JP3148168U - Wireless IC device - Google Patents

Wireless IC device Download PDF

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JP3148168U
JP3148168U JP2008007398U JP2008007398U JP3148168U JP 3148168 U JP3148168 U JP 3148168U JP 2008007398 U JP2008007398 U JP 2008007398U JP 2008007398 U JP2008007398 U JP 2008007398U JP 3148168 U JP3148168 U JP 3148168U
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wireless
annular electrode
radiation plate
radiation
chip
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加藤 登
登 加藤
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Murata Manufacturing Co Ltd
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Abstract

【課題】無線ICの実装精度を緩和でき、放射特性を向上させるとともに、近距離での通信にも使用できる無線ICデバイスを得る。【解決手段】無線ICチップ5と、一対の端部26a,26bを有する環状電極25と、給電回路を内蔵した給電回路基板10と、環状電極25の電流最大点である接続部27に接続された放射板15とを備えた無線ICデバイス。無線ICチップ5は給電回路と結合し、環状電極25と放射板とは一部で電磁界結合している。放射板15は電界用放射板として遠距離通信に用いられ、環状電極25は磁界用放射板として近距離通信に用いられる。給電回路基板10を省略し、無線ICチップ5を環状電極25に整合部を介して結合させてもよい。【選択図】図4A wireless IC device that can reduce mounting accuracy of a wireless IC, improve radiation characteristics, and can also be used for communication at a short distance. A wireless IC chip, an annular electrode having a pair of end portions a and b, a feeder circuit board having a built-in feeder circuit, and a connecting portion that is the maximum current point of the annular electrode are connected. A wireless IC device comprising a radiation plate 15. The wireless IC chip 5 is coupled to a power feeding circuit, and the annular electrode 25 and the radiation plate are partially electromagnetically coupled. The radiation plate 15 is used for long-distance communication as a radiation plate for electric field, and the annular electrode 25 is used for short-range communication as a radiation plate for magnetic field. The power supply circuit board 10 may be omitted, and the wireless IC chip 5 may be coupled to the annular electrode 25 via a matching portion. [Selection] Figure 4

Description

本考案は、無線ICデバイス、特に、RFID(Radio Frequency Identification)システムに用いられる無線ICデバイスに関する。   The present invention relates to a wireless IC device, and more particularly to a wireless IC device used in an RFID (Radio Frequency Identification) system.

従来、物品の管理システムとして、誘導電磁界を発生するリーダライタと物品や容器などに付された所定の情報を記憶したICチップ(ICタグ、無線ICチップとも称する)とを非接触方式で通信し、情報を伝達するRFIDシステムが開発されている。ICチップはアンテナ、即ち、放射板と接続されることによりリーダライタとの通信が可能になる。   Conventionally, as an article management system, a reader / writer that generates an induction electromagnetic field and an IC chip (also referred to as an IC tag or a wireless IC chip) that stores predetermined information attached to an article or a container are communicated in a non-contact manner. RFID systems that transmit information have been developed. The IC chip can be communicated with a reader / writer by being connected to an antenna, that is, a radiation plate.

ICチップを搭載するためのタグアンテナとしては、従来、特許文献1に記載されているものが知られている。このタグアンテナは、給電部とダイポールアンテナとインダクタンス部とを備え、給電部はダイポールアンテナの中心点に配置されている。しかしながら、このタグアンテナでは、給電部の配置がダイポールアンテナの中心点に限定されるため、給電部に配置されるICチップの実装精度が低下すると、無線タグとしての性能が低下するという問題点を有していた。また、リーダライタとの通信は電界を利用するダイポールアンテナのみを使用して行うため、近距離のみの通信には適さなかった。
特開2006−295879号公報
As a tag antenna for mounting an IC chip, one described in Patent Document 1 is conventionally known. The tag antenna includes a power feeding unit, a dipole antenna, and an inductance unit, and the power feeding unit is disposed at the center point of the dipole antenna. However, in this tag antenna, since the arrangement of the power feeding unit is limited to the center point of the dipole antenna, if the mounting accuracy of the IC chip arranged in the power feeding unit is lowered, the performance as a wireless tag is lowered. Had. In addition, since communication with a reader / writer is performed using only a dipole antenna that uses an electric field, it is not suitable for short-distance communication.
JP 2006-295879 A

そこで、本考案の目的は、無線ICの実装精度を緩和でき、放射特性を向上させるとともに、近距離での通信にも使用できる無線ICデバイスを提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless IC device that can reduce the mounting accuracy of a wireless IC, improve radiation characteristics, and can be used for short-distance communication.

本考案の第1の形態である無線ICデバイスは、
無線ICと、
少なくとも一対の端部を有する環状電極と、
前記環状電極の一対の端部に設けられた整合部と、
前記環状電極の電流最大点に接続されたダイポール型の放射板と、
を備え、
前記無線ICは前記整合部と結合し、
前記環状電極と前記放射板とは少なくとも一部で電磁界結合していること、
を特徴とする。
The wireless IC device according to the first aspect of the present invention is
A wireless IC;
An annular electrode having at least a pair of ends;
A matching portion provided at a pair of ends of the annular electrode;
A dipole-shaped radiation plate connected to the current maximum point of the annular electrode;
With
The wireless IC is coupled to the matching unit,
The annular electrode and the radiation plate are electromagnetically coupled at least in part;
It is characterized by.

本考案の第2の形態である無線ICデバイスは、
無線ICと、
少なくとも一対の端部を有する環状電極と、
インダクタンス素子を含んで所定の共振周波数を有する共振回路及び/又は整合回路からなる給電回路と、
前記環状電極の電流最大点に接続されたダイポール型の放射板と、
を備え、
前記無線ICは前記給電回路と結合し、
前記環状電極と前記放射板とは少なくとも一部で電磁界結合していること、
を特徴とする。
The wireless IC device according to the second aspect of the present invention is
A wireless IC;
An annular electrode having at least a pair of ends;
A power feeding circuit including a resonance circuit and / or a matching circuit including an inductance element and having a predetermined resonance frequency;
A dipole-shaped radiation plate connected to the current maximum point of the annular electrode;
With
The wireless IC is coupled with the power feeding circuit,
The annular electrode and the radiation plate are electromagnetically coupled at least in part;
It is characterized by.

第1の形態である無線ICデバイスにおいては、無線ICは環状電極の一対の端部に設けられた整合部に結合されるため、無線ICの整合部への実装精度はそれほど厳密なものではない。また、第2の形態である無線ICデバイスにおいては、無線ICは給電回路に結合されるため、無線ICの給電回路への実装密度はそれほど厳密なものではない。   In the wireless IC device according to the first embodiment, since the wireless IC is coupled to the matching portion provided at the pair of ends of the annular electrode, the mounting accuracy of the wireless IC on the matching portion is not so strict. . Further, in the wireless IC device according to the second embodiment, since the wireless IC is coupled to the power feeding circuit, the mounting density of the wireless IC on the power feeding circuit is not so strict.

