JPH11261330A - Non-contact ic card antenna - Google Patents
Non-contact ic card antennaInfo
- Publication number
- JPH11261330A JPH11261330A JP10057707A JP5770798A JPH11261330A JP H11261330 A JPH11261330 A JP H11261330A JP 10057707 A JP10057707 A JP 10057707A JP 5770798 A JP5770798 A JP 5770798A JP H11261330 A JPH11261330 A JP H11261330A
- Authority
- JP
- Japan
- Prior art keywords
- card
- patch
- antenna
- conductor
- ground conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004020 conductor Substances 0.000 claims abstract description 48
- 230000005855 radiation Effects 0.000 abstract description 9
- 230000005684 electric field Effects 0.000 abstract description 5
- 230000005672 electromagnetic field Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はマイクロ波などの電
波を利用して情報の授受を行う非接触型ＩＣカードに搭
載するアンテナに係り、特に誘電体基板の一方の面に接
地導体を配し、他面に円形や方形などのパッチを配した
マイクロストリップ線路を用いたパッチアンテナをＩＣ
カードの一部として構成するアンテナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna mounted on a non-contact type IC card which transmits and receives information using radio waves such as microwaves, and more particularly to an antenna provided with a ground conductor on one surface of a dielectric substrate. , A patch antenna using a microstrip line with a circular or square patch on the other side
An antenna configured as part of a card.
【０００２】[0002]
【従来の技術】特開平6−282699 号記載の「非接触情報
伝達装置」に無線情報を送受信するアンテナとして接地
導体との間にスペーサーを介して、基板の片面に構成さ
れた方形のパッチアンテナが形成されている。このアン
テナの構成はマイクロストリップ線路で構成されたパッ
チアンテナと考えることができる。2. Description of the Related Art A rectangular patch antenna formed on one side of a substrate via a spacer between a ground conductor and an antenna for transmitting and receiving wireless information to and from a "non-contact information transmitting device" described in Japanese Patent Application Laid-Open No. 6-282699. Are formed. The configuration of this antenna can be considered as a patch antenna composed of a microstrip line.
【０００３】上記従来例記載のアンテナは片面の接地導
体がＩＣカードの形状をしており、一対の辺が、他の一
対の辺よりも長い形状をしており、円形や、方形の対称
形のパッチアンテナ面形状に対して電磁界の分布が均等
にならずに、円偏波の電波を送受信する際にアンテナの
パッチ面内でのパッチアンテナの法線回りの回転位置に
よる放射利得が一定とならずに、いわゆる軸比が大きく
なり、アンテナの放射利得が低下する要因となる。[0003] The antenna described in the prior art has a ground conductor on one side in the shape of an IC card, a pair of sides having a shape longer than the other pair of sides, and a circular or square symmetrical shape. The distribution of the electromagnetic field is not even with respect to the surface shape of the patch antenna. Instead, the so-called axial ratio increases, which causes a reduction in the radiation gain of the antenna.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は円偏波
を送受信するマイクロストリップ・パッチアンテナの軸
比を向上させ、アンテナの放射利得を向上させることに
ある。SUMMARY OF THE INVENTION An object of the present invention is to improve the axial ratio of a microstrip patch antenna for transmitting and receiving circularly polarized waves, and to improve the radiation gain of the antenna.
【０００５】[0005]
【課題を解決するための手段】本発明では、この課題を
解決するために、マイクロ波の電波を使う非接触型ＩＣ
カードに搭載される円偏波マイクロストリップパッチ・
アンテナのパッチ形状に対してほぼ相似形の接地導体を
ＩＣカードのパッチ面とは反対の面に配した。According to the present invention, in order to solve this problem, a non-contact type IC using microwave radio waves is provided.
Circularly polarized microstrip patch mounted on card
A ground conductor substantially similar to the patch shape of the antenna was arranged on the surface opposite to the patch surface of the IC card.
