JP2007213299A - Holder for rfid tag, rfid tag, and rfid device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holder for an RFID tag, an RFID tag, and an RFID device, capable of extending surely the maximum communication distance of the RFID tag, by simple constitution, while using an existing IC inlet, and capable of compactifying further a size easily. <P>SOLUTION: This holder 27 for the RFID tag for holding removably the RFID tag 2 having a reception antenna for receiving a radio wave, and a chip connected to the antenna, is provided with a holder main body part 28 for holding the RFID tag 2, and a nonexcitation element 4 provided in the holder main body part 28, and the antenna and the nonexcitation element 4 are arranged on the substantially same plane, under the condition where the RFID tag 2 is held by the holder main body part 28. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an RFID tag holder, an RFID tag, and an RFID device.

  In recent years, RFID tags that perform communication using RFID (Radio Frequency Identification) have been used in various communication situations. RFID (Radio Frequency Identification) refers to a technology using an automatic recognition technology that performs non-contact writing and reading using wireless communication, or a product or system using the same. For example, data can be recorded on an RF tag of several millimeters to several centimeters, and the data can be read or written by radio waves (wireless communication signals) from an input / output device (reader / writer). Nowadays, it is used for IC cards such as transportation cards and electronic money, and is also used for traceability systems and goods management in addition to goods.

In such an RFID tag, the maximum communication distance with an input / output device is determined by the performance of an IC inlet composed of a chip and an antenna. In general, the maximum communication distance of an IC inlet to an input / output device is preferably as long as it is within an appropriate range.
Therefore, in order to extend the maximum communication distance, it is conceivable to increase the size of the antenna provided in the IC inlet or to suppress the power consumption of the chip provided in the IC inlet.
Moreover, the following method is proposed as a method of extending the maximum communication distance of an RFID tag (for example, refer patent document 1). That is, a holder for holding the RFID tag is provided on the wall surface of the non-metallic container, and a reflection member for reflecting radio waves is provided on the back surface of the RFID tag held by the holder. The RFID tag receives not only the radio wave from the input / output device but also the reflected wave from the reflecting member, so that the communication distance can be extended.
JP 2003-198422 A

However, increasing the size of the antenna as described above not only increases the size of the entire IC inlet, but also increases the cost of the IC inlet. Furthermore, if it is attempted to reduce the power consumption of the chip as described above, it is necessary to redevelop the chip, which requires new costs and development time.
Moreover, although the existing IC inlet can be used in the method described in Patent Document 1, an interval (about 10 mm to about 30 mm) according to the carrier wavelength is required between the antenna of the RFID tag and the reflecting member. Thus, there is a problem that the overall thickness dimension becomes large.

  The present invention has been made in view of such circumstances. With a simple configuration, the maximum communication distance of the RFID tag can be reliably extended while using an existing antenna, and further downsizing can be easily performed. It is an object of the present invention to provide an RFID tag holder, an RFID tag, and an RFID device that can be used.

In order to solve the above problems, the present invention provides the following means.
An RFID tag holder according to the present invention is an RFID tag holder that detachably holds an RFID tag having an antenna for receiving radio waves and a chip connected to the antenna, the holder for holding the RFID tag A main body portion and a non-excitation element provided on the holder main body portion, and the antenna and the non-excitation element are arranged on substantially the same plane in a state where the RFID tag is held by the holder main body portion. It is characterized by being.

In the RFID tag holder according to the present invention, the radio wave radiated from the input / output device is received by the antenna while the RFID tag is held by the holder body, and the electric power is extracted from the radio wave. At this time, a part of the radio wave radiated from the input / output device directly reaches the antenna, and the other part reaches a non-excitation element arranged on substantially the same plane as the antenna. Then, the radio wave that has reached the non-excitation element is re-radiated by the non-excitation element, and a part of the re-radiated radio wave reaches the antenna. Therefore, not only the direct radio waves radiated from the input / output device but also more radio waves are received by the antenna.
As a result, more power can be extracted from the received radio wave, and the antenna gain in the direction orthogonal to the plane on which the antenna is provided can be increased. In addition, since the non-excitation element is disposed on substantially the same plane as the antenna, the thickness dimension can be reduced.

