JP2004253858A - Booster antenna device for ic tag - Google Patents

Booster antenna device for ic tag Download PDF

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Publication number
JP2004253858A
JP2004253858A JP2003039373A JP2003039373A JP2004253858A JP 2004253858 A JP2004253858 A JP 2004253858A JP 2003039373 A JP2003039373 A JP 2003039373A JP 2003039373 A JP2003039373 A JP 2003039373A JP 2004253858 A JP2004253858 A JP 2004253858A
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Japan
Prior art keywords
booster antenna
tag
housing
antenna
booster
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Pending
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JP2003039373A
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Japanese (ja)
Inventor
Shiro Sugimura
詩朗 杉村
Masahiro Takeda
雅宏 武田
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FEC Inc
Minerva KK
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FEC Inc
Minerva KK
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Priority to JP2003039373A priority Critical patent/JP2004253858A/en
Publication of JP2004253858A publication Critical patent/JP2004253858A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10158—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
    • G06K7/10178—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Support Of Aerials (AREA)
  • Near-Field Transmission Systems (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a booster antenna device ensuring a communication distance of an IC tag T in an enclosure K. <P>SOLUTION: A booster antenna B is arranged facing the opening part K1 of an enclosure K. By mounting a resonance circuit in resonance with an operating frequency of the IC tag T in the enclosure K on the booster antenna B, and electromagnetically coupling it to both an antenna La of a reader/writer A and the IC tag T, two-way data exchange between the reader/writer A and the IC tag T is realized. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、ＩＣタグが物品の金属製の筐体内に設置されていても、ＩＣタグの通信距離を十分確保することができるＩＣタグ用のブースタアンテナ装置に関する。
【０００２】
【従来の技術】
非接触形のＩＣタグ（ＩＣカード、ＩＣチップを含む、以下同じ）の通信距離（情報伝達距離）を大きくするために、ブースタアンテナを使用することがある。
【０００３】
