TWI310160B - Radio frequency identification tag - Google Patents

Description

1310160 IX. Description of the Invention: [Technical Field 3 of the Invention] The present invention relates to a radio frequency identification tag, and more particularly to a radio frequency identification tag attachable to metal. 5 [Prior technology]

RFID (Radio Frequency Identification) tags and other non-contact tags can be read and read in the wireless communication of the wireless communication sfl 'lot management of the government products or resume management of production engineering, etc. News. To this end, the period can replace the bar code used in current product information management. Conventionally, for RFID tags, frequencies of 13.56 MHz, 2_45 GHz, etc. are used, but the use of UHF (Ultra High Frequency) bands such as 953 MHz has now been lifted. However, the RFID tag has a property of being able to communicate as long as it adheres to a metal object (a high-conductivity object) such as a Pc (Personal Computer) case, an instrument, or a metal material. 15 There is a proposal for an RFID tag that can be communicated even if it is attached to metal, such as the American company Intermec Technology (USA).

Encapsulated Stick Tag, AWID (USA) Prox Link MT (APT1014), etc. Its RnD label is hard and has a thickness of about 4 mm.

The size is too large as a label attached to a product or the like. Also, there are proposals for the following rFID 20 tags. For example, there is an antenna coil for RFID which is formed by cooling a coil on both surfaces of a magnetic core material made of a metal crucible or the like (for example, Patent Document 1). Further, there is an antenna coil for RFID which is a structure in which a magnetic core member is inserted in a gap between coils on a meandering sheet (for example, Patent Document 2). [Patent Document 1] JP-A-2002-252518 [Patent Document 2] JP-A-2002-1173 8 3, however, conventional RFID tags are thick and hard as described above, and are difficult to stick to curved surfaces. The problem of using it exists. % - 5 In the 'Patent Document 2', the coil system is formed with a magnetic core material and „magnetic'. The member (4) has a three-dimensional structure and is complicated, so there is a problem that the manufacturing cost is high. SUMMARY OF THE INVENTION The present invention has been made in view of the above, and its object is to provide a wireless frequency identification tag which is thin and flexible, can reduce manufacturing cost, and can be adhered to metal. According to the present invention, in order to solve the above problems, a radio frequency identification tag, that is, a radio frequency identification tag which can be adhered to metal as shown in FIG. 1 is provided, which has a film 30 and is formed in a planar shape. The inverted F-shaped day 15 line 10 on the film 30, and the film 30 is used to make the radiating element 11, the short pin=jumper plug 12 and the power supply portion 13 of the inverted F-shaped antenna 10 from metal In this case, the sticker is attached. In this way, the radio frequency identification tag forms a planar inverted F-shaped antenna 10' on the film 30. Therefore, it is thin and flexible, and has a simple structure. 20 Further, the film 30 is used to make the F The size of the font antenna Since the element 11 and the jumper 'the plug-in 12 and the power supply unit 13 are attached in a state in which the metal is protruded, the wireless communication partner can be made even if it is adhered to the metal. [Effect of the Invention] According to the radio frequency identification tag of the present invention, The structure is configured to form a flat inverted F-shaped antenna on the film, so that it is thin and elastic, and can be used by sticking to the curved surface. Moreover, the structure is simple, thereby reducing the manufacturing cost. The enamel film is attached to the radiation element of the inverted F-shaped antenna, the jumper, and the power supply portion are protruded from the metal, so that the wireless communication can be performed even if it is adhered to the metal. The above and other aspects of the present invention The objectives, features, and advantages of the invention will be apparent from the description of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view showing an RFID tag of a first embodiment. Figure 2 shows the first! The equivalent circuit diagram of the inverted F-shaped antenna and the IC chip. Figure 3 is a graph showing the relationship between the position of the jumper of the inverted f-shaped antenna and the capacitance value. Figure 4 is a graph showing the relationship between the position of the jumper of the inverted f-shaped antenna and the resistance value.