第1及び第2の形態である無線ICデバイスにおいては、環状電極とダイポール型の放射板との結合度が高く、放射特性が向上する。ダイポール型の放射板は電界を利用して遠距離での通信が可能であり、環状電極は磁界を利用して近距離での通信が可能である。   In the wireless IC devices according to the first and second embodiments, the degree of coupling between the annular electrode and the dipole radiation plate is high, and the radiation characteristics are improved. The dipole-type radiation plate can communicate over a long distance using an electric field, and the annular electrode can communicate over a short distance using a magnetic field.

第2の形態である無線ICデバイスにおいては、所定の共振周波数を有する共振回路及び/又は整合回路からなる給電回路により、リーダライタとの通信に使用する信号の周波数を実質的に決定している。この給電回路を、使用する無線ICや放射板のインピーダンスに合わせて設計することにより、種々のインピーダンスに対応することができ、インピーダンス整合可能な周波数帯域を広くすることができる。また、給電回路とダイポール型の放射板とに結合するように環状電極を配置しているので、環状電極から放射板へ伝達される信号の損失を小さくすることができ、信号の放射特性が向上する。   In the wireless IC device according to the second embodiment, the frequency of a signal used for communication with the reader / writer is substantially determined by a power supply circuit including a resonance circuit and / or a matching circuit having a predetermined resonance frequency. . By designing this power supply circuit in accordance with the impedance of the wireless IC or radiation plate to be used, it is possible to cope with various impedances and to widen the frequency band in which impedance matching is possible. In addition, since the annular electrode is arranged so as to be coupled to the feed circuit and the dipole radiation plate, the loss of the signal transmitted from the annular electrode to the radiation plate can be reduced, and the signal radiation characteristics are improved. To do.

さらに、インピーダンスの整合を給電回路で行えば、磁界用放射板として機能する環状電極はインピーダンスのマッチングとは関係なく比較的自由に設計できるので、磁束が交差する面積を広く取ることができる。その結果、小さなエネルギーでリーダライタと近距離での通信が可能になる。   Furthermore, if impedance matching is performed by a power feeding circuit, the annular electrode functioning as a magnetic field radiation plate can be designed relatively freely regardless of impedance matching, so that the area where magnetic flux intersects can be widened. As a result, it is possible to communicate with a reader / writer at a short distance with small energy.

また、第1の形態である無線ICデバイスのように、給電回路を省略し、無線ICを整合部を介して環状電極と結合させ、該環状電極に共振回路機能を持たせてもよい。   Further, like the wireless IC device according to the first embodiment, the power feeding circuit may be omitted, and the wireless IC may be coupled to the annular electrode via the matching unit, and the annular electrode may have a resonance circuit function.

本考案によれば、無線ICの実装精度が緩和され、環状電極を備えたことにより所望の放射特性を広帯域に得ることができる。また、環状電極によって近距離での通信が可能となり、ダイポール型の放射板による遠距離での通信と併用することにより、近距離及び遠距離での通信を使い分けることができる。環状電極はインピーダンスのマッチングとは関係なく磁束が交差する面積を広く取ることができるので、小さなエネルギーでリーダライタと近距離での通信が可能になる。   According to the present invention, the mounting accuracy of the wireless IC is relaxed, and a desired radiation characteristic can be obtained in a wide band by providing the annular electrode. In addition, the short-distance communication is possible by the annular electrode, and the short-distance and long-distance communication can be properly used by using together with the long-distance communication by the dipole type radiation plate. Since the annular electrode can take a wide area where the magnetic flux intersects regardless of impedance matching, communication with the reader / writer at a short distance is possible with small energy.

以下、本考案に係る無線ICデバイスの実施例について添付図面を参照して説明する。なお、各図において、共通する部品、部分には同じ符号を付し、重複する説明は省略する。   Embodiments of a wireless IC device according to the present invention will be described below with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to a common component and part, and the overlapping description is abbreviate | omitted.

(第1実施例、図1及び図2参照)
図1及び図2に本考案の第1実施例である無線ICデバイス1Aを示す。この無線ICデバイス1Aは、所定周波数の送受信信号を処理する無線ICチップ5と、PETフィルムなどの基材20上に形成した放射板15と環状電極25にて構成されている。
(Refer to the first embodiment, FIGS. 1 and 2)
1 and 2 show a wireless IC device 1A according to a first embodiment of the present invention. The wireless IC device 1A includes a wireless IC chip 5 that processes transmission / reception signals of a predetermined frequency, a radiation plate 15 formed on a base material 20 such as a PET film, and an annular electrode 25.

環状電極25は一対の端部26a,26bが幅広に形成されており、この幅広な端部26a,26bに無線ICチップ5が搭載されている。無線ICチップ5は、クロック回路、ロジック回路、メモリ回路などを含み、必要な情報がメモリされており、裏面に図示しない一対の入出力端子電極及び一対の実装用端子電極が設けられている。そして、一対の入出力端子電極が環状電極25の一対の端部26a,26b上に、図2に示すように、導電性接合剤6を介して実装される。   The annular electrode 25 has a wide pair of end portions 26a and 26b, and the wireless IC chip 5 is mounted on the wide end portions 26a and 26b. The wireless IC chip 5 includes a clock circuit, a logic circuit, a memory circuit, and the like. Necessary information is stored, and a pair of input / output terminal electrodes and a pair of mounting terminal electrodes (not shown) are provided on the back surface. Then, the pair of input / output terminal electrodes are mounted on the pair of end portions 26a, 26b of the annular electrode 25 through the conductive bonding agent 6 as shown in FIG.

放射板15は、環状電極25の両側に延在するように配置され、いわゆるダイポール型の形状とされている。環状電極25の一部は放射板15と接続部27を介して電気的に導通するように接続されている。放射板15は、環状電極25を含めてアルミ箔、銅箔などの導電材からなる金属薄板を基材20上に貼着してパターニングしたり、あるいは、基材20上にAl、Cu、Agなどの導電性ペーストを塗布したり、めっき処理により設けた膜をパターニングすることにより形成されている。   The radiation plate 15 is disposed so as to extend on both sides of the annular electrode 25 and has a so-called dipole shape. A part of the annular electrode 25 is connected to the radiation plate 15 via the connection portion 27 so as to be electrically connected. The radiating plate 15 is formed by pasting and patterning a thin metal plate made of a conductive material such as an aluminum foil and a copper foil including the annular electrode 25 on the base material 20, or Al, Cu, Ag on the base material 20. It forms by apply | coating conductive pastes, such as, or patterning the film | membrane provided by the plating process.

環状電極25は、端部26aから端部26bまでの所定の長さを有し、この電気長に相当する所定の共振周波数を有し、かつ、位相を整合させる整合部としても機能する。また、放射板15も同様にその電気長に相当する所定の共振周波数を有している。さらに、環状電極25は、無線ICチップ5のインピーダンス(通常50Ω)と放射板15のインピーダンス(空間のインピーダンス377Ω)とのマッチングを図っている。   The annular electrode 25 has a predetermined length from the end portion 26a to the end portion 26b, has a predetermined resonance frequency corresponding to this electrical length, and also functions as a matching portion that matches the phase. Similarly, the radiation plate 15 has a predetermined resonance frequency corresponding to its electrical length. Further, the annular electrode 25 matches the impedance of the wireless IC chip 5 (usually 50Ω) and the impedance of the radiation plate 15 (space impedance 377Ω).