従来のブースタアンテナは、シート状の基板上にコイル、コンデンサによる共振回路を形成し、共振回路をＩＣタグの使用周波数に共振させている。そこで、このものは、ブースタアンテナのコイルを介してＩＣタグ上のＩＣチップのアンテナ、リーダライタのアンテナを電磁結合させることにより、ＩＣチップの送受信感度を向上させ、ＩＣタグの通信距離を大きくすることができる。
【０００４】
【発明が解決しようとする課題】
かかる従来技術によるときは、ＩＣタグが物品の金属製の筐体内に設置されていると、筐体外のブースタアンテナと筐体内のＩＣタグとの電磁結合を実現することができないため、ＩＣタグの実質的な通信距離が不足しがちであるという問題が避けられなかった。
【０００５】
そこで、この発明の目的は、かかる従来技術の問題に鑑み、ブースタアンテナを筐体内に設け、筐体の開口部に臨ませることによって、筐体内のＩＣタグの通信距離を十分確保することができるＩＣタグ用のブースタアンテナ装置を提供することにある。
【０００６】
【課題を解決するための手段】
かかる目的を達成するためのこの発明の構成は、物品の金属製の筐体内に配設するブースタアンテナを備えてなり、ブースタアンテナは、筐体内に配設するＩＣタグの使用周波数に共振する共振回路を搭載するとともに、筐体の開口部に臨ませて配設し、ＩＣタグに電磁結合させることをその要旨とする。
【０００７】
なお、ブースタアンテナの下面には、磁性シート材を付設することができる。
【０００８】
また、ブースタアンテナ、ＩＣタグの間には、補助ブースタアンテナを配設し、補助ブースタアンテナは、ＩＣタグの使用周波数に共振する共振回路を搭載し、ブースタアンテナは、補助ブースタアンテナを介してＩＣタグに電磁結合させることができる。
【０００９】
なお、補助ブースタアンテナは、順に電磁結合させる２組以上を設けてもよく、補助ブースタアンテナの下面には、磁性シート材を付設してもよい。
【００１０】
【作用】
かかる発明の構成によるときは、ブースタアンテナは、物品の筐体の開口部に臨ませて配設され、筐体内のＩＣタグに電磁結合されている。そこで、筐体外のリーダライタからの電波は、筐体の開口部を介してブースタアンテナの共振回路を励振し、ブースタアンテナを介してＩＣタグに確実に到達するから、ＩＣタグ上のＩＣチップは、たとえば負荷変調方式によりリーダライタとの間に双方向のデータ交換をすることができる。
【００１１】
ブースタアンテナに付設する磁性シート材は、ブースタアンテナを金属製のシャーシ板などに貼り付けて設置しても、ブースタアンテナの共振回路のコイルからの磁界を通す磁路を形成し、磁界をコイルの上方に正しく分布させることができるから、ブースタアンテナの性能を劣化させることがなく、その設置用のスペースを最少にすることができる。ただし、このときのブースタアンテナは、たとえば絶縁性のシート材またはフィルム材に対し、螺旋状のコイルと、平行電極形のコンデンサとを組み合わせて導電パターンによる共振回路を形成し、磁性シート材は、コイルの全面積に対応可能な大きさにしてブースタアンテナの下面に貼り合わせるものとする。なお、磁性シート材は、ＩＣタグの使用周波数における損失が小さく、透磁率が十分大きなフェライト材やパーマロイ材の他、プラスチック、ゴムなどの可撓性のシート材に多量の磁性体粉末を混入して形成するシート材、たとえばＮＥＣトーキン（株）製の商品名「バスタレイド」などを使用することができる。
【００１２】
ブースタアンテナ、ＩＣタグの間に配設する補助ブースタアンテナは、それを介してブースタアンテナをＩＣタグに電磁結合させ、筐体外のリーダライタからの電波をＩＣタグに到達させることができる。なお、補助ブースタアンテナは、ブースタアンテナとＩＣタグとの間に電波を中継するから、筐体内において、ブースタアンテナとＩＣタグとの間にシールド性の接地導体が介在するような場合であっても、接地導体を迂回する信号経路を容易に形成することができる。
【００１３】
２組以上の補助ブースタアンテナを設ければ、ブースタアンテナとＩＣタグとの間の筐体内の信号経路の自由度を一層向上させることができる。
【００１４】
補助ブースタアンテナに付設する磁性シート材も、補助ブースタアンテナを金属製のシャーシ板などに貼り付けて設置することを可能にする。なお、このときの補助ブースタアンテナの構造や、磁性シート材の仕様は、ブースタアンテナの構造や、ブースタアンテナ用の磁性シート材の仕様と全く同様である。
【００１５】
【発明の実施の形態】
以下、図面を以って発明の実施の形態を説明する。
【００１６】
ＩＣタグ用のブースタアンテナ装置は、物品の金属製の筐体Ｋ内に配設するブースタアンテナＢを備えてなる（図１）。ただし、物品は、たとえば図示しないコンベヤラインを介し、図１の紙面に垂直方向に搬送されているものとする。
【００１７】
物品の筐体Ｋ内には、非接触形のＩＣタグＴが配設されている。また、筐体Ｋの外部には、ＩＣタグＴと双方向にデータ交換するリーダライタＡが配設され、リーダライタＡには、アンテナＬａ が付設されている。
【００１８】