Figure 5 is a perspective view of the inverted F-shaped antenna attached to the copper plate. Fig. 6 is a diagram showing the relationship between the position of the jumper of the inverted f-shaped antenna, the capacitance value, the resistance value, and the transmission distance of the electric wave. Fig. 7 is a perspective view showing a state in which the RFID tag of Fig. 1 is attached to the back surface of the liquid crystal of the notebook pc. Fig. 8 is a perspective view showing the state of the first figure! 710 label attached to the fingerprint sensor of the notebook type Pc. Figure 9 is a schematic diagram of the simulation of the Smith chart of the inverted F-shaped antenna. 7 1310160 Figure 10 is a graph showing the measured values of the Smith chart of the inverted F-shaped antenna. Fig. 11 is a perspective view showing an RFID tag attached to a metal casing as a model of characteristic change. Fig. 12 is a graph showing the relationship between the frequency and the capacitance value of the individual RFID tag and the metal case. Fig. 13 is a graph showing the relationship between the frequency and gain of the RFID & early body and the metal casing. Fig. 14 is a graph showing the gain of the ic wafer used for the 10 RFID tag of Fig. 1 when the transmission distance of a 1C wafer with a half-wavelength folded dipole antenna for wireless communication is 2-15 m. Figure 15 is a schematic diagram for explaining the directivity of an RFID tag. Figure 16 is a schematic diagram showing the directivity of the RFID tag of Figure 15. Fig. 17 is a plan view showing the RHD label of the second embodiment. Figure 18 is a schematic diagram of the simulation of the Smith chart of the inverted F-shaped antenna. [Embodiment] Hereinafter, a third embodiment of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a plan view of the RFID tag of the first embodiment. As shown in the figure, the RFID tag is constructed by an inverted F-shaped antenna 1A, an IC chip 2A, and a film 3A. The inverted F-shaped antenna 10 is a foil-like metal and is formed in a planar shape on the surface of the film 30. Further, in Fig. 1, the RFID tag is mounted in a state of a metal casing 40 such as an electronic device. The inverted F sub-antenna 1 is constructed by a radiation element 11, a jumper (matching circuit) 12, a power supply portion 13, and a ground plane 14. The radiating element u is formed in parallel with the same length as one side of the ground plane 14, and one end is connected to the power supply portion 13 8 1310160, and the other end is open. Further, a jumper 12 is provided between both ends of the radiating element u, and is connected to the ground plane 14. A 1C wafer 20 is mounted between the power supply unit 13 and the ground 14, and the 1C wafer 20 is wirelessly communicated with the reader/writer by a radio wave such as a UHF frequency of 953 MHz, interposed by the inverted F-shaped antenna 1A. The 1C chip 20 writes information received by the reader/writer or transmits the read information to the reader/writer. The film 3 formed with the inverted F-shaped antenna 1 is attached to the radiating element 11 of the inverted rib antenna 1 , the jumper 12 , and the power supply portion π by the metal casing 4 ( (away from the metal casing 40 ) Paste in the state of the state). The adhesive film of the film 3 〇 toward the metal shell 1 〇 body 4 可用 can be carried out with a double-sided tape, or by an adhesive. In addition, in the first drawing, the film 12 is formed in a state in which the jumper 12 and the one side of the power supply portion 13 are formed in line with one side of the metal casing 4, and the inverted F-shaped antenna 1 is placed. The radiation element n, the jumper 12, and the power supply portion 13 are formed in a state of being protruded from the metal casing 4''. In this manner, the radiation element u, the 15 jumper 12 and the power supply portion 13 are formed in a state of not overlapping with the metal casing 4, and wireless communication with the reader/writer can be performed. The size of the ground plane 14 of the inverted F sub-antenna 1 is, for example, 80 mm in lateral length and 45 mm in longitudinal length b. The length of the radiating element 丨丨 is the same as the width of the ground plane 14 and is 8 mm. The distance between the radiating element 丨丨 and the ground plane 14 is 20 mm. The width d, e, and f of the radiating element 跨cross connector 12 and the power supply unit 13 are 1 mn. The distance X between the jumper 12 and the power supply unit 13 is determined by the impedance of the 1C wafer 20. That is, the position of the jumper 12 is determined in a state in which the impedance of the IC chip 2 is matched. Further, the size of the film 