JP2005064799A - Rfid antenna for portable information terminal unit - Google Patents

Rfid antenna for portable information terminal unit Download PDF

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JP2005064799A
JP2005064799A JP2003291467A JP2003291467A JP2005064799A JP 2005064799 A JP2005064799 A JP 2005064799A JP 2003291467 A JP2003291467 A JP 2003291467A JP 2003291467 A JP2003291467 A JP 2003291467A JP 2005064799 A JP2005064799 A JP 2005064799A
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rfid antenna
information terminal
terminal device
antenna
rfid
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Takamitsu Nakabayashi
貴光 中林
Daisuke Ikeda
大亮 池田
Naoki Sunaga
直規 須永
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Toppan Inc
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Toppan Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To realize a stable communication by suppressing a mutual interference between a circuit component contained in a housing and an RFID antenna, and a battery and the RFID antenna. <P>SOLUTION: The portable information terminal unit includes the RFID antenna 1, and the circuit component for communicating with the RFID antenna 1. The circuit component is contained in a housing 6, and the RFID antenna 1 is rotatably or slidably mounted in this housing 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、アンテナに係り、特に、携帯型情報端末機器用ＲＦＩＤアンテナの機構に関するものである。   The present invention relates to an antenna, and more particularly to a mechanism of an RFID antenna for a portable information terminal device.

背景技術のＲＦＩＤ（Radio Frequency IDentification）は、非接触での自動認識技術である。ＲＦＩＤの適用用途は様々で、人が持って使用する非接触ＩＣカードと呼ばれるものや、物に固定して使用されるタグ形状をしたもの（Radio Frequency Tag、ＲＦタグ、ＩＣタグなどに代表されるもの）がある。   Background Art RFID (Radio Frequency IDentification) is a non-contact automatic recognition technology. RFID can be used for various purposes, such as what is called a non-contact IC card that is used by people, or a tag that is fixed to an object (typically radio frequency tags, RF tags, IC tags, etc.) There is something).

ＩＣタグの電気的構成は、コイルとこのコイルに電気的に接続されたチップ状のＩＣモジュールからなる。コイルの有するインダクタンスＬとＩＣモジュールの有するキャパシタンスＣとでＬＣ回路を構成している。このＬＣ回路の固有の共振周波数は、ＩＣタグにおいて通信するために使用する周波数に設定される。ＩＣタグは、電磁誘導によって外部から電力を得ながら、外部に設置されたリーダライタとの間で非接触通信を行う。   The electrical configuration of the IC tag includes a coil and a chip-like IC module that is electrically connected to the coil. An LC circuit is constituted by the inductance L of the coil and the capacitance C of the IC module. The inherent resonance frequency of the LC circuit is set to a frequency used for communication in the IC tag. The IC tag performs non-contact communication with a reader / writer installed outside while obtaining electric power from outside by electromagnetic induction.

ＲＦＩＤは、非接触で行われる通信であるためコイルやＩＣモジュールをカードやタグではなく筐体に収容しても実現可能であり、携帯電話やＰＤＡ（Personal Digital Assistants、情報携帯端末）等の情報端末機器に組み込んで使用することも可能である。   RFID is a non-contact communication and can be realized even if a coil or IC module is housed in a housing instead of a card or tag. Information such as mobile phones and PDAs (Personal Digital Assistants) It can also be used by being incorporated into a terminal device.

情報端末機器にＲＦＩＤ機能を設ける場合、ＲＦＩＤアンテナは情報端末機器の筐体内に配置される。ＲＦＩＤアンテナは、数ターン巻かれたコイル状に形成されている。情報端末機器は、ＲＦＩＤアンテナの中心線上にアンテナ開口部（コイルが形成された中心線付近）をほぼ覆うように情報端末機器側の回路部品及びバッテリが配置されている。   When an RFID function is provided in an information terminal device, the RFID antenna is disposed in the housing of the information terminal device. The RFID antenna is formed in a coil shape wound several turns. In the information terminal device, circuit components and a battery on the information terminal device side are arranged on the center line of the RFID antenna so as to substantially cover the antenna opening (near the center line where the coil is formed).

図３に背景技術のＲＦＩＤ機能を有する携帯型情報端末機器の構造の概略を示す。   FIG. 3 shows an outline of the structure of a portable information terminal device having an RFID function of the background art.