【０００６】[0006]
【発明の実施の形態】図１は特開平6−282699 号公報に
記載の無線カードを模したＩＣカード形状の概略を示す
平面図で、１は誘電体、２はマイクロストリップパッチ
導体、３は接地導体である。また、図２は図１の従来例
の断面図である。アンテナ面の円形マイクロストリップ
・パッチ導体２に対して接地面の形状は、通常、ＩＣカ
ードの形状とする例が多く、従って、電磁界の分布を観
ると、対称とはならずに、従って、ＩＣカードの短辺方
向に振動する電界に対する放射利得と、長辺方向に振動
する電界に対する放射利得とが異なり、円偏波の場合に
は、アンテナとしての放射利得が低下することになる。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view schematically showing an IC card shape simulating a wireless card described in JP-A-6-282699, wherein 1 is a dielectric, 2 is a microstrip patch conductor, and 3 is a microstrip patch conductor. It is a ground conductor. FIG. 2 is a sectional view of the conventional example of FIG. In many cases, the shape of the ground plane with respect to the circular microstrip patch conductor 2 on the antenna surface is usually the shape of an IC card. Therefore, the distribution of the electromagnetic field is not symmetrical. The radiation gain for the electric field oscillating in the short side direction of the IC card is different from the radiation gain for the electric field oscillating in the long side direction. In the case of circular polarization, the radiation gain as an antenna is reduced.
【０００７】図３および図４はマイクロストリップ・パ
ッチアンテナの形状が方形のものの例を示したもので、
同様な問題がある。図３および図４において、４は誘電
体、５はマイクロストリップ・パッチ導体、６は接地導
体である。FIGS. 3 and 4 show examples of a microstrip patch antenna having a square shape.
There is a similar problem. 3 and 4, reference numeral 4 denotes a dielectric, 5 denotes a microstrip patch conductor, and 6 denotes a ground conductor.
【０００８】図５は本発明の第１の実施例を示す非接触
ＩＣカードの平面図の概略を示したもので、図６は図５
の断面図を表している。７はＩＣカード形状の誘電体、
８は円形のマイクロストリップ・パッチアンテナ導体、
９は接地導体である。本例において特徴的なことは、接
地導体９を対称な形状にしたもので、ＩＣカードの短辺
に振動する電界に対する放射利得と、長辺振動する電界
に対する放射利得とが均衡するために、従来例に比べて
マイクロストリップ・パッチアンテナ８と接地導体９間
の電磁界の分布がパッチアンテナの法線回りの回転位置
によらずほぼ均等になることは明らかである。FIG. 5 is a schematic plan view of a non-contact IC card according to a first embodiment of the present invention, and FIG.
FIG. 7 is an IC card-shaped dielectric,
8 is a circular microstrip patch antenna conductor,
9 is a ground conductor. What is characteristic in this example is that the ground conductor 9 has a symmetrical shape, and the radiation gain for the electric field oscillating on the short side of the IC card and the radiation gain for the electric field oscillating on the long side are balanced. It is apparent that the distribution of the electromagnetic field between the microstrip patch antenna 8 and the ground conductor 9 becomes almost uniform irrespective of the rotational position around the normal of the patch antenna as compared with the conventional example.
【０００９】図７および図８は第２の実施例で、接地導
体形状をマイクロストリップ・パッチアンテナの形状に
相似となるようにした。軸比の改善に関しては第１の実
施例と同等以上の効果が得られる。図７および図８にお
いて、１０はＩＣカード形状の誘電体、１１は円形のマ
イクロストリップ・パッチアンテナ導体、１２は接地導
体である。FIGS. 7 and 8 show a second embodiment in which the shape of the ground conductor is made similar to the shape of the microstrip patch antenna. With respect to the improvement of the axial ratio, the same or better effects as in the first embodiment can be obtained. 7 and 8, reference numeral 10 denotes an IC card-shaped dielectric, 11 denotes a circular microstrip patch antenna conductor, and 12 denotes a ground conductor.