3 is the same as or larger than the outer frame of the inverted F pre-type antenna 10, so that the inverted F-shaped antenna 1 〇 9 1310160 is formed on the film 30. Further, the size of the inverted-F antenna is only an example of a form, and is not limited thereto. The material of the inverted F-shaped antenna 1 is a metal such as copper, silver or aluminum. The thickness of the inverted F-shaped antenna 1 决定 is determined by considering the electric current loss caused by the skin effect. The skin effect is determined by the frequency of the current flowing through the inverted F-shaped antenna and the conductivity of the material. For example, when the material is copper and the frequency of the electric wave is 913 MHz, it must have a thickness of 2/zm to 3/zm or more. In other words, the 'inverted F-shaped antenna 10' can achieve a thinness such as 5 〇 #m or less. The film 30 is an insulator, and a thin film such as PET (polyethylene terephthalate) can be used. The thickness of the film 30 is not particularly limited. The manufacturing method of the inverted-F antenna 101 is such that the copper foil is cut into the shape shown in Fig. 1 and attached to the film 3 by an adhesive or the like. Alternatively, for example, copper may be printed on the film 3 by means of screen printing or the like in a shape as shown in a magic image to form an inverted F-shaped antenna 10. Alternatively, for example, copper is vapor-deposited on the film, and an inverted F-shape of the shape shown in the figure is formed on the tantalum film 30. Alternatively, for example, the masking is laminated on the metal of the film 30, and then The film is formed into an inverted F-shaped antenna 1A having the shape shown in Fig. 1. Thus, an inverted J7-shaped antenna 1 is formed on the film 30, so that an RFID tag having a simple structure can be realized, and even if the metal is attached to the RFm tag It can also be used as a wireless communicator with the reader/writer 2 device. Moreover, since the film 3 is spit to form a simple structure of the planar inverted F-shaped antenna 10, even a metal f-curved surface can be pasted. Also, on the film 30 The planar inverted antenna 1() is formed to make the manufacturing easy and the manufacturing cost can be reduced. The person can construct a simple explanation for the principle that the light can be communicated even when the lamp is still attached to the gold shell 1310160 body 40. When a metal surface is incident on an electric wave, its electric wave is reflected on the metal surface. At this time, the electric field phase of the reflected electric wave is different from the electric field phase of the incident electric wave by 18 degrees, so that the electric field in the metal becomes 0. For this, RFID tag stuck to gold When the casing 4 is placed on the casing 4, the radio wave cannot be received and transmitted. The RFID tag according to Fig. 1 is mounted in a state where the radiation element 丨丨, the jumper 12 and the power supply portion 13 are protruded from the metal casing 40. For this reason, the portion of the radiating element 11, the jumper 12, and the power supply portion 13 is not present in the metal case 4, so that radio waves are not reflected in the metal case 40, so that wireless communication can be performed. The circuit of the inverted F-shaped antenna 10 and the 1C chip 20 of the RFID tag shown in the figure will be described. Fig. 2 is an equivalent circuit diagram showing the inverted f-shaped antenna and the IC chip of Fig. 1. The F-shaped antenna 1 is viewed from the ic chip 20, and the circuit 15 is a circuit of the resistor R1 and the coil L1. The 1C chip 20 is viewed from the inverted F-shaped antenna 10, and can be regarded as a circuit having a capacitor C1 and a resistor R2. In addition, the node N1 in the figure corresponds to the power supply portion 13 of Fig. 1, and the node N2 corresponds to the ground plane 14. The impedance seen by the inverted F-shaped antenna 1 of the IC chip 20 is based on the jc wafer 20. Determined by the internal circuit of 20 (in Figure 2, capacitor C1 and resistor R2). Here, change the inverted F word. The impedance of the antenna 1〇 is matched to the impedance matching of the redundant chip 2. The impedance of the inverted F sub-antenna 10 (the parallel circuit of the coil L1 and the resistor R1 in FIG. 2) is as illustrated in FIG. The interval X between the jumper 12 and the power supply 11 1310160 portion 13 is changed and changed. Therefore, the position of the jumper 12 of the inverted F-shaped antenna 1 is determined in a state of being matched with the impedance of the IC chip 2. The admittance of the 'inverted F-shaped antenna 1' is shown in the following equation (1) by the circuit diagram of Fig. 2. Again, the admittance of the Ic chip 2 is based on the circuit diagram 5 of Fig. 2 and is as follows (2) ) shown. However, the equations (1) and (7) are imaginary numbers and ω is the angular frequency. Y=(i/Rl) + (i/j^Li) (i) Y 2 (l/R2HjwCl...