JP2006067478A - Rfid data carrier - Google Patents

Rfid data carrier Download PDF

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Publication number
JP2006067478A
JP2006067478A JP2004250542A JP2004250542A JP2006067478A JP 2006067478 A JP2006067478 A JP 2006067478A JP 2004250542 A JP2004250542 A JP 2004250542A JP 2004250542 A JP2004250542 A JP 2004250542A JP 2006067478 A JP2006067478 A JP 2006067478A
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Prior art keywords
radiator
antenna
data carrier
line width
distance
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JP2004250542A
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JP4379875B2 (en
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Naoji Yasui
直司 安井
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Kobayashi Kirokushi Co Ltd
小林記録紙株式会社
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Abstract

To adjust the strength of antenna directivity.
In an RFID data carrier 1 having an IC part 3 and an antenna part 4 on a base material 2, the shape of the antenna part 4 is sandwiched between a linear radiator 4-1 and a radiator 4-1. The pattern shape has linear waveguides 4-2 and 4-2 arranged in parallel on both sides, and the line width of the radiator 4-1 and the line width of the waveguide 4-2 are 3 to 15 mm, respectively. And the interval between the radiator 4-1 and the one-side waveguide 4-2 is set shorter than the interval between the radiator 4-1 and the other-side waveguide 4-2. It was.
[Selection] Figure 1

Description

  The present invention relates to an RFID data carrier in which various types of data are transmitted and received by radio waves without contact.

  Conventionally, as a method for managing various data related to articles such as goods and luggage, data using an RFID data carrier attached to the article and a reader / writer (hereinafter referred to as “R / W”) provided with an antenna and a controller. A carrier system has been established. In this type of system, radio waves controlled by the R / W controller can be transmitted from the R / W antenna, and various data can be read from and written to the RFID data carrier without contact. An RFID data carrier generally has an IC portion and an antenna portion mounted on a synthetic resin base material. Various shapes of patterns as shown in FIG. 5 are known as the shape of the antenna portion. It has been.

  FIG. 5a shows a dipole antenna having a pair of dipole elements 71 and 71 extending on the same straight line with the IC portion as the center. FIG. 5 b shows a three-element Yagi antenna, which includes a linear radiator 81 having an IC portion, a linear waveguide 82 shorter than the radiator 81, and a linear reflection longer than the radiator 81. The radiator 83 is arranged in parallel at equal intervals on both sides of the radiator 81. Further, FIG. 5 c shows a bidirectional Yagi antenna, which includes a linear radiator 91 having an IC portion, and linear waveguides 92 and 92 having the same length shorter than that of the radiator 91 sandwich the radiator 91. They are arranged in parallel at equal intervals on both sides.

  By the way, in the data management using the above-described data carrier system, it is convenient that the direction of an article such as a product or a package can be identified by the RFID data carrier. However, even if the data carrier is attached to the article in a predetermined direction, the antenna-shaped data carrier shown in FIG. 5 has the following problems.

  First, in the case of a dipole antenna, as shown by a broken line in FIG. 5, the omnidirectionality is close to a figure 8, and there is no difference in directivity strength between the left and right sides of the dipole element 71. Cannot be identified. In the case of the three-element Yagi antenna, the main lobe on the director 82 side has a strong directivity, but on the contrary, the directivity of the back lobe on the reflector 83 side is extremely small, so in terms of communication distance. Disadvantageous. Furthermore, in the case of the three-element bidirectional Yagi antenna, the right and left sides of the radiator 91 have equal directivity, so that the direction of the data carrier cannot be identified like the dipole antenna.

  Although an example of a modified Yagi antenna is disclosed in Patent Document 1, although this antenna can have directivity in a plurality of directions, the intensity of the directivity is constant, and the strength of directivity is reduced. It is impossible to adjust.

JP-A-11-112230

  The present invention has been made in view of such circumstances, and an object thereof is to provide an RFID data carrier capable of adjusting the strength of directivity of an antenna unit.