  Further, the RFID tag holder according to the present invention is the state where the RFID tag is held by the holder main body, and the non-excitation element is on the same plane of the RFID tag provided with the antenna, or In the same plane of the RFID tag provided with an antenna, the RFID tag is arranged at a position translated from a difference area where the antenna is not provided in a direction orthogonal to the difference area.

  In the RFID tag holder according to the present invention, in a state where the RFID tag is held by the holder main body, the non-excitation element is in the same plane of the RFID tag provided with the antenna or in a direction orthogonal to the difference region. The antenna gain in the direction orthogonal to the plane can be surely increased because it is arranged at the position moved in parallel.

  In the RFID tag holder according to the present invention, the antenna and the non-excitation element are formed in a long shape, and the antenna and the non-excitation are in a state where the RFID tag is held by the holder main body. The elements are arranged such that their length directions are parallel to each other, and the non-excitation element extends in a direction that passes through a center point in the length direction of the antenna and is orthogonal to the length direction of the antenna. It is arranged on a virtual line.

  In the RFID tag holder according to the present invention, the antenna and the non-excitation element are arranged in parallel with each other in the length direction while the RFID tag is held by the holder body. In addition, since the non-excitation element is arranged on a virtual line passing through the center point in the length direction of the antenna and extending in a direction orthogonal to the length direction of the antenna, the radio wave re-radiated from the non-excitation element is Can be achieved efficiently. Therefore, the communication distance can be reliably extended.

  In the RFID tag holder according to the present invention, the antenna and the non-excitation element are formed in a long shape, and the antenna and the non-excitation are in a state where the RFID tag is held by the holder main body. The elements are arranged so that their length directions are parallel to each other, and the installation interval between the antenna and the non-excitation element is set to 0.08λ or more and 0.6λ or less of the carrier wavelength λ. Features.

  In the RFID tag holder according to the present invention, the antenna and the non-excitation element are arranged in parallel with each other in the length direction while the RFID tag is held by the holder body. Further, since the installation interval between the antenna and the non-excitation element is set to 0.08λ or more and 0.6λ or less of the carrier wavelength λ, the antenna gain in the direction orthogonal to the plane can be reliably increased.

  In the RFID tag holder according to the present invention, the antenna and the non-excitation element are formed in a long shape, and the antenna and the non-excitation are in a state where the RFID tag is held by the holder main body. The elements are arranged so that their length directions are parallel to each other, and the length dimension of the non-excitation element is set to 0.5λ or more of the carrier wavelength λ.

  In the RFID tag holder according to the present invention, the antenna and the non-excitation element are arranged in parallel with each other in the length direction while the RFID tag is held by the holder body. Further, since the length dimension of the non-excitation element is set to 0.5λ or more of the carrier wavelength λ, the antenna gain in the direction orthogonal to the plane can be surely increased.

  In the RFID tag holder according to the present invention, a plurality of the non-excitation elements may be arranged in a direction intersecting the length direction of the antenna in a state where the RFID tag is held by the holder main body. Features.

  In the RFID tag holder according to the present invention, radio waves are re-radiated from the plurality of non-excitation elements while the RFID tag is held by the holder body. Therefore, the antenna gain can be further increased.

  An RFID tag according to the present invention is an RFID tag that is detachably held in an RFID tag holder provided with a non-excitation element made of a conductor and performs communication using radio waves. An antenna for receiving is provided, and the antenna and the non-excitation element are arranged on substantially the same plane while being held by the RFID tag holder.

In the RFID tag according to the present invention, the radio wave radiated from the input / output device is received by the antenna while the RFID tag is held by the RFID tag holder, and the electric power is extracted from the radio wave. At this time, a part of the radio wave radiated from the input / output device directly reaches the antenna, and the other part reaches a non-excitation element arranged on substantially the same plane as the antenna. Then, the radio wave that has reached the non-excitation element is re-radiated by the non-excitation element, and a part of the re-radiated radio wave reaches the antenna. Therefore, not only the direct radio waves radiated from the input / output device but also more radio waves are received by the antenna.
As a result, more power can be extracted from the received radio wave, and the antenna gain in the direction orthogonal to the plane on which the antenna is provided can be increased. In addition, since the non-excitation element is disposed on substantially the same plane as the antenna, the thickness dimension can be reduced.

