JP2005244778A - Miniaturized antenna and wireless tag provided with the same - Google Patents

Miniaturized antenna and wireless tag provided with the same Download PDF

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JP2005244778A
JP2005244778A JP2004054078A JP2004054078A JP2005244778A JP 2005244778 A JP2005244778 A JP 2005244778A JP 2004054078 A JP2004054078 A JP 2004054078A JP 2004054078 A JP2004054078 A JP 2004054078A JP 2005244778 A JP2005244778 A JP 2005244778A
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antenna
auxiliary
main
antenna element
tag
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JP4393228B2 (en
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Masatsune Terauchi
真恒 寺内
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Sharp Corp
シャープ株式会社
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<P>PROBLEM TO BE SOLVED: To facilitate impedance matching, while maintaining the gain. <P>SOLUTION: A miniaturized antenna AN comprises a pair of right and left antenna elements 1, 1 formed in both ends of a dielectric substrate 4, an auxiliary antenna element 2 formed between the pair of main antenna elements 1, 1, and matching sections 3, 3 connected to the main antenna elements 1, 1, and both ends of the auxiliary antenna element 2 are disposed proximately to the main antenna elements 1, 1, respectively, so that proximate portions between the main antenna elements 1, 1 and the auxiliary antenna element 2 become local proximate portions 7, 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、例えばRFID(Radio Frequency Identification)システムなどに用いられる小型アンテナ及び無線タグに関する。 The present invention relates to a small antenna and a radio tag is used, such as in an RFID (Radio Frequency Identification) system.

RFIDシステムは、例えば図12に示すように、リーダRW、アンテナA、無線タグTとから構成されており、リーダRWは電波信号を送出し、このリーダRWからの送出電波信号を無線タグTが受け、タグ内のメモリに蓄積された情報で、入力信号に反射変調を与えてリーダRWに返送する。 RFID systems, for example, as shown in FIG. 12, the reader RW, antennas A, which is composed of a RFID tag T, the reader RW sends out a radio signal, the transmission radio signal from the reader RW RFID tag T is receiving, at the information stored in the memory in the tag, it gives a reflection modulation on the input signal returns to the reader RW. そして、無線タグTから返送された信号をリーダRWにて復調してタグ情報を取り出すようになっている。 Then, so that the retrieving tag information by demodulating the return signal from the RFID tag T at the reader RW.

無線タグとしては、マイクロ波(2.4GHz帯)の周波数帯を使用したマイクロ波タグがFA分野等で利用されている。 The wireless tag, microwave tags uses a frequency band of the microwave (2.4GHz band) is utilized in the FA field and the like. マイクロ波タグにおいては、リーダからの送信電波を検波し、それを駆動電力としてタグ動作を行わせるバッテリレスタグが、多くの分野で様々な活用が検討されており、FAのほか、物流・流通関連などの分野で大きな活用展開が予定されている。 In microwave tag, it detects the radio wave transmitted from the reader, a battery-less tag that causes the tag operates it as a driving power, has been considered various use in many fields, in addition to the FA, logistics and distribution big leverage expansion in areas such as relevant is scheduled.

また、最近では、マイクロ波よりも伝播距離が長いUHF周波数帯(900MHz帯)を用いたRFIDシステムの規格化・法制化が進めらており、これに対応したUHF用タグの開発も進められてきている。 Recently, the propagation distance is long UHF frequency band than the microwave and standardization, legislation is promoted et al RFID system using a (900 MHz band), even been promoted development of UHF tag corresponding thereto ing.

UHF用のタグとしては、例えば、図13に示すように、誘電体基板203上に、信号を電波として送受信する直線状の主アンテナ素子201,201と補助アンテナ素子202を形成するとともに、タグ処理機能をもつタグIC204を組み込んで一体化したUHFダイポール型タグがある。 The tag for the UHF, for example, as shown in FIG. 13, on the dielectric substrate 203, thereby forming a linear main antenna 201, 201 for transmitting and receiving signals as radio waves auxiliary antenna element 202, the tag processing there are UHF dipole tag integrated incorporate tag IC204 with function.

しかしながら、UHFダイポール型タグでは、前記したようにマイクロ波タグに比べて伝播距離は長くなるものの、タグのサイズが大きくなるという問題がある。 However, the UHF dipole tag, although the propagation distance is longer than the microwave tag as described above, there is a problem that the size of the tag is increased. 例えば、マイクロ波ダイポール型タグは6〜8cm程度であるのに対し、UHFダイポール型タグでは16〜21cmであり、マイクロ波ダイポール型タグの約3倍の大きさになってしまう。 For example, the microwave dipole tag while is about 6~8Cm, the UHF dipole tag is 16~21Cm, becomes about three times the size of a microwave dipole tag.

このような問題を解消する方法として、ダイポールアンテナをメアンダライン形状(曲折形状)にすることで、アンテナの小型化をはかる方法が提案されている(例えば、特許文献1参照。)。 As a method for solving such a problem, by a dipole antenna meander line shape (bent shape), a method of measuring the size of the antenna has been proposed (e.g., see Patent Document 1.).