【００１０】図９および図１０は本発明の第３の実施例
の平面図および断面図を表す。１３はＩＣカード形状の
誘電体、１４はマイクロストリップ・パッチアンテナの
導体、１５は接地導体である。本実施例では、マイクロ
ストリップ・パッチアンテナ導体１４の形状が方形で、
特に、円偏波の場合は正方形とすることが多い。この方
形のマイクロストリップ・パッチアンテナ導体１４に合
わせて、接地導体１５もまた方形とすることで、電磁界
の分布を均一にすることができた。FIGS. 9 and 10 are a plan view and a sectional view, respectively, of a third embodiment of the present invention. 13 is an IC card-shaped dielectric, 14 is a conductor of the microstrip patch antenna, and 15 is a ground conductor. In this embodiment, the shape of the microstrip patch antenna conductor 14 is square,
In particular, in the case of circular polarization, the shape is often a square. By making the ground conductor 15 also rectangular in accordance with the rectangular microstrip patch antenna conductor 14, the distribution of the electromagnetic field could be made uniform.
【００１１】図１１および図１２は第４の実施例を示す
ＩＣカードの平面図および断面図である。図において、
１６はＩＣカード形状の誘電体、１７は、マイクロスト
リップ・パッチアンテナ導体、１８は接地導体である。
第３の実施例と異なるところは、マイクロストリップ・
パッチアンテナ導体１７の位置が、ＩＣカードの中央よ
りになっていることである。FIG. 11 and FIG. 12 are a plan view and a sectional view of an IC card showing a fourth embodiment. In the figure,
16 is an IC card-shaped dielectric, 17 is a microstrip patch antenna conductor, and 18 is a ground conductor.
The difference from the third embodiment is that the microstrip
The point is that the position of the patch antenna conductor 17 is closer to the center of the IC card.
【００１２】図１３および図１４は第５の実施例を示す
ＩＣカードの平面図および断面図である。１９はＩＣカ
ード形状の誘電体、２０はマイクロストリップ・パッチ
アンテナ導体、２１は第１のマイクロストリップ線路、
２２は第２のマイクロストリップ線路、２３はスルーホ
ール、２４は信号処理ＩＣ、２５は接地スルーホールで
ある。２６は接地導体、２７，２８はスルーホール導体
である。FIG. 13 and FIG. 14 are a plan view and a sectional view of an IC card showing a fifth embodiment. 19 is an IC card-shaped dielectric, 20 is a microstrip patch antenna conductor, 21 is a first microstrip line,
22 is a second microstrip line, 23 is a through hole, 24 is a signal processing IC, and 25 is a ground through hole. 26 is a ground conductor, and 27 and 28 are through-hole conductors.
【００１３】本実施例は、より具体的な、ＩＣカードの
構成を示したもので、接地導体２６を、マイクロストリ
ップ・パッチ導体２０の中心に対して、対称に、ＩＣカ
ードの短辺の大きさで、方形に成形した。The present embodiment shows a more specific configuration of an IC card. The ground conductor 26 is symmetrically arranged with respect to the center of the microstrip patch conductor 20 so that the size of the short side of the IC card is reduced. Now, it was shaped into a square.
【００１４】マイクロストリップ・パッチアンテナ導体
２０からの信号を信号処理ＩＣ２４に伝達するために、
第１のマイクロストリップ線路２１を介在させた。第２
のマイクロストリップ線路２２は、一端がスルーホール
２３で接地導体に接地されており、インピーダンス変換
や共振のためのインピーダンス素子となる。In order to transmit a signal from the microstrip patch antenna conductor 20 to the signal processing IC 24,
The first microstrip line 21 was interposed. Second
The microstrip line 22 has one end grounded to a ground conductor through a through hole 23, and serves as an impedance element for impedance conversion and resonance.
【００１５】ＩＣ２４では、マイクロストリップ・パッ
チアンテナ導体２０からの信号を処理し、ＩＣカードが
電池を持たない場合には、マイクロ波の信号の中から信
号を取り出したり、マイクロ波の信号に情報を乗せる復
調，変調の機能や、情報を記憶するメモリ機能のほか
に、信号処理回路全体に電力を供給するための発電機能
を有する。The IC 24 processes the signal from the microstrip patch antenna conductor 20. If the IC card has no battery, the IC 24 extracts a signal from the microwave signal, or outputs information to the microwave signal. In addition to the function of demodulation and modulation to be loaded, the function of storing information, and the function of generating power for supplying power to the entire signal processing circuit.