従って、無線ICチップ5から発信された所定の周波数を有する送信信号は環状電極25を介して放射板15に伝達し、かつ、放射板15で受信した信号は環状電極25で所定の周波数を有する信号が選択され、無線ICチップ5に供給される。それゆえ、この無線ICデバイス1Aは、放射板15で受信した信号によって無線ICチップ5が動作され、該無線ICチップ5からの応答信号が放射板15から外部に放射される。   Therefore, a transmission signal having a predetermined frequency transmitted from the wireless IC chip 5 is transmitted to the radiation plate 15 via the annular electrode 25, and a signal received by the radiation plate 15 has a predetermined frequency at the annular electrode 25. A signal is selected and supplied to the wireless IC chip 5. Therefore, in this wireless IC device 1A, the wireless IC chip 5 is operated by the signal received by the radiation plate 15, and the response signal from the wireless IC chip 5 is radiated from the radiation plate 15 to the outside.

前述のように、環状電極25と放射板15とは、接続部27を介して電気的に導通するように接続されている。より望ましくは、環状電極25に流れる電流及び放射板15に流れる電流が最大となる点を接続部とする。電流最大点は電流により発生する磁界の強さも最大になるので、信号の伝達効率も最大になる。これにより、無線ICチップ5から送信された信号は、環状電極25内を伝播し、直接放射板15に伝達され、両者の電流が最大となる点を接続点とすることにより両者の結合をより強くすることができ、信号の伝達効率を向上させることができる。より具体的には、環状電極25における電流最大点は長手方向の中央部であり、接続部27はこの中央部に設けられている。放射板15における電流最大点は長手方向の中央部であり、接続部27はこの中央部に設けられている。   As described above, the annular electrode 25 and the radiation plate 15 are connected via the connection portion 27 so as to be electrically connected. More preferably, the point where the current flowing through the annular electrode 25 and the current flowing through the radiation plate 15 are maximized is defined as the connection portion. Since the current maximum point also maximizes the strength of the magnetic field generated by the current, the signal transmission efficiency is also maximized. As a result, the signal transmitted from the wireless IC chip 5 propagates through the annular electrode 25 and is directly transmitted to the radiation plate 15, and the connection between the two is further increased by setting the point where the currents of the two are maximum. The signal transmission efficiency can be improved. More specifically, the maximum current point in the annular electrode 25 is the central portion in the longitudinal direction, and the connecting portion 27 is provided in this central portion. The maximum point of current in the radiation plate 15 is the central portion in the longitudinal direction, and the connecting portion 27 is provided in this central portion.

接続部27における環状電極25と放射板15との結合度は、接続部27における幅W及び間隔Lが影響する。幅W及び間隔Lが大きくなると結合度は小さくなる。   The degree of coupling between the annular electrode 25 and the radiation plate 15 in the connection portion 27 is affected by the width W and the interval L in the connection portion 27. As the width W and the interval L increase, the degree of coupling decreases.

環状電極25からは、その信号の一部が無線ICデバイス1Aの外部に磁界として放射され、かつ、放射板15からも信号が外部に電界として放射される。このとき、環状電極25の共振周波数を放射板15の共振周波数よりも低い周波数になるように設計することにより、無線ICデバイスとしての放射特性を広帯域化することができる。   A part of the signal is emitted from the annular electrode 25 to the outside of the wireless IC device 1A as a magnetic field, and the signal is also emitted from the radiation plate 15 to the outside as an electric field. At this time, by designing the resonance frequency of the annular electrode 25 to be lower than the resonance frequency of the radiation plate 15, it is possible to broaden the radiation characteristics of the wireless IC device.

また、環状電極25の3辺と放射板15とは近接しており、この近接部分で副次的な電磁界結合が発生し、環状電極25と放射板15との結合をさらに強くすることができ、無線ICデバイスの放射利得の向上や放射特性のさらなる広帯域化を図ることができる。   Further, the three sides of the annular electrode 25 and the radiation plate 15 are close to each other, and secondary electromagnetic field coupling is generated in this proximity portion, thereby further strengthening the coupling between the annular electrode 25 and the radiation plate 15. In addition, it is possible to improve the radiation gain of the wireless IC device and further widen the radiation characteristics.

なお、環状電極25の一対の端部26a,26bは、本第1実施例においてはダイポール型の放射板15との接続部27から最も離れた位置に配置しているが、端部26a,26bをダイポール型の放射板15に近接して配置しても構わない。   The pair of end portions 26a and 26b of the annular electrode 25 are arranged at positions farthest from the connection portion 27 with the dipole-type radiation plate 15 in the first embodiment, but the end portions 26a and 26b. May be arranged close to the dipole radiation plate 15.

また、環状電極25は本第1実施例のように矩形状ではなく、楕円形状など種々の形状であってもよい。この点は以下に説明する他の実施例においても同様である。   Further, the annular electrode 25 may have various shapes such as an elliptical shape instead of a rectangular shape as in the first embodiment. This also applies to other embodiments described below.

以上のように、無線ICデバイス1Aにあっては、環状電極25で信号の共振周波数を設定するため、無線ICデバイス1Aを種々の物品に取り付けてもそのままで動作し、放射特性の変動が抑制され、個別の物品ごとに放射板15などの設計変更をする必要がなくなる。そして、放射板15から放射する送信信号の周波数及び無線ICチップ5に供給する受信信号の周波数は、環状電極25の共振周波数に実質的に相当する。環状電極25において送受信信号の周波数が決まるため、放射板15の形状やサイズ、配置関係などによらず、例えば、無線ICデバイス1Aを丸めたり、誘電体で挟んだりしても、周波数特性が変化することなく、安定した周波数特性が得られる。   As described above, in the wireless IC device 1A, since the resonance frequency of the signal is set by the annular electrode 25, the wireless IC device 1A operates as it is even when the wireless IC device 1A is attached to various articles, and fluctuations in radiation characteristics are suppressed. Thus, it is not necessary to change the design of the radiation plate 15 or the like for each individual article. The frequency of the transmission signal radiated from the radiation plate 15 and the frequency of the reception signal supplied to the wireless IC chip 5 substantially correspond to the resonance frequency of the annular electrode 25. Since the frequency of the transmitted / received signal is determined in the annular electrode 25, the frequency characteristics change even if the wireless IC device 1A is rounded or sandwiched between dielectrics, for example, regardless of the shape, size, arrangement relationship, etc. of the radiation plate 15 Stable frequency characteristics can be obtained without doing so.

(整合部の構成、図3参照)
前記第1実施例において、無線ICチップ5と結合する整合部は、図3(A)〜(D)に示すように、環状電極25の一対の端部26a,26bに様々な構成で配置することができる。
(Configuration of matching unit, see FIG. 3)
In the first embodiment, as shown in FIGS. 3A to 3D, the matching portion coupled to the wireless IC chip 5 is arranged in various configurations on the pair of end portions 26a and 26b of the annular electrode 25. be able to.