(2) # by this 'for the inverted F-shaped antenna 10 and the IC chip 20 Impedance matching, 10 must have the relationship of R1=R2, and in order to eliminate the invalid power, the position of the jumper 12 must be determined in the state of wLl relationship. Secondly, the jumper for the inverted F-shaped antenna 10 The position of 12 is explained by the relationship between capacitance and value. • Figure 3 shows the I5 relationship between the position of the jumper and the capacitance value of the F-shaped antenna. The horizontal axis in the figure is the jumper of Figure 1. The position of 12 (interval X), and the vertical axis indicates the capacitance value Ccp of the inverted F-shaped antenna (with a relationship of •). Moreover, the x mark of the line in the figure indicates the inverted F of the size illustrated in Fig. 1. The font antenna 1〇 is located at a simulation result of a radio wave frequency of 95 〇 MHz. For example, when the capacitance value of the 1C chip 20 is 1. 〇 1) 17, the simulation result shown in the figure - 2 〇 shows that the x value is approximately set at 18 mm. When the impedance match is obtained. Further, for example, when the capacitance value of the 1C wafer 20 is 〇.5 PF, it can be seen from the simulation results shown in the figure that the impedance matching can be obtained when the X value is set to approximately 35 mm. Further, the line of the line in the figure indicates that the inverted-F antenna of the size shown in the figure is at a measured frequency of the radio frequency of 950 MHz. It can be seen from Fig. 12 1310160 that the value of the real = is approximately the same as the data of the simulation result. Secondly, it is based on the relationship of the value of the jumper of the inverted F-shaped antenna. Figure 4 shows the relationship between the position of the jumper of the inverted antenna and the resistance value. The horizontal axis of the figure shows the first! The position of the jumper 12 of the figure (interval X), and the axis of the table 7F inverted F-shaped antenna 1G resistance. Further, the line system in the figure shows the simulation result of the inverted-F antenna of the size shown in Fig. 1 at a radio frequency of 950 MHz. For example, if the resistance value of the 1C wafer 20 is 125 kW, and the simulation result in (4) is 10, the impedance matching can be obtained when the X value is set to approximately 2 Gmm. Further, for example, when the resistance value of the 1C cymbal 20 is 175 ,, it can be seen from the simulation results in the figure that the impedance matching can be obtained when the X value is set to approximately 25 mm. Further, as shown in Figs. 3 and 4, the capacitance value and the resistance value of the inverted F-shaped antenna 1 are changed by the position of the jumper connector 12, respectively. Therefore, it is necessary not only to make the values of only one side coincide, but also to consider the values of the simulation results on both sides, and to determine the position of the jumper 12. In addition, when the label is actually attached to the metal, the resistance value can be greatly changed compared with the simulation result. Therefore, it is necessary to adjust the resistance value by sticking the metal of the RFID tag. Next, the relationship between the position of the jumper 12 of the inverted F-type 20 antenna 10 and the capacitance value, the resistance value, and the transmission distance of the radio wave when the RFID tag of Fig. 1 is attached to the plated steel sheet will be described. Fig. 5 is a perspective view showing the inverted F-shaped antenna attached to the copper plate. In the figure, an RFID tag 51 is attached to the copper plate 52. The RFID tag 51 is an RHD tag shown in Fig. 1 and has an inverted F-shaped antenna 1〇 and a film 3〇. Copper plating 13 1310160 The plate 52 has a rectangular shape and has a size of 2 〇 5 mm x 13 mm. Fig. 6 is an explanatory diagram showing the relationship between the position of the jumper of the inverted F-shaped antenna, the capacitance value, the resistance value, and the transmission distance of the radio wave. Table 61 in the figure shows the measured value when the Rfd tag 51 attached to the copper plate 522 of Fig. 5 is wirelessly communicated with a 5 913 MHz radio wave. As shown in Table 61, when the position (interval X) of the jumper 12 is 20 mm, the measured value of the capacitance value Ccp of the inverted F-shaped antenna 1 is 丨28 忡, and the resistance value is 3264 Ω. The transmission distance of the electric wave is 19 〇cm. When the position of the jumper 丨^ is 25mm, the measured value of the capacitance value Ccp of the inverted F-shaped antenna 1〇 is l l〇pF, and the resistance value of 10 is 3242Ω. The transmission distance of the electric wave is 14 〇cm. When the position of the jumper 12 is 30 mm, the measured value of the capacitance value Ccp of the inverted-F antenna 1 is 0.79 pF, and the resistance value is 3772 Ω. The transmission distance of the electric wave is 8 〇cm. Next, the radio wave transmission distance when the RFID tag is attached to the notebook type pC will be described. 