ＲＦＩＤ機能を有する携帯型情報端末機器は、筐体６内に、ＲＦＩＤアンテナ１と、チップ状のＩＣモジュール等の構成部材からなる回路部品７と、情報端末機器に電源を供給するためのバッテリ８とを備えて構成される。   A portable information terminal device having an RFID function includes an RFID antenna 1, a circuit component 7 made of a component such as a chip-like IC module, and a battery 8 for supplying power to the information terminal device. And is configured.

図から分かるように、ＲＦＩＤアンテナ１と回路部品７及びバッテリ８とが近接して配置されている。このため、ＲＦＩＤアンテナ１と回路部品７及びバッテリ８との相互の電磁的な干渉が生じ易い。   As can be seen from the figure, the RFID antenna 1, the circuit component 7 and the battery 8 are arranged close to each other. For this reason, mutual electromagnetic interference between the RFID antenna 1 and the circuit component 7 and the battery 8 is likely to occur.

また、この電磁的な干渉の影響を抑えるためにアモルファスシート等をＲＦＩＤアンテナ１と情報端末機器本体２との間に配置してシールド対策しているものもある。   In some cases, an amorphous sheet or the like is disposed between the RFID antenna 1 and the information terminal device main body 2 in order to suppress the influence of electromagnetic interference.

なお、この出願の発明に関連する先行技術文献情報としては、次のものがある。   The prior art document information related to the invention of this application includes the following.

特開２００３−３７８６１号公報JP 2003-37861 A

特開２００３−８７３８５号公報JP 2003-87385 A

前述したように、ＲＦＩＤアンテナと回路部品及びバッテリとの間隔が近くなるため、干渉によりＲＦＩＤの通信に悪影響を及ぼすという問題点がある。   As described above, since the distance between the RFID antenna, the circuit component, and the battery is reduced, there is a problem in that RFID communication is adversely affected by interference.

また、この干渉による影響を抑えるためにシールド対策を施す場合には、シールド対策をＲＦＩＤアンテナ全体に行う必要があるためコストが増すという問題点もある。   Further, when a shield measure is taken in order to suppress the influence of this interference, there is a problem that the cost increases because the shield measure needs to be applied to the entire RFID antenna.

そこで、本発明の目的は、ＲＦＩＤ機能を情報端末機器に搭載する際に、筐体に収容した回路部品及びバッテリとＲＦＩＤアンテナとの間の相互の干渉を抑え、安定した通信を可能にすることにある。   Therefore, an object of the present invention is to suppress the mutual interference between the circuit component and battery stored in the housing and the RFID antenna when the RFID function is mounted on the information terminal device, and enable stable communication. It is in.

本発明は上記目的を達成するために創案されたものであり、第１の発明は、ＲＦＩＤアンテナと、該ＲＦＩＤアンテナを介して通信を行う回路部品とを有する携帯型情報端末機器において、上記回路部品を筐体に収容し、この筐体に上記ＲＦＩＤアンテナを回動自在または、摺動自在に取り付けたものである。   The present invention was devised to achieve the above object, and the first invention is a portable information terminal device having an RFID antenna and a circuit component that communicates via the RFID antenna. A component is housed in a housing, and the RFID antenna is attached to the housing so as to be rotatable or slidable.

第２の発明は、上記ＲＦＩＤアンテナの一端と上記筐体の一端とを連結し、この連結箇所を軸として回動可能なヒンジを設けたものである。   According to a second aspect of the present invention, one end of the RFID antenna and one end of the housing are connected, and a hinge that can be rotated about the connection location is provided.

第３の発明は、上記ＲＦＩＤアンテナを上記筐体に沿わせて移動させるスライド部を設けたものである。   In a third aspect of the present invention, a slide portion is provided for moving the RFID antenna along the casing.

本発明によれば、筐体に収容した回路部品及びバッテリとＲＦＩＤアンテナとの間の相互の干渉を抑え、安定した通信を提供できるという優れた効果を発揮する。   According to the present invention, it is possible to suppress the mutual interference between the circuit component and the battery housed in the housing and the RFID antenna, and provide an excellent effect that stable communication can be provided.