図3(A)は、端部26a,26bを接続するライン状の整合部38aを環状線路として形成したものを示す。図3(B)は、端部26a,26bを接続するライン状の整合部38bを蛇行線路として形成したものを示す。図3(C)は、端部26a,26bにそれぞれライン状の整合部38cを蛇行線路として形成したものを示す。図3(D)は、端部26a,26bにそれぞれライン状の整合部38dを螺旋線路として形成したものを示す。   FIG. 3A shows a line-shaped matching portion 38a connecting the end portions 26a and 26b formed as an annular line. FIG. 3B shows a line-shaped matching portion 38b connecting end portions 26a and 26b formed as a meandering line. FIG. 3C shows a configuration in which line-like matching portions 38c are formed as meandering lines at the end portions 26a and 26b, respectively. FIG. 3D shows a configuration in which line-shaped matching portions 38d are formed as spiral lines at the end portions 26a and 26b, respectively.

(第2実施例、図4〜図8参照)
図4に本考案の第2実施例である無線ICデバイス1Bを示す。この無線ICデバイス1Bは、電磁結合モジュール2と、PETフィルムなどの基材20上に形成した放射板15と、環状電極25とで構成されている。電磁結合モジュール2は、所定周波数の送受信信号を処理する無線ICチップ5と、該無線ICチップ5を搭載した給電回路基板10とからなる。
(Refer 2nd Example and FIGS. 4-8)
FIG. 4 shows a wireless IC device 1B according to a second embodiment of the present invention. The wireless IC device 1B includes an electromagnetic coupling module 2, a radiation plate 15 formed on a base material 20 such as a PET film, and an annular electrode 25. The electromagnetic coupling module 2 includes a wireless IC chip 5 that processes a transmission / reception signal having a predetermined frequency, and a power supply circuit board 10 on which the wireless IC chip 5 is mounted.

なお、図4(A)は電磁結合モジュール2を搭載した状態での無線ICデバイス1Bを示し、図4(B)は電磁結合モジュール2を搭載していない状態での放射板15と環状電極25を示している。図4(C)は放射板15と環状電極25との接続部27の変形例を示している。   4A shows the wireless IC device 1B in a state where the electromagnetic coupling module 2 is mounted, and FIG. 4B shows the radiation plate 15 and the annular electrode 25 in a state where the electromagnetic coupling module 2 is not mounted. Is shown. FIG. 4C shows a modification of the connection portion 27 between the radiation plate 15 and the annular electrode 25.

放射板15及び環状電極25は、基本的には前記第1実施例と同様であり、環状電極25の端部26a,26bに電磁結合モジュール2が搭載されている。   The radiation plate 15 and the annular electrode 25 are basically the same as those in the first embodiment, and the electromagnetic coupling module 2 is mounted on the end portions 26 a and 26 b of the annular electrode 25.

給電回路基板10は、図5に等価回路として示すように、互いに異なるインダクタンス値を有し、かつ、互いに逆相で磁気結合(相互インダクタンスMで示す)されているインダクタンス素子L1,L2を含む共振回路・整合回路を有する給電回路11(詳細は図8を参照して以下に説明する)を備えている。   As shown in FIG. 5 as an equivalent circuit, the feeder circuit board 10 includes resonance elements L1 and L2 having inductance values different from each other and magnetically coupled in opposite phases to each other (indicated by a mutual inductance M). A power supply circuit 11 having a circuit / matching circuit (details will be described below with reference to FIG. 8) is provided.

無線ICチップ5は、図6に示すように、入出力端子電極が給電回路基板10上に形成した給電端子電極42a,42bに、実装用端子電極は実装電極43a,43bに金属バンプなどを介して電気的に接続されている。   As shown in FIG. 6, in the wireless IC chip 5, input / output terminal electrodes are connected to power supply terminal electrodes 42a and 42b formed on the power supply circuit board 10, and mounting terminal electrodes are connected to mounting electrodes 43a and 43b via metal bumps or the like. Are electrically connected.

給電回路11に含まれるインダクタンス素子L1,L2は逆相で磁気結合して無線ICチップ5が処理する周波数に共振し、かつ、環状電極25の端部26a,26bと電磁界結合している。また、給電回路11は無線ICチップ5のインピーダンス(通常50Ω)と放射板15のインピーダンス(空間のインピーダンス377Ω)とのマッチングを図っている。   The inductance elements L1 and L2 included in the power feeding circuit 11 are magnetically coupled in opposite phases to resonate at a frequency processed by the wireless IC chip 5, and are electromagnetically coupled to the end portions 26a and 26b of the annular electrode 25. The power feeding circuit 11 matches the impedance of the wireless IC chip 5 (usually 50Ω) and the impedance of the radiation plate 15 (space impedance 377Ω).

従って、給電回路11は、無線ICチップ5から発信された所定の周波数を有する送信信号を環状電極25を介して放射板15に伝達し、かつ、放射板15で受信して環状電極25を経由した信号から所定の周波数を有する受信信号を選択し、無線ICチップ5に供給する。それゆえ、この無線ICデバイス1Bは、放射板15で受信した信号によって無線ICチップ5が動作され、該無線ICチップ5からの応答信号が放射板15から外部に放射される。   Accordingly, the power feeding circuit 11 transmits a transmission signal having a predetermined frequency transmitted from the wireless IC chip 5 to the radiation plate 15 via the annular electrode 25, and receives the transmission signal via the annular electrode 25 via the annular electrode 25. A received signal having a predetermined frequency is selected from the obtained signals and supplied to the wireless IC chip 5. Therefore, in the wireless IC device 1B, the wireless IC chip 5 is operated by the signal received by the radiation plate 15, and the response signal from the wireless IC chip 5 is emitted from the radiation plate 15 to the outside.

また、環状電極25は、端部26aから端部26bまでの所定の長さを有し、この電気長に相当する所定の共振周波数を有している。また、放射板15も同様にその電気長に相当する所定の共振周波数を有している。環状電極25の共振周波数をf1、放射板15の共振周波数をf2としたとき、f1がf2よりも低い共振周波数となるように設計する。即ち、環状電極25と放射板15とをそれぞれ単体でみたとき、環状電極25の電気長を放射板15の電気長と同じかそれより長く設計する。さらに、環状電極25と放射板15とは、接続部27を介して電気的に導通するように接続されている。より望ましくは、環状電極25に流れる電流及び放射板15に流れる電流が最大となる点を接続部とする。これにより、電磁結合モジュール2から送信された信号は、環状電極25内を伝播し、直接放射板15に伝達され、両者の電流が最大となる点を接続点とすることにより両者の結合をより強くすることができ、信号の伝達効率を向上させることができる。   The annular electrode 25 has a predetermined length from the end 26a to the end 26b, and has a predetermined resonance frequency corresponding to this electrical length. Similarly, the radiation plate 15 has a predetermined resonance frequency corresponding to its electrical length. When the resonance frequency of the annular electrode 25 is f1, and the resonance frequency of the radiation plate 15 is f2, the design is made so that f1 is a resonance frequency lower than f2. That is, when the annular electrode 25 and the radiation plate 15 are viewed as a single unit, the electrical length of the annular electrode 25 is designed to be equal to or longer than the electrical length of the radiation plate 15. Furthermore, the annular electrode 25 and the radiation plate 15 are connected so as to be electrically connected via the connection portion 27. More preferably, the point where the current flowing through the annular electrode 25 and the current flowing through the radiation plate 15 are maximized is defined as the connection portion. As a result, the signal transmitted from the electromagnetic coupling module 2 propagates in the annular electrode 25 and is directly transmitted to the radiation plate 15, and the connection between the two is further increased by setting the point where the currents of the two are maximum. The signal transmission efficiency can be improved.