  The RFID device according to the present invention includes an RFID tag that performs communication using radio waves, and an RFID tag holder that detachably holds the RFID tag, and the RFID tag receives the radio waves. An antenna and a chip connected to the antenna are provided, the RFID tag holder is provided with a non-excitation element made of a conductor, and the RFID tag is held by the RFID tag holder. An antenna and the non-excitation element are arranged on substantially the same plane.

In the RFID device according to the present invention, the radio wave radiated from the input / output device is received by the antenna while the RFID tag is held by the RFID tag holder, and the electric power is extracted from the radio wave. At this time, a part of the radio wave radiated from the input / output device directly reaches the antenna, and the other part reaches a non-excitation element arranged on substantially the same plane as the antenna. Then, the radio wave that has reached the non-excitation element is re-radiated by the non-excitation element, and a part of the re-radiated radio wave reaches the antenna. Therefore, not only the direct radio waves radiated from the input / output device but also more radio waves are received by the antenna.
As a result, more power can be extracted from the received radio wave, and the antenna gain in the direction orthogonal to the plane on which the antenna is provided can be increased. In addition, since the non-excitation element is disposed on substantially the same plane as the antenna, the thickness dimension can be reduced.

  According to the present invention, the antenna gain in the direction orthogonal to the plane on which the antenna is provided can be increased by arranging the non-excitation element on the same plane as the antenna. The maximum communication distance of the RFID tag can be surely extended while being used, and the entire size can be easily reduced.

Hereinafter, an RFID device according to an embodiment of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes an RFID device.
The RFID device 1 includes an RFID tag 2 that communicates with an input / output device using radio waves, and a holder (RFID tag holder) 27 that holds the RFID tag 2.

The RFID tag 2 performs communication using microwaves (2.45 GHz).
The RFID tag 2 includes a rectangular plate-shaped tag main body 11. The tag main body 11 is made of a non-metallic substance (insulator) such as paper, PET, vinyl chloride, polycarbonate, or acrylic. One main surface 11a out of both main surfaces of the tag main body 11 is provided with description information such as characters and pictures and rewritable information (rewritable etc.). Further, the other main surface 11b is provided with an IC inlet 3 extending in a rectangular shape. The IC inlet 3 has its length direction aligned with the width direction (length direction) w of the tag main body 11. Further, the IC inlet 3 is provided in the center portion in the width direction w of the other main surface 11b, and is provided eccentric to one end side from the center portion in the height direction h of the other main surface 11b. . In addition, the area | region where IC inlet 3 is not provided among the other main surfaces 11b becomes the difference area 15.

  As shown in FIG. 3, the IC inlet 3 includes an antenna 13 for receiving radio waves from an input / output device (not shown) and an IC chip (chip) 14 having a storage unit for storing information. The antenna 13 is a half-wave dipole antenna provided with a long metal rod made of aluminum. The antenna 13 is arranged with its length direction aligned with the length direction of the IC inlet 3, and the center positions in the length direction are arranged to be aligned.

The holder 27 is made of a non-metallic substance (insulator) such as PET, vinyl chloride, polycarbonate, or acrylic. If the tag main body 11 is provided with information or rewritable information, such information is provided. Is made of a transparent material so that it can be seen from the outside.
As shown in FIGS. 1 and 2, the holder 27 includes a holder main body portion 28 having a rectangular plate-like base portion 6 and a holding portion 7 provided on one main surface 6 a of the base portion 6. ing. The holding portion 7 includes a bottom surface portion 7 a that is disposed flush with the side surface of the base portion 6 on the long side portion side. At both ends in the length direction of the bottom surface portion 7a, a pair of side surface portions 7b raised from the both ends are provided. And the front-surface part 7c extended over the bottom face part 7a and a pair of side part 7b is provided. As a result, a cavity 19 is formed between the front surface portion 7 c and the base portion 6. The upper end of the holding part 7 in the height direction h is open, and the RFID tag 2 is inserted into the cavity 19 through the open part 18. Under such a configuration, the RFID tag 2 is detachably held by being inserted into the cavity 19.