以下、本発明の好適実施の形態を添付図面にしたがって説明する。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

図１は、本発明の好適実施の形態を示す。   FIG. 1 shows a preferred embodiment of the present invention.

図１（ａ）は、携帯型情報端末機器用ＲＦＩＤアンテナを折り畳んだ状態を示す斜景図である。図１（ｂ）は、ＲＦＩＤアンテナを開いた状態を示す斜景図である。   FIG. 1A is a perspective view showing a state in which an RFID antenna for a portable information terminal device is folded. FIG. 1B is a perspective view showing a state where the RFID antenna is opened.

ＲＦＩＤ機能を有する携帯型情報端末機器は、ＲＦＩＤアンテナ１を内蔵したアンテナ枠９と、情報端末機器本体２と、アンテナ枠９を回動自在（可能）にするためのヒンジ３とを備えて構成される。   A portable information terminal device having an RFID function includes an antenna frame 9 incorporating an RFID antenna 1, an information terminal device main body 2, and a hinge 3 for making the antenna frame 9 rotatable (possible). Is done.

図示したようにアンテナ枠９は、一端をヒンジ３の一端に連結し取り付けられている。情報端末機器本体２は、筐体６の一端を前述のヒンジ３の他端に連結し取り付けられており、アンテナ枠９と情報端末機器本体２の筐体６とは、互いにヒンジ３を介して蝶番留めになるように支持されている。   As shown, the antenna frame 9 is attached with one end connected to one end of the hinge 3. The information terminal device main body 2 is attached by connecting one end of the housing 6 to the other end of the hinge 3 described above. The antenna frame 9 and the housing 6 of the information terminal device main body 2 are connected to each other via the hinge 3. It is supported so that it can be hinged.

ＲＦＩＤアンテナ１は、導体をコイル状に数ターンから数十ターン巻いて形成されたアンテナ素子からなっており、アンテナ枠９に収納されている。ＲＦＩＤアンテナ１は図示しない外部機器（以下、リーダライタと云う。）からの電磁誘導を感知して通信するための送受信用アンテナとなっている。   The RFID antenna 1 is composed of an antenna element formed by winding a conductor in a coil shape from several turns to several tens of turns, and is housed in an antenna frame 9. The RFID antenna 1 is a transmitting / receiving antenna for sensing and communicating electromagnetic induction from an external device (hereinafter referred to as a reader / writer) (not shown).

情報端末機器本体２は、筐体６内に図示しないチップ状のＩＣモジュール等からなる回路部品、及び情報端末機器本体２に電源を供給するためのバッテリを収容（図３の回路部品７、バッテリ８参照）し、通信した情報や情報端末機器本体２の操作状況を表示するためのディスプレイ５を筐体６に備えて構成されている。   The information terminal device main body 2 accommodates a circuit component including a chip-shaped IC module (not shown) in the housing 6 and a battery for supplying power to the information terminal device main body 2 (the circuit component 7 in FIG. 8), and the housing 6 includes a display 5 for displaying the communicated information and the operation status of the information terminal device main body 2.

携帯型情報端末機器は、リーダライタの近傍に接近した時に、ＲＦＩＤアンテナ１を介してリーダライタとの非接触通信を行う機能を有している。情報端末機器本体２は、外部との通信情報をＲＦＩＤアンテナ１を介してリーダライタと遣り取りし、必要なデータを外部に送出したり、受信したデータを表示したり、送受信の通信制御をしたりする機能を有する。   The portable information terminal device has a function of performing non-contact communication with the reader / writer via the RFID antenna 1 when approaching the vicinity of the reader / writer. The information terminal device main body 2 exchanges external communication information with the reader / writer via the RFID antenna 1, sends necessary data to the outside, displays received data, and performs transmission / reception communication control. It has the function to do.

アンテナ枠９に収納されたＲＦＩＤアンテナ１は、ＲＦＩＤ機能を使用しない時は、図１（ａ）に示すように情報端末機器本体２に沿って２つに折り畳まれており、情報端末機器本体２の操作を妨げない構造となっている。   The RFID antenna 1 housed in the antenna frame 9 is folded into two along the information terminal device main body 2 as shown in FIG. 1A when the RFID function is not used. The structure does not hinder the operation.