そして、環状電極25からは、その信号の一部が無線ICデバイス1Bの外部に磁界として放射され、かつ、放射板15からも信号が外部に電界として放射される。このとき、環状電極25の共振周波数f1を放射板15の共振周波数f2よりも低い周波数になるように設計することにより、無線ICデバイスとしての放射特性を広帯域化することができる。このように環状電極25は、放射板に信号を伝達する機能を有するとともに、信号の一部を外部に放射する機能も有している。   A part of the signal is emitted from the annular electrode 25 to the outside of the wireless IC device 1B as a magnetic field, and the signal is also emitted from the radiation plate 15 to the outside as an electric field. At this time, by designing the resonance frequency f1 of the annular electrode 25 to be lower than the resonance frequency f2 of the radiation plate 15, the radiation characteristic as a wireless IC device can be widened. Thus, the annular electrode 25 has a function of transmitting a signal to the radiation plate and also has a function of radiating a part of the signal to the outside.

図7は第2実施例である無線ICデバイス1Bの放射利得の周波数特性を示している。図7から明らかなように、環状電極25と放射板15とが結合している状態での環状電極25による共振周波数と、放射板15による共振周波数との間の周波数帯域100MHzという広帯域にわたって1.5dB以上の高い放射利得が得られていることが分かる。なお、図7におけるマーカ1とマーカ2は、それぞれUHF帯のRFIDの上限と下限の使用周波数を示している。   FIG. 7 shows the frequency characteristics of the radiation gain of the wireless IC device 1B according to the second embodiment. As is clear from FIG. 7, the frequency band 1... Over a wide band of 100 MHz between the resonance frequency by the annular electrode 25 and the resonance frequency by the radiation plate 15 in a state where the annular electrode 25 and the radiation plate 15 are coupled. It can be seen that a high radiation gain of 5 dB or more is obtained. In addition, the marker 1 and the marker 2 in FIG. 7 have shown the use frequency of the upper limit and lower limit of RFID of a UHF band, respectively.

さらに、無線ICデバイス1Bが送受信する信号の周波数をf0としたとき、f0がマーカ1の周波数f1'とマーカ2の周波数f2'との間になるように設定することにより、所定の信号周波数f0において十分な放射利得を得ることができる。また、環状電極25及び放射板15の製造上のばらつきにより周波数f1',f2'が多少変動したとしても、二つの周波数f1',f2'間では無線ICデバイスとして問題なく動作させることができるため、無線ICデバイスとしての信頼性が向上する。   Furthermore, when the frequency of the signal transmitted and received by the wireless IC device 1B is f0, the predetermined signal frequency f0 is set by setting f0 to be between the frequency f1 ′ of the marker 1 and the frequency f2 ′ of the marker 2. A sufficient radiation gain can be obtained. In addition, even if the frequencies f1 ′ and f2 ′ fluctuate slightly due to manufacturing variations of the annular electrode 25 and the radiation plate 15, the wireless IC device can be operated without any problem between the two frequencies f1 ′ and f2 ′. Reliability as a wireless IC device is improved.

ところで、環状電極25と放射板15とは接続部27を介して接続されているため、環状電極25と放射板15とが結合することにより放射板15の共振周波数f2が単体での設計値よりも低くなる。このため、環状電極25の単体での共振周波数f1は、放射板15の共振周波数f2よりも低くなるように設計することが好ましい。それにより、無線ICデバイス1Bに前記周波数f1',f2'の帯域内において十分な放射特性を持たせることができる。また、環状電極25の単体での共振周波数f1は、給電回路11の有する共振回路の共振周波数よりも高く設計することが好ましい。前述のように、環状電極25が放射板15と結合することにより環状電極25の共振周波数f1が低くなる。そのため、環状電極25の単体での共振周波数f1を共振回路の共振周波数f0よりも高く設計しておくことにより、無線ICデバイス1Bが動作している際、つまり、環状電極25と放射板15とが結合している状態では、共振周波数f0を前記周波数f1',f2'の帯域内に設定することができ、高い放射利得を有した状態で安定した通信を行うことができる。なお、放射板15の共振周波数f2は、信号の波長λに対して、λ/2未満であることが好ましい。   By the way, since the annular electrode 25 and the radiation plate 15 are connected via the connecting portion 27, the annular electrode 25 and the radiation plate 15 are combined, so that the resonance frequency f2 of the radiation plate 15 is higher than the design value of the single body. Also lower. For this reason, it is preferable to design the resonance frequency f1 of the annular electrode 25 alone so as to be lower than the resonance frequency f2 of the radiation plate 15. As a result, the wireless IC device 1B can have sufficient radiation characteristics within the bands of the frequencies f1 ′ and f2 ′. Further, it is preferable that the resonance frequency f1 of the annular electrode 25 alone is designed to be higher than the resonance frequency of the resonance circuit included in the power feeding circuit 11. As described above, when the annular electrode 25 is coupled to the radiation plate 15, the resonance frequency f1 of the annular electrode 25 is lowered. Therefore, by designing the resonance frequency f1 of the annular electrode 25 alone to be higher than the resonance frequency f0 of the resonance circuit, when the wireless IC device 1B is operating, that is, the annular electrode 25 and the radiation plate 15 Can be set within the bands of the frequencies f1 ′ and f2 ′, and stable communication can be performed with a high radiation gain. The resonance frequency f2 of the radiation plate 15 is preferably less than λ / 2 with respect to the signal wavelength λ.