In addition, a non-excitation element 4 extending in a rectangular shape is provided on the inner surface 22 of the front surface portion 7c. The non-excitation element 4 has its length direction aligned with the width direction w, and is provided at the center of the width direction w.
Here, the installation position of the non-excitation element 4 will be described in detail. Note that, when describing the positional relationship between the antenna 13 and the non-excitation element 4, it is assumed that the RFID tag 2 is held by the holding unit 7 even if not particularly expressed. As shown in FIG. 2, the non-excitation element 4 is provided on the inner surface 22 so as to be arranged in a region of the differential region 15 of the RFID tag 2 that is opened by decentering the IC inlet 3. That is, the non-exciting elements 4 are arranged in a direction crossing the antenna 13 and its length direction, and the antenna 13 and the non-exciting elements 4 are arranged so as to be parallel to each other in the width direction w. The antenna 13 and the non-excitation element 4 are arranged on the same plane (on the other main surface 11b of the tag main body 11 or on the inner surface 22 of the front surface portion 7c). The positional relationship in the thickness direction between the antenna 13 and the non-excitation element 4 is slightly changed depending on the thickness of the cavity 19 and the tag main body 11, but is divided into a front side and a rear side by the tag main body 11. When both the antenna 13 and the non-exciting element 4 are disposed on either side of the hollow portion 19 formed, it is assumed that they are disposed on the same plane.

As shown in FIG. 1, the non-excitation element 4 passes through a center point P in the length direction of the antenna 13 and extends in the height direction h in a state where the RFID tag 2 is held by the holding unit 7. It is provided above. The virtual line R passes through the center point in the length direction of each of the antenna 13 and the non-excitation element 4.
Moreover, the length dimension of the non-excitation element 4 is set to 140 mm as shown in FIG. When this is expressed by a multiplier M with respect to the carrier wavelength λ, it is about 1.14λ. That is, the multiplier M is
Multiplier M = 140 / λ
Is calculated by Note that λ indicates the wavelength of the carrier wave (about 122.4 mm).
The height dimension H of the non-excitation element 4 is set to 40 mm. Further, the installation interval L between the IC inlet 3 and the non-excitation element 4 in a state where the RFID tag 2 is held by the holding unit 7, that is, the respective long side portions 3 a facing the IC inlet 3 and the non-excitation element 4, The distance between the long side portion 4a is set to 30 mm. When this is expressed by a multiplier for the carrier wavelength λ, it becomes 0.25λ in the same manner as described above.

  The non-excitation element 4 is a conductor such as a metal vapor deposition film or a metal stay such as aluminum, and is attached with a double-sided tape with an adhesive or an adhesive. The non-excitation element 4 may be silver vapor deposition, nickel, copper, or the like, or may be provided by printing conductive ink such as silver paste ink.

Although the non-excitation element 4 and the antenna 13 are arranged on the same plane, the present invention is not limited to this, and the shape of the tag main body 11, the installation position of the antenna 13 and the non-excitation element 4, etc. Can be appropriately changed.
For example, as shown in FIG. 5A, the non-exciting element 4 may be provided on one main surface 6a of the base portion 6 at a predetermined position similar to the above. As a result, the antenna 13 is arranged on the front side of the cavity 19 divided by the tag main body 11 into the front side and the rear side, and the non-excitation element 4 is arranged on the rear side. At this time, the non-excitation element 4 is arranged at a position translated from the difference region 15 in a direction orthogonal to the difference region 15. That is, the antenna 13 and the non-excitation element 4 are not overlapped in the thickness direction of the tag main body 11. In this case, it is assumed that the antenna 13 and the non-excitation element 4 are arranged on substantially the same plane. Needless to say, if the RFID tag 2 is inserted into the cavity portion 19 upside down, both the antenna 13 and the non-excited element 4 are arranged on the rear side and are in the same plane.

  Further, as shown in FIG. 5B, even when the antenna 13 is provided (internally) sandwiched between two tag main body portions 11 ′, the non-excitation element 4 is It is assumed that the antenna 13 and the non-excited element 4 are arranged on substantially the same plane, which are arranged at a position translated in a direction orthogonal to the difference region 15.

  Further, as shown in FIG. 6A, the non-excitation element 4 may be provided on the other main surface (outer surface) 6b of the base portion 6 at a predetermined position similar to the above. Thereby, the antenna 13 and the non-excitation element 4 are disposed with the tag main body 11 and the base 6 sandwiched therebetween. Also in this case, the non-excitation element 4 is arranged at a position translated from the difference region 15 in a direction orthogonal to the difference region 15, and the antenna 13 and the non-excitation element 4 are arranged on substantially the same plane. Shall. Note that the RFID tag 2 may be inserted into the cavity portion 19 upside down. Further, the antenna 13 may be built in the tag main body 11.

