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WO2021145044A1 - Antenne à fente pour dispositif de lecture/écriture d'étiquette rfid, et dispositif de lecture/écriture pour étiquette rfid - Google Patents

Antenne à fente pour dispositif de lecture/écriture d'étiquette rfid, et dispositif de lecture/écriture pour étiquette rfid Download PDF

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Publication number
WO2021145044A1
WO2021145044A1 PCT/JP2020/039832 JP2020039832W WO2021145044A1 WO 2021145044 A1 WO2021145044 A1 WO 2021145044A1 JP 2020039832 W JP2020039832 W JP 2020039832W WO 2021145044 A1 WO2021145044 A1 WO 2021145044A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
slot
electrode
rfid tag
reader
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/039832
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English (en)
Japanese (ja)
Inventor
詩朗 杉村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Phoenix Solution Co Ltd
Original Assignee
Phoenix Solution Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Phoenix Solution Co Ltd filed Critical Phoenix Solution Co Ltd
Priority to JP2021527909A priority Critical patent/JP7031924B2/ja
Publication of WO2021145044A1 publication Critical patent/WO2021145044A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas

Definitions

  • the present invention relates to a slot antenna for an RFID tag reader / writer and an RFID tag reader / writer device using the slot antenna.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2004-199226
  • the non-communication area can be reduced, stable communication with the tag can be performed, and the influence on the device installed near the antenna is affected.
  • Disclosed are reader / writer antennas that can be suppressed and RFID systems with such antennas.
  • the reader / writer antenna described in Patent Document 1 (Japanese Unexamined Patent Publication No. 2004-199226) and the RFID system provided with the antenna are the reader / writer antenna composed of a plurality of loop antennas, and each of the plurality of loop antennas is ,
  • the currents are arranged so as to be adjacent to each other at least one loop antenna, and the phases of the currents supplied to at least two adjacent loop antennas are different from each other.
  • Patent Document 2 Japanese Unexamined Patent Publication No. 2009-159240
  • a predetermined wireless IC tag and an antenna are simultaneously used.
  • an antenna built into a housing and a label printer using the antenna which can perform reliable wireless communication only between the antennas.
  • the housing-embedded antenna of Patent Document 2 Japanese Unexamined Patent Publication No. 2009-159240
  • An antenna connected to a writer and arranged in a housing, wherein the antenna is a horn antenna, and the horn antenna is a feeding element, a metal body having a horn shape, and the inside of the horn shape of the metal body. It is characterized by containing a dielectric material filled in the antenna.
  • Patent Document 3 Japanese Unexamined Patent Publication No. 2009-273011
  • a portable RFID reader that appropriately controls gain and directivity without causing an increase in cost, an increase in housing size, or a decrease in reliability. It is disclosed about the writer.
  • the portable RFID reader / writer of Patent Document 3 Japanese Unexamined Patent Publication No. 2009-273011 is a portable RFID reader / writer in which a dipole antenna for transmitting and receiving radio waves to and from an RF tag is provided in a housing.
  • a non-feeding element is provided in at least one of the positions where the Yagi antenna waveguide is formed with respect to the dipole antenna element and the position where the Yagi antenna reflector is formed with respect to the dipole antenna element. It is characterized in that a detachable attachment / detachment mechanism is provided.
  • Patent Document 4 Japanese Unexamined Patent Publication No. 2019-161490 realizes a cavity slot antenna applicable to a small communication terminal such as an RFID tag, and discloses miniaturization and high performance.
  • the antenna device described in Patent Document 4 Japanese Unexamined Patent Publication No. 2019-161490 is arranged via an air layer or a dielectric layer substantially parallel to a substrate having a ground conductor and the ground conductor, and at least a part of the antenna device is refracted.
  • a flat plate-shaped antenna conductor having a closed polygonal slot, a plurality of short-circuit conductors connecting the antenna conductor and the ground conductor, and a plurality of short-circuit conductors arranged in the vicinity of any one of the plurality of short-circuit conductors.
  • the outer peripheral length of the slot is approximately 1 ⁇ to 2 ⁇ , and the width of the slot is 0.005 ⁇ to 0.05 ⁇ .
  • the distance between the plurality of short-circuit conductors is ⁇ / 2 or less, and the distance between the antenna conductor and the ground conductor is 0.005 ⁇ to 0.05 ⁇ .
  • the RFID tag reader / writer may need to communicate with one or a part of the RFID tags and not with the other RFID tags.
  • the RFID tag manufacturing line when an RFID tag is inspected, encoded, and decoded in an assembly line using a belt conveyor or the like, there are non-target RFID tags before and after the target RFID tag. There is. In this case, it is necessary to communicate with the target RFID tag without being affected by the non-target RFID tags existing before and after the target RFID tag.