以上のように、無線ICデバイス1Bにあっては、給電回路基板10に設けた給電回路11で信号の共振周波数を設定するため、無線ICデバイス1Bを種々の物品に取り付けてもそのままで動作し、放射特性の変動が抑制され、個別の物品ごとに放射板15などの設計変更をする必要がなくなる。そして、放射板15から放射する送信信号の周波数及び無線ICチップ5に供給する受信信号の周波数は、給電回路基板10における給電回路11の共振周波数に実質的に相当する。給電回路基板10において送受信信号の周波数が決まるため、放射板15及び環状電極25の形状やサイズ、配置関係などによらず、例えば、無線ICデバイス1Bを丸めたり、誘電体で挟んだりしても、周波数特性が変化することなく、安定した周波数特性が得られる。   As described above, the wireless IC device 1B operates as it is even when the wireless IC device 1B is attached to various articles because the resonance frequency of the signal is set by the power supply circuit 11 provided on the power supply circuit board 10. The fluctuation of the radiation characteristic is suppressed, and it is not necessary to change the design of the radiation plate 15 or the like for each individual article. The frequency of the transmission signal radiated from the radiation plate 15 and the frequency of the reception signal supplied to the wireless IC chip 5 substantially correspond to the resonance frequency of the power feeding circuit 11 in the power feeding circuit board 10. Since the frequency of the transmission / reception signal is determined in the power supply circuit board 10, for example, the wireless IC device 1 </ b> B may be rounded or sandwiched by a dielectric regardless of the shape, size, arrangement relationship, etc. of the radiation plate 15 and the annular electrode 25. A stable frequency characteristic can be obtained without changing the frequency characteristic.

接続部27における環状電極25と放射板15との結合度は、接続部27における幅W及び間隔L(図4(B)参照)が影響する。幅W及び間隔Lが大きくなると結合度は小さくなる。   The coupling degree between the annular electrode 25 and the radiation plate 15 in the connection portion 27 is affected by the width W and the interval L (see FIG. 4B) in the connection portion 27. As the width W and the interval L increase, the degree of coupling decreases.

また、接続部27は、図4(C)に示すように、2箇所で分岐していてもよい。この場合、幅W'が大きくなると結合度は大きくなり、間隔L'が大きくなると結合度は小さくなる。   Moreover, the connection part 27 may be branched in two places, as shown in FIG.4 (C). In this case, the degree of coupling increases as the width W ′ increases, and the degree of coupling decreases as the interval L ′ increases.

ここで、給電回路基板10の構成について図8を参照して説明する。給電回路基板10は、誘電体あるいは磁性体からなるセラミックシート41a〜41hを積層、圧着、焼成したものである。最上層のシート41aには、給電端子電極42a,42b、実装電極43a,43b、ビアホール導体44a,44b,45a,45bが形成されている。2層目〜8層目のシート41b〜41hには、それぞれ、インダクタンス素子L1,L2を構成する配線電極46a,46bが形成され、必要に応じてビアホール導体47a,47b,48a,48bが形成されている。   Here, the configuration of the feeder circuit board 10 will be described with reference to FIG. The feeder circuit board 10 is obtained by laminating, pressing and firing ceramic sheets 41a to 41h made of a dielectric or magnetic material. On the uppermost sheet 41a, power supply terminal electrodes 42a and 42b, mounting electrodes 43a and 43b, and via-hole conductors 44a, 44b, 45a and 45b are formed. In the second to eighth sheets 41b to 41h, wiring electrodes 46a and 46b constituting the inductance elements L1 and L2 are formed, and via hole conductors 47a, 47b, 48a and 48b are formed as necessary. ing.

以上のシート41a〜41hを積層することにより、配線電極46aがビアホール導体47aにて螺旋状に接続されたインダクタンス素子L1が形成され、配線電極46bがビアホール導体47bにて螺旋状に接続されたインダクタンス素子L2が形成される。また、配線電極46a,46bの線間にキャパシタンスが形成される。   By laminating the above sheets 41a to 41h, the inductance element L1 in which the wiring electrode 46a is spirally connected by the via-hole conductor 47a is formed, and the inductance in which the wiring electrode 46b is spirally connected by the via-hole conductor 47b. Element L2 is formed. Further, a capacitance is formed between the wiring electrodes 46a and 46b.

シート41b上の配線電極46aの端部46a−1はビアホール導体45aを介して給電端子電極42aに接続され、シート41h上の配線電極46aの端部46a−2はビアホール導体48a,45bを介して給電端子電極42bに接続される。シート41b上の配線電極46bの端部46b−1はビアホール導体44bを介して給電端子電極42bに接続され、シート41h上の配線電極46bの端部46b−2はビアホール導体48b,44aを介して給電端子電極42aに接続される。   The end 46a-1 of the wiring electrode 46a on the sheet 41b is connected to the power supply terminal electrode 42a via the via hole conductor 45a, and the end 46a-2 of the wiring electrode 46a on the sheet 41h is connected via the via hole conductors 48a and 45b. Connected to the power supply terminal electrode 42b. The end 46b-1 of the wiring electrode 46b on the sheet 41b is connected to the power supply terminal electrode 42b via the via hole conductor 44b, and the end 46b-2 of the wiring electrode 46b on the sheet 41h is connected via the via hole conductors 48b and 44a. Connected to the power supply terminal electrode 42a.

以上の給電回路11において、インダクタンス素子L1,L2はそれぞれ逆方向に巻かれているため、インダクタンス素子L1,L2で発生する磁界が相殺される。磁界が相殺されるため、所望のインダクタンス値を得るためには配線電極46a,46bをある程度長くする必要がある。これにてQ値が低くなるので共振特性の急峻性がなくなり、共振周波数付近で広帯域化することになる。   In the above power feeding circuit 11, since the inductance elements L1 and L2 are wound in opposite directions, the magnetic fields generated by the inductance elements L1 and L2 are canceled out. Since the magnetic field cancels out, it is necessary to lengthen the wiring electrodes 46a and 46b to some extent in order to obtain a desired inductance value. As a result, the Q value is lowered, so that the steepness of the resonance characteristics is lost, and the bandwidth is increased in the vicinity of the resonance frequency.

インダクタンス素子L1,L2は、給電回路基板10を平面透視したときに、左右の異なる位置に形成されている。また、インダクタンス素子L1,L2で発生する磁界はそれぞれ逆向きになる。これにて、給電回路11を環状電極25の端部26a,26bに結合させたとき、端部26a,26bには逆向きの電流が励起され、環状電極25にて放射板15へ信号を送受信することができる。   The inductance elements L1 and L2 are formed at different positions on the left and right when the feeder circuit board 10 is seen through. The magnetic fields generated by the inductance elements L1 and L2 are opposite to each other. Thus, when the feeder circuit 11 is coupled to the end portions 26 a and 26 b of the annular electrode 25, a reverse current is excited in the end portions 26 a and 26 b, and signals are transmitted to and received from the radiation plate 15 by the annular electrode 25. can do.

(第3実施例、図9参照)
図9に本考案の第3実施例である無線ICデバイス1Cを示す。この無線ICデバイス1Cは、無線ICチップ5と給電回路基板10とからなる電磁結合モジュール2、環状電極25、放射板15を備えている点は前記第2実施例と同様である。異なるのは、放射板15の端部16a,16bを環状電極25の側方に沿って折り曲げ、端部16a,16bが平面視で環状電極25を両側から挟むように配置している点である。
(Refer to the third embodiment, FIG. 9)
FIG. 9 shows a wireless IC device 1C according to a third embodiment of the present invention. The wireless IC device 1C is the same as the second embodiment in that the wireless IC device 1C includes the electromagnetic coupling module 2, the annular electrode 25, and the radiation plate 15 each including the wireless IC chip 5 and the power feeding circuit board 10. The difference is that the end portions 16a and 16b of the radiation plate 15 are bent along the side of the annular electrode 25, and the end portions 16a and 16b are arranged so as to sandwich the annular electrode 25 from both sides in plan view. .