ブースタアンテナＢは、筐体Ｋ内において、筐体Ｋの開口部Ｋ１ に臨ませて配設されている。ブースタアンテナＢは、絶縁性のシート材またはフィルム材からなる基材１１上に、二次元の螺旋状のコイルＬ、平行電極形のコンデンサＣを含む共振回路１２が導電パターンとして形成されている（図２）。なお、基材１１の片面には、磁性シート材１３が一体に貼り合わせるようにして付設されている。共振回路１２は、リーダライタＡのアンテナＬａ とともに、ＩＣタグＴの使用周波数に共振しているものとする。
【００１９】
搬送中の物品がリーダライタＡの近傍を通過すると、リーダライタＡのアンテナＬａ は、筐体Ｋの開口部Ｋ１ を介してブースタアンテナＢのコイルＬと電磁結合する（図３）。また、ブースタアンテナＢのコイルＬは、筐体Ｋ内において、ＩＣタグＴ上のＩＣチップＴ１ のアンテナＬｔ と電磁結合するように配置されている。ただし、図３において、符号Ｍ１ 、Ｍ２ は、それぞれアンテナＬａ とコイルＬとの間、コイルＬとアンテナＬｔ との間の電磁結合を示す。
【００２０】
そこで、リーダライタＡを作動させると、リーダライタＡのアンテナＬａ からの電波は、ブースタアンテナＢを介してＩＣタグＴのアンテナＬｔ に到達するから、ＩＣタグＴ上のＩＣチップＴ１ に電力を供給してＩＣチップＴ１ を作動させることができ、併せて、ＩＣチップＴ１ に対して必要なデータを伝送することができる。一方、ＩＣチップＴ１ からのデータは、たとえば負荷変調方式によりリーダライタＡに伝送され、判読することができる。すなわち、リーダライタＡは、ブースタアンテナＢを介し、ＩＣタグＴとの間に双方向のデータ交換をすることができる。
【００２１】
なお、図１において、アンテナＬａ 、ブースタアンテナＢ、ＩＣタグＴの機械的な相対位置関係は、図３のような電磁結合Ｍ１ 、Ｍ２ を実現することができればよく、必ずしも直線的に配置する必要がない。また、ブースタアンテナＢは、磁性シート材１３を下側にして金属製のシャーシ板などに貼り付けて設置しても、コイルＬからの磁界を基材１１、コイルＬ上に正常に分布させることができる。さらに、開口部Ｋ１ は、電波が透過する絶縁材製のカバーなどにより機械的に閉じてもよい。
【００２２】
【他の実施の形態】
物品の筐体Ｋ内において、ブースタアンテナＢ、ＩＣタグＴの間には、補助ブースタアンテナＢａ を配設することができる（図４）。
【００２３】
補助ブースタアンテナＢａ は、ブースタアンテナＢと同一構造に構成され、そのコイルＬがブースタアンテナＢのコイルＬ、ＩＣタグＴのアンテナＬｔ の双方の間に電磁結合Ｍ３ 、Ｍ２ を形成するように配置されている。そこで、リーダライタＡは、ブースタアンテナＢ、補助ブースタアンテナＢａ を介し、ＩＣタグＴとの間に双方向のデータ交換を実現することができる。ただし、筐体Ｋ内において、ブースタアンテナＢ、補助ブースタアンテナＢａ 、ＩＣタグＴの機械的な相対位置関係は、電磁結合Ｍ３ 、Ｍ２ を実現し得る限り、任意に設定することができる。
【００２４】
なお、図４において、補助ブースタアンテナＢａ は、２組以上を使用し、それぞれのコイルＬ、Ｌ…が順に電磁結合するように配置することも可能である。
【００２５】
以上の説明において、ブースタアンテナＢ、補助ブースタアンテナＢａ は、金属製のシャーシ板などに貼り付けて使用しない場合、磁性シート材１３を省略することができる。また、ブースタアンテナＢ、補助ブースタアンテナＢａ の各共振回路１２は、それぞれ基材１１を省略し、絶縁性の磁性シート材１３上に直接形成してもよい。さらに、補助ブースタアンテナＢａ は、ブースタアンテナＢより機械的に大きくしてもよく、小さくしてもよい。なお、この発明は、金属製の筐体Ｋ内にＩＣタグＴを内蔵させる任意の物品を識別対象として適用することができ、ここでいう筐体Ｋとは、物品を収納する容器やケースなどを含むものとする。
【００２６】
【発明の効果】
以上説明したように、この発明によれば、物品の筐体内に設けるブースタアンテナを筐体の開口部に臨ませることによって、ブースタアンテナは、筐体外のリーダライタからの電波を筐体内のＩＣタグに確実に到達させることができるから、筐体内のＩＣタグの通信距離を十分に確保することができるという優れた効果がある。
【図面の簡単な説明】
【図１】使用状態模式説明図
【図２】ブースタアンテナの分解斜視図
【図３】使用状態説明図（１）
【図４】使用状態説明図（２）
【符号の説明】
Ｋ…筐体
Ｋ１ …開口部
Ｔ…ＩＣタグ
Ｂ…ブースタアンテナ
Ｂａ …補助ブースタアンテナ
１２…共振回路
１３…磁性シート材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a booster antenna device for an IC tag that can sufficiently secure a communication distance of the IC tag even when the IC tag is installed in a metal case of an article.