15 The brother 7 shows a perspective view showing the state in which the RFID target of the brother 1 is attached to the back surface of the liquid crystal of the notebook pc. In the figure, an RFID tag 51 is attached to the back surface 72 of the liquid crystal book of the notebook PC 71. The RFID tag 51 is an RFID tag shown in Fig. 1 and has an inverted F-shaped antenna 1A and a film 3A. Further, the position of the jumper 12 of the inverted F-shaped antenna 10 is 20 mm. Thus, when the RFID tag 51 is attached to the back surface 72 of the liquid crystal screen of the notebook pc 71 20, the transmission distance of the radio wave is 140 cm. Fig. 8 is a perspective view showing a state in which the RFID tag of Fig. 1 is attached to the fingerprint sensor of the notebook pc. In the figure, an RFID tag 51 is attached to the side of the fingerprint sensor 73 of the notebook PC 71. The RFID tag 51 is an RFID tag shown in the first 14 1310160, and has an inverted F-shaped antenna 10 and a film 30. Further, the position of the jumper 12 of the inverted F-shaped antenna 10 is located at 20 mm. Thus, when the RFID tag 51 is attached to the fingerprint sensor 73 of the notebook PC 71, the transmission distance of the radio wave is 140 cin. Next, the impedance variation of the inverted F-shaped antenna 10 will be described with respect to the frequency. Figure 9 is a simulation diagram showing the Smith chart of the inverted f-shaped antenna. Figure 9(a) shows the change in impedance at 20mm across the connector. The frequency is changed from 800 MHz to 1.1 GHz, and the impedance is changed as indicated by the arrow of the 9th (A). Figure 10 (B) shows the change in impedance at 25 mm across the connector position. When the frequency is changed from 800MHz to 1 · 1 GHz, the impedance changes as indicated by the arrow in Figure 9(B). The Brother 9 (C) diagram shows the change in impedance at the cross-connect position of 3 〇 mm. When the frequency is changed from 800 MHz to 1.1 GHz, the impedance changes as indicated by the arrow in Figure 9(C). 15 Figure 10 shows a simulation of the Smith chart of an inverted F-shaped antenna. The ι (〇) graph shows the change in impedance at the connector position of 2〇〇1111. Change the frequency from 800MHz to 1.1GHz, and the impedance does not change as the arrow of the ι〇(Α). Figure 10(B) shows the change in impedance at 25mm across the connector position. When the frequency is changed from 800MHz to ughz, the impedance changes as indicated by the arrow in Figure 2(10). Figure 1(c) shows the change in impedance at 3 〇mm across the connector. Changing the frequency from 8〇〇MHz to 丨iGHz 蛉, the impedance changes as indicated by the arrow in Figure 10(C). The measured value of the resistance shown in Fig. 1 shows the same change as the simulation result shown in Fig. 9. 0 15 1310160 However, it is preferable that the impedance change of the inverted F-shaped antenna 1〇 is smaller. This is because when the impedance is greatly changed by the frequency, it is difficult to match the capacitance value of ^^2G. The inverted F-shaped antenna 1 shown in Fig. 1 has a small change in impedance as shown in Figs. 9 and 1 and is therefore easily matched with the 1C wafer 20. Moreover, the impedance change caused by the frequency is small, so that the frequency band in which the radio wave is used can be expanded. Next, the change in characteristics of the inverted F-shaped antenna 10 when the RFID tag of Fig. 1 is attached to the metal case will be described. Fig. 11 is a perspective view showing an RFID tag attached to a metal case which is a characteristic change model. The metal casing 81 shown in the drawing is iron and has a size of 70 mm x 100 mm x 5 mm. The metal casing 81 has a conductivity of lxl07S/m. The RFID tag 51 is an RFID tag shown in Fig. 1 and has an inverted f-shaped antenna 10 and a film 30. Also, the position of the jumper 12 is 35 mm. Further, the film 30 has a thickness of 〇2 mm, and the inverted F-shaped antenna 10 is in a state of being floated by 0.2 m from the metal 15 case 81.