  In order to solve the above-described problems, the present invention provides an IC unit including a communication unit that performs data communication using radio waves from an external R / W and a storage unit that stores data in a readable and writable manner on an insulating base. An RFID data carrier comprising a conductive antenna unit connected to the IC unit, wherein the antenna unit includes a radiator composed of linear elements, and radiators on both sides of the radiator. And a line width of the radiator and the waveguide is set within a range of 3 to 15 mm, and radiation is performed. The distance between the radiator and the one-side director and the distance between the radiator and the other-side director are set to different lengths.

  In the above configuration, for example, when the interval between the radiator and the one-side waveguide is set longer than the interval between the radiator and the other-side waveguide, in the antenna portion of the RFID data carrier, The directivity on one side with respect to the radiator can be weaker than that on the other side.

  In addition, the reason why the line width of the radiator and the director is in the range of 3 to 15 mm is that the line width is less than 3 mm, the communication distance with the external R / W antenna on both sides centering on the radiator This is because the difference does not appear, and if the line width exceeds 15 mm, the communication distance becomes extremely short. In consideration of both the maximum communication distance and the difference between the left and right sides, it is more preferable that the distance be in the range of 8 to 10 mm.

  Furthermore, in the present invention, the base material can be made of paper, and in this case, the change in dielectric constant between the paper base material and the antenna portion is smaller than that of the antenna portion, And it is preferable to form the coating layer which has water resistance. According to such a configuration, even if the base material is damp and contains moisture, the coating layer has little change in dielectric constant and does not absorb radio waves, so that the resonance frequency deviation of the antenna portion is reduced. Thus, it is possible to prevent a decrease in communication distance with the R / W antenna.

  According to the present invention, in the antenna portion of the RFID data carrier, the radiator and the director are arranged in a simple manner by simply setting the line length and line width of the radiator and the director, and the distance between the radiator and the director. Thus, there is an effect that a difference in strength of antenna directivity can be provided on both sides.

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

  FIG. 1 is a plan view showing the configuration of an RFID data carrier according to the present invention, FIG. 2 is a cross-sectional view of the data carrier, FIG. 3 is an enlarged view of a main part showing the shape of an antenna part, and FIG. It is a directional characteristic diagram schematically showing a region.

  As shown in FIG. 1, an RFID data carrier 1 according to this embodiment is obtained by mounting an IC unit 3 and an antenna unit 4 on a base material 2 molded into a required shape. The communication method of the RFID data carrier 1 employs a radio wave method using a radio wave having a frequency of microwave (2.45 GHz), and communication is performed in comparison with other communication methods such as an electrostatic coupling method and an electromagnetic induction method. It is characterized by a relatively wide distance. Then, by transmitting the microwave radio wave controlled by the external R / W controller from the R / W antenna and receiving the transmitted radio wave by the antenna unit 4 of the RFID data carrier 1, the R / W and the RFID Various data is transmitted and received to and from the data carrier 1 without contact.

  The base material 2 is made of an insulating material and is made of, for example, a synthetic resin such as PET, or various papers such as high-quality paper, coated paper, and synthetic paper. When paper is used, the RFID data carrier 1 can be manufactured at a lower cost and thinner and lighter than when synthetic resin is used. Further, there is an advantage that necessary items can be printed on the substrate 2.

  As shown in FIG. 2, when the base material 2 is made of paper, the covering layer is provided between the base material 2 and the antenna unit 4 in order to prevent the paper from being damp and changing the dielectric constant. 6 is preferably formed. The covering layer 6 is made of a material having a small change in dielectric constant as compared with the antenna portion and having water resistance. Such materials include styrene resins such as polystyrene and ABS resins, olefin resins such as polypropylene, polyethylene and polybutylene, engineering plastics such as polyphenylene sulfide and polycarbonate, polyvinyl chloride, acrylic resins, fluororesins, phenols. Examples thereof include resins. As the formation method, a method of sticking a film made of these synthetic resins with a pressure-sensitive adhesive on the substrate 2 or a method of printing an ultraviolet curable ink or an evaporation drying type ink containing these synthetic resins is adopted. Can do.