  Moreover, as shown in FIG.6 (b), you may provide the nonexcitation element 4 in the predetermined position similar to the above on the outer surface 23 of the front surface part 7c. Thereby, the antenna 13 and the non-excitation element 4 are arranged with the front surface portion 7c interposed therebetween. Also in this case, the non-excitation element 4 is arranged at a position translated from the difference region 15 in a direction orthogonal to the difference region 15, and the antenna 13 and the non-excitation element 4 are arranged on substantially the same plane. Shall. Note that the RFID tag 2 may be inserted into the cavity portion 19 upside down. Further, the antenna 13 may be built in the tag main body 11.

  In addition, as shown in FIG. 7, a rectangular plate-like support plate 5 may be provided on the other main surface 11 b of the tag main body 11, and the antenna 13 may be provided on the support plate 5. The support plate 5 is made of an insulator as described above, and supports the antenna 13. An IC chip 14 is provided on the antenna 13. That is, the antenna 13, the IC chip 14 and the support plate 5 constitute the IC inlet 3. Further, the non-excitation element 4 is provided on one main surface 6 a of the substrate portion 6. Also in this case, it is assumed that the antenna 13 and the non-excitation element 4 are arranged on substantially the same plane. It should be noted that the RFID tag 2 may be inserted into the cavity 19 with the front and back reversed. Moreover, you may change the installation position of the non-excitation element 4 similarly to the above.

Further, in FIG. 2, when the RFID tag 2 is inserted into the cavity portion 19 upside down, the IC inlet 3 and the non-excitation element 4 are arranged with the tag main body portion 11 sandwiched therebetween, and in this case also substantially on the same plane. Needless to say. In FIG. 2, the IC inlet 3 may be built in the tag main body 11.
That is, “substantially the same plane” includes not only the same plane but also the case of substantially the same plane.
The installation positions of the antenna 13 and the non-excitation element 4 can be changed as appropriate, but the non-excitation is within 20 mm from the difference area 15 where the antenna 13 is not provided in a direction orthogonal to the plane where the antenna 13 is provided. The element 4 is preferably provided. This is expressed as a multiplier of 0.16λ.

Next, the operation of the RFID tag 2 in the present embodiment configured as described above will be described. The RFID tag 2 is held by the holding unit 7, and the RFID tag 2 and the non-exciting element 4 are arranged on the XY plane as shown in FIG. In FIG. 8, an X axis, a Y axis, and a Z axis indicate axes that are orthogonal to each other.
First, the radio wave radiated from the input / output device reaches the antenna 13 from the direction intersecting the other main surface 11b of the tag main body 11, that is, from above the Z axis (in front of the holder 27). Then, a radio wave is received by the antenna 13, and power is extracted from the received radio wave. Then, the IC chip 14 is driven by the extracted electric power, and information stored in the storage unit is transmitted / received.

  Further, the radio wave radiated from the input / output device also reaches the non-excitation element 4. Then, radio waves are re-radiated by the non-excitation element 4, and the re-radiated radio waves reach the antenna 13. This re-radiated radio wave is received by the antenna 13 and electric power is taken out. In other words, power is extracted not only from the radio waves that have directly reached the antenna 13 but also from the radio waves re-radiated from the non-excitation element 4, thereby increasing the available power.

Here, an experimental result of the RFID tag 2 in the present embodiment will be described below.
Check how the beam directivity of the antenna 13 changes when the non-excitation element 4 is provided in the RFID tag 2 and when the non-excitation element 4 is not provided, and the communication distance changes. Three types of experiments were conducted.

In the first experiment, the RFID tag 2 is held by the holding unit 7 and is on the same plane as the installation surface of the IC inlet 3 and on both sides in the direction perpendicular to the length direction of the IC inlet 3. The non-exciting element 4 is arranged. FIG. 9 is an explanatory diagram showing a state in which two non-excitation elements 4 are installed on both sides of the IC inlet 3. The length direction of the IC inlet 3 is directed in the Y direction, and two non-excitation elements 4 are arranged along the Y direction with the IC inlet 3 sandwiched in the X direction orthogonal to the Y direction.
The material of the non-excitation element 4 was aluminum, and the size was 40 mm in height and 140 mm in width.