[0002]
[Prior art]
In order to increase the communication distance (information transmission distance) of a non-contact type IC tag (including an IC card and an IC chip, the same applies hereinafter), a booster antenna may be used.
[0003]
In a conventional booster antenna, a resonance circuit including a coil and a capacitor is formed on a sheet-like substrate, and the resonance circuit resonates at a frequency used by an IC tag. Therefore, in this device, the antenna of the IC chip on the IC tag and the antenna of the reader / writer are electromagnetically coupled via the coil of the booster antenna, thereby improving the transmission / reception sensitivity of the IC chip and increasing the communication distance of the IC tag. be able to.
[0004]
[Problems to be solved by the invention]
According to such a conventional technique, if the IC tag is installed in the metal housing of the article, electromagnetic coupling between the booster antenna outside the housing and the IC tag in the housing cannot be realized. The problem that the actual communication distance tends to be short was inevitable.
[0005]
Accordingly, an object of the present invention is to provide a booster antenna in a housing and face the opening of the housing in view of the problem of the related art, so that the communication distance of the IC tag in the housing can be sufficiently ensured. An object of the present invention is to provide a booster antenna device for an IC tag.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the configuration of the present invention includes a booster antenna disposed in a metal casing of an article, and the booster antenna is configured to resonate with a use frequency of an IC tag disposed in the casing. The gist of the present invention is to mount a circuit, dispose the circuit so as to face an opening of a housing, and electromagnetically couple to an IC tag.
[0007]
In addition, a magnetic sheet material can be attached to the lower surface of the booster antenna.
[0008]
An auxiliary booster antenna is provided between the booster antenna and the IC tag. The auxiliary booster antenna has a resonance circuit that resonates at a frequency used by the IC tag. The booster antenna has an IC via the auxiliary booster antenna. It can be electromagnetically coupled to the tag.
[0009]
The auxiliary booster antenna may be provided with two or more sets that are sequentially electromagnetically coupled, and a magnetic sheet material may be provided on the lower surface of the auxiliary booster antenna.
[0010]
[Action]
According to the configuration of the invention, the booster antenna is disposed so as to face the opening of the housing of the article, and is electromagnetically coupled to the IC tag in the housing. Therefore, the radio wave from the reader / writer outside the housing excites the resonance circuit of the booster antenna through the opening of the housing and reaches the IC tag via the booster antenna without fail. For example, bidirectional data exchange can be performed with a reader / writer by a load modulation method.
[0011]
The magnetic sheet material attached to the booster antenna forms a magnetic path through which the magnetic field from the coil of the resonance circuit of the booster antenna passes, even if the booster antenna is attached to a metal chassis plate or the like. Since the booster antenna can be correctly distributed upward, the performance of the booster antenna is not deteriorated, and the space for installing the booster antenna can be minimized. However, the booster antenna at this time forms a resonance circuit by a conductive pattern by combining a spiral coil and a parallel electrode type capacitor with respect to, for example, an insulating sheet material or a film material. The size of the coil must be large enough to accommodate the entire area of the coil, and the coil is bonded to the lower surface of the booster antenna. The magnetic sheet material has a small loss at the operating frequency of the IC tag and a large amount of magnetic powder mixed with a flexible sheet material such as plastic or rubber, in addition to ferrite material and permalloy material having sufficiently large magnetic permeability. For example, a sheet material formed by extrusion, for example, a product name “BUSTARADE” manufactured by NEC TOKIN Corporation can be used.