  According to such a configuration, even if the substrate 2 is damp and contains moisture, the coating layer 6 has little change in dielectric constant and does not absorb radio waves. It is possible to prevent a reduction in communication distance with the R / W antenna.

  The IC unit 3 includes communication means for communicating various data with the R / W controller via the R / W antenna, and storage means for storing various data in a readable / writable manner. For example, the communication circuit And a thin IC chip with a built-in memory can be used. Further, by using an EEPROM or a flash memory as a memory, a battery-less data carrier can be obtained.

  The antenna unit 4 is made of a conductive film, and is configured, for example, by pattern-printing a conductive ink containing silver paste, graphite, carbon or the like on the substrate 2. The antenna unit 4 in this embodiment employs a bidirectional Yagi antenna shape consisting of three elements as the pattern shape of the elements. That is, the antenna unit 4 includes a radiator 4-1 composed of one element and waveguides 4-2, 4-2 composed of two elements.

  The radiator 4-1 is composed of a linear element, and a pair of power feeding portions 5 and 5 are provided at the center end portion thereof. The radiator 4-1 has a function of capturing a radio wave transmitted from an external R / W antenna or a radio wave sent from a director 4-2, and a function of radiating a radio wave toward the R / W antenna. have. The pair of power supply units 5 and 5 are electrically connected to the communication circuit of the IC unit 3, and power is supplied to the communication circuit by radio waves captured by the radiator 4-1.

  The director 4-2 is made of a linear element, and is arranged in parallel to the radiator 4-1 on both the left and right sides with the radiator 4-1 interposed therebetween. Unlike the radiator 4-1, the director 4-2 is parasitic, and acts to send the radio wave toward the radiator 4-1, while strengthening the radio wave transmitted from the R / W antenna. In the present embodiment, one element of the director 4-2 is provided on each side of the radiator 4-1. However, the present invention is not limited to this, and a plurality of elements may be arranged side by side.

  In the present embodiment, the purpose is to adjust the strength of the directivity of the antenna unit 4, but as the configuration for that purpose, the line length and line width of the elements in the radiator 4-1 and the wave director 4-2, The distance between the radiator 4-1 and the director 4-2 is set as follows.

As shown in FIG. 3, the line length L 1 of the element of the radiator 4-1, it is set according to the wavelength of a radio wave to be used is the lambda / 2 wavelength and lambda. Here, when the frequency is f [Hz] and the speed of light is c [m / s], the wavelength λ [m] is obtained by the following equation.

In this embodiment, the frequency f is a radio wave of 2.45 [GHz] = 2.45 × 10 9 [Hz], and the light velocity c is 3.0 × 10 8 [m / s]. When λ is obtained by the above equation 1, it is about 0.122 [m]. Therefore, the line length L 1 of the element of the radiator 4-1 may be set to approx. 62 mm.

Further, the line width W 1 of the element of the radiator 4-1 is set in the range of 3 to 15 mm. This is because, when the line width W 1 is shorter than 3 mm, in the right and left sides of the antenna portion 4 around the radiator 4-1 is because the difference in the communication distance between the external R / W antenna can not appear, When the line width W 1 is longer than 15 mm, this time is because the communication distance is shortened. Note that according to the Examples described below, in terms of both maximum communication distance with its left-right difference, the line width W 1 of the element of the radiator 4-1, more preferably in the range of 8~10mm good.

The line length L 2 of the element of the director 4-2 is set to be slightly shorter than the line length L 1 of the element of the radiator 4-1, that is, λ / 2, and is about 52 mm in this embodiment. Has been. Further, the line width W 2 of the elements of the waveguide 4-2, the reasons described above, within the scope of same 3~15mm the line width W 1 of the element of the radiator 4-1, more preferably 8~10mm Set within range.