また、メアンダアンテナを有する無線タグとして、図14に示すように、誘電体基板303上にメアンダ形状の主アンテナ素子301、301と直線状の補助アンテナ素子302を形成するとともに、タグIC304を組み込んで一体化したものが知られている。 Further, as a wireless tag having a meander antenna, as shown in FIG. 14, to form a main antenna 301 and 301 and linear auxiliary antenna element 302 of meander shape on the dielectric substrate 303, incorporates a tag IC304 that integrated is known. この図14の構造では、主アンテナ素子301と補助アンテナ素子302との近接によって利得を高めている。 In the structure of FIG. 14, to enhance the gain by the proximity of the main antenna 301 and the auxiliary antenna element 302.
特開2002−141732号公報 JP 2002-141732 JP

ところで、図14に示した構造では、メアンダ形状の主アンテナ素子と同様に補助アンテナ素子がタグの両端(誘電体基板の両端)にまで延びており、アンテナ特性において最も重要なタグの両端エリアに補助アンテナが存在しているため、その両端エリアにおける主アンテナ素子の占有面積がどうしても小さくなり、利得が低下するという問題がある。 Incidentally, in the structure shown in FIG. 14, the main antenna as well as an auxiliary antenna elements of meander extends until both ends of the tag (both ends of the dielectric substrate), across the area of ​​the most important tags in the antenna characteristics since the auxiliary antenna is present, inevitably reduces the area occupied by the main antenna in both ends area, there is a problem that the gain is reduced.

また、主アンテナ素子と補助アンテナ素子との近接箇所が、補助アンテナ素子のほぼ全長にわたって数多く存在し(図15参照)、アンテナ素子部と整合部とが明確に分かれていないため、利得と整合とがトレードオフの関係になる。 Also, the proximity point between the main antenna and the auxiliary antenna elements, auxiliary antenna there are many over substantially the entire length of the element (see FIG. 15), since the antenna element portion and a matching portion is not clearly separated, gain and matching and but the relation of trade-off. このため、タグICとの整合と利得の双方を考慮して、主アンテナ素子及び補助アンテナ素子の双方のサイズや形状を工夫する必要があって、主アンテナ素子及び補助アンテナ素子の設計(アンテナインピーダンスの設計)の自由度が小さくなり、整合損失が大きくなるという問題がある。 Therefore, in consideration of both matching and gain of the tag IC, there is a need to devise both size and shape of the main antenna and auxiliary antenna elements, the design of the main antenna and auxiliary antenna elements (antenna impedance design) freedom is small, there is a problem that matching loss increases.

本発明はそのような実情に鑑みてなされたもので、利得を維持しつつ、インピーダンス整合を容易に行うことが可能な小型アンテナを提供すること、及び、そのような小型アンテナを備えた無線タグを提供することを目的とする。 The present invention has been made in view of such circumstances, while maintaining the gain, to provide a compact antenna capable of performing the impedance matching easily, and the wireless tag having such a small antenna an object of the present invention is to provide a.

本発明の小型アンテナは、誘電体基板の両端部に形成された左右一対の主アンテナ素子と、その一対の主アンテナ素子間に形成された補助アンテナ素子と、前記各主アンテナ素子に接続された整合部とを備えているとともに、前記補助アンテナ素子の両端部がそれぞれ前記各主アンテナ素子に近接していることによって特徴づけられる。 Small antenna of the present invention includes a main antenna element pair which is formed on both end portions of the dielectric substrate, and an auxiliary antenna element which is formed between the pair of main antenna elements, which are connected to the each main antenna together and a matching unit, characterized by the ends of the auxiliary antenna elements is in proximity to each of the respective main antenna.

本発明の小型アンテナによれば、補助アンテナ素子の両端部が各主アンテナ素子に近接する部分のみが、主アンテナ素子と補助アンテナ素子との局所的な近接部となり、その近接箇所がほぼ明確に分かれているので、アンテナインピーダンスの調整(主アンテナ素子と補助アンテナ素子との近接部に形成されるコンデンサの容量調整及び整合部の調整)を、主アンテナ素子のサイズ・形状に関係なく独立して行うことができる。 According to a small antenna of the present invention, the auxiliary only portions at both ends of the antenna elements adjacent to each main antenna element becomes the local proximity of the main antenna and the auxiliary antenna element, the proximity portion is substantially clear since known, the adjustment of the antenna impedance (capacitance adjustment and adjustment of the matching portion of the capacitor formed proximate portion between the main antenna element auxiliary antenna element), and independently regardless of the size and shape of the main antenna It can be carried out. 従って、主アンテナ素子を利得優先で自由に設計することが可能になる。 Thus, freely it is possible to design the main antenna in gain priority.

本発明の小型アンテナにおいて、主アンテナ素子、補助アンテナ素子及び整合部が前記誘電体基板の片面に形成されていることが好ましい。 In the small antenna of the present invention, it is preferable that the main antenna and auxiliary antenna elements and a matching portion is formed on one surface of the dielectric substrate. このように主アンテナ素子、補助アンテナ素子及び整合部を同一平面上に形成することにより、製作が容易になり生産コストの低減化を達成できる。 Thus the main antenna, by forming the auxiliary antenna element and the matching portion of the coplanar can achieve reduction in production costs easier manufacture. また、シート状の物体などに主アンテナ素子、補助アンテナ素子及び整合部の各導体線パターンを印刷により形成することも可能になる。 Further, like the main antenna sheet-like object, it becomes also possible to form by printing the conductor line patterns of the auxiliary antenna elements and a matching unit.

本発明の小型アンテナにおいて、小型化をはかるために、主アンテナ素子の導体線をメアンダライン状に形成することが好ましい。 In the small antenna of the present invention, in order to reduce the size, it is preferable to form the conductor lines of the main antenna to meander line shape. なお、主アンテナ素子は、折れ曲りパターンの導体線であってもよいし、略三角形状またはコイル状の導体線であってもよい。 The main antenna element, break may be a conductor line bent pattern may be substantially triangular or coiled conductor wire. また、整合部についても、メアンダライン状に形成された導体線またはコイル状の導体線とすることが好ましい。 As for the matching portion, it is preferable that the conductor line or coiled conductor lines formed in a meander line shape.