[0012]
The auxiliary booster antenna disposed between the booster antenna and the IC tag can electromagnetically couple the booster antenna to the IC tag via the auxiliary booster antenna, and can transmit radio waves from a reader / writer outside the housing to the IC tag. Note that the auxiliary booster antenna relays radio waves between the booster antenna and the IC tag. Therefore, even if a shielded ground conductor is interposed between the booster antenna and the IC tag in the housing. A signal path bypassing the ground conductor can be easily formed.
[0013]
If two or more sets of auxiliary booster antennas are provided, the degree of freedom of the signal path in the housing between the booster antenna and the IC tag can be further improved.
[0014]
The magnetic sheet material attached to the auxiliary booster antenna also enables the auxiliary booster antenna to be attached to a metal chassis plate or the like. The structure of the auxiliary booster antenna and the specifications of the magnetic sheet material at this time are exactly the same as the structure of the booster antenna and the specifications of the magnetic sheet material for the booster antenna.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings.
[0016]
The booster antenna device for an IC tag includes a booster antenna B disposed in a metal housing K of an article (FIG. 1). However, it is assumed that the articles are being conveyed in a direction perpendicular to the paper surface of FIG. 1 via, for example, a conveyor line (not shown).
[0017]
A non-contact IC tag T is provided in the housing K of the article. A reader / writer A for bidirectional data exchange with the IC tag T is provided outside the housing K, and the reader / writer A is provided with an antenna La.
[0018]
The booster antenna B is disposed inside the housing K so as to face the opening K1 of the housing K. In the booster antenna B, a resonance circuit 12 including a two-dimensional spiral coil L and a parallel electrode type capacitor C is formed as a conductive pattern on a base material 11 made of an insulating sheet material or film material (see FIG. 1). (Fig. 2). Note that a magnetic sheet material 13 is attached to one surface of the base material 11 so as to be integrally bonded. The resonance circuit 12 resonates with the antenna La of the reader / writer A at the operating frequency of the IC tag T.
[0019]
When the article being conveyed passes near the reader / writer A, the antenna La of the reader / writer A is electromagnetically coupled to the coil L of the booster antenna B via the opening K1 of the housing K (FIG. 3). Further, the coil L of the booster antenna B is arranged in the housing K so as to be electromagnetically coupled to the antenna Lt of the IC chip T1 on the IC tag T. However, in FIG. 3, symbols M1 and M2 indicate electromagnetic coupling between the antenna La and the coil L and between the coil L and the antenna Lt, respectively.
[0020]
Then, when the reader / writer A is activated, the electric wave from the antenna La of the reader / writer A reaches the antenna Lt of the IC tag T via the booster antenna B, so that power is supplied to the IC chip T1 on the IC tag T. As a result, the IC chip T1 can be operated, and at the same time, necessary data can be transmitted to the IC chip T1. On the other hand, data from the IC chip T1 is transmitted to the reader / writer A by, for example, a load modulation method, and can be read. That is, the reader / writer A can perform bidirectional data exchange with the IC tag T via the booster antenna B.
[0021]
In FIG. 1, the mechanical relative positional relationship between the antenna La, the booster antenna B, and the IC tag T may be such that the electromagnetic couplings M1 and M2 as shown in FIG. There is no. Further, even if the booster antenna B is attached to a metal chassis plate or the like with the magnetic sheet material 13 facing down, the magnetic field from the coil L can be normally distributed on the base material 11 and the coil L. Can be. Further, the opening K1 may be mechanically closed by a cover made of an insulating material through which radio waves can pass.
[0022]
[Other embodiments]
An auxiliary booster antenna Ba can be provided between the booster antenna B and the IC tag T in the housing K of the article (FIG. 4).