The distance between radiator 4-1 and director 4-2 is set to different lengths on the left and right sides with respect to radiator 4-1, and the side on which antenna directivity is to be weakened, that is, the side on which communication distance is to be shortened. Is set longer than the opposite interval. In this embodiment, in FIG. 3, the distance S 1 between the radiator 4-1 and the left waveguide 4-2 is set to about 25 mm, and the radiator 4-1 and the right waveguide 4-2 are of which spacing S 2 is set to about 30 mm, and is set slightly shorter than the distance it is the right side of the left side of the gap.

  According to the above configuration, as shown in FIG. 4, when the vertical polarization horizontal plane directivity is viewed with respect to the RFID data carrier 1, the antenna unit 4 has the right directivity around the radiator 4-1. It becomes possible to weaken the sex more than that on the left side.

  Thus, since the antenna directivity can be increased or decreased on both the left and right sides of the radiator 4-1, the following applications are conceivable. For example, when the present invention is applied to vehicle entry / exit management, an RFID data carrier 1 in which the strength of antenna directivity is adjusted with respect to the traveling direction of the vehicle is attached to the vehicle body, and a vehicle gate with an R / W antenna attached thereto; A data carrier system in which an R / W controller for controlling the gate is installed can be constructed. In this case, not only can various data related to the vehicle be managed, but it can also be identified whether the vehicle has passed through the gate in the forward direction or has passed through the gate in the reverse direction, and the convenience of the storage management system is improved. There are advantages.

In the above-described embodiment, an example of a radio wave system using a radio wave having a frequency of microwave (2.45 GHz) is described as a communication system of the RFID data carrier 1, but a radio wave having a frequency of UHF (956 MHz) is used. The same applies to the radio wave system. In this case, as the configuration of the antenna unit 4, the line length L 1 of the element of the radiator 4-1 is λ / 2 (about 157 mm), and the line length L 2 of the element of the director 4-2 is from λ / 2. Set to a slightly shorter length. Moreover, radiators 4-1 and the line width W 1 of the element in the waveguide 4-2 and W 2 is set within a range of well 3~15mm as in the microwave (more preferably 8 to 10 mm), What is necessary is just to set the space | interval of the radiator 4-1 and the director 4-2 to a different length in both right and left sides centering on the radiator 4-1.

  As a result, as in the case of the microwave described above, it becomes possible to adjust the strength of the antenna directivity on both the left and right sides with respect to the radiator 4-1, and the maximum communication distance is about 4 m. The communication distance can be extended compared to.

  Hereinafter, specific examples of the present invention will be described with reference to measurement results.

[Examination of differences in antenna shape]
As the pattern shape of the antenna portion in the RFID data carrier, the dipole antenna, the three-element Yagi antenna and the three-element bidirectional Yagi antenna described with reference to FIG. The communication distance (reading distance) was measured. The measurement results are shown in Table 1 below. The shape of each antenna part of the RFID data carrier is as follows (A) to (D), but the configuration other than the antenna part is the same, and the radio wave used for the measurement is microwave (2.45 GHz). It was.

(A) Dipole antenna Dipole element: Line width 5mm, line length 68mm
(B) 3-element Yagi antenna Radiator: Line width 5 mm, line length 68 mm
Waveguide ... Line width 5mm, line length 47mm
Reflector: Line width 5 mm, line length 70 mm
Distance between radiator and reflector (left side) ... 24mm
Distance between radiator and director (right side): 31 mm
(C) 3-element bidirectional Yagi antenna Radiator: Line width 8mm, line length 66mm
Waveguide ... Line width 8mm, line length 52mm
Spacing between radiator and waveguide (left side) ... 25mm
Distance between radiator and director (right side) ... 25mm
(D) Product of the present invention Radiator ... Line width 8mm, line length 66mm
Waveguide ... Line width 8mm, line length 52mm
Spacing between radiator and waveguide (left side) ... 25mm
Distance between radiator and director (right side) ... 30mm

  As is clear from Table 1, in the dipole antenna (A), the left and right communication distances are equal, and it is impossible to add strength to the directivity on the left and right sides of the antenna. The (B) three-element Yagi antenna is excellent in the communication distance of the main lobe on the right (director) side, but the communication distance of the back lobe on the left (reflector) side is extremely short. It can be seen that there is too much difference in directivity between the left and right sides. Furthermore, although the communication distance of the three-element bidirectional Yagi antenna of (C) is longer than that of the dipole antenna, the left and right communication distances are the same as the dipole antenna of (A), and the directivity on the left and right sides of the antenna is strong and weak. I couldn't attach it.

  On the other hand, according to the product of the present invention of (D), the communication distance can be extended both on the left and right as compared with the dipole antenna of (A), and communication on one side is performed like the three-element Yagi antenna of (B). It has been found that the difference in directivity between the left and right sides of the antenna can be appropriately set without extremely reducing the distance.

[Control of difference in reading distance between antenna left and right]
Regarding the dimensions of the antenna part of the RFID data carrier, the line width and length of the radiator and the director, and the left and right distance between the radiator and the director are changed, and the difference between the maximum reading distance and the left and right distance at that time Was measured. The measurement results are shown in Table 2 below. The radio wave used for the measurement was microwave (2.45 GHz), and the following four types of radiators and directors were used.

(1) Sample A, A, C Radiator ... Line width 5mm, Line length 62mm
Waveguide ... Line width 5mm, line length 52mm
(2) Sample D, E, F Radiator ... Line width 8mm, line length 66mm
Waveguide ... Line width 8mm, line length 52mm
(3) Sample key, ku, ke Radiator ... Line width 10mm, Line length 64mm
Waveguide ... Line width 10mm, line length 54mm
(4) Sample ko, sa, shi radiator ... Line width 15mm, Line length 62mm
Waveguide ... Line width 15mm, line length 54mm

  Referring to the measurement results in Table 2, when the line width of the radiator and the director is 5 mm, as in samples A, A, and C, the antenna section There was almost no difference in the reading distance between left and right.

  When the line width of the radiator and the director is 8 mm as in the case of Sample D, E, and F, the difference in the reading distance between the left and right does not appear in the Sample D where the distance between the left and right of the radiator and the director is equal. In the samples A and F, where the left and right spacings of the radiator and the waveguide are different, a difference in the left and right reading distances appears, and the directivity of the antenna unit can be given to the left and right.

  When the line width of the radiator and the director is 10 mm as in the case of the sample key, the difference between the left and right reading distances does not appear in the sample key where the distance between the left and right of the radiator and the director is equal. The difference between the left and right reading distances was observed between the sample and the sample with different distances between the left and right of the radiator and the waveguide, and the directivity of the antenna unit could be given to the left and right.

  When the line width of the radiator and the director is 15 mm as in the case of the sample K, S, and S, the difference between the left and right reading distances does not appear in the sample K where the distance between the left and right of the radiator and the director is equal. The difference between the left and right reading distances was observed between the sampler and shi, where the left and right spacings of the radiator and the waveguide were different, and the directivity of the antenna unit could be given to the left and right. In addition, it can be seen that the maximum reading distance is shortened in the samples “K”, “S”, and “S” compared to the case where the line width is 8 mm or 10 mm.

  As is clear from the above measurement results, the difference between the left and right reading distances is large when the line widths of the radiator and the director are 8 mm and 10 mm. Accordingly, it has been found that it is appropriate to set the line width of the radiator and the director within the range of 8 mm to 10 mm.

The top view which shows the structure of the RFID data carrier based on this invention. AA sectional view taken on the line in FIG. The principal part enlarged view which shows the shape of an antenna part. The directional characteristic figure which shows the communicable area | region of the RFID data carrier which concerns on this invention. The directional characteristic figure which shows the communicable area | region of the conventional antenna shape.