本第3実施例においては、放射板15の端部16a,16bを環状電極25側に折り曲げることにより、無線ICデバイス1Cを小型化できる。さらに、放射板15の端部16a,16bを所定の方向に向けることにより、所定の方向への指向性を向上することができる。また、端部16a,16bを含む折曲げ部分が環状電極25に近接して配置されるので、副次的な電磁界結合が発生し、環状電極25と放射板15との結合をさらに強くすることができ、無線ICデバイスの放射利得の向上や放射特性のさらなる広帯域化を図ることができる。   In the third embodiment, the radio IC device 1C can be downsized by bending the end portions 16a and 16b of the radiation plate 15 toward the annular electrode 25 side. Furthermore, directivity in a predetermined direction can be improved by directing the end portions 16a and 16b of the radiation plate 15 in a predetermined direction. Further, since the bent portions including the end portions 16a and 16b are arranged close to the annular electrode 25, secondary electromagnetic coupling occurs, and the coupling between the annular electrode 25 and the radiation plate 15 is further strengthened. Therefore, it is possible to improve the radiation gain of the wireless IC device and further widen the radiation characteristics.

(第4実施例、図10参照)
図10に本考案の第4実施例である無線ICデバイス1Dを示す。この無線ICデバイス1Dは、放射板15の端部を幅広部17a,17bとしたものである。他の構成は前記第2及び第3実施例と同様であり、その作用効果も第2及び第3実施例と同様である。なお、前記実施例1(図1参照)も、放射板15の両端部を幅広部17a,17bとしている。
(Refer to the fourth embodiment, FIG. 10)
FIG. 10 shows a wireless IC device 1D according to the fourth embodiment of the present invention. In the wireless IC device 1D, the end portions of the radiation plate 15 are wide portions 17a and 17b. Other configurations are the same as those of the second and third embodiments, and the operational effects thereof are also the same as those of the second and third embodiments. In the first embodiment (see FIG. 1), both end portions of the radiation plate 15 are wide portions 17a and 17b.

(第5実施例、図11参照)
図11に本考案の第5実施例である無線ICデバイス1Eを示す。この無線ICデバイス1Eは、放射板15の幅広部17a,17bに空隙18a,18bを形成したものである。他の構成は前記第2及び第4実施例と同様であり、その作用効果も第2及び第4実施例と同様である。特に、本第5実施例では、幅広部17a,17bに空隙18a,18bを設けることにより、放射板15の共振周波数を低くすることができ、放射板15の全体的な長さを短くでき、無線ICデバイスの放射特性を向上させながら、小型化を図ることができる。
(Refer to the fifth embodiment, FIG. 11)
FIG. 11 shows a wireless IC device 1E according to the fifth embodiment of the present invention. In this wireless IC device 1E, gaps 18a and 18b are formed in the wide portions 17a and 17b of the radiation plate 15. Other configurations are the same as those of the second and fourth embodiments, and the effects thereof are also the same as those of the second and fourth embodiments. In particular, in the fifth embodiment, by providing the wide portions 17a and 17b with the gaps 18a and 18b, the resonance frequency of the radiation plate 15 can be lowered, and the overall length of the radiation plate 15 can be shortened. Miniaturization can be achieved while improving the radiation characteristics of the wireless IC device.

(第6実施例、図12参照)
図12に本考案の第6実施例である無線ICデバイス1Fを示す。この無線ICデバイス1Fは、環状電極25の端部26a,26bを環状電極25の内側に向けて折り曲げたものである。他の構成は前記第2及び第4実施例と同様であり、その作用効果も第2及び第4実施例と同様である。特に、本第6実施例では、端部26a,26bを環状電極25の内側に向けて配置したため、端部26a,26bを含む折曲げ部分とそれに隣接する環状電極25の線路部分とで容量が発生する。この容量と環状電極25の長さにより環状電極25の共振周波数を設計することができ、環状電極25の全体的な長さを短くでき、無線ICデバイスの小型化を図ることができる。また、環状電極25の設計自由度が向上する。
(See the sixth embodiment, FIG. 12)
FIG. 12 shows a wireless IC device 1F according to a sixth embodiment of the present invention. This wireless IC device 1 </ b> F is formed by bending end portions 26 a and 26 b of the annular electrode 25 toward the inside of the annular electrode 25. Other configurations are the same as those of the second and fourth embodiments, and the effects thereof are also the same as those of the second and fourth embodiments. In particular, in the sixth embodiment, since the end portions 26a and 26b are arranged toward the inner side of the annular electrode 25, the capacitance is increased between the bent portion including the end portions 26a and 26b and the line portion of the annular electrode 25 adjacent thereto. appear. The resonance frequency of the annular electrode 25 can be designed by this capacity and the length of the annular electrode 25, the overall length of the annular electrode 25 can be shortened, and the radio IC device can be miniaturized. Moreover, the design freedom of the annular electrode 25 is improved.

(他の実施例)
なお、本考案に係る無線ICデバイスは前記実施例に限定するものではなく、その要旨の範囲内で種々に変更することができる。
(Other examples)
The wireless IC device according to the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist thereof.

例えば、前記実施例に示した放射板や基材の材料はあくまで例示である、必要な特性を有する材料であれば、任意のものを使用することができる。また、無線ICチップを電極に接続するのに、金属バンプ以外の処理を用いてもよい。   For example, the materials of the radiation plate and the base material shown in the above-described embodiment are merely examples, and any materials can be used as long as they have necessary characteristics. Further, processing other than metal bumps may be used to connect the wireless IC chip to the electrode.

さらに、無線ICは給電回路基板内の素子として作製しても構わない。給電回路基板内に無線IC部を形成することにより、無線IC部と給電回路との接続部における寄生成分をなくすことができ、無線ICデバイスの特性を向上させることができる。また、無線ICデバイスの低背化も可能である。さらに、給電回路基板の環状電極との結合部の電極形状や配置を変更することにより、給電回路と環状電極との結合を電界のみあるいは磁界のみにすることも可能である。   Further, the wireless IC may be manufactured as an element in the power supply circuit board. By forming the wireless IC part in the power supply circuit board, the parasitic component in the connection part between the wireless IC part and the power supply circuit can be eliminated, and the characteristics of the wireless IC device can be improved. In addition, the height of the wireless IC device can be reduced. Further, by changing the electrode shape and arrangement of the coupling portion with the annular electrode of the feeder circuit board, the coupling between the feeder circuit and the annular electrode can be limited to only an electric field or a magnetic field.

また、各実施例において、環状電極や放射板は左右対称に形成したものを示したが、左右対称ではなく、それぞれの環状電極は異なる位置で放射板と接続ないし結合していてもよい。   In each of the embodiments, the annular electrode and the radiation plate are formed symmetrically. However, the annular electrode may be connected to or coupled to the radiation plate at different positions.