Figure 12 is a graph showing the relationship between the frequency and capacitance of an individual RFID tag and a metal housing. The solid line in the figure indicates the relationship between the frequency and the capacitance value of the individual RFID tag 51 shown in Fig. 11. The broken line in the figure indicates the relationship between the frequency and the capacitance value 20 when the RFID tag 51 shown in Fig. 11 is attached to the metal case 81. As shown in the figure, by attaching the RFID tag 51 to the metal case 81, the capacitance value is increased by about 0.085 pF as a whole. Fig. 13 is a graph showing the relationship between frequency and gain of an individual RFID tag and a metal case. The solid line in the figure indicates the relationship between the frequency and the gain of the individual RFID tag 51 shown in Fig. 11. The dotted line in the figure indicates the relationship between the frequency and the gain when the RFID tag 51 shown in Fig. 11 161010160 is attached to the metal casing 81. As shown in the figure, the RFID tag 51 is attached to the metal casing 81 so that the added value is increased in part of the frequency. As described above, by attaching the RFID tag 51 to the metal case 81, the impedance 5 and the gain are changed. Therefore, as long as the design of the metal case to be attached is made, the transmission distance of the radio wave can be further lengthened.

Next, a description will be given of a transmission distance predictor when the 1C chip is used for the RFID tag of Fig. 1 when the transmission distance of a 1C chip is 200 mm when the half-wavelength folded dipole antenna is used for wireless communication. 10 Fig. 14 is a schematic view showing the gain of the 1C wafer when used for the RFID tag of Fig. 1 when the transmission distance of a 1C wafer for wireless communication using a half-wavelength folded dipole antenna is 2.15 m. When a 1C wafer having a transmission distance of 2.15 m for wireless communication using a half-wavelength folded dipole antenna is used for the RFID tag of Fig. 1, the gain of the inverted F-shaped antenna 10 becomes as shown in the figure. In addition, the figure in the figure indicates the gain of the jumper 12 of the inverted F-shaped antenna 10 at 20 mm; the figure is the gain of the inverted F-shaped antenna 1 at the position of the connector 12 at 25 mm. The Δ in the figure (black triangle in the figure) refers to the gain of the cross-connector 12 of the inverted F-shaped antenna 10 at a position of 30 mm; the X in the figure refers to the position of the jumper 12 of the inverted-F-shaped antenna 10. The gain is 20 at 3 5 mm. As shown, at 950 MHz, the gain is substantially reduced by a factor of 2.2 dBi to 1.3 dBi. The position of the jumper 12 is lowered by 2.0dBi at 25mm. The gain of the half-wavelength folded dipole antenna is 2dBi, so in the RFID tag of Fig. 1, the gain for the half-wavelength folded bipolar is decreased by 17 1310160. Therefore, it becomes 10 04 χ 2.15 and Um, folded at half wavelength. The ic chip system with a transmission distance of 15m is mounted on the RFID-labeled 'figure transmission distance of 1.1m. • Second, explain the directionality of RFID tags. 5々 Figure 15—a diagram illustrating the directivity of an RFID tag. The RFID tag is shown in the figure as shown in the x-y coordinate plane. Also, make the RFID tag of the figure the first! The RFm tag shown in the figure. Fig. 16 is a view showing the directivity of the RFID tag of Fig. 15. > RF15_ shows the RFm tag as shown in Fig. 16, which is 10 4 曰 in the x-axis direction, not the y-axis direction. Thus, it is configured to form a flat inverted F-shaped antenna 1〇 in the film 3〇, which is thin and elastic, and can be attached to the curved surface of the metal casing. Moreover, the structure is simple, and thus the manufacturing cost can be reduced. Further, the film 30 is attached in such a manner that the radiation element 15 11 of the inverted f-shaped antenna 1 formed, the jumper 12 and the power supply portion 13 are protruded from the metal, because even if it is attached to the metal Can also be a correspondent. Further, when the RFID tag is attached to an object other than metal, it is not necessary to project the radiating element 11, the jumper plug 2, and the portion of the power supply portion 13 to be attached. 20 Next, a second embodiment of the present invention will be described with reference to the drawings. In the first embodiment, as illustrated in Fig. 1, the power supply portion 13 is connected to one end of the radiation element 11. The jumper 12 is located between both ends of the radiation element 11. In the second embodiment, the jumper 12 is connected to one end of the radiating element 11, and the power supply 13 is located between the ends of the radiating element 11. 