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JP4296246B2 - RF-ID transmission / reception system and method - Google Patents
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JP4296246B2 - RF-ID transmission / reception system and method - Google Patents

RF-ID transmission / reception system and method Download PDF

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JP4296246B2
JP4296246B2 JP2004014479A JP2004014479A JP4296246B2 JP 4296246 B2 JP4296246 B2 JP 4296246B2 JP 2004014479 A JP2004014479 A JP 2004014479A JP 2004014479 A JP2004014479 A JP 2004014479A JP 4296246 B2 JP4296246 B2 JP 4296246B2
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紘 松本
真毅 篠原
統 武市
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Kochi Prefectural PUC
Kyoto University NUC
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    • 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
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Description

本発明は、バッテリーを内蔵しないタイプ、すなわち、バッテリーレスタイプのＲＦ−ＩＤ(radio frequency-identifier)を操作するための電磁波の送信及びＲＦ−ＩＤから読み書き用の電磁波の受信を無線通信範囲内で行うＲＦ−ＩＤ送受信システム及び方法に関する。
明細書中、ＲＦ−ＩＤとは、電磁波エネルギーを受信し、そのエネルギーを自己の電力源とする能動的情報機器を意味するものとする。したがって、単に自己の持つ情報を送出するだけの機能のＲＦ−ＩＤだけでなく、音、振動、光等を駆動させる機能を有するもの、温度、気圧等の検知器の情報を取り扱う機能を有するもの、さらには、それらの駆動部及び検知部を能動的に取り扱い、必要な情報だけを送信するものも含まれる。 In the present invention, transmission of electromagnetic waves for operating a battery-less type RF-ID (radio frequency-identifier) and reception of read / write electromagnetic waves from the RF-ID are within a wireless communication range. The present invention relates to an RF-ID transmission / reception system and method.
In the specification, RF-ID means an active information device that receives electromagnetic energy and uses the energy as its own power source. Therefore, not only RF-IDs that simply send out information that they have, but also those that have the ability to drive sound, vibration, light, etc., and those that have the ability to handle detector information such as temperature and pressure Furthermore, those that actively handle these drive units and detection units and transmit only necessary information are also included.

近年開発されたＲＦ−ＩＤは、バーコードに代わる識別子として注目を集めている。現在、その応用が盛んになってきており、書籍の万引き防止、小売店の清算システム、偽札防止、航空貨物等の多様な用途開発が行われている（例えば、非特許文献１〜４参照）。   Recently developed RF-IDs are attracting attention as identifiers to replace bar codes. Currently, its application is becoming popular, and various application developments such as book shoplifting prevention, retail clearing systems, counterfeit bill prevention, air freight, etc. are being carried out (for example, see Non-Patent Documents 1 to 4). .

ＲＦ−ＩＤは、使用周波数帯、読み書き方式、操作距離等の仕様を異にする多種多様なものが開発されている。このＲＦ−ＩＤを大きく分類すると、バッテリーを内蔵するものとバッテリーを内蔵しないものの二つに分類される。   A wide variety of RF-IDs having different specifications such as a used frequency band, a read / write method, and an operation distance have been developed. This RF-ID can be broadly classified into two types: those with a built-in battery and those without a built-in battery.

これらのうち、バッテリーを内蔵しないものは、バッテリー内の水銀などの有害な化学物質を有しないため、環境負荷が少なく、また、バッテリー体積を有しないため、小型軽量化に有利である。そのため、バッテリーを内蔵しないタイプは、バッテリーを内蔵するタイプよりも多く利用され、また、多様な用途開発も行われつつある。   Among these, those without a built-in battery do not have harmful chemical substances such as mercury in the battery, and therefore have a low environmental load and do not have a battery volume, which is advantageous for reduction in size and weight. For this reason, the type without a built-in battery is used more than the type with a built-in battery, and various applications are being developed.

図１は、バッテリーを内蔵しないタイプ、すなわち、バッテリーレスタイプのＲＦ−ＩＤの内部構造を示す図である。このＲＦ−ＩＤは、図示しない読み書き機器との通信を行うとともに電力源となる電磁波を受信するアンテナ１と、信号受信回路２と、信号送信回路３と、記憶回路４と、制御回路５と、高周波整流回路６とを具える。このＲＦ−ＩＤは、アンテナ１に入る高周波エネルギーを高周波整流回路６によって整流して、直流電力を取得することによって動作する。   FIG. 1 is a diagram showing an internal structure of a RF-ID of a type not incorporating a battery, that is, a battery-less type. This RF-ID communicates with a read / write device (not shown) and receives an electromagnetic wave as a power source, a signal reception circuit 2, a signal transmission circuit 3, a storage circuit 4, a control circuit 5, A high-frequency rectifier circuit 6; This RF-ID operates by rectifying high-frequency energy entering the antenna 1 with a high-frequency rectifier circuit 6 and acquiring DC power.

図２は、従来のＲＦ−ＩＤ送受信システムを示す図である。このＲＦ−ＩＤ送受信システムは、バッテリーレスタイプのＲＦ−ＩＤ１１を操作するための電磁波の送信及びＲＦ−ＩＤ１１からの読み書き用の電磁波の受信をアンテナによって行う読み書き機器１２を具える。   FIG. 2 is a diagram illustrating a conventional RF-ID transmission / reception system. This RF-ID transmission / reception system includes a read / write device 12 that performs transmission of electromagnetic waves for operating the battery-less type RF-ID 11 and reception of read / write electromagnetic waves from the RF-ID 11 by an antenna.

読み書き機器１２のアンテナ１３は、ＲＦ−ＩＤ１１を操作するための電磁波（図示せず）の送信及びＲＦ−ＩＤ１１からの読み書き用の電磁波１４の受信の他に、ＲＦ−ＩＤの電力源となる電磁波１５を送信する役割も有する。その結果、これらの電磁波の放射は、同一方向及び範囲となり、ＲＦ−ＩＤの電力源となる電磁波を送信する範囲（電力伝送範囲）は、ＲＦ−ＩＤ１１を操作するための電磁波の送信及びＲＦ−ＩＤ１１からの読み書き用の電磁波の受信範囲（無線通信範囲）内に存在する。
福田朗，”RFIDタグを活用した航空手荷物管理システム実証実験と今後の展開，”月刊バーコード，日本工業出版，pp.1-5，Jan．2002. 後藤浩一，”鉄道自動改札システムにおけるIT，”電子情報通信学会誌，Vol.86 No.5,pp.345-350, May 2003. 寺内信之，他，”ＲＦＩＤを用いたリサイクルシステム，” デンソーテクニカルレビュー Vol.7 No.1, pp.96-103, 2002. 栗原雅, ``特集 ＩＣタグの真実 −実用化への険しい道−,''Nikkei Computer, pp.48-67, 2003.8.11. The antenna 13 of the read / write device 12 transmits an electromagnetic wave (not shown) for operating the RF-ID 11 and receives an electromagnetic wave 14 for reading / writing from the RF-ID 11, and also serves as an RF-ID power source. 15 also has a role to transmit. As a result, the radiation of these electromagnetic waves is in the same direction and range, and the range (power transmission range) for transmitting the electromagnetic wave serving as the RF-ID power source is the transmission of the electromagnetic waves for operating the RF-ID 11 and the RF- It exists within the reception range (wireless communication range) of electromagnetic waves for reading and writing from ID11.
Akira Fukuda, “Air baggage management system demonstration experiment using RFID tags and future development,” Monthly Barcode, Nippon Kogyo Publishing, pp.1-5, Jan. 2002. Koichi Goto, “IT in the automatic ticket gate system,” IEICE Journal, Vol.86 No.5, pp.345-350, May 2003. Nobuyuki Terauchi, et al., “Recycling System Using RFID,” Denso Technical Review Vol.7 No.1, pp.96-103, 2002. Masaru Kurihara, `` Special Feature: The Truth of IC Tags: A Steep Path to Practical Use, '' Nikkei Computer, pp.48-67, 2003.8.11.

従来のＲＦ−ＩＤ送受信システムでは、電力伝送範囲が短い（一般的には２ｍ）ので、ＲＦ−ＩＤ１１の操作範囲が短くなるという不都合がある。したがって、ＲＦ−ＩＤ１１の操作範囲を広げることが所望されている。   In the conventional RF-ID transmission / reception system, since the power transmission range is short (generally 2 m), there is a disadvantage that the operation range of the RF-ID 11 becomes short. Therefore, it is desired to expand the operation range of RF-ID11.

本発明の目的は、他の不都合が生じることなくＲＦ−ＩＤの操作範囲を広げることができるＲＦ−ＩＤ送受信システム及び方法を提供することである。   An object of the present invention is to provide an RF-ID transmission / reception system and method capable of expanding the operation range of RF-ID without causing other inconveniences.

本発明によるＲＦ−ＩＤ送受信システムは、
バッテリーレスタイプのＲＦ−ＩＤを操作するための電磁波の送信及び前記ＲＦ−ＩＤからの読み書き用の電磁波の受信を行う読み書き機器と、
前記ＲＦ−ＩＤに電磁波を放射して電力の伝送を行う少なくとも一つのチャージャーとを具え、
前記読み書き機器による前記読み書き用の電磁波の受信が可能な範囲内に、前記ＲＦ−ＩＤが配置されると、前記読み書き用の電磁波が前記読み書き機器に送信されるようにしたことを特徴とする。 An RF-ID transmission / reception system according to the present invention includes:
A read / write device for transmitting an electromagnetic wave for operating a battery-less type RF-ID and receiving an electromagnetic wave for reading / writing from the RF-ID;
Comprising at least one charger for transmitting electric power by radiating electromagnetic waves to the RF-ID,
The read / write electromagnetic wave is transmitted to the read / write device when the RF-ID is disposed within a range in which the read / write electromagnetic wave can be received by the read / write device.

本発明によるＲＦ−ＩＤ送受信方法は、
バッテリーレスタイプのＲＦ−ＩＤを操作するための電磁波の送信及び前記ＲＦ−ＩＤからの読み書き用の電磁波の受信を行う読み書き機器を用いたＲＦ−ＩＤ送受信方法であって、
前記ＲＦ−ＩＤに電磁波を放射して電力の伝送を行うステップと、
その電力が伝送されたＲＦ−ＩＤが、前記読み書き機器による前記読み書き用の電磁波の受信が可能な範囲内に配置されると、前記読み書き用の電磁波を前記読み書き機器に送信することを特徴とする。 An RF-ID transmission / reception method according to the present invention includes:
An RF-ID transmission / reception method using a read / write device for transmitting an electromagnetic wave for operating a battery-less type RF-ID and receiving an electromagnetic wave for reading / writing from the RF-ID,
Radiating electromagnetic waves to the RF-ID to transmit power;
When the RF-ID to which the power is transmitted is disposed within a range in which the read / write electromagnetic wave can be received by the read / write device, the read / write electromagnetic wave is transmitted to the read / write device. .

本発明によれば、バッテリーレスタイプのＲＦ−ＩＤを操作するための電磁波の送信及び前記ＲＦ−ＩＤからの読み書き用の電磁波の受信を行う読み書き機器を用いたＲＦ−ＩＤ送受信方に際し、ＲＦ−ＩＤに電磁波を放射して電力の伝送を行い、その電力が伝送されたＲＦ−ＩＤが、読み書き機器による読み書き用の電磁波の受信が可能な範囲内に配置されると、読み書き用の電磁波を読み書き機器に送信する。   According to the present invention, in the RF-ID transmission / reception method using the read / write device for transmitting the electromagnetic wave for operating the battery-less type RF-ID and receiving the read / write electromagnetic wave from the RF-ID, When power is transmitted by radiating electromagnetic waves to the ID, and the RF-ID to which the power is transmitted is placed within a range where the electromagnetic waves for reading and writing can be received by the read / write device, the electromagnetic waves for reading and writing are read and written. Send to device.

このようにＲＦ−ＩＤに対する電力の伝送を行うことによって、ＲＦ−ＩＤの操作範囲を、読み書き機器による読み書き用の電磁波の受信が可能な範囲内すなわち無線通信範囲内（一般的には１０ｍ以内）まで広げることができる。   By transmitting power to the RF-ID in this way, the operation range of the RF-ID is within a range in which electromagnetic waves for reading and writing by a read / write device can be received, that is, within a wireless communication range (generally within 10 m). Can be expanded.

好適には、無線通信範囲全体でのＲＦ−ＩＤへの電力の伝送が可能となるように複数のチャージャーを配置する。なお、電磁波として任意の種類の電磁波を使用することができるが、変換効率及び伝送効率の観点からマイクロ波を使用するのが好適である。   Preferably, a plurality of chargers are arranged so that power can be transmitted to the RF-ID over the entire wireless communication range. Note that any type of electromagnetic wave can be used as the electromagnetic wave, but it is preferable to use a microwave in terms of conversion efficiency and transmission efficiency.

また、ＲＦ−ＩＤに放射される電磁波をパルス波で構成した場合、電力の伝送範囲を一様にするという観点から好適であり、ＲＦ−ＩＤに放射される電磁波を連続波で構成した場合、電力の伝送距離を長くするという観点から好適である。   Further, when the electromagnetic wave radiated to the RF-ID is configured with a pulse wave, it is preferable from the viewpoint of making the transmission range of power uniform, and when the electromagnetic wave radiated to the RF-ID is configured with a continuous wave, This is preferable from the viewpoint of increasing the power transmission distance.

本発明によるＲＦ−ＩＤ送受信システム及び方法の実施の形態を、図面を参照して詳細に説明する。
図３は、本発明によるＲＦ−ＩＤ送受信システムを示す図である。このＲＦ−ＩＤ送受信システムは、読み書き装置１１の他に、ＲＦ−ＩＤに電磁波（例えば、マイクロ波）を放射して電力の伝送を行うチャージャー１６，１７を具える。なお、読み書き機器１１のアンテナ１３及びチャージャー１６，１７のアンテナ１８，１９をそれぞれ、半波長ダイポールアンテナとする。 Embodiments of an RF-ID transmission / reception system and method according to the present invention will be described in detail with reference to the drawings.
FIG. 3 is a diagram illustrating an RF-ID transmission / reception system according to the present invention. In addition to the read / write device 11, the RF-ID transmission / reception system includes chargers 16 and 17 that transmit electric power by radiating electromagnetic waves (for example, microwaves) to the RF-ID. The antenna 13 of the read / write device 11 and the antennas 18 and 19 of the chargers 16 and 17 are respectively half-wave dipole antennas.

本実施の形態の動作を説明する。ＲＦ−ＩＤ２０，２１がチャージャー１６の電力伝送範囲内に入ると、チャージャー１６は、ＲＦ−ＩＤ２０，２１に電磁波を放射して電力の伝送を行う。電力が伝送されたＲＦ−ＩＤ２０は、読み書き機器１１の無線通信範囲内に配置されている。その結果、ＲＦ−ＩＤ２０は、読み書き用の電磁波２２を読み書き機器１１に送信する。それに対して、電力が供給されたＲＦ−ＩＤ２１は、読み書き機器１１の無線通信範囲外にある。その結果、ＲＦ−ＩＤ２１は、電力源が確保されているために待機状態にあり、読み書き機器１１の無線通信範囲内に入ると読み書き用の電磁波を読み書き機器１１に送信する。   The operation of this embodiment will be described. When the RF-IDs 20 and 21 are within the power transmission range of the charger 16, the charger 16 radiates electromagnetic waves to the RF-IDs 20 and 21 to transmit power. The RF-ID 20 to which power is transmitted is disposed within the wireless communication range of the read / write device 11. As a result, the RF-ID 20 transmits the read / write electromagnetic wave 22 to the read / write device 11. On the other hand, the RF-ID 21 to which power is supplied is outside the wireless communication range of the read / write device 11. As a result, the RF-ID 21 is in a standby state because a power source is secured, and transmits a read / write electromagnetic wave to the read / write device 11 when entering the wireless communication range of the read / write device 11.