すなわち、アンテナ枠９は、コイル状のＲＦＩＤアンテナ１を収納しており、中心部分は窓が開いた状態となっている。このため、携帯型情報端末機器は、アンテナ枠９を畳んだ図１（ａ）の状態でも、ディスプレイ５の表示が見える構造となっている。   That is, the antenna frame 9 houses the coiled RFID antenna 1, and the central portion is in a state where the window is open. For this reason, the portable information terminal device has a structure in which the display on the display 5 can be seen even in the state of FIG.

アンテナ枠９に収納されたＲＦＩＤアンテナ１は、ＲＦＩＤ機能を使用する時は、図１（ａ）の折り畳んだ状態から、図１（ｂ）に示すように連結箇所を軸として矢印方向に開かれる。   When using the RFID function, the RFID antenna 1 housed in the antenna frame 9 is opened from the folded state in FIG. 1A in the direction of the arrow as shown in FIG. .

このため、ＲＦＩＤアンテナ１の中心線は情報端末機器本体２から離れ、ＲＦＩＤアンテナ１が情報端末機器本体２に搭載されているＩＣモジュール等の電子部品（回路部品）やバッテリから離れる。   For this reason, the center line of the RFID antenna 1 is separated from the information terminal device body 2, and the RFID antenna 1 is separated from an electronic component (circuit component) such as an IC module mounted on the information terminal device body 2 and a battery.

したがって、情報端末機器は、アンテナ枠９のアンテナ開口部が筐体６内の回路部品及びバッテリを覆わないように位置することになる。   Therefore, the information terminal device is positioned so that the antenna opening of the antenna frame 9 does not cover the circuit components and the battery in the housing 6.

携帯電話等の情報機器端末の回路部品と異なり、ＲＦＩＤのための回路部品（ＩＣモジュール等）は、近距離の接触若しくは非接触（典型例として、数ミリメートルから数メートルの距離）通信に適するため、ＲＦＩＤのための回路部品は電磁的な干渉を受け易い。   Unlike circuit components of information equipment terminals such as mobile phones, RFID circuit components (IC modules, etc.) are suitable for short-range contact or non-contact (typically a distance of several millimeters to several meters). Circuit components for RFID are susceptible to electromagnetic interference.

このため、ＲＦＩＤ機能を有しない情報端末機器では生じない電磁干渉の影響が、ＲＦＩＤ機能を有する情報端末機器では生じ易く、この電磁干渉はＲＦＩＤアンテナ１と回路部品やバッテリが近接しているために発生するものである。特に、ＲＦＩＤアンテナ１の開口部が回路部品と近接し、ＲＦＩＤアンテナ１による電磁界の方向が回路部品の設けられた場所と一致する場合には、ＲＦＩＤのための回路部品は電磁的な影響を受け易い。   For this reason, the influence of electromagnetic interference that does not occur in an information terminal device that does not have an RFID function is likely to occur in an information terminal device that has an RFID function, and this electromagnetic interference is due to the proximity of the RFID antenna 1 and circuit components or batteries. It is what happens. In particular, when the opening of the RFID antenna 1 is close to the circuit component and the direction of the electromagnetic field by the RFID antenna 1 coincides with the place where the circuit component is provided, the circuit component for the RFID has an electromagnetic effect. Easy to receive.

したがって、本実施の形態に示すようにＲＦＩＤアンテナ１をこれらの回路部品やバッテリから離すことで、通信を行うための回路部品やバッテリがＲＦＩＤアンテナ１の開口部に覆われなくなり、情報端末機器本体２とＲＦＩＤアンテナ１との電磁的な干渉が低減、解消される優れた効果を発揮する。   Therefore, by separating the RFID antenna 1 from these circuit components and the battery as shown in the present embodiment, the circuit components and the battery for performing communication are not covered by the opening of the RFID antenna 1, and the information terminal device main body 2 and the RFID antenna 1 exhibit an excellent effect of reducing and eliminating electromagnetic interference.

図２は、本発明の他の実施の形態を示す。   FIG. 2 shows another embodiment of the present invention.

図２（ａ）は、携帯型情報端末機器用ＲＦＩＤアンテナを情報機器端末本体に収納させた状態を示す斜景図である。図２（ｂ）は、ＲＦＩＤアンテナをスライドさせた状態を示す斜景図である。   FIG. 2A is a perspective view showing a state in which the RFID antenna for portable information terminal equipment is housed in the information equipment terminal main body. FIG. 2B is a perspective view showing a state in which the RFID antenna is slid.