10 and 11 show a microwave band by a three-dimensional simulator HFSS when the non-excitation element 4 is not provided (IC inlet 3 alone) and when the two non-excitation elements 4 shown in FIG. 9 are provided in the IC inlet 3. It is a simulation result of (2.45 GHz). The installation interval L between the IC inlet 3 and the non-excitation element 4 was 30 mm and 60 mm.
The simulation result of FIG. 10 is a graph showing the antenna gain of the cross section (XZ plane) at the center of the antenna 13 in the X direction and the Z direction shown in FIG. Moreover, the simulation result of FIG. 11 is a graph showing the antenna gain of the cross section (YZ plane) of the center of the antenna 13 in the Y direction and the Z direction shown in FIG.

10 and 11, a line 8 on the graph is a result when the non-excitation element 4 is not provided. Line 9 is a result when the installation interval L between the IC inlet 3 and the non-excitation element 4 is 30 mm, and line 10 is a result when the installation interval L between the IC inlet 3 and the non-excitation element 4 is 60 mm. is there.
From the experimental results shown in FIGS. 10 and 11, when the non-excitation element 4 is not provided, the directivity characteristic of the 2 / λ dipole antenna appears as it is, as indicated by the line 8. When the installation interval L is 30 mm, the electromagnetic field in the X direction sandwiched between the two non-excitation elements 4 is narrowed as shown by the line 9, and as a result, the directivity increases in the Z direction. Yes. Further, when the installation interval L is 60 mm, the directivity in the Z direction is further increased as indicated by the line 10.

  From this simulation result, the directional beam shaping of the antenna 13 is performed by providing the two non-exciting elements 4, and the surface on which the antenna 13 extends and the surface on which the non-exciting element 4 extends are on the same plane (XY plane). It is estimated that the maximum gain that cannot be obtained by the IC inlet 3 alone can be obtained in the vertical direction (Z direction). In this experiment, no simulation was performed when the non-excited element 4 was provided only on one side of the IC inlet 3, but even when one non-excited element 4 was provided only on one side, Although the gain is lower than when two non-excitation elements 4 are provided, the directivity in the Z direction is estimated to increase as described above.

  Next, in the second experimental result, the installation interval L between the non-excitation element 4 made of aluminum tape and the IC inlet 3 in the microwave band (2.45 GHz) was set to 60 mm. One non-excitation element 4 was provided only on one side. And IC inlet 3 was affixed on a 125 micrometers PET base material. FIG. 12 shows the same plane of the extending surface of the antenna 13 and the extending surface of the non-excitation element 4 (on the XY plane) when the width dimension W and the height dimension H of the non-excitation element 4 are changed. ) In the vertical direction (Z direction).

As shown in FIG. 12, the communication distance when the non-excitation element 4 is not provided is 85 cm.
It can be seen that the communication distance is extended when the width dimension W of the non-excitation element 4 is in the range of 40 mm to 200 mm and the height dimension H is in the range of 10 mm to 80 mm. Expressing this as a multiplier of the carrier wavelength λ, the width is about 0.3λ to about 1.6λ, and the height is about 0.08λ to about 0.6λ. Thus, it is assumed that even with one non-excitation element 4, the gain of the antenna 13 is increased due to the directional beam shaping of the antenna 13.

  Next, in a third experiment, the IC inlet 3 was affixed on a 125 μm PET substrate using the non-excited element 4 made of aluminum tape and the microwave band (2.45 GHz) antenna 13. The size of the non-excitation element 4 was a width dimension of 140 mm and a height dimension H of 40 mm. One non-excitation element 4 was provided only on one side.

FIG. 13 shows the same plane (XY plane) of the surface on which the IC inlet 3 extends and the surface on which the non-excitation element 4 extends when the installation interval L between the non-excitation element 4 and the IC inlet 3 is changed. It is a graph of the result of having measured the communication distance of the vertical direction (Z direction) of the upper).
As shown in FIG. 13, the communication distance when the non-excitation element 4 is not provided is 85 cm.
And it turns out that a communication distance is extended in the range whose installation space | interval L is 10 mm to 80 mm. When this is expressed by a multiplier of the carrier wavelength λ, the range is from about 0.08λ to about 0.6λ. On the other hand, it can be seen that the communication distance decreases when the installation interval L is in the range of 90 mm to 120 mm. From this experiment, it is presumed that the operation related to the wavelength λ of the carrier frequency is acting on the installation interval L between the IC inlet 3 and the non-excitation element 4, and the interval in which the communication distance is extended is adopted in the present invention.