[0023]
The auxiliary booster antenna Ba has the same structure as the booster antenna B, and is arranged such that its coil L forms electromagnetic couplings M3 and M2 between both the coil L of the booster antenna B and the antenna Lt of the IC tag T. ing. Therefore, the reader / writer A can realize bidirectional data exchange with the IC tag T via the booster antenna B and the auxiliary booster antenna Ba. However, in the housing K, the mechanical relative positional relationship between the booster antenna B, the auxiliary booster antenna Ba, and the IC tag T can be arbitrarily set as long as the electromagnetic coupling M3, M2 can be realized.
[0024]
In FIG. 4, two or more auxiliary booster antennas Ba may be used and arranged so that the coils L, L... Are electromagnetically coupled in order.
[0025]
In the above description, when the booster antenna B and the auxiliary booster antenna Ba are not used by being attached to a metal chassis plate or the like, the magnetic sheet material 13 can be omitted. Further, each of the resonance circuits 12 of the booster antenna B and the auxiliary booster antenna Ba may be formed directly on the insulating magnetic sheet material 13 without the base material 11. Further, the auxiliary booster antenna Ba may be mechanically larger or smaller than the booster antenna B. Note that the present invention can be applied to any object in which the IC tag T is built in a metal housing K as a target to be identified. Shall be included.
[0026]
【The invention's effect】
As described above, according to the present invention, the booster antenna provided in the housing of the article faces the opening of the housing, so that the booster antenna transmits radio waves from a reader / writer outside the housing to the IC tag in the housing. Therefore, there is an excellent effect that the communication distance of the IC tag in the housing can be sufficiently secured.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a use state. FIG. 2 is an exploded perspective view of a booster antenna. FIG.
FIG. 4 is an explanatory view of a use state (2).
[Explanation of symbols]
K: Housing K1 Opening T: IC tag B: Booster antenna Ba: Auxiliary booster antenna 12: Resonant circuit 13: Magnetic sheet material

Claims (5)

物品の金属製の筐体内に配設するブースタアンテナを備えてなり、該ブースタアンテナは、前記筐体内に配設するＩＣタグの使用周波数に共振する共振回路を搭載するとともに、前記筐体の開口部に臨ませて配設し、前記ＩＣタグに電磁結合させることを特徴とするＩＣタグ用のブースタアンテナ装置。A booster antenna disposed in a metal housing of the article, the booster antenna having a resonance circuit that resonates with a frequency used by an IC tag disposed in the housing, and an opening of the housing. A booster antenna device for an IC tag, wherein the booster antenna device is disposed so as to face a unit and is electromagnetically coupled to the IC tag. 前記ブースタアンテナの下面には、磁性シート材を付設することを特徴とする請求項１記載のＩＣタグ用のブースタアンテナ装置。The booster antenna device for an IC tag according to claim 1, wherein a magnetic sheet material is attached to a lower surface of the booster antenna. 前記ブースタアンテナ、ＩＣタグの間には、補助ブースタアンテナを配設し、該補助ブースタアンテナは、前記ＩＣタグの使用周波数に共振する共振回路を搭載し、前記ブースタアンテナは、前記補助ブースタアンテナを介して前記ＩＣタグに電磁結合させることを特徴とする請求項１または請求項２記載のＩＣタグ用のブースタアンテナ装置。An auxiliary booster antenna is provided between the booster antenna and the IC tag, the auxiliary booster antenna includes a resonance circuit that resonates at a frequency used by the IC tag, and the booster antenna includes the auxiliary booster antenna. The booster antenna device for an IC tag according to claim 1, wherein the booster antenna device is electromagnetically coupled to the IC tag via an IC tag. 前記補助ブースタアンテナは、順に電磁結合させる２組以上を設けることを特徴とする請求項３記載のＩＣタグ用のブースタアンテナ装置。The booster antenna device for an IC tag according to claim 3, wherein two or more pairs of the auxiliary booster antennas are sequentially electromagnetically coupled. 前記補助ブースタアンテナの下面には、磁性シート材を付設することを特徴とする請求項３または請求項４記載のＩＣタグ用のブースタアンテナ装置。The booster antenna device for an IC tag according to claim 3 or 4, wherein a magnetic sheet material is attached to a lower surface of the auxiliary booster antenna.
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