ＲＦＩＤ機能を有する携帯型情報端末機器は、ＲＦＩＤアンテナ１を内蔵したアンテナ枠９と、情報端末機器本体２と、アンテナ枠９を摺動自在にするためのスライド部４とを備えて構成される。   A portable information terminal device having an RFID function includes an antenna frame 9 incorporating an RFID antenna 1, an information terminal device main body 2, and a slide portion 4 for making the antenna frame 9 slidable. .

アンテナ枠９は、未使用時には情報端末機器本体２の筐体６に収納若しくは沿わせて配置されている。   The antenna frame 9 is accommodated in or arranged along the casing 6 of the information terminal device main body 2 when not used.

情報端末機器本体２の筐体６にはスライド部４が設けられており、スライド部４は、アンテナ枠９を支持し、必要に応じてアンテナ枠９を摺動するためのスライドレールの機能を有する。   The housing 6 of the information terminal device main body 2 is provided with a slide portion 4 that supports the antenna frame 9 and has a function of a slide rail for sliding the antenna frame 9 as necessary. Have.

アンテナ枠９と、情報端末機器本体２とは、ＲＦＩＤアンテナ１の使用時には情報端末機器本体２の長手方向にスライドさせてアンテナ枠９に収納されたＲＦＩＤアンテナ１を情報端末機器本体２から離れた状態にする構造となっている。   When the RFID antenna 1 is used, the antenna frame 9 and the information terminal device main body 2 are slid in the longitudinal direction of the information terminal device main body 2 so that the RFID antenna 1 housed in the antenna frame 9 is separated from the information terminal device main body 2. It has a structure to make a state.

このため、情報端末機器は、アンテナ枠９のアンテナ開口部が筐体６内の回路部品及びバッテリを覆わないように位置することになる。   For this reason, the information terminal device is positioned so that the antenna opening of the antenna frame 9 does not cover the circuit components and the battery in the housing 6.

情報端末機器本体２は、外部との通信情報をＲＦＩＤアンテナ１を介してリーダライタと遣り取りし、必要なデータを外部に送出したり、受信したデータを表示したり、送受信の通信制御をしたりする機能を有する。   The information terminal device main body 2 exchanges external communication information with the reader / writer via the RFID antenna 1, sends necessary data to the outside, displays received data, and performs transmission / reception communication control. It has the function to do.

アンテナ枠９に収納されたＲＦＩＤアンテナ１は、ＲＦＩＤ機能を使用しない時は、図２（ａ）に示すように情報端末機器本体２の筐体６に収納されるか、筐体６に沿っており、情報端末機器本体２の操作を妨げない構造となっている。   When the RFID function is not used, the RFID antenna 1 housed in the antenna frame 9 is housed in the housing 6 of the information terminal device body 2 or along the housing 6 as shown in FIG. Thus, the operation of the information terminal device main body 2 is not hindered.

すなわち、アンテナ枠９は、コイル状のＲＦＩＤアンテナ１を収納しており、中心部分は窓が開いた状態となっている。このため、携帯型情報端末機器は、アンテナ枠９を収納した図２（ａ）の状態でも、ディスプレイ５の表示がモニタ出来る構造となっている。   That is, the antenna frame 9 houses the coiled RFID antenna 1, and the central portion is in a state where the window is open. For this reason, the portable information terminal device has a structure in which the display on the display 5 can be monitored even in the state of FIG.

アンテナ枠９に収納されたＲＦＩＤアンテナ１は、ＲＦＩＤ機能を使用する時は、図２（ｂ）に示すようにスライド部４に沿って矢印方向に筐体６からスライド（移動）させアンテナ枠９を情報端末機器本体２から離す。   When using the RFID function, the RFID antenna 1 housed in the antenna frame 9 is slid (moved) from the housing 6 in the direction of the arrow along the slide portion 4 as shown in FIG. Is separated from the information terminal device body 2.

