper surface of the sheet, the metal film antenna and the RFID chip are covered in an interlayer between the upper gasket and the upper surface of the insulating substrate sheet, and are separated from the outside; the lower gasket is a relative a flexible flexible insulating strip-shaped gasket body in the shape of an insulating substrate sheet is provided on the lower surface of the insulating substrate sheet; when the ultra-high frequency electronic label is reliably and firmly stitched on the fabric woven fabric, and the electronic label is used When the reader recognizes, the normal sewing stitch is sewn through the UHF electronic tag according to the rectangular loop portion of the metal film antenna and the radio frequency identification RFID chip is not sewn, and the radio frequency identification RFID on the rectangular loop circuit The chip receives and feedbacks the electromagnetic wave signal formed by the metal film antenna and the electronic tag reader end, and matches the anti-welding hole groove to the frequency band/bandwidth of the electromagnetic wave signal by the long mouth shaped slot, sensitivity and field effect Adjustment, so that the electronic tag reader can read the ID code of the UHF electronic tag with high sensitivity and long reading distance, and realize the recognition of the long distance and low error rate of the fabric; even if the fabric is Cleaning and squeezing action, whether the fabric is in a dry state or in a wet state, the anti-extrusion and anti-twist protection of the flexible upper and lower gaskets on the flexible insulating substrate sheet and the metal film antenna package The insulating thermosetting adhesive layer covers the RFID chip, strengthens the breakage of the solder joint formed by the fixing of the RFID chip on the solder joint, and enables the electronic label reader to maintain the fabric after cleaning for a long time. Good long-distance recognition enhances the durability and convenience of identification and distribution before and after fabric cleaning.    The long-distance identification electronic label of the fabric according to the first aspect of the patent application, wherein the insulating substrate sheet is made of a polyimine (PI) material or a polyethylene terephthalate (PET). a flexible sheet of material, the antenna film surface formed by etching a metal film coated on the upper surface of the insulating substrate sheet, and a long-mouth shaped hole on the metal film antenna, and solderproof The hole groove and the solder joint can be fabricated by the line process of a general soft PC circuit board.    The long-distance identification electronic label of the fabric according to the first aspect of the patent application, wherein the upper gasket and the lower gasket are flexible flexible insulating gasket bodies formed by the silicone material, by the upper and lower gaskets It has the ability to resist acid and alkali, high temperature and non-bacteria, so that the UHF electronic label can be sewn on the fabric weaving. In addition to the external force of pressing and twisting, the cleaning process can be carried out in addition to the cleaning process. After cleaning, it has the effect of resisting detergent, drying temperature and bacteria.    The long-distance identification electronic label of the fabric according to the first aspect of the patent application, wherein the upper outer surface of the upper gasket is a long-mouth shaped perforation groove with respect to the metal film antenna, and is composed of lines, totems, characters or colors. A limited seam area is marked, which can be avoided when the UHF electronic label is sewn on the fabric, and the rectangular loop of the metal film antenna can be prevented from being broken or broken by the needle or the suture.    The long-distance identification electronic label of the fabric according to claim 1, wherein the outer surface of the lower gasket is coated with a double-sided adhesive layer, and a release paper is attached to the double-sided adhesive layer. When the UHF electronic label is to be sewn on the fabric woven fabric, only the release paper needs to be torn off, that is, the double-sided adhesive layer can be adhered to the woven fabric to form a temporary fixing effect, which is convenient for the sewing work.    The long-distance identification electronic label of the fabric according to the first aspect of the patent application, wherein the outer surface of the upper gasket is coated with a flexible insulating reinforced surface layer, and the reinforced gasket is squeezed by the reinforced surface layer or The force applied during twisting increases the resistance of the rectangular loop of the metal film antenna.    The long-distance identification electronic label of the fabric according to claim 1, wherein the metal film antenna of the insulating substrate sheet and the upper gasket are lined with a flexible insulating interlayer, through an insulating interlayer The metal film antenna forms a tensile strengthening effect on the rectangular loop circuit, so that the UHF electronic label is sewn on the fabric woven fabric to increase the anti-twist effect.    The fabric long-distance identification electronic tag according to claim 7, wherein a surface of the insulating interlayer is provided with a filling hole relative to the RFID chip, and the charging hole is framed in the radio frequency The periphery of the RFID chip is formed with a filling space for the thermosetting adhesive material to be filled and filled in the filling space, so that the insulating thermosetting adhesive layer is coated and formed on the outer surface of the RFID chip.