18 1310160 Figure 17 is a plan view of the RFID tag of the second embodiment. 111711) The label is constructed as shown by the inverted F-shaped antenna 90, the ic wafer 1 and the film 110. The inverted F-shaped antenna 90 is formed of, for example, a metal foil and attached to the film 110. Further, in Fig. 17, the state in which the RFID tag is mounted on the metal casing 120 such as an electric machine is shown. The inverted F sub-antenna 90 is constructed by a radiation element 91, a power supply unit 92, a jumper plug 93, and a ground plane 94. The radiating element 91 is formed in the same length as one side of the ground plane 94, and one end thereof is connected to the jumper 93, and the other end is in an open state. Further, a power supply portion 92 is provided between both ends of the radiation element 91. An Ic chip 1 is mounted between the power supply unit 92 and the ground plane 94. The ICa chip 100 is interconnected with the reader by a radio wave such as a UHF band of 953 MHz, interposed by the inverted F antenna. The IC chip 1 writes the data received by the reader and, in turn, sends the read data to the reader. The film 10 on which the inverted F-shaped antenna 90 is formed is attached to the radiation element 91, the power supply portion 92, and the jumper 93 in a state of being protruded from the metal casing 12 (outside the metal casing 120). . The adhesion of the RF1D label to the metal case can be adhered by double-sided tape or by adhesive. In addition, in the figure, after the power supply portion 92 provided with the grounding surface 94 and one side 20 of the jumper connector 93 are aligned with one side of the metal casing 120, the film 110 is adhered to the radiation element 91, the power supply portion 92 and the jumper connector. 93 is protruded from the metal casing 12〇. In this manner, when the radiation element 91, the power supply portion 92, and the jumper 93 are formed so as not to overlap with the metal casing 120, a radio wave transceiver can be made between the reader and the reader. The distance X between the power supply portion 92 and the jumper connector 93 is resisted by the resistance of the IC chip. The position of the power supply unit 92 is matched by the impedance of the 1C wafer 100, and the size of the film 110 is the same as or larger than the outer frame of the inverted F-shaped antenna 90. The font antenna 9 is adhered to the film 11 . Further, the material and manufacturing method of the inverted F-shaped antenna 9 〇 'film 11 同样 are the same as those of the first embodiment shown in Fig. 1, and therefore the description thereof will be omitted. Next, the impedance change of the inverted inverted antenna 9 频率 will be described. Figure 18 is a schematic diagram of the simulation of the Smith chart of the inverted F-shaped antenna. (A) in the figure shows the change in impedance when the jumper position is at 20 mm. When the frequency 10 is changed from 800 MHz to i.iGHz, the impedance changes as shown by the arrow symbol in (a). (B) in the figure shows the change in impedance when the jumper position is 25 mm. When the frequency is changed from 800 MHz to 1.1 GHz, the impedance changes as indicated by the arrow symbol in (B). Further, in the inverted F-shaped antenna 90 of Fig. 17, as shown in Fig. 18, the impedance variation of I5 is larger than that of the inverted F-shaped antenna 1 of Fig. i. For this reason, according to the inverted F-type antenna 9A of Fig. 17, it is difficult to obtain impedance matching with respect to the inverted F-shaped antenna 1〇 of the second figure. Further, since the impedance of the frequency changes greatly, the inverted-F sub-array 9 of the (10) is narrower than the inverted-F-shaped antenna of Fig. 1 and can be used. Thus, the jumper 93 is located at one end of the radiating element 91. When the power supply portion 92 is located between the two ends of the radiating element 91, the RFID can also be adhered to the metal casing 120 for wireless communication. Further, when the RFID tag is attached to an object other than metal, it is not necessary to make the portion of the radiation element 11, the jumper 12, and the power supply portion 13 protrude. 20 Ϊ 310160 The above description is only illustrative of the principles of the invention. Many variations and modifications may be made by those skilled in the art, and the present invention is not limited to the above-described embodiments, and all the modifications and equivalents of the correct structure and application form are still considered to be covered. The scope of the invention disclosed in the scope of the invention and its equivalents are disclosed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view of an RFID tag of a first embodiment. Figure 2 shows the equivalent circuit diagram of the inverted F-shaped antenna and IC chip of Figure No. 1〇 Figure 3 shows the relationship between the position of the jumper and the capacitance value of the inverted F-shaped antenna. Figure 4 is a graph showing the relationship between the position of the jumper of the inverted F-shaped antenna and the resistance value. Figure 5 is down? A perspective view of a font antenna attached to a copper plate. 