  • the conventional reader / writer antenna is affected by the non-target RFID tags existing before and after the RFID tag, so that the RFID tag cannot be inspected accurately and efficiently.
  • a reader / writer is inside a housing for storing the product. It is necessary to communicate only with the RFID tag attached to the product.
  • the conventional reader / writer has a problem that if the housing and / or the lid that closes the housing is not shielded, it also communicates with the RFID tag attached to the product outside the housing.
  • the reader / writer antenna described in Patent Document 1 includes a plurality of loop antennas, and it is necessary to adjust the phase between the loop antennas, which causes a problem that the configuration of the antenna and peripheral circuits becomes complicated. Further, the housing-embedded antenna described in Patent Document 2 needs to be provided with a metal body having a horn shape, which also complicates the configuration. Further, the portable RFID reader / writer described in Cited Document 3 also needs to be provided with a director of the Yagi antenna and / or a reflector of the Yagi antenna, which also complicates the configuration.
  • the antenna device described in Patent Document 4 includes a flat plate-shaped antenna conductor having a closed polygonal slot at least partially refracted, so that the direction perpendicular to the plane on which the slot is formed (+ Z direction).
  • the directivity of the radio wave having a rotation in the ⁇ direction is relatively large in the X direction, and the directivity is in the Y direction. Then, there is a problem that the directivity of the radio wave having a rotation in the ⁇ direction is relatively large.
  • An object of the present invention is to suppress the radiation gain of the horizontal plane and the radiation of the horizontal wave in order to prevent the influence of the RFID tag located at a remote position on the horizontal plane, and to radiate the vertical wave uniformly in one direction perpendicular to the antenna surface.
  • a second object of the present invention is to provide an antenna having the above directivity and a reader / writer connected to the antenna, and by arranging the RFID tag in a direction perpendicular to the antenna surface, another RFID in the vicinity thereof. It is an object of the present invention to provide a reader / writer device for RFID tags that can prevent the influence of the above.
  • the slot antenna is a slot antenna for a reader / writer of an RFID tag, and is provided with a first antenna board, a first electrode for slot formation provided on the first antenna board and having a spiral slit, and slot formation.
  • a second antenna for forming a spiral slot which is provided inside the slit of the first antenna for forming a slot and has a predetermined distance from the first electrode for forming a slot, a second antenna substrate facing the first antenna substrate, and a second antenna.
  • a third electrode provided on the antenna substrate and a feeding line for feeding power between the second electrode for slot formation and the third electrode are provided.
  • a slot antenna with a cavity having a slit between the slot-forming first electrode and the slot-forming second electrode as a slot is formed.
  • the slit of the slot antenna has a linear shape, but in the slot antenna that follows one aspect, the slit between the first electrode for slot formation and the second electrode for slot formation has a spiral shape.
  • the radiated radio wave (vertical wave) in the ⁇ direction tends to be large in the plane orthogonal to the longitudinal direction of the slot, and the radiated radio wave tends to be small in the longitudinal direction of the slot.
  • a reader / writer device using a linear slot antenna with a cavity is affected by the RFID tag when the RFID tag is present in a direction perpendicular to the longitudinal direction of the slot.
  • the longitudinal direction of the slit is not fixed in a fixed direction by forming the slit between the slot forming first electrode and the slot forming second electrode into a spiral shape. As a result, the radiation gain in the horizontal plane direction and the radiation of the horizontal wave are suppressed, and the vertical wave is uniformly radiated in the direction perpendicular to the first antenna surface.
  • the slot antenna that follows one aspect efficiently gives only vertical waves to the RFID tag arranged in the direction perpendicular to the first antenna board, and is less susceptible to the influence of RFID tags existing at other positions on the horizontal plane. It works. It is preferable that the first antenna board and the second antenna board face each other, and it is more preferable that the first antenna board and the second antenna board face each other in a parallel state.
  • the horizontal plane means a plane parallel to the first antenna substrate and the second antenna substrate.
  • the slot antenna according to the second invention is a slot antenna according to one aspect, in which the electrical length of the slit of the slot forming first electrode is ⁇ / 2 with the wavelength of the communication frequency as ⁇ , and the slot forming second electrode has.
  • the electrical length may be ⁇ / 4.
  • the resonance frequency of the slot antenna with the communication frequency because the gain of the antenna can be increased.