本発明の小型アンテナによれば、前記したように、主アンテナ素子を利得優先で自由に設計することが可能であるので、主アンテナ素子を、利得を高めることが可能な線幅の太い導体線(太い線幅のメアンダパターン)とすることが可能となる。 According to a small antenna of the present invention, as described above, the main since the antenna element can be freely designed by a gain priority to, the main antenna, a thick conductor wire line width that can increase the gain it is possible to (thick meander pattern having a line width).

本発明の小型アンテナにおいて、補助アンテナ素子を主アンテナ素子に対してスライド可能な構造としておけば、補助アンテナ素子の両端部が各主アンテナ電極に近接する近接部のギャップつまり整合調整用のコンデンサの容量を調整することができる。 In the small antenna of the present invention, the auxiliary antenna element if as a slidable structure with respect to the main antenna element, both ends of the auxiliary antenna element is a capacitor for a gap, i.e. matching adjustment of the near portion adjacent to the main antenna electrode it is possible to adjust the capacity. このような調整はタグ製作後に行うことが可能であり、例えば無線タグを装着する物体の材質によってタグインピーダンスが変化する場合の微調整に有効な手段となる。 Such adjustment is possible to perform after the tag fabrication, for example, an effective means for fine adjustment when the tag impedance changes depending on the material of the object attaching the wireless tag.

また、補助アンテナ素子のスライド移動により、補助アンテナ素子の両端部もしくは一端部を主アンテナ素子に接触させ、アンテナ特性を劣化させて無線タグの動作を停止することにより、例えば、セキュリティを確保することができる。 Further, aided by sliding movement of the antenna element, both ends or one end of the auxiliary antenna element is brought into contact with the main antenna, thereby deteriorating the antenna characteristics by stopping the operation of the wireless tag, for example, to ensure the security can. また、書籍購入済みの場合、書籍に貼付した無線タグの動作をOFFにし、未だ購入されていない書籍は無線タグの動作がONである、というような使用者の意図により無線タグの動作のON/OFFを自在にすることができる。 In addition, in the case of books purchased, the operation of the wireless tag that was attached to the book and to OFF, still books that have not been purchased ON operation of the radio tag by the intended operation of the radio tag is ON, the user, such as that / OFF to be able to freely.

本発明の小型アンテナにおいて、補助アンテナ素子の線幅もしくは長さを可変としておくと、補助アンテナ素子の両端部が各主アンテナ電極に近接する近接部のギャップつまり整合調整用のコンデンサの容量を調整することができる。 Adjust the small antenna of the present invention, the advance line width or length of the auxiliary antenna elements is variable, both end portions of the auxiliary antenna element the capacitance of the capacitor for the gap, that matching adjustment of the near portion adjacent to the main antenna electrode can do. また、補助アンテナ素子の線幅または長さを変更して、補助アンテナ素子を主アンテナ素子に接触させることで、アンテナ特性を劣化させて無線タグの動作を停止させることができる。 The auxiliary antenna by changing the line width or length of the element, the auxiliary antenna element is brought into contact with the main antenna, it is possible to stop the operation of the wireless tag to deteriorate the antenna characteristics. このように無線タグの動作を停止することにより、例えば、セキュリティを確保することができる。 By thus stopping the operation of the wireless tag, for example, it is possible to ensure security. また、書籍購入済みの場合、書籍に貼付した無線タグの動作をOFFにし、未だ購入されていない書籍は無線タグの動作がONである、というような使用者の意図により無線タグの動作のON/OFFを自在にすることができる。 In addition, in the case of books purchased, the operation of the wireless tag that was attached to the book and to OFF, still books that have not been purchased ON operation of the radio tag by the intended operation of the radio tag is ON, the user, such as that / OFF to be able to freely.

本発明の小型アンテナにおいて、補助アンテナ素子にスロットを形成しておき、そのスロットに別のタグICを実装するか、スロットに主アンテナ素子とは別の給電を行うようにすれば、スロットアンテナを形成することが可能となり、1つの小型アンテナで、例えばUHF(900MHz帯)とマイクロ波(2.4GHz帯)の2つの周波数に対応することが可能なデュアルアンテナを構成することが可能になる。 In the small antenna of the present invention, the auxiliary antenna element previously formed a slot, or to implement another tag IC in the slot, if to perform another feed than the main antenna into the slot, the slot antenna it is possible to form, in a single, compact antenna, for example UHF becomes possible to construct a dual antenna capable of corresponding to the two frequencies (900 MHz band) and a microwave (2.4GHz band).

本発明の小型アンテナにおいて、補助アンテナ素子の内側に別の電子部品を実装しておいてもよい。 In the small antenna of the present invention, it may have been implemented other electronic components inside the auxiliary antenna elements. また、補助アンテナ素子にスロットを形成して、そのスロットに別の電子部品を実装しておいてもよい。 Further, by forming a slot in the auxiliary antenna elements, it may be previously mounted another electronic component in the slot. スロットに実装する電子部品としては、例えば、PINダイオード等の半導体スイッチ、あるいはBluetooth等の他の通信デバイスなどを挙げることができる。 The electronic components to be mounted into the slot, for example, and the like semiconductor switches, or other communication devices such as Bluetooth, such as PIN diodes.