【００１６】[0016]
【発明の効果】本発明によれば、マイクロ波の電波を使
い質問器との間で円偏波の電波で情報のやりとりを行う
応答器であるＩＣカードに搭載した、マイクロストリッ
プ・パッチアンテナの軸比を改善することができ、当該
マイクロストリップパッチアンテナの利得向上と、ＩＣ
カードの設置状態によらず、良好な送受信状態が得ら
れ、ＩＣカードシステムの情報伝達の信頼性向上に寄与
する。According to the present invention, there is provided a microstrip patch antenna mounted on an IC card which is a transponder which exchanges information with an interrogator using a microwave radio wave by using a circularly polarized radio wave. The axial ratio can be improved, the gain of the microstrip patch antenna can be improved, and
A good transmission / reception state is obtained irrespective of the installation state of the card, which contributes to the improvement of the reliability of information transmission of the IC card system.
【図１】ＩＣカードの従来例の平面図。FIG. 1 is a plan view of a conventional example of an IC card.
【図２】ＩＣカードの従来例の断面図。FIG. 2 is a sectional view of a conventional example of an IC card.
【図３】ＩＣカードの従来例の平面図。FIG. 3 is a plan view of a conventional example of an IC card.
【図４】ＩＣカードの従来例の断面図。FIG. 4 is a sectional view of a conventional example of an IC card.
【図５】本発明の第１の実施例のＩＣカードの平面図。FIG. 5 is a plan view of the IC card according to the first embodiment of the present invention.
【図６】本発明の第１の実施例のＩＣカードの断面図。FIG. 6 is a sectional view of the IC card according to the first embodiment of the present invention.
【図７】本発明の第２の実施例のＩＣカードの平面図。FIG. 7 is a plan view of an IC card according to a second embodiment of the present invention.
【図８】本発明の第２の実施例のＩＣカードの断面図。FIG. 8 is a sectional view of an IC card according to a second embodiment of the present invention.
【図９】本発明の第３の実施例のＩＣカードの平面図。FIG. 9 is a plan view of an IC card according to a third embodiment of the present invention.
【図１０】本発明の第３の実施例のＩＣカードの断面
図。FIG. 10 is a sectional view of an IC card according to a third embodiment of the present invention.
【図１１】本発明の第４の実施例のＩＣカードの平面
図。FIG. 11 is a plan view of an IC card according to a fourth embodiment of the present invention.
【図１２】本発明の第４の実施例のＩＣカードの断面
図。FIG. 12 is a sectional view of an IC card according to a fourth embodiment of the present invention.
【図１３】本発明の第５の実施例のＩＣカードの平面
図。FIG. 13 is a plan view of an IC card according to a fifth embodiment of the present invention.
【図１４】本発明の第５の実施例のＩＣカードの断面
図。FIG. 14 is a sectional view of an IC card according to a fifth embodiment of the present invention.
１９…誘電体、２０…マイクロストリップ・パッチアン
テナ、２１，２２…マイクロストリップ線路、２２，２
５…スルーホール、２４…ＩＣ、２６…接地導体、２
７，２８…スルーホール導体。19: Dielectric, 20: Microstrip patch antenna, 21, 22: Microstrip line, 22, 2
5 through hole, 24 IC, 26 ground conductor, 2
7, 28: Through-hole conductor.
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｈ０４Ｂ 5/02 Ｇ０６Ｋ 19/00 Ｈ Continued on the front page (51) Int.Cl. 6 Identification code FI H04B 5/02 G06K 19/00 H
Claims (2)
器（ＩＣカード）との間で情報のやり取りを行うＩＣカ
ードシステムにおいて、ＩＣカードに搭載する、質問器
から応答器へ電波を送受信するアンテナに、マイクロス
トリップ線路構成の方形状あるいは円形状の単一パッチ
導体からなるマイクロストリップ・パッチアンテナを用
い、当該パッチに対応するマイクロストリップ線路構成
の接地導体の形状を、ＩＣカードの短辺の長さと同等以
下の大きさを持つ、当該パッチ導体と相似形状としたこ
とを特徴とする非接触ＩＣカードアンテナ。In an IC card system for exchanging information between an interrogator and a transponder (IC card) using radio waves in a microwave band, radio waves are transmitted from the interrogator to the transponder mounted on the IC card. As a transmitting / receiving antenna, a microstrip patch antenna composed of a single patch conductor having a square or circular shape with a microstrip line configuration is used, and the shape of the ground conductor with the microstrip line configuration corresponding to the patch is changed to the short length of the IC card. A non-contact IC card antenna having a shape similar to or less than the length of a side and similar to the patch conductor.
器（ＩＣカード）との間で情報のやり取りを行うＩＣカ
ードシステムにおいて、ＩＣカードに搭載する、質問器
から応答器へ電波を送受信するアンテナに、マイクロス
トリップ線路構成の方形状あるいは円形状の単一パッチ
導体からなるマイクロストリップ・パッチアンテナを用
い、当該パッチに対応するマイクロストリップ線路構成
の接地導体の形状を、ＩＣカードの短辺の長さと同等以
下の長さの正方形状としたことを特徴とする非接触ＩＣ
カードアンテナ。2. An IC card system for exchanging information between an interrogator and a transponder (IC card) using a radio wave in a microwave band, wherein a radio wave is transmitted from the interrogator to the transponder mounted on the IC card. As a transmitting / receiving antenna, a microstrip patch antenna composed of a single patch conductor having a square or circular shape with a microstrip line configuration is used, and the shape of the ground conductor with the microstrip line configuration corresponding to the patch is changed to the short length of the IC card. Non-contact IC characterized in that it has a square shape having a length equal to or less than the side length.
Card antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10057707A JPH11261330A (en) | 1998-03-10 | 1998-03-10 | Non-contact ic card antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10057707A JPH11261330A (en) | 1998-03-10 | 1998-03-10 | Non-contact ic card antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11261330A true JPH11261330A (en) | 1999-09-24 |
Family
ID=13063428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10057707A Pending JPH11261330A (en) | 1998-03-10 | 1998-03-10 | Non-contact ic card antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11261330A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005041351A1 (en) * | 2003-10-23 | 2005-05-06 | Murata Manufacturing.Co., Ltd. | Radio communication module |
| JP2007049422A (en) * | 2005-08-10 | 2007-02-22 | Sony Corp | Communication system, transmitting apparatus and method, and receiving apparatus and method |
| JPWO2006001049A1 (en) * | 2004-06-23 | 2008-04-17 | 三菱電機株式会社 | Wireless tag device |
| JP2008211778A (en) * | 2007-02-01 | 2008-09-11 | Canon Inc | Antenna device |
| CN102394362A (en) * | 2011-07-07 | 2012-03-28 | 江苏大学 | Composite patch antenna based on left-handed material effect |
| US8188931B2 (en) | 2008-01-07 | 2012-05-29 | Fujitsu Limited | Electronic device, antenna and article |
| JP2012181684A (en) * | 2011-03-01 | 2012-09-20 | Ricoh Co Ltd | Rfid tag and electronic device with rfid tag mounted therein |
-
1998
- 1998-03-10 JP JP10057707A patent/JPH11261330A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005041351A1 (en) * | 2003-10-23 | 2005-05-06 | Murata Manufacturing.Co., Ltd. | Radio communication module |
| JPWO2005041351A1 (en) * | 2003-10-23 | 2007-11-29 | 株式会社村田製作所 | Wireless communication module |
| JPWO2006001049A1 (en) * | 2004-06-23 | 2008-04-17 | 三菱電機株式会社 | Wireless tag device |
| JP2007049422A (en) * | 2005-08-10 | 2007-02-22 | Sony Corp | Communication system, transmitting apparatus and method, and receiving apparatus and method |
| US7696835B2 (en) | 2005-08-10 | 2010-04-13 | Sony Corporation | Communication system, transmitting device, transmitting method, receiving device, and receiving method |
| JP2008211778A (en) * | 2007-02-01 | 2008-09-11 | Canon Inc | Antenna device |
| US8188931B2 (en) | 2008-01-07 | 2012-05-29 | Fujitsu Limited | Electronic device, antenna and article |
| JP2012181684A (en) * | 2011-03-01 | 2012-09-20 | Ricoh Co Ltd | Rfid tag and electronic device with rfid tag mounted therein |
| CN102394362A (en) * | 2011-07-07 | 2012-03-28 | 江苏大学 | Composite patch antenna based on left-handed material effect |
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