  • the electrical length is expressed based on the delay time of the radio wave, not the physical length. In the case of the present invention, the length is expressed between the first antenna board and the second antenna board. When the air layer is used, the electric length is almost the same as the physical length, but when the dielectric layer is formed between the first antenna substrate and the second antenna substrate, the electric length is longer than the physical length. Become.
  • the slot antenna according to the third invention is the slot antenna according to the second invention, in which one end in the longitudinal direction of the second electrode for slot formation is one end in the longitudinal direction of the slit of the first electrode for slot formation. It may be arranged so as to have a predetermined distance from the end portion.
  • the length of the slit between the slot-forming second electrode and the slot-forming first electrode is increased, respectively. It is preferable that the length of the slit of ⁇ / 4 and the first electrode for slot formation alone is ⁇ / 4, because the gain of the antenna can be increased.
  • a metal nut is further fixed at a position corresponding to the second electrode for slot formation of the third electrode to form a slot.
  • a metal bolt may be inserted toward the second electrode for slot formation, and a variable capacitor may be formed between the second electrode for slot formation and the third electrode.
  • the resonance frequency of the slot antenna can be finely adjusted by forming a capacitor between the second electrode for slot formation and the third electrode and adjusting the capacitance value of the capacitor.
  • the RFID tag reader / writer device includes the slot antenna according to the first to fourth aspects and the reader / writer connected to the feeder line of the slot antenna, and is located at a position facing the first antenna substrate. , Communicates with an RFID tag arranged in the direction opposite to the second antenna substrate.
  • the RFID tag reader / writer device faces the first antenna substrate. At this position, it is possible to efficiently communicate with the RFID tag arranged in the direction opposite to the second antenna substrate, and it is not easily affected by the RFID tag existing at another position on the horizontal plane.
  • the RFID tag reader / writer device is used for RFID tag inspection, encoding, and decoding, RFID tag inspection, encoding, and decoding can be performed accurately and efficiently.
  • this reader / writer device when used in a system that automates accounting in a store by reading the RFID tag attached to the product, it is possible to communicate only with the RFID tag placed upward of the slot antenna. It is possible to eliminate or simplify a shield such as a housing for avoiding the influence of RFID tags attached to other products.
  • FIG. 1 is a schematic drawing when the slot antenna 150 is viewed from the horizontal direction
  • FIG. 2 is a schematic drawing when the first antenna substrate 10 is viewed from the direction of the second antenna substrate 50
  • FIG. 3 is a second diagram. It is a schematic drawing which looked at the antenna board 50 from the direction opposite to the 1st antenna board 10.
  • the horizontal direction means a direction parallel to the first antenna board 10 and the second antenna board 50.
  • the slot antenna 150 includes a first antenna board 10 and a second antenna board 50.
  • a slot-forming first electrode 20 having a spiral-shaped slit and a slot-forming first electrode 20 are provided inside the slits for slot formation.
  • a first electrode 20 and a second electrode 30 for forming a spiral slot having a predetermined interval are provided.
  • a third electrode 55 is provided on the surface of the second antenna board 50 opposite to the first antenna board 10.
  • FR-4 normal glass epoxy substrate
  • the slot forming first electrode 20, the slot forming second electrode 30, and the third electrode 55 can be formed by plating and etching a metal such as copper, for example.
  • the SMC connector 80 is arranged at the end of the second antenna board 50, the GND side of the SMC connector 80 is connected to the third electrode 55, and the signal side passes through the strip line 70 (see FIG. 3) and the feeder line 40. It is connected to the second electrode 30 for forming a slot.
  • the first antenna board 10 and the second antenna board 50 are fixed by fixing bolts 90, fixing nuts 100, and spacers 110 so as to be substantially parallel to each other.
  • the space between the first antenna board 10 and the second antenna board 50 is an air layer in this embodiment, a structure in which a dielectric layer is sandwiched between the first antenna board 10 and the second antenna board 50 may be used.
  • the slot antenna 150 is a slot antenna with a cavity having a slit between the slot forming first electrode 20 and the slot forming second electrode 30 as a slot.
  • the length of the slit of the first electrode 20 for slot formation is preferably an electrical length of ⁇ / 2, where the wavelength of the communication frequency of the slot antenna 150 is ⁇ .
  • the length of the second electrode 30 for forming a slot is preferably an electrical length of ⁇ / 4. This is because the resonance frequency of the slot antenna 150 can be matched with the communication frequency by setting the lengths of the slit and the slot in this way.
  • the width of the slit of the slot forming first electrode 20 is about 0.016 ⁇
  • the width of the slot forming second electrode 30 is about 0.003 ⁇ . The electric length is expressed based on the delay time of the radio wave, not the physical length.
  • the slot-forming second electrode 30 has a spiral shape that maintains a predetermined distance from the slot-forming first electrode 20 from the vicinity of the central end of the slot-forming first electrode 20. Is formed in. Therefore, the slot-forming second electrode 30 does not exist near the end of the slot-forming first electrode 20 on the opposite side of the slit. Further, the predetermined interval is about 0.06 ⁇ in this embodiment.
  • the width of the slit of the first electrode 20 for slot formation is preferably in the range of 0.015 ⁇ to 0.022 ⁇ , and the width of the second electrode 30 for slot formation is preferably in the range of 0.002 ⁇ to 0.003 ⁇ . ..
  • a conductive nut 65 connected to the third electrode 55 is fixed to the second antenna substrate 50, and a conductive bolt 60 is inserted. Further, the bolt 60 extends to the vicinity of the first antenna substrate 10 and is located directly above the second electrode 30 for forming a slot (see FIGS. 1 and 2). Therefore, the bolt 60 and the second electrode 30 for slot formation form a capacitor, and the second electrode 30 for slot formation is adjusted by turning the bolt 60 and adjusting the distance between the bolt 60 and the second electrode 30 for slot formation. The capacitance value between the bolt 60 and the bolt 60 (that is, the third electrode 55) can be adjusted. Then, the resonance frequency of the slot antenna 150 can be finely adjusted by adjusting the capacitance value between the slot forming second electrode 30 and the bolt 60 (that is, the third electrode 55).
  • FIG. 4 shows a graph of the measurement results of the directivity of the vertical wave of the slot antenna 150 on the vertical plane.
  • the direction perpendicular to the first antenna substrate 10 and opposite to the second antenna substrate 50 is the + Z axis, and the angle from the + Z axis is ⁇ .
  • FIG. 5 is a schematic explanatory view showing the directivity of the vertical wave of the slot antenna 150 in the horizontal plane direction.
  • the conventional slot antenna with a cavity a linear slit is formed, and the radiated radio wave (vertical wave) in the ⁇ direction is large in the plane orthogonal to the longitudinal direction of the slot, and the radiated radio wave is small in the longitudinal direction of the slot.
  • the slot antenna will be affected by the RFID tag located in the horizontal plane direction orthogonal to the longitudinal direction of the slot.
  • the direction of the slit to which the electric field is applied is formed radially from the center of the spiral, and therefore, as shown in FIG. , There is almost no directivity depending on the direction in the XY plane, and the smaller the angle ⁇ with the + Z axis in all directions, the higher the strength of the radio wave, and the larger the ⁇ , the lower the strength of the radio wave.
  • the slot antenna 150 provided with the spiral slit of the present invention, by arranging the RFID tag 120 of the communication partner in the upward direction of the slot antenna 150, the influence of the RFID tag in the horizontal direction with respect to the RFID tag 120 is exerted. Only vertical waves can be efficiently applied to the RFID tag 120 of the communication partner without receiving the signal.
  • FIG. 6 shows a configuration diagram of a system including the reader / writer device 160 and the RFID tag 120 of the second embodiment.
  • the reader / writer device 160 is composed of a reader / writer 140 and a slot antenna 150, and communicates with an RFID tag 120 including an RFID tag antenna 125.
  • the RFID tag 120 of the communication partner is efficiently affected without being affected by the RFID tag in the horizontal direction. Only vertical waves can be given. For example, when an RFID tag is inspected, encoded, and decoded in an assembly line using a belt conveyor or the like, there are non-target RFID tags before and after the target RFID tag 120.
  • the reader / writer device 160 for RFID tag inspection needs to be able to communicate with the target RFID tag 120 without being affected by the non-target RFID tag.
  • the reader / writer device 160 provided with the slot antenna 150 of the present invention it is possible to communicate with the target RFID tag 120 without being affected by the non-target RFID tag.
  • the first antenna substrate 10 corresponds to the "first antenna substrate”
  • the slot forming first electrode 20 corresponds to the “slot forming first electrode”
  • the slot forming second electrode 30 corresponds to the "slot”.
  • the second antenna substrate 50 corresponds to the "second antenna substrate”
  • the third antenna 55 corresponds to the "third electrode”
  • the feeding line 40 corresponds to the "feeding line”.
  • the RFID tag 120 corresponds to the "RFID tag”
  • the reader / writer 140 corresponds to the "reader / writer”
  • the slot antenna 150 corresponds to the "slot antenna”
  • the bolt 60 for the variable capacitor corresponds to the "bolt”.
  • the nut 65 for the variable capacitor corresponds to the "nut”
  • the reader / writer device 160 corresponds to the "reader / writer device for RFID tag”.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Waveguide Aerials (AREA)