本発明の小型アンテナによれば、前記したように、主アンテナ素子と補助アンテナ素子との近接部に形成されるコンデンサの容量及び整合部の調整(インダクタ調整)を、主アンテナ素子のサイズ・形状に関係なく独立して行うことができるので、その整合部の電気長の変更により、主アンテナ素子の周波数(第1の周波数)とは異なる第2の周波数のアンテナを整合部で構成することができる。 According to a small antenna of the present invention, as described above, adjustment of the capacitance and the matching portion of the capacitor formed adjacent portion of the main antenna and the auxiliary antenna element (inductor adjustment), size of the main antenna element shape can be performed by independent no matter, it is composed of the antenna matching portion of the second frequency different by changing the electrical length of the matching section, and the frequency of the main antenna element (first frequency) it can. これにより、1つの小型アンテナで、例えばUHF(900MHz帯)とマイクロ波(2.4GHz帯)の2つの周波数に対応することが可能なデュアルアンテナを構成することができる。 This makes it possible to form a single compact antenna, for example, UHF dual antenna capable of corresponding to the two frequencies (900 MHz band) and a microwave (2.4GHz band). なお、整合部の変更によりアンテナインピーダンスがずれる場合、補助アンテナ素子の両端部が各主アンテナ素子に近接する近接部のギャップ、主アンテナ素子の導体線の線幅やメアンダ間隔などを調整して整合を行えばよい。 Incidentally, when the antenna impedance is shifted by changing the matching portion, the auxiliary gap of the proximity portion in which both ends of the antenna elements adjacent to each main antenna element, and adjusting the line width or meander spacing of the conductor lines of the main antenna matching the may be performed.

本発明の無線タグは、前記した特徴をもつ小型アンテナとICチップ(タグIC)とを備え、前記小型アンテナの整合部に前記ICチップが接続されているので、利得を維持しながらタグの小型化をはかることができるとともに、インピーダンスの整合を容易に行うことができる。 Wireless tag of the present invention is provided with a small antenna and an IC chip (tag IC) having said features, since the IC chip to the matching portion of the small antenna is connected, a small tag while maintaining the gain it is possible to achieve, it is possible to perform impedance matching easily.

ここで、前記した特許文献1(特開2002−141732号公報)に記載のアンテナでは、不平衡方式(GNDを基準として1本の信号線にGNDからの電位差を与える伝送方式)でアンテナに給電を行う構造であり、給電を行うグランド板はアンテナとしては動作しない。 Here, the above-the antenna described in Patent Document 1 (JP 2002-141732) has, antenna feed unbalanced manner (transmission system applying a potential difference from GND to one signal line relative to the GND) a structure for the ground plate for feeding power does not operate as an antenna. また、不平衡方式で給電が行なわれるため、マイクロストリップ等の平衡/不平衡の変換部が必要であり、その平衡/不平衡の変換部において電波が損失するという欠点がある。 Moreover, since the feed unbalanced method is performed, it is necessary to convert part of the balanced / unbalanced such as a micro strip, there is a drawback that radio waves is lost in the conversion of its equilibrium / non-equilibrium.

これに対し、本発明の無線タグ(小型アンテナ)は、ICタグの端子からアンテナ素子までを、完全に平衡伝送(2本の信号線を使ってそれぞれの線に電位差を与える伝送方法)とすること可能であり、補助アンテナ素子は給電されない構造とすることができる。 In contrast, the wireless tag of the present invention (small antenna) is from terminal of the IC tag to the antenna element, and completely balanced transmission (transmission method of giving a potential difference to each of the line using two signal lines) be possible, the auxiliary antenna element may be a not feed structure. 従って、補助アンテナ素子の中央部がアンテナとして動作して、僅かではあるものの、利得が向上するという利点がある。 Accordingly, the auxiliary center portion of the antenna element operates as an antenna, but just a certain, there is an advantage that the gain is improved. また、平衡伝送が可能な構造であることから、平衡/不平衡の変換部を設ける必要がない。 Further, since the balanced transmission has a structure capable of, it is not necessary to provide a conversion unit of the balanced / unbalanced.

本発明によれば、主アンテナ素子が誘電体基板の両端部(タグの両端部)に形成され、その主アンテナ素子間に補助アンテナ素子が形成されているとともに、前記補助アンテナ素子の両端部がそれぞれ各主アンテナ素子に近接する構造としているので、アンテナインピーダンスの調整(タグIC等との整合調整)を、主アンテナ素子のサイズ・形状に関係なく独立して行うことができる。 According to the present invention, the main antenna is formed on both end portions of the dielectric substrate (both end portions of the tag), along with its and auxiliary antenna elements between the main antenna element is formed, both ends of the auxiliary antenna element each since the structure adjacent to the main antenna, (matching adjustment with the tag IC and the like) adjusting the antenna impedance can be performed independently regardless of the size and shape of the main antenna. これにより、主アンテナ素子を利得優先で自由に設計することが可能となり、利得を向上させることができる。 Thus, freely it is possible to design the main antenna with a gain priority, it is possible to improve the gain. しかも、利得を維持しながらアンテナインピーダンスの調整を最適条件に設定することが可能となり、整合損失を少なくすることができる。 Moreover, it is possible to set the adjustment of the antenna impedance to the optimum conditions while maintaining the gain, it is possible to reduce the matching loss.

以下、本発明の実施形態を図面に基づいて説明する。 It will be described below with reference to embodiments of the present invention with reference to the drawings.
<実施形態1> <Embodiment 1>
図1は本発明の小型アンテナの一例を示す平面図である。 Figure 1 is a plan view showing an example of a small antenna of the present invention. 図2はそれぞれ図1のZa−Za線端面図(a)、Zb−Zb線端面図(b)及びZc−Zc線端面図(c)を併記して示す図である。 Figure 2 is a diagram showing an also shown Za-Za line end view, respectively, of FIG 1 (a), Zb-Zb line end view (b) and Zc-Zc line end view (c).

この例の小型アンテナANは、誘電体基板(例えばガラスエポキシ基板)4の片面に、左右一対の主アンテナ素子1,1と、補助アンテナ素子2と、左右一対の整合部3,3とが形成されてなる平面構造のアンテナである。 Small antenna AN in this example, on one surface of the dielectric substrate (e.g. glass epoxy substrate) 4, a pair of left and right main antenna 1, 1, an auxiliary antenna element 2, and the pair of the matching portion 3, 3 formed an antenna of a planar structure formed by.

主アンテナ素子1,1は、導体線がメアンダライン状に形成されたメアンダ型アンテナであって、誘電体基板4に左右対称に配置されている。 The main antenna element 1, 1, a conductor wire is a meander type antenna formed in a meander line shape and is symmetrically arranged on the dielectric substrate 4. 主アンテナ素子1,1は誘電体基板4の両端エリアを占有しており、これら左右一対の主アンテナ素子1,1間に補助アンテナ素子2が配置されている。 The main antenna element 1, 1 is occupying the ends areas of the dielectric substrate 4, the auxiliary antenna element 2 between the right and left pair of main antenna elements 1,1 are arranged.

補助アンテナ素子2の両端部はそれぞれ各主アンテナ素子1,1の内側端面11,12に近接した状態で配置されており、この近接部分が主アンテナ素子1,1と補助アンテナ素子2との近接部7,8となっている。 Proximity of the auxiliary opposite ends of the antenna element 2 are arranged in close proximity to the inner end surfaces 11 and 12 of the main antenna 1, 1, respectively, the near portion and the main antenna elements 1, 1 and the auxiliary antenna element 2 It has become a part 7, 8.

各整合部3,3はメアンダライン状に形成された導体線(インダクタ)である。 Each matching section 3, 3 are conductive lines formed in meander shape (inductor). 整合部3,3の各一端部はそれぞれ主アンテナ素子1,1の内側端部に接続されており、この整合部3,3の各他端部がタグIC等のICチップを搭載するIC搭載部5となっている。 Each respective one end of the matching portion 3,3 is connected to the inner end of the main antenna 1, 1, IC mounting each other end of the matching section 3, 3 for mounting the IC chip, such as the tag IC It has become a part 5.

そして、このような小型アンテナANの整合部3,3の他端部のIC搭載部5に、図3に示すようにタグIC6を実装することにより、小型の無線タグT0を実現することができる。 Then, the IC mounting portion 5 of the other end of the matching portion 3,3 of such a small antenna AN, by implementing the tag IC6 as shown in FIG. 3, it is possible to reduce the size of the wireless tag T0 .

この例の小型アンテナAN及び無線タグT0によれば、主アンテナ素子1,1の導体線の線幅が太くて、誘電体基板4の両端エリアを主アンテナ素子1,1が完全に占有しているので、図14に示した従来の構造と比べて利得を高めることができる。 According to the small antenna AN and the wireless tag T0 in this example, the main line width of the conductor lines of the antenna elements 1, 1 is thick, the ends areas of the dielectric substrate 4 by the main antenna 1, 1 are fully occupied because there, it is possible to increase the gain as compared with the conventional structure shown in FIG. 14.

また、各主アンテナ素子1,1と補助アンテナ素子2との近接箇所が、その補助アンテナ素子2の両端部の近接部7,8のみであり、図4の等価回路に示すように、主アンテナ素子1,1との補助アンテナ素子2との近接箇所がほぼ明確に分かれており、しかも、補助アンテナ素子2が各主アンテナ素子1,1に近接する近接部7,8に形成されるコンデンサC及び整合部3によるインダクタLの双方が可変であるので、それらコンデンサC及びインダクタLの調整つまりアンテナインピーダンスの調整(タグIC等との整合調整)を主アンテナ素子1,1のサイズ・形状に関係なく独立して行うことができる。 Also, the proximity points between the main antenna 1, 1 and the auxiliary antenna element 2, only the proximal part 7, 8 of both end portions of the auxiliary antenna element 2, as shown in the equivalent circuit of FIG. 4, the main antenna is divided almost clear proximity point between the auxiliary antenna element 2 of the element 1, 1, moreover, the capacitor C of the auxiliary antenna element 2 is formed in the proximal part 7, 8 adjacent to each main antenna elements 1, 1 and because both the inductor L by the matching unit 3 is variable, adjustment ie adjustment of the antenna impedance thereof capacitor C and an inductor L (matching adjustment with the tag IC and the like) related to the size and shape of the main antenna 1, 1 it can be carried out independently without.

従って、主アンテナ素子1,1を利得優先で自由に設計することが可能になる。 Thus, freely it is possible to design the main antenna 1, 1 a gain priority. しかも高い利得を維持しつつ、アンテナインピーダンスの調整を最適条件に設定することが可能となり、整合損失を少なくすることができる。 Moreover, while maintaining a high gain, it is possible to set the optimum adjustment of the antenna impedance, it is possible to reduce the matching loss.

さらに、この例の小型アンテナAN及び無線タグT0によれば、前記したように、整合部3の調整を主アンテナ素子のサイズ・形状に関係なく独立して行うことができるので、その整合部3の電気長の変更により、主アンテナ素子の周波数(第1の周波数)とは異なる第2の周波数のアンテナを整合部3で構成することができる。 Furthermore, according to the small antenna AN and the wireless tag T0 in this embodiment, as described above, it can be performed independently regardless of the size and shape of the main antenna to adjust the matching unit 3, the matching unit 3 of changes in electrical length, it may be composed of different second matching portion 3 of the antenna of the frequency from the frequency of the main antenna (first frequency). これにより、1つの小型アンテナANで、例えばUHF(900MHz帯)とマイクロ波(2.4GHz帯)の2つの周波数に対応することが可能なデュアルアンテナを構成することができる。 This makes it possible to form a single small antenna AN, for example UHF dual antenna capable of corresponding to the two frequencies (900 MHz band) and a microwave (2.4GHz band). なお、整合部3の変更によりアンテナインピーダンスがずれる場合、補助アンテナ素子2の両端部が各主アンテナ素子1,1に近接する近接部のギャップ7,8、主アンテナ素子1の導体線の線幅やメアンダ間隔などを調整して整合を行えばよい。 Incidentally, when the antenna impedance is shifted by changing the matching section 3, an auxiliary antenna element proximate portion of the gap 7, 8 having both ends adjacent to each main antenna elements 1, 1 2, the line width of the main antenna element 1 of the conductor wires and the like or meander interval may be performed to adjust to integrity.

<実施形態2> <Embodiment 2>
以上の例では、補助アンテナ素子2を誘電体基板4に固定配置としているが、図5に示すように、補助アンテナ素子2をY方向にスライド可能な構造としておけば、補助アンテナ素子2の両端部が主アンテナ電極1,1に近接する近接部8のギャップつまり整合調整用のコンデンサの容量を調整することができる。 In the above example, although the auxiliary antenna element 2 is fixed arranged on the dielectric substrate 4, as shown in FIG. 5, the auxiliary antenna element 2 if as a slidable structure in the Y direction, both ends of the auxiliary antenna element 2 part can adjust the capacitance of the capacitor for the gap, that matching adjustment of the near portion 8 close to the main antenna electrodes 1,1. このような調整は、製作後に行うことが可能であり、例えば、無線タグを装着する物体の材質によって、タグインピーダンスが変化する場合の微調整に有効な手段となる。 Such adjustments, it is possible to perform after fabrication, for example, depending on the material of the object attaching the wireless tag, it is an effective means for fine adjustment when the tag impedance changes.

また、補助アンテナ素子2のY方向へのスライド移動により、補助アンテナ素子2の両端部を一対の主アンテナ素子1,1に接触させ、アンテナ特性を劣化させて無線タグT1の動作を停止することにより、セキュリティを確保するというような使用方法も可能になる。 Further, the sliding movement of the Y-direction of the auxiliary antenna element 2, the auxiliary both ends of the antenna element 2 is brought into contact with the pair of main antenna elements 1,1, to deteriorate the antenna characteristics to stop the operation of the RFID tags T1 makes it possible usage as of ensuring security. また、書籍購入済みの場合、書籍に貼付した無線タグの動作をOFFにし、未だ購入されていない書籍は無線タグの動作がONである、というような使用者の意図により無線タグの動作のON/OFFを自在にすることができる。 In addition, in the case of books purchased, the operation of the wireless tag that was attached to the book and to OFF, still books that have not been purchased ON operation of the radio tag by the intended operation of the radio tag is ON, the user, such as that / OFF to be able to freely.

なお、補助アンテナ素子2をX方向にスライド可能な構造としてもよく、この場合も、補助アンテナ素子2の一端部を主アンテナ素子1に接触させることで、アンテナ特性を劣化させて無線タグの動作を停止させることができる。 The auxiliary antenna element 2 may be a slidable structure in the X-direction, also in this case, the auxiliary one end of the antenna element 2 is brought into contact with the main antenna 1, the operation of the radio tag to deteriorate the antenna characteristics the can be stopped.

補助アンテナ素子2のスライド構造の具体的な例としては、例えば、補助アンテナ素子2を個別の金属プレートで構成するとともに、誘電体基板4またはタグケース(図示せず)にスライド案内用のガイド溝を設け、そのガイド溝に沿って補助アンテナ素子2をスライドさせるという構造を挙げることができる。 Auxiliary Specific examples of the sliding structure of the antenna element 2, for example, the auxiliary antenna element 2 as well as composed of individual metal plates, the guide groove of the slide guide in the dielectric substrate 4 or tag case (not shown) the provided include a structure that slides the auxiliary antenna element 2 along the guide groove.

また、補助アンテナ素子2に関しては、その導体線の線幅または長さを変更することが可能な構造としておいてもよい。 As for the auxiliary antenna element 2, it may have been a possible structure to change the line width or length of the conductor lines. 補助アンテナ素子2の線幅を可変としておくと、上記したスライド構造と同様に、補助アンテナ素子2の両端部が主アンテナ電極1,1に近接する近接部8のギャップつまり整合調整用のコンデンサの容量を調整することができる。 When the line width of the auxiliary antenna elements 2 keep the variable, as in the slide structure described above, the capacitor for the gap, that matching adjustment of the near portion 8 both end portions of the auxiliary antenna element 2 is close to the main antenna electrodes 1,1 it is possible to adjust the capacity. さらに、補助アンテナ素子2の線幅または長さを変更して、補助アンテナ素子2を主アンテナ素子1に接触させることで、アンテナ特性を劣化させて無線タグの動作を停止させることができる。 Further, the auxiliary line width of the antenna element 2 or by changing the length, the auxiliary antenna element 2 is brought into contact with the main antenna 1, it is possible to stop the operation of the wireless tag to deteriorate the antenna characteristics.

補助アンテナ素子2の線幅または長さを可変とする構造の具体的な例としては、例えば、補助アンテナ素子2を、誘電体基板上に形成した固定導体線パターンと、この固定導体線パターンに重ね合わせた可動金属プレートによって構成し、その可動金属プレートを固体導体線パターンに対してスライドさせることにより、線幅または長さを変えるという構造を挙げることができる。 Specific examples of the structure of a line width or length of the auxiliary antenna element 2 is variable, for example, an auxiliary antenna element 2, and the stationary conductor line pattern formed on a dielectric substrate, in the stationary conductor line pattern constituted by superposing the movable metal plate was, the movable metal plate by sliding with respect to the solid conductor wire pattern include a structure of changing the line width or length.

<実施形態3> <Embodiment 3>
図6及び図7はそれぞれ本発明の無線タグ(小型アンテナ)の他の例を示す平面図である。 6 and 7 are plan views showing another example of a radio tag (small antenna) of the present invention, respectively.

図6に示すように、補助アンテナ素子2にスロット21を形成し、このスロット21にスイッチ(例えばPINダイオード等の半導体スイッチ)22を実装しておき、そのスイッチ22をタグIC6の両端間に接続しておいてもよい。 As shown in FIG. 6, the auxiliary antenna element 2 to form a slot 21, this slot 21 Leave implement 22 (semiconductor switches, such as, for example, a PIN diode) switch, connects the switch 22 across the tag IC6 it may have been. このような構成を採用すれば、スイッチ22がOFFの状態では無線タグT2が通常の状態で動作し、スイッチ22をONにすることにより、タグIC6の両端をショートさせて無線タグT2の動作を止めることができる。 By adopting such a configuration, operates the wireless tag T2 is in a normal state the switch 22 is in the state OFF, the by the switch 22 to ON, the by shorting both ends of the tag IC6 operation of the wireless tag T2 it can be stopped. このようにスイッチ22を設けて無線タグT2の動作を止めることにより、例えば、セキュリティを確保することができる。 By stopping the operation of the wireless tag T2 by this way a switch 22, for example, it is possible to ensure security. また、書籍購入済みの場合、書籍に貼付した無線タグの動作をOFFにし、未だ購入されていない書籍は無線タグの動作がONである、というような使用者の意図により無線タグの動作のON/OFFを自在にすることができる。 In addition, in the case of books purchased, the operation of the wireless tag that was attached to the book and to OFF, still books that have not been purchased ON operation of the radio tag by the intended operation of the radio tag is ON, the user, such as that / OFF to be able to freely.

また、図7に示すように、補助アンテナ素子2にスロット21を形成し、そのスロット21に別のタグIC23を実装すれば、1つの製品に2つの無線タグを構成することが可能となり、1つの無線タグT3を、例えばUHF(900MHz帯)とマイクロ波(2.4GHz帯)の2つの周波数に対応することが可能なタグとして使用することができる。 Further, as shown in FIG. 7, the auxiliary antenna element 2 to form a slot 21 or implementing another tag IC23 in the slot 21, it is possible to configure two of the wireless tag in a single product, 1 one of the radio tag T3, for example, UHF (900 MHz band) and can be used as a tag that can correspond to the two frequencies of the microwave (2.4GHz band).

なお、補助アンテナに形成したスロットに給電を行うようにすれば、スロットアンテナを形成することが可能となり、1つの小型アンテナで、例えば、UHF(900MHz帯)とマイクロ波(2.4GHz帯)の2つの周波数に対応することが可能なデュアルアンテナを構成することが可能になる。 Incidentally, if to perform feeding to the slot formed in the auxiliary antenna, it is possible to form a slot antenna, a single small antenna, for example, UHF of (900 MHz band) and a microwave (2.4GHz band) correspond to the two frequencies it is possible to configure a dual antenna capable.

また、補助アンテナ素子の内側に別の電子部品を実装しておいてもよい。 It may also be allowed to implement a different electronic component inside the auxiliary antenna elements. さらに、補助アンテナ素子にスロットアンテナを形成して、そのスロットアンテナにBluetooth等の他の通信デバイスなど実装しておいてもよい。 Furthermore, the auxiliary antenna element to form a slot antenna, may have been implemented, such as other communication devices such as Bluetooth to the slot antenna.

<実施形態4> <Embodiment 4>
図1及び図3の例では、主アンテナ素子1をメアンダライン形状のパターンとしているが、これに限られることなく、例えば、図8に示すような折り曲げパターンの主アンテナ素子101としてもよい。 In the example of FIGS. 1 and 3, although the main antenna 1 and the pattern of the meander line shape, without being limited thereto, for example, may be a main antenna 101 such folded pattern as shown in FIG. また、図9に示すように、主アンテナ素子111を、誘電体基板4の端部に向かうに従って線幅が漸次大きくなるような略三角形状のパターンとしてもよい。 Further, as shown in FIG. 9, the main antenna 111, the line width may be substantially triangular pattern as gradually increases toward the end portion of the dielectric substrate 4. さらに、主アンテナ素子は、誘電体基板4にスルーホールを形成し、そのスルーホールを利用してコイル状に巻回した形状のヘリカルアンテナであってもよい。 Furthermore, the main antenna element, a through hole is formed in the dielectric substrate 4, it may be a helical antenna having a shape wound in a coil shape by utilizing the through hole.

<実施形態5> <Embodiment 5>
本発明において整合部の電気長を後調整する場合の例を図10及び図11に示す。 An example in which the rear adjusting the electrical length of the matching section in the present invention shown in FIGS. 10 and 11.

図10の例は、整合部31を「ロの字」が連続するパターンとし(図10(a))、その「ロ路の字」の一辺もしくは複数の辺をレーザ光の照射等により切断することにより(図10(b))、整合部31の電気長を調整する方法である。 Example of FIG. 10, the matching section 31 and a pattern "hollow square" continues (FIG. 10 (a)), is cut by irradiation or the like of the "B path shaped" laser beam one side or multiple sides of (FIG. 10 (b)) by a method of adjusting the electrical length of the matching section 31.

図11の例は、整合部32を、矩形部33を有するパターンとし(図11(a))、その矩形部33の一部分をレーザ光の照射等により除去することにより(図11(a))、整合部32の電気長を調整する方法である。 Example of FIG. 11, the matching unit 32, a pattern having a rectangular section 33 (FIG. 11 (a)), is removed by irradiation or the like of a laser beam a portion of the rectangular portion 33 (FIG. 11 (a)) a method of adjusting the electrical length of the matching section 32. なお、図11の例では、矩形部33の除去部の切り込み深さを適宜設定することにより、整合部32の電気長を無段階で調整することができる。 Incidentally, in the example of FIG. 11, by setting the removal of the cutting depth of the rectangular portion 33 appropriately, it is possible to adjust the electrical length of the matching portion 32 steplessly.

本発明は、FA・物流・流通などの各種分野においてRFIDシステムを構築する際に有効に利用できる。 The present invention can be effectively used in constructing the RFID system in various fields such as FA · logistics and distribution.

本発明の小型アンテナの一例を示す平面図である。 Is a plan view showing an example of a small antenna of the present invention. 図1のZa−Za線端面図(a)、Zb−Zb線端面図(b)、及び、Zc−Zc線端面図である。 Za-Za line end view of FIG. 1 (a), Zb-Zb line end view (b), and a Zc-Zc line end view. 図1の小型アンテナを使用した無線タグの一例を示す図である。 Is a diagram illustrating an example of a wireless tag using a small antenna of FIG. 図3の無線タグの等価回路図である。 It is an equivalent circuit diagram of the wireless tag of FIG. 本発明の無線タグの他の例を示す平面図である。 It is a plan view showing another example of the wireless tag of the present invention. 本発明の無線タグの別の例を示す平面図である。 Another example of the wireless tag of the present invention is a plan view showing. 本発明の無線タグの別の例を示す平面図である。 Another example of the wireless tag of the present invention is a plan view showing. 本発明の無線タグの別の例を示す平面図である。 Another example of the wireless tag of the present invention is a plan view showing. 本発明の無線タグの別の例を示す平面図である。 Another example of the wireless tag of the present invention is a plan view showing. 整合部の長さを調整する方法の一例の説明図である。 Is an illustration of an example of a method of adjusting the length of the matching section. 整合部の長さを調整する方法の他の例の説明図である。 It is an explanatory view of another example of a method of adjusting the length of the matching section. RFIDシステムの基本構成を示す図である。 It is a diagram showing a basic configuration of the RFID system. 従来の無線タグの一例を示す平面図である。 Is a plan view showing an example of a conventional wireless tag. 従来の無線タグの他の例を示す平面図である。 It is a plan view showing another example of a conventional wireless tag. 図14の無線タグの等価回路図である。 It is an equivalent circuit diagram of the wireless tag of FIG. 14.

符号の説明 DESCRIPTION OF SYMBOLS

AN 小型アンテナ T0 無線タグ 1 主アンテナ素子 2 補助アンテナ素子 3 整合部 4 誘電体基板 5 IC搭載部 6 タグIC AN small antenna T0 wireless tag 1 main antenna element 2 auxiliary antenna element 3 matching unit 4 the dielectric substrate 5 IC mounting portion 6 tag IC
7,8 近接部 21 スロット 22 スイッチ 23 タグIC 7,8 proximity portions 21 slot 22 the switch 23 tag IC

Claims (9)

  1. 誘電体基板の両端部に形成された左右一対の主アンテナ素子と、その一対の主アンテナ素子間に形成された補助アンテナ素子と、前記各主アンテナ素子に接続された整合部とを備えているとともに、前記補助アンテナ素子の両端部がそれぞれ前記各主アンテナ素子に近接していることを特徴とする小型アンテナ。 Includes a pair of main antenna elements formed in both end portions of the dielectric substrate, and an auxiliary antenna element which is formed between the pair of main antenna elements, and said matching section connected to the main antenna together with a small antenna, characterized in that both ends of the auxiliary antenna elements is in proximity to each of the respective main antenna.
  2. 前記主アンテナ素子、補助アンテナ素子及び整合部が前記誘電体基板の片面に形成されていることを特徴とする請求項1記載の小型アンテナ。 The main antenna elements, auxiliary antenna elements and small antenna according to claim 1, wherein the matching unit is characterized in that it is formed on one surface of the dielectric substrate.
  3. 前記主アンテナ素子は、導体線がメアンダライン状に形成されていることを特徴とする請求項1または2記載の小型アンテナ。 The main antenna element, according to claim 1 or 2, wherein the small antenna, characterized in that the conductor lines are formed in a meander line shape.
  4. 前記主アンテナが利得を優先した線幅の太い導体線で構成されていることを特徴とする請求項1〜3のいずれかに記載の小型アンテナ。 Small antenna according to claim 1, characterized in that it is constituted by a thick conductor wire line width of the main antenna has priority to gain.
  5. 前記補助アンテナ素子は、前記主アンテナ素子に対してスライド可能であることを特徴とする請求項1〜4のいずれかに記載の小型アンテナ。 It said auxiliary antenna element is a small antenna according to any one of claims 1 to 4, characterized in that with respect to the main antenna element is slidable.
  6. 前記補助アンテナ素子は、導体線の線幅もしくは長さが可変であることを特徴とする請求項1〜4のいずれかに記載の小型アンテナ。 It said auxiliary antenna element is a small antenna according to claim 1, wherein the line width or the length of the conductor lines is variable.
  7. 前記補助アンテナ素子にスロットが形成されており、そのスロットに別の部品が実装されていることを特徴とする請求項1〜6のいずれかに記載の小型アンテナ。 The auxiliary antenna and the slot is formed in the device, a small antenna according to any one of claims 1 to 6, characterized in that different components are mounted in that slot.
  8. 前記主アンテナ素子の周波数とは異なる他の周波数のアンテナが前記整合部で構成されていることを特徴とする請求項1〜7のいずれかに記載の小型アンテナ。 Small antenna according to any one of claims 1 to 7, characterized in that different other frequency of the antenna to the frequency of the main antenna element is configured by the matching unit.
  9. 請求項1〜8のいずれかに記載の小型アンテナとICチップを備え、前記小型アンテナの整合部に前記ICチップが接続されていることを特徴とする無線タグ。 Comprising a small antenna and an IC chip according to claim 1, a wireless tag, wherein the IC chip to the matching portion of the small antenna is connected.

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