15 Fig. 6 is a diagram showing the relationship between the position of the jumper of the inverted F-shaped antenna, the capacitance value, the resistance value, and the transmission distance of the electric wave. Fig. 7 is a perspective view showing a state in which the RFID tag of Fig. 1 is attached to the back surface of the liquid crystal of the notebook type P C . Fig. 8 is a perspective view showing the strong image of the RFID tag of Fig. 1 attached to the fingerprint 20 of the notebook PC. Figure 9 is a schematic diagram of the simulation of the Smith chart of the inverted F-shaped antenna. The first round line shows a graph of the measured values of the Smith chart of the inverted F-shaped antenna. Fig. 11 is a perspective view showing an RFID tag attached to a metal casing as a model of characteristic change. 21 1310160 Figure u shows the relationship between the frequency and capacitance of the *RFID tag individual and the metal case. Figure 13 is a graph showing the relationship between the frequency and gain of the RFID tag unit and its application to the metal case. Figure 14 is a graph showing the gain of the IC chip when it is used for the RJID label of the i-th image when the transmission distance of an IC chip with a half-wavelength folded dipole antenna for wireless communication is 215 m.

Figure 15 is a schematic diagram for explaining the directivity of an RFID tag. Figure 16 is a schematic illustration of the directivity of the RHD tag of Figure 15. Fig. P is a plan view of the RFID tag of the second embodiment. Figure 18 is a schematic diagram of the simulation of the Smith chart of the inverted F-shaped antenna. [Description of main component symbols] 10... inverted F-shaped antenna 11... radiating element 12... jumper plug-in 13... power supply section

14·.. Grounding surface 20·..1C Wafer 30··. Film 40···Metal housing 22

Claims (1)

ΤΉ ΓΠ ~---_ JU 〇ϋ 1^94121611 __ Please _ 囿 龙 97 97.10.23 X. Patent application scope: 1 · - A kind of wireless frequency identification tag, which can be attached to metal, including : Film; and the formation of a flat surface on the aforementioned film? a type of antenna; 5 the film is attached to the radiation element of the inverted F-shaped antenna formed thereon, the jumper and the power supply portion are adhered by the metal, and from the radiation element The length of the "total jumper plug-in and the aforementioned power supply unit" is shorter than one-fourth of the 10 wavelengths of the wireless signal used. 2. The _ rate identification of the fourth item of claim 4, wherein the power supply portion is formed at the end of the radiation element, and the jumper is formed between the two ends of the radiation element. . 3. In the case of the radio frequency identification tag of claim 2, in which the impedance (4) of the half (four) device is half-pinned. 4. In the case of applying for a patent, the aforementioned ferrule is formed at the __ meta-end, and the aforementioned power supply portion is formed between the two ends of the radiating element. 20 5. For the wireless frequency of item 4 of Zhongyun Yunwei, the position of the power supply unit is determined by the impedance matching of the mounted semiconductor device: state. 6_ The radio frequency identification target according to the scope of the patent application, wherein the inverted F-shaped antenna is printed (4) on the film. 23 1310160 7. The radio frequency identification tag of claim 1, wherein the inverted F-shaped antenna is formed by a metal foil and adhered to the film. 8. The radio frequency identification tag of claim 1, wherein the inverted F-shaped antenna is formed on the film by evaporation. 5 9. The radio frequency identification tag of claim 1, wherein the inverted F-shaped antenna is formed by etching a metal laminated on the film. 10. The radio frequency identification tag of claim 1, wherein the film is formed of polyethylene terephthalate. 10 24 1310160 VII. Designated representative map: (1) The representative representative of the case is: (1). (2) The symbol of the symbol of this representative diagram is briefly described: 10.. Inverted F-shaped antenna 11.. Radiation element 12.. . Jumper plug. 13.. Power supply section 14.. Ground plane 20: . 1C wafer 30.. . film 40.. .Metal shell 8. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: