JP2001177448A - Tuning circuit for responder - Google Patents
Tuning circuit for responderInfo
- Publication number
- JP2001177448A JP2001177448A JP35695799A JP35695799A JP2001177448A JP 2001177448 A JP2001177448 A JP 2001177448A JP 35695799 A JP35695799 A JP 35695799A JP 35695799 A JP35695799 A JP 35695799A JP 2001177448 A JP2001177448 A JP 2001177448A
- Authority
- JP
- Japan
- Prior art keywords
- antenna coil
- transponder
- responder
- tuning
- tuning circuit
- 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
- 230000003071 parasitic effect Effects 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、質問器からの電磁
波により応答器の電力が得られ、この電力により応答器
が動作し、質問器と応答器間のデータの送受信を可能と
する非接触式データ通信システムに係り、特に応答器の
同調回路に部品としてコンデンサを接続しない同調回路
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact system in which power of a transponder is obtained by an electromagnetic wave from an interrogator, the transponder operates by this power, and data can be transmitted and received between the interrogator and the transponder. More particularly, the present invention relates to a tuning circuit in which a capacitor is not connected as a component to a tuning circuit of a transponder.
【０００２】[0002]
【従来の技術】定期券を始めとするカードシステムの要
求は、磁気カードのような接触密着型のシステムから無
線を用いて非接触で動作させるシステムに移行しつつあ
る。すなわち応答器であるＩＣカードの動作に必要な電
力を無線によってカードに供給し、カード上の電子回路
を動作させ、質問器とのデータ通信を行う非接触式デー
タ通信システムである。2. Description of the Related Art A demand for a card system such as a commuter pass is shifting from a contact-type system such as a magnetic card to a system that operates wirelessly without contact. That is, this is a non-contact data communication system that wirelessly supplies power required for the operation of an IC card as a transponder to the card, operates an electronic circuit on the card, and performs data communication with the interrogator.
【０００３】非接触式データ通信システムは、ＲＦＩＤ
カードと称する応答器に対し、リーダと称する質問器か
らの質問電波で質問をし、質問器では応答器からの応答
電波を受け、応答電波に乗せられたデータを受信するこ
とにより応答器に接触することなく応答器のデータを受
信する。質問器および応答器はそれぞれアンテナを備
え、電磁誘導により電波の送受を行う。この時の送受電
波のキャリア周波数には１２５ｋＨｚ等が使用される。
応答器は質問器からの質問電波のエネルギをを電源とし
て利用するので格別の電源を使用しない。A non-contact data communication system is an RFID.
An interrogator called a card is interrogated by an interrogator from an interrogator called a reader. The interrogator receives the response radio wave from the transponder and contacts the transponder by receiving the data carried on the response radio wave. Receive data of transponder without doing. The interrogator and the transponder each have an antenna and transmit and receive radio waves by electromagnetic induction. At this time, 125 kHz or the like is used as the carrier frequency of the transmitted / received radio wave.
Since the transponder uses the energy of the interrogation radio wave from the interrogator as a power source, no special power source is used.
【０００４】したがって、応答器の電源方式はパッシブ
電源方式である。このような応答器として用いられる装
置としては、特公昭６２−４３２３号の「信号識別装
置」がある。この「信号識別装置」では、コイルでアン
テナを構成している。カード上にアンテナコイルを形成
する場合、薄型化が必須のため同一平面上に細線を渦巻
き状に巻き込んだものが適している。また、より大きな
誘起電圧を得るためにアンテナコイルに並列にコンデン
サを接続し、所望の周波数（例えば、１２５ｋＨｚ）に
同調させる技術は知られている。また、この同調用コン
デンサを接続する代わりにアンテナコイルの巻き数を多
くして、その寄生容量によって同調用コンデンサの静電
容量を確保する方法も知られている。Therefore, the power supply system of the transponder is a passive power supply system. As a device used as such a transponder, there is a "signal discriminating device" of Japanese Patent Publication No. 62-4323. In this “signal identification device”, an antenna is configured by a coil. When an antenna coil is formed on a card, a thin wire is spirally wound on the same plane because thinning is essential. In addition, a technique is known in which a capacitor is connected in parallel to an antenna coil to obtain a larger induced voltage, and a desired frequency (for example, 125 kHz) is tuned. There is also known a method in which the number of turns of the antenna coil is increased instead of connecting the tuning capacitor, and the capacitance of the tuning capacitor is secured by the parasitic capacitance.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述の
ような、より大きな誘起電圧を得るための２つの方法に
はそれぞれ次のような問題点があった。 （１）並列にコンデンサを接続する方法においては、応
答器を主としてカード状に形成した場合に、曲げや捻じ
れなどの負荷がかかった際に、この同調用コンデンサが
破損し、誘起電力が低下するという性能劣化が生じ易
い。 （２）アンテナコイルの巻き数を増やして寄生容量を生
じさせて同調をとる方法においては、寄生容量が所望の
アンテナコイルの出力端のみでなく、アンテナコイルの
種々の部分に生じ、所望の周波数における誘起電力が低
下し、出力効率が低下する。本発明は、上記課題を解決
するために、アンテナコイルの巻き始めと巻き終わりに
コイルを形成し、この２つのコイルを対向させることに
より、アンテナコイルの出力端に形成されたこの２つの
コイル間に寄生容量を生じさせ、この寄生容量を同調用
容量として使用する応答器の同調回路を提供することを
目的とする。However, the two methods for obtaining a larger induced voltage as described above have the following problems. (1) In the method of connecting capacitors in parallel, when the transponder is mainly formed in a card shape, when a load such as bending or twisting is applied, the tuning capacitor is damaged, and the induced power is reduced. Performance degradation. (2) In the method of tuning by increasing the number of turns of the antenna coil to generate a parasitic capacitance, the parasitic capacitance is generated not only at the output end of the desired antenna coil but also at various portions of the antenna coil and the desired frequency is obtained. , The output power decreases. In order to solve the above-mentioned problem, the present invention forms a coil at the beginning and end of winding of an antenna coil, and makes the two coils oppose each other. It is an object of the present invention to provide a tuning circuit of a transponder which generates a parasitic capacitance in the transponder and uses the parasitic capacitance as a tuning capacitance.
【０００６】[0006]
【課題を解決するための手段】本発明の応答器の同調回
路は、質問器からの電磁波により応答器の電力が得ら
れ、この電力により応答器が動作し、質問器と応答器間
のデータの送受信を可能とする非接触式データ通信シス
テムにおいて、前記応答器内に細線を同一平面状に渦巻
き状に形成したアンテナコイルと、このアンテナコイル
の巻き始めと巻き終わりに、それぞれ同一平面上に対向
して渦巻き状に形成したコイルとを備え、この対向する
コイル間に生じる寄生コンデンサと前記アンテナコイル
とで同調回路を形成し、同調周波数が前記電磁波の周波
数に同調することを特徴とするものである。According to the tuning circuit of the transponder of the present invention, the power of the transponder is obtained by the electromagnetic wave from the interrogator, the transponder is operated by this power, and the data between the interrogator and the transponder is transmitted. In a non-contact data communication system capable of transmitting and receiving data, an antenna coil in which a fine wire is spirally formed on the same plane in the transponder, and at the beginning and end of winding of the antenna coil, respectively, are placed on the same plane. A coil formed in a spiral shape facing the coil, a tuning circuit is formed by a parasitic capacitor generated between the facing coil and the antenna coil, and a tuning frequency is tuned to a frequency of the electromagnetic wave. It is.
【０００７】本発明によれば、アンテナコイルの巻き始
めと巻き終わりにコイルを形成し、この２つのコイルを
対向させて寄生容量を得るように構成したので、同調用
コンデンサを接続する必要がなくなり、曲げや捻じりに
強い応答器を実現できる。また、寄生容量がアンテナコ
イルの両端に発生するのでアンテナコイルの出力端にコ
ンデンサが接続されたのと同じ効果をもたらすので、出
力効率を向上させ得る同調回路が実現できる。According to the present invention, since a coil is formed at the beginning and end of winding of the antenna coil and the two coils are opposed to each other to obtain a parasitic capacitance, there is no need to connect a tuning capacitor. Therefore, a transponder that is strong in bending and twisting can be realized. In addition, since a parasitic capacitance is generated at both ends of the antenna coil, the same effect as when a capacitor is connected to the output terminal of the antenna coil is obtained. Therefore, a tuning circuit that can improve output efficiency can be realized.
【０００８】[0008]
【発明の実施の形態】以下本発明の応答器の同調回路に
ついて、図を用いて詳しく説明する。図１は本発明の一
実施形態を示すもので、特にカード状に形成された応答
器に搭載可能な平面状に構成する薄型のアンテナコイル
と寄生容量生成用コイルの実施の形態を現すものであ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tuning circuit of a transponder according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, particularly showing an embodiment of a thin antenna coil and a parasitic capacitance generating coil which are formed in a planar shape and can be mounted on a transponder formed in a card shape. is there.
【０００９】図１はカードとしてラミネートする前のア
ンテナコイルと寄生容量生成用コイルのみの模式図であ
り、１はアンテナコイル、２、２は寄生容量生成用コイ
ルである。図１（Ａ）はその平面図、図１（Ｂ）はその
側面図であり、両図ともアンテナコイル１および寄生容
量生成用コイル２、２は１本の線で表現しているが、実
際は両コイルとも渦巻き状に巻き込んだものであり、ま
た図１（Ｂ）においては、実際は寄生容量生成用コイル
２、２は効率よく容量を生成するために互いに密着して
形成されるが、説明を分かり易くするために離れている
ように表現したものである。FIG. 1 is a schematic view showing only an antenna coil and a parasitic capacitance generating coil before being laminated as a card, wherein 1 is an antenna coil, and 2 and 2 are parasitic capacitance generating coils. FIG. 1 (A) is a plan view thereof, and FIG. 1 (B) is a side view thereof. In both figures, the antenna coil 1 and the parasitic capacitance generating coils 2 and 2 are represented by a single line. Both coils are spirally wound, and in FIG. 1B, the parasitic capacitance generating coils 2 and 2 are actually formed in close contact with each other in order to efficiently generate capacitance. It is expressed as being separated for clarity.
【００１０】図１に示すように、寄生容量生成用コイル
２、２はアンテナコイル１の巻き始めと巻き終わりに同
一形状で形成している。これは、出力効率を向上させる
べく寄生により生成される静電容量を積極的にかつ効率
よくアンテナコイル１の出力端に生成させるためであ
る。寄生容量生成用コイル２、２は互いに対向してお
り、両者間には図２（Ａ）に示すように寄生容量３が生
成される。As shown in FIG. 1, the parasitic capacitance generating coils 2 and 2 are formed in the same shape at the beginning and end of winding of the antenna coil 1. This is because the capacitance generated by the parasitic element is positively and efficiently generated at the output end of the antenna coil 1 in order to improve the output efficiency. The parasitic capacitance generating coils 2 and 2 are opposed to each other, and a parasitic capacitance 3 is generated between the two as shown in FIG.
【００１１】この寄生容量３を含むアンテナコイル１お
よび寄生容量生成用コイル２、２の等価回路は図２
（Ｂ）のように表現でき、並列共振回路、すなわち同調
回路を構成する。このように寄生容量生成用コイル２、
２を形成することにより、寄生容量３を積極的かつ効率
よくアンテナコイル１の出力端に生成することができる
ので、全体として一つのコイルを形成するのみでその一
部をアンテナコイル１および寄生容量生成用コイル２、
２として使用することにより同調回路とすることができ
る。An equivalent circuit of the antenna coil 1 including the parasitic capacitance 3 and the parasitic capacitance generating coils 2 and 2 is shown in FIG.
It can be expressed as (B), and constitutes a parallel resonance circuit, that is, a tuning circuit. Thus, the parasitic capacitance generating coil 2
2, the parasitic capacitance 3 can be positively and efficiently generated at the output end of the antenna coil 1. Therefore, only one coil is formed as a whole, and a part of the coil is formed with the antenna coil 1 and the parasitic capacitance. Generating coil 2,
A tuning circuit can be obtained by using the second circuit.