Abstract

Le problème décrit par la présente invention est de fournir une antenne pour un dispositif de lecture/écriture RFID configuré de telle sorte que, afin d'empêcher l'influence d'une étiquette RFID dans une position séparée sur le plan horizontal, l'antenne supprime le rayonnement d'ondes horizontales et le gain de rayonnement dans un plan horizontal, et rayonne uniformément des ondes verticales dans une direction qui est verticale par rapport à la surface d'antenne. En outre, l'invention concerne un dispositif de lecture/écriture comprenant l'antenne. La solution selon l'invention porte sur une antenne à fente 150 qui est destinée à un dispositif de lecture/écriture 140 d'une étiquette RFID 120, l'antenne à fente 150 comprenant : un premier substrat d'antenne 10 ; une première électrode 20 pour former une fente qui est disposée sur le premier substrat d'antenne et a une fente en forme de spirale ; une deuxième électrode 30 en forme de spirale pour former une fente qui est disposée à l'intérieur de la fente de la première électrode et qui est à un espace prescrit de la première électrode 20 ; un second substrat d'antenne 50 faisant face au premier substrat d'antenne ; une troisième électrode 55 disposée sur le second substrat d'antenne ; et une ligne d'alimentation électrique 40 qui fournit de l'énergie entre la deuxième électrode 30 pour former une fente et la troisième électrode 55.
PCT/JP2020/039832 2020-01-17 2020-10-23 Antenne à fente pour dispositif de lecture/écriture d'étiquette rfid, et dispositif de lecture/écriture pour étiquette rfid Ceased WO2021145044A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021527909A JP7031924B2 (ja) 2020-01-17 2020-10-23 Ｒｆｉｄタグのリーダライタ用のスロットアンテナ、および、ｒｆｉｄタグ用リーダライタ装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-005758 2020-01-17
JP2020005758 2020-01-17

Publications (1)

Publication Number Publication Date
WO2021145044A1 true WO2021145044A1 (fr) 2021-07-22

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PCT/JP2020/039832 Ceased WO2021145044A1 (fr) 2020-01-17 2020-10-23 Antenne à fente pour dispositif de lecture/écriture d'étiquette rfid, et dispositif de lecture/écriture pour étiquette rfid

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI795083B (zh) * 2021-11-19 2023-03-01 國立雲林科技大學 應用於戶外大型活動rfid系統之圓極化槽孔天線

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008028872A (ja) * 2006-07-24 2008-02-07 Hoko Denshi Kk スロットスパイラルアンテナ、及び角形スロットスパイラルアンテナ、並びに、それらの調整方法
JP2008236046A (ja) * 2007-03-16 2008-10-02 Yagi Antenna Co Ltd 小型スロットアンテナ
JP2014533454A (ja) * 2011-09-30 2014-12-11 グーグル インコーポレイテッド 導電性シャーシを有するコンピュータ用のアンテナ（発明者：ＡｊａｙＣｈａｎｄｒａＶｅｎｋａｔａＧｕｍｍａｌｌａ）

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008028872A (ja) * 2006-07-24 2008-02-07 Hoko Denshi Kk スロットスパイラルアンテナ、及び角形スロットスパイラルアンテナ、並びに、それらの調整方法
JP2008236046A (ja) * 2007-03-16 2008-10-02 Yagi Antenna Co Ltd 小型スロットアンテナ
JP2014533454A (ja) * 2011-09-30 2014-12-11 グーグル インコーポレイテッド 導電性シャーシを有するコンピュータ用のアンテナ（発明者：ＡｊａｙＣｈａｎｄｒａＶｅｎｋａｔａＧｕｍｍａｌｌａ）

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI795083B (zh) * 2021-11-19 2023-03-01 國立雲林科技大學 應用於戶外大型活動rfid系統之圓極化槽孔天線

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JP7031924B2 (ja) 2022-03-08

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