  As described above, according to the RFID device 1 of the present embodiment, the antenna 13 of the IC inlet 3 can receive more radio waves, and by extracting more power, it is orthogonal to the plane on which the antenna 13 is provided. The antenna gain in the direction can be increased. Moreover, since the antenna 13 and the non-excitation element 4 are arranged on the same plane, the overall thickness dimension can be reduced. Therefore, with a simple configuration, the maximum communication distance of the RFID tag can be reliably extended while using the existing antenna 13, and further, the overall size can be easily reduced.

Further, since the non-exciting element 4 is arranged on the virtual line R, the radio wave re-radiated from the non-exciting element 4 can efficiently reach the antenna 13. Therefore, the communication distance can be reliably extended.
Furthermore, since relatively inexpensive members, such as a metal vapor deposition film and an aluminum metal stay, can be used as the non-excitation element 4, the cost can be reduced as a whole.
Moreover, since it is not necessary to change the resonance frequency of the antenna 13, the antenna 13 which can be obtained at low cost can be used.

  In the present embodiment, the non-excitation element 4 has a rectangular plate shape, but the shape is not limited to this, and the shape can be changed as appropriate. For example, as shown in FIG. 14, it may be triangular, and the IC inlet 3 may be opposed to the apex or lower side of the triangle. Further, as shown in FIG. 15, the portion corresponding to the long side portion of the rectangle may be a triangular sawtooth shape, and the portion facing the IC inlet 3 may be a sawtooth shape portion or a long side portion. .

In addition, although the non-excitation element 4 is arranged in parallel to the antenna 13, the present invention is not limited to this, and the positional relationship can be changed as appropriate. For example, the non-excitation element 4 may be inclined with respect to the antenna 13 on the same plane. Further, the non-excitation element 4 may be inclined with respect to the antenna 13 in the thickness direction.
Furthermore, although the antenna 13 and the non-excitation element 4 are provided at the center, the present invention is not limited to this and can be changed as appropriate. For example, the non-excitation element 4 may be shifted in the length direction. However, even in that case, it is preferable that a part of the length direction of the non-excitation element 4 is arranged on the virtual line R.

In addition, the non-excitation element 4 is provided on one side of the antenna 13, but the present invention is not limited to this and may be provided on both sides.
Furthermore, although one non-excitation element 4 is provided, the present invention is not limited to this, and a plurality of non-excitation elements 4 may be provided. In this case, it is preferable to provide a plurality of antennas 13 in a direction orthogonal to the length direction of the antenna 13.
Further, the non-excitation element 4 having the above positional relationship may be provided also in the differential region 15 of the RFID tag 2. As a result, the radio wave can reach the antenna 13 more efficiently.

  Moreover, although each numerical value was described in this embodiment, it is not restricted to this, These numerical values can be changed suitably. For example, although the installation interval L is set to 30 mm, this can be changed as appropriate. However, it is also apparent from experimental results that the installation interval L is preferably 10 mm to 80 mm, that is, a multiplier of about 0.08λ to about 0.6λ. Moreover, although the width dimension W of the non-excitation element 4 is 140 mm, this can be changed as appropriate. However, the width dimension W is preferably 40 mm to 200 mm, that is, a range of about 0.3λ to about 1.6λ as a multiplier. The height dimension H of the non-excitation element 4 at this time can be changed as appropriate, but is preferably in the range of 10 mm to 80 mm, that is, a multiplier of about 0.08λ to about 0.6λ.