Explanation of symbols

1 RFID data carrier 2 substrate 3 IC unit 4 antenna unit 4-1 radiator 4-2 waveguide 5 feeding unit 6 coating layer L 1 line width of length W 1 radiator element radiator element L 2 line spacing length W 2 linewidth S 1 radiator element of director and left waveguide spacing S 2 radiators and right waveguides of element director

Claims (2)

  1. On an insulating substrate, there is provided an IC unit having communication means for communicating data by radio waves from an external R / W and storage means for storing data in a readable / writable manner, and a conductive antenna connected to the IC part An RFID data carrier comprising a portion,
    The antenna unit is formed in a pattern having a radiator composed of a linear element and a waveguide composed of a linear element arranged in parallel to the radiator on both sides of the radiator. With
    The line width of the radiator and the director is set within a range of 3 to 15 mm, and the distance between the radiator and the one-side waveguide, and the distance between the radiator and the other-side waveguide, RFID data carriers characterized in that are set to different lengths.
  2.   The base material is made of paper, and a coating layer having a small change in dielectric constant and water resistance is formed between the base material and the antenna part as compared with the antenna part. The RFID data carrier according to claim 1.
JP2004250542A 2004-08-30 2004-08-30 RFID data carrier Active JP4379875B2 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008040583A (en) * 2006-08-02 2008-02-21 Toppan Printing Co Ltd Holder for rfid tag
JP2008509597A (en) * 2004-08-06 2008-03-27 インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation Apparatus and method for constructing an antenna using wire bonds as radiating elements
KR100820545B1 (en) 2006-11-09 2008-04-07 엘지이노텍 주식회사 Rfid antenna and rfid tag
JP2008177739A (en) * 2007-01-17 2008-07-31 Nippon Signal Co Ltd:The Attachment for rfid tag and directivity-changeable rfid tag
WO2009014213A1 (en) * 2007-07-25 2009-01-29 Fujitsu Limited Wireless tag and method for manufacturing the same
JP2009022001A (en) * 2007-07-11 2009-01-29 Samsung Electro-Mechanics Co Ltd Antenna formed with case and manufacturing method thereof
KR100949583B1 (en) 2007-04-03 2010-03-25 가부시키가이샤 히타치세이사쿠쇼 Media case and circuit pattern sheet
US7782213B2 (en) 2007-03-26 2010-08-24 Brother Kogyo Kabushiki Kaisha Apparatus for producing RFID labels and RFID label
JP2013115460A (en) * 2011-11-25 2013-06-10 Yagi Antenna Co Ltd Directional antenna

Families Citing this family (1)

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JP2011159212A (en) * 2010-02-03 2011-08-18 Toppan Forms Co Ltd Noncontact data transmission/reception object and heavy load detector using the same

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008509597A (en) * 2004-08-06 2008-03-27 インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation Apparatus and method for constructing an antenna using wire bonds as radiating elements
JP2008040583A (en) * 2006-08-02 2008-02-21 Toppan Printing Co Ltd Holder for rfid tag
KR100820545B1 (en) 2006-11-09 2008-04-07 엘지이노텍 주식회사 Rfid antenna and rfid tag
JP2008177739A (en) * 2007-01-17 2008-07-31 Nippon Signal Co Ltd:The Attachment for rfid tag and directivity-changeable rfid tag
US7782213B2 (en) 2007-03-26 2010-08-24 Brother Kogyo Kabushiki Kaisha Apparatus for producing RFID labels and RFID label
KR100949583B1 (en) 2007-04-03 2010-03-25 가부시키가이샤 히타치세이사쿠쇼 Media case and circuit pattern sheet
JP2009022001A (en) * 2007-07-11 2009-01-29 Samsung Electro-Mechanics Co Ltd Antenna formed with case and manufacturing method thereof
US8120539B2 (en) 2007-07-11 2012-02-21 Samsung Electro-Mechanics Co., Ltd. Antenna formed with case and method of manufacturing the same
US8387232B2 (en) 2007-07-11 2013-03-05 Samsung Electro-Mechanics Co., Ltd. Method of manufacturing antenna formed with case
WO2009014213A1 (en) * 2007-07-25 2009-01-29 Fujitsu Limited Wireless tag and method for manufacturing the same
US8570173B2 (en) 2007-07-25 2013-10-29 Fujitsu Limited Radio frequency tag and method of manufacturing the same
JP2013115460A (en) * 2011-11-25 2013-06-10 Yagi Antenna Co Ltd Directional antenna

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