第1実施例である無線ICデバイスを示す平面図。The top view which shows the radio | wireless IC device which is 1st Example. 第1実施例である無線ICデバイスの要部を示す断面図。Sectional drawing which shows the principal part of the radio | wireless IC device which is 1st Example. 第1実施例における整合部の様々な形状を示す平面図。The top view which shows various shapes of the alignment part in 1st Example. 第2実施例である無線ICデバイスを示す平面図。The top view which shows the radio | wireless IC device which is 2nd Example. 第2実施例である無線ICデバイスの給電回路を示す等価回路図。The equivalent circuit diagram which shows the electric power feeding circuit of the radio | wireless IC device which is 2nd Example. 第2実施例である無線ICデバイスを構成する給電回路基板上に無線ICチップを搭載した状態を示す斜視図。The perspective view which shows the state which mounted the radio | wireless IC chip on the electric power feeding circuit board which comprises the radio | wireless IC device which is 2nd Example. 第2実施例である無線ICデバイスの放射利得の周波数特性を示すグラフ。The graph which shows the frequency characteristic of the radiation gain of the radio | wireless IC device which is 2nd Example. 第2実施例である無線ICデバイスを構成する給電回路基板の積層構造を示す平面図。The top view which shows the laminated structure of the electric power feeding circuit board which comprises the radio | wireless IC device which is 2nd Example. 第3実施例である無線ICデバイスを示す平面図。The top view which shows the radio | wireless IC device which is 3rd Example. 第4実施例である無線ICデバイスを示す平面図。The top view which shows the radio | wireless IC device which is 4th Example. 第5実施例である無線ICデバイスを示す平面図。The top view which shows the radio | wireless IC device which is 5th Example. 第6実施例である無線ICデバイスを示す平面図。The top view which shows the radio | wireless IC device which is 6th Example.

符号の説明Explanation of symbols

1A〜1F…無線ICデバイス
2…電磁結合モジュール
5…無線ICチップ
10…給電回路基板
11…給電回路
15…放射板
16a,16b…端部
17a,17b…幅広部
18a,18b…空隙
25…環状電極
26a,26b…端部
27…接続部
38a〜38d…整合部
L1,L2…インダクタンス素子
DESCRIPTION OF SYMBOLS 1A-1F ... Wireless IC device 2 ... Electromagnetic coupling module 5 ... Wireless IC chip 10 ... Feed circuit board 11 ... Feed circuit 15 ... Radiation plate 16a, 16b ... End part 17a, 17b ... Wide part 18a, 18b ... Air gap 25 ... Ring Electrode 26a, 26b ... End 27 ... Connection part 38a-38d ... Matching part L1, L2 ... Inductance element

Claims (10)

無線ICと、
少なくとも一対の端部を有する環状電極と、
前記環状電極の一対の端部に設けられた整合部と、
前記環状電極の電流最大点に接続されたダイポール型の放射板と、
を備え、
前記無線ICは前記整合部と結合し、
前記環状電極と前記放射板とは少なくとも一部で電磁界結合していること、
を特徴とする無線ICデバイス。
A wireless IC;
An annular electrode having at least a pair of ends;
A matching portion provided at a pair of ends of the annular electrode;
A dipole radiation plate connected to the current maximum point of the annular electrode;
With
The wireless IC is coupled to the matching unit,
The annular electrode and the radiation plate are electromagnetically coupled at least in part;
A wireless IC device characterized by the above.
無線ICと、
少なくとも一対の端部を有する環状電極と、
インダクタンス素子を含んで所定の共振周波数を有する共振回路及び/又は整合回路からなる給電回路と、
前記環状電極の電流最大点に接続されたダイポール型の放射板と、
を備え、
前記無線ICは前記給電回路と結合し、
前記環状電極と前記放射板とは少なくとも一部で電磁界結合していること、
を特徴とする無線ICデバイス。
A wireless IC;
An annular electrode having at least a pair of ends;
A power feeding circuit including a resonance circuit and / or a matching circuit including an inductance element and having a predetermined resonance frequency;
A dipole-shaped radiation plate connected to the current maximum point of the annular electrode;
With
The wireless IC is coupled with the power feeding circuit,
The annular electrode and the radiation plate are electromagnetically coupled at least in part;
A wireless IC device characterized by the above.
前記給電回路はセラミック又は樹脂からなる多層基板で構成された給電回路基板に形成されており、
前記無線ICと前記給電回路基板とで電磁結合モジュールを構成していること、
を特徴とする請求項2に記載の無線ICデバイス。
The power supply circuit is formed on a power supply circuit board composed of a multilayer substrate made of ceramic or resin,
The wireless IC and the power supply circuit board constitute an electromagnetic coupling module;
The wireless IC device according to claim 2.
前記環状電極は矩形形状をなし、前記放射板は前記環状電極の長手方向の中央部に接続されていること、を特徴とする請求項1ないし請求項3のいずれかに記載の無線ICデバイス。   4. The wireless IC device according to claim 1, wherein the annular electrode has a rectangular shape, and the radiation plate is connected to a central portion in a longitudinal direction of the annular electrode. 5. 前記環状電極の電流最大点は前記放射板において発生する電流の最大点に接続されていること、を特徴とする請求項1ないし請求項4のいずれかに記載の無線ICデバイス。   The wireless IC device according to any one of claims 1 to 4, wherein a maximum current point of the annular electrode is connected to a maximum point of current generated in the radiation plate. 前記環状電極の電流最大点は前記放射板の長手方向の中央部に接続されていること、を特徴とする請求項1ないし請求項5のいずれかに記載の無線ICデバイス。   The wireless IC device according to any one of claims 1 to 5, wherein a maximum current point of the annular electrode is connected to a central portion in a longitudinal direction of the radiation plate. 前記環状電極は矩形形状をなし、該矩形形状の3辺において前記放射板と電磁界結合していること、を特徴とする請求項1ないし請求項6に記載の無線ICデバイス。   The wireless IC device according to any one of claims 1 to 6, wherein the annular electrode has a rectangular shape, and is electromagnetically coupled to the radiation plate at three sides of the rectangular shape. 前記放射板の両端部に該放射板の長手方向の中央部分の線幅よりも広い幅広部を設けたことを特徴とする請求項1ないし請求項7のいずれかに記載の無線ICデバイス。   The wireless IC device according to any one of claims 1 to 7, wherein a wide portion wider than a line width of a central portion in a longitudinal direction of the radiation plate is provided at both ends of the radiation plate. 前記放射板の両端部は、平面視で前記環状電極を両側から挟むように配置されていること、を特徴とする請求項1ないし請求項8のいずれかに記載の無線ICデバイス。   The wireless IC device according to any one of claims 1 to 8, wherein both end portions of the radiation plate are arranged so as to sandwich the annular electrode from both sides in a plan view. 前記環状電極の前記一対の端部を該環状電極の内側に向けて配置したことを特徴とする請求項1ないし請求項9のいずれかに記載の無線ICデバイス。   The wireless IC device according to any one of claims 1 to 9, wherein the pair of end portions of the annular electrode are arranged toward the inside of the annular electrode.
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