【００１２】以上説明したように、コイルを形成するの
みで同調回路とすることができるので、アンテナコイル
１のインダクタンスに応じた同調用の容量を有するコン
デンサを接続する必要がなく、搭載部品を削減すること
ができる。As described above, since a tuning circuit can be formed only by forming a coil, there is no need to connect a capacitor having a tuning capacity corresponding to the inductance of the antenna coil 1, and the number of mounted components is reduced. can do.
【００１３】[0013]
【発明の効果】本発明によれば、以上説明したように、
応答器のアンテナコイルの巻き始めと巻き終わりにコイ
ルを形成し、この２つのコイルを対向させて寄生容量を
得るように構成したので、同調用コンデンサを接続する
必要がなくなり、曲げや捻じりに強く、信頼性の高い応
答器を実現できる。また、寄生容量がアンテナコイルの
両端に発生するのでアンテナコイルの出力端にコンデン
サが接続されたのと同じ効果をもたらすので、出力効率
を向上させた同調回路が実現できるから、効率よく電源
が得られ、信頼性の高い非接触式データ通信システムを
提供できる。According to the present invention, as described above,
A coil is formed at the beginning and end of winding of the antenna coil of the transponder, and the two coils are opposed to each other to obtain a parasitic capacitance. Therefore, there is no need to connect a tuning capacitor, and bending and twisting can be avoided. A strong and highly reliable transponder can be realized. In addition, since parasitic capacitance is generated at both ends of the antenna coil, the same effect as when a capacitor is connected to the output end of the antenna coil is obtained. As a result, a highly reliable contactless data communication system can be provided.
【図１】カードとしてラミネートする前のアンテナコイ
ルと寄生容量生成用コイルのみの模式図である。FIG. 1 is a schematic diagram showing only an antenna coil and a parasitic capacitance generating coil before being laminated as a card.
【図２】アンテナコイルの動作説明図である。FIG. 2 is an explanatory diagram of an operation of an antenna coil.
１ アンテナコイル ２ 寄生容量生成用コイル ３ 寄生容量 Reference Signs List 1 antenna coil 2 parasitic capacitance generating coil 3 parasitic capacitance
Claims (1)
が得られ、この電力により応答器が動作し、質問器と応
答器間のデータの送受信を可能とする非接触式データ通
信システムにおいて、 前記応答器内に細線を同一平面上に渦巻き状に形成した
アンテナコイルと、 このアンテナコイルの巻き始めと巻き終わりに、それぞ
れ同一平面状に対向して渦巻き状に形成したコイルとを
備え、この対向するコイル間に生じる寄生コンデンサと
前記アンテナコイルとで同調回路を形成し、同調周波数
が前記電磁波の周波数に同調することを特徴とする応答
器の同調回路。1. A non-contact data communication system in which power of a transponder is obtained by electromagnetic waves from an interrogator, the transponder operates by the power, and data can be transmitted and received between the interrogator and the transponder. An antenna coil in which a fine wire is spirally formed on the same plane in the transponder, and a coil formed in a spiral shape opposite to the same plane at the beginning and end of winding of the antenna coil, respectively. A tuning circuit for a transponder, wherein a tuning circuit is formed by a parasitic capacitor generated between opposed coils and the antenna coil, and a tuning frequency is tuned to a frequency of the electromagnetic wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35695799A JP2001177448A (en) | 1999-12-16 | 1999-12-16 | Tuning circuit for responder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35695799A JP2001177448A (en) | 1999-12-16 | 1999-12-16 | Tuning circuit for responder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001177448A true JP2001177448A (en) | 2001-06-29 |
Family
ID=18451636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35695799A Pending JP2001177448A (en) | 1999-12-16 | 1999-12-16 | Tuning circuit for responder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001177448A (en) |
-
1999
- 1999-12-16 JP JP35695799A patent/JP2001177448A/en active Pending
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