本実施の形態に示すようにＲＦＩＤアンテナ１を筐体６に収容された通信を行うための回路部品やバッテリから離すことで、回路部品やバッテリがＲＦＩＤアンテナ１の開口部に覆われなくなり、情報端末機器本体２とＲＦＩＤアンテナ１との電磁的な干渉が低減、解消される優れた効果を発揮する。   As shown in the present embodiment, by separating the RFID antenna 1 from the circuit component or battery for performing communication accommodated in the housing 6, the circuit component or battery is not covered by the opening of the RFID antenna 1. An excellent effect of reducing or eliminating electromagnetic interference between the terminal device body 2 and the RFID antenna 1 is exhibited.

以上説明したように本発明の実施の形態では、ＲＦＩＤ機能を有する携帯型情報端末において、ＲＦＩＤ機能使用時にＲＦＩＤアンテナが情報端末機器内の電子部品、バッテリから距離をとれるため、ＲＦＩＤ通信時において、ＲＦＩＤアンテナに対する周囲の電子部品や金属の影響による電磁的な干渉を低減させることが出来、その結果電磁的干渉に因る通信距離の減少や通信不能に陥ることがないという優れた効果を発揮する。   As described above, in the embodiment of the present invention, in the portable information terminal having the RFID function, the RFID antenna can take a distance from the electronic component and battery in the information terminal device when the RFID function is used. Electromagnetic interference due to the influence of surrounding electronic components and metal on the RFID antenna can be reduced, and as a result, the communication distance is not reduced due to electromagnetic interference, and the excellent effect of not causing communication failure is exhibited. .

図１（ａ）は、携帯型情報端末機器用ＲＦＩＤアンテナを折り畳んだ状態を示す斜景図である。図１（ｂ）は、ＲＦＩＤアンテナを開いた状態を示す斜景図である。FIG. 1A is a perspective view showing a state in which an RFID antenna for a portable information terminal device is folded. FIG. 1B is a perspective view showing a state where the RFID antenna is opened. 図２（ａ）は、携帯型情報端末機器用ＲＦＩＤアンテナを情報端末機器本体に収納させた状態を示す斜景図である。図２（ｂ）は、ＲＦＩＤアンテナをスライドさせた状態を示す斜景図である。FIG. 2A is a perspective view showing a state in which the RFID antenna for portable information terminal equipment is housed in the information terminal equipment body. FIG. 2B is a perspective view showing a state in which the RFID antenna is slid. 背景技術のＲＦＩＤ機能を有する携帯型情報端末機器の構造を示す概略図である。It is the schematic which shows the structure of the portable information terminal device which has the RFID function of background art.

符号の説明Explanation of symbols

１ ＲＦＩＤアンテナ
２ 情報端末機器本体
３ ヒンジ
４ スライド部
５ ディスプレイ
６ 筐体
９ アンテナ枠
DESCRIPTION OF SYMBOLS 1 RFID antenna 2 Information terminal device main body 3 Hinge 4 Slide part 5 Display 6 Case 9 Antenna frame

Claims (3)

ＲＦＩＤアンテナと、該ＲＦＩＤアンテナを介して通信を行う回路部品とを有する携帯型情報端末機器において、上記回路部品を筐体に収容し、この筐体に上記ＲＦＩＤアンテナを回動自在または、摺動自在に取り付けたことを特徴とする携帯型情報端末機器用ＲＦＩＤアンテナ。   In a portable information terminal device having an RFID antenna and a circuit component that communicates via the RFID antenna, the circuit component is housed in a housing, and the RFID antenna can be rotated or slid in the housing. An RFID antenna for portable information terminal equipment, which is freely attached. 上記ＲＦＩＤアンテナの一端と上記筐体の一端とを連結し、この連結箇所を軸として回動可能なヒンジを設けた請求項１記載の携帯型情報端末機器用ＲＦＩＤアンテナ。   The RFID antenna for a portable information terminal device according to claim 1, wherein one end of the RFID antenna and one end of the housing are connected, and a hinge that can be rotated about the connecting portion is provided. 上記ＲＦＩＤアンテナを上記筐体に沿わせて移動させるスライド部を設けた請求項１記載の携帯型情報端末機器用ＲＦＩＤアンテナ。
The RFID antenna for a portable information terminal device according to claim 1, further comprising a slide portion that moves the RFID antenna along the casing.
JP2003291467A 2003-08-11 2003-08-11 Rfid antenna for portable information terminal unit Pending JP2005064799A (en)

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