In addition, although the frequency of the carrier wave is 2.45 GHz, the present invention is not limited to this, and may be another microwave band or UHF band.
In the present embodiment, the RFID tag 2 is used. However, the present invention is not limited to this, and a label type or tag type may be used. These information storage media according to the present invention display instructions in the work process in a traceability system by attaching to an IC card such as a transportation card or electronic money, or an item such as a product, or various work sites. It can be used for work management.
The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

It is a figure which shows embodiment of the RFID apparatus which concerns on this invention, Comprising: It is a perspective view which shows an RFID apparatus. It is a side view of the RFID apparatus of FIG. It is explanatory drawing which expands and shows the IC inlet of FIG. It is a front view which expands and shows the RFID apparatus of FIG. It is a side view which shows the modification of the RFID apparatus of FIG. It is a side view which shows the other modification of the RFID apparatus of FIG. FIG. 10 is a side view showing still another modification of the RFID device in FIG. 2. It is explanatory drawing which shows a mode that the RFID apparatus of FIG. 1 was distribute | arranged to the three-dimensional coordinate of the XYZ axis | shaft. It is a figure which shows a mode that the IC inlet of FIG. 1 was arrange | positioned to the three-dimensional coordinate of an XYZ axis | shaft, Comprising: It is explanatory drawing which shows a mode that the non-excitation element was provided in the both sides of IC inlet. 10 is a graph showing a first experimental result of the present invention, which is a graph showing an antenna gain in the XZ plane of FIG. 9. 10 is a graph showing a first experimental result of the present invention, which is a graph showing an antenna gain in the YZ plane of FIG. 9. It is a graph which shows the 2nd experimental result of this invention, Comprising: It is a graph which shows the mode of the change of communication distance when the width direction of a non-excitation element is changed. It is a graph which shows the 3rd experimental result of this invention, Comprising: It is a graph which shows the mode of a change of communication distance when changing the installation space | interval of IC inlet and a non-excitation element. It is a front view which shows the modification of the non-excitation element of FIG. It is a front view which shows the other modification of the non-excitation element of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 RFID apparatus 4 Non-excitation element 13 Antenna 15 Difference area 26 RFID tag 27 Holder (RFID tag holder)
28 Holder body R Virtual line

Claims (8)

An RFID tag holder for detachably holding an RFID tag having an antenna for receiving radio waves and a chip connected to the antenna,
A holder main body for holding the RFID tag;
A non-excitation element provided in the holder body,
The RFID tag holder, wherein the antenna and the non-excitation element are arranged on substantially the same plane in a state where the RFID tag is held by the holder body. With the RFID tag held by the holder body,
The non-excitation element is
On the same plane of the RFID tag provided with the antenna, or
2. The RFID tag provided with the antenna, wherein the RFID tag is arranged at a position translated from a difference area where the antenna is not provided, in a direction perpendicular to the difference area, from the difference area where the antenna is not provided. The RFID tag holder according to 1. The antenna and the non-excitation element are formed in a long shape,
With the RFID tag held by the holder body,
The antenna and the non-excitation element are arranged so that their length directions are parallel,
The non-excitation element is
3. The RFID tag holder according to claim 2, wherein the RFID tag holder is disposed on an imaginary line that passes through a center point in a length direction of the antenna and extends in a direction orthogonal to the length direction of the antenna. The antenna and the non-excitation element are formed in a long shape,
With the RFID tag held by the holder body,
The antenna and the non-excitation element are arranged so that their length directions are parallel,
4. The RFID according to claim 1, wherein an installation interval between the antenna and the non-excitation element is set to 0.08λ or more and 0.6λ or less of a carrier wavelength λ. Tag holder. The antenna and the non-excitation element are formed in a long shape,
With the RFID tag held by the holder body,
The antenna and the non-excitation element are arranged so that their length directions are parallel to each other,
The RFID tag holder according to any one of claims 1 to 4, wherein a length dimension of the non-excitation element is set to 0.5λ or more of a carrier wavelength λ. With the RFID tag held by the holder body,
The RFID tag holder according to any one of claims 1 to 5, wherein a plurality of the non-excitation elements are arranged in a direction crossing a length direction of the antenna. An RFID tag that is detachably held in an RFID tag holder provided with a non-excitation element made of a conductor and performs communication using radio waves,
An antenna for receiving the radio wave;
A chip connected to the antenna,
The RFID tag, wherein the antenna and the non-excitation element are arranged on substantially the same plane while being held by the RFID tag holder. RFID tags that communicate using radio waves,
An RFID tag holder for detachably holding the RFID tag,
In the RFID tag,
An antenna for receiving the radio wave;
A chip connected to this antenna,
In the RFID tag holder,
A non-excitation element made of a conductor is provided;
The RFID device, wherein the antenna and the non-excitation element are arranged on substantially the same plane in a state where the RFID tag is held by the RFID tag holder.

Images