本実施の形態によれば、チャージャーによるＲＦ−ＩＤに対する電力の伝送を行うことによって、ＲＦ−ＩＤの操作範囲を、読み書き機器１１による無線通信範囲内まで広げることができる。   According to the present embodiment, by transmitting power to the RF-ID by the charger, the RF-ID operation range can be expanded to the wireless communication range by the read / write device 11.

図４は、パルス波又は連続波によって構成した電磁波をチャージャー列から放射したときの２５ｃｍ、５０ｃｍ、７０ｃｍ及び１００ｃｍ離れた位置の平均受信電力を示す図である。この場合、各チャージャーからの出力を５０ｍWとし、３ｍ幅の廊下に適用するものとする。図４において、０ｄBを、１個のチャージャーから２５ｃｍ離れた位置で得られる平均受信電力とし、廊下中央を零とした±１．５ｍの範囲（廊下幅３ｍ）の受信電力を示す。   FIG. 4 is a diagram showing average received power at positions 25 cm, 50 cm, 70 cm and 100 cm apart when an electromagnetic wave constituted by a pulse wave or a continuous wave is radiated from the charger array. In this case, the output from each charger is 50 mW, and it is applied to a 3 m wide corridor. In FIG. 4, 0 dB is the average received power obtained at a position 25 cm away from one charger, and the received power in a range of ± 1.5 m (corridor width 3 m) with the center of the corridor being zero is shown.

図４に示すように、パルス波の場合にはチャージャーから７０ｃｍ以内又は連続波の場合にはチャージャーから１００ｃｍ以内である場合、電力を伝送可能な箇所が点在する。ここで、安定した電力の供給（伝送）が行われる２５ｃｍ及び５０ｃｍ離れた位置について、パルス波と連続波の各々の０ｄＢを超える範囲を積算して両者の長さを比較すると、次の結果が得られる。
（１）２５ｃｍ離れた位置では、幅３ｍのうちパルス幅は約２．１ｍであり、連続波は約１．４ｍとなる。
（２）５０ｃｍ離れた位置では、幅３ｍのうちパルス幅は約０．７ｍであり、連続波は約１．４ｍとなる。 As shown in FIG. 4, in the case of a pulse wave, within 70 cm from the charger, or in the case of a continuous wave, within 100 cm from the charger, there are scattered points where power can be transmitted. Here, for the positions 25 cm and 50 cm apart where stable power supply (transmission) is performed, the ranges exceeding 0 dB of each of the pulse wave and continuous wave are integrated and the lengths of both are compared, and the following results are obtained. can get.
(1) At a position 25 cm away, the pulse width is about 2.1 m out of the width 3 m, and the continuous wave is about 1.4 m.
(2) At a position 50 cm away, the pulse width is about 0.7 m out of the width 3 m, and the continuous wave is about 1.4 m.

したがって、パルス波の場合には、チャージャーに近づくに従って電力の供給可能な領域が広がるので、電力の伝送範囲を一様にするという観点から好適である。それに対して、連続波の場合、供給距離を長くすることができるので、電力の伝送距離を長くするという観点から好適である。   Therefore, in the case of a pulse wave, an area where power can be supplied increases as it approaches the charger, which is preferable from the viewpoint of making the power transmission range uniform. On the other hand, in the case of continuous waves, the supply distance can be increased, which is preferable from the viewpoint of increasing the power transmission distance.

本発明は、上記実施の形態に限定されるものではなく、幾多の変更及び変形が可能である。
例えば、バッテリーレスタイプのＲＦ−ＩＤを操作するための電磁波の送信及びＲＦ−ＩＤからの読み書き用の電磁波の受信を行うとともにＲＦ−ＩＤに電磁波を放射して電力の伝送を行う読み書き機器について説明したが、バッテリーレスタイプのＲＦ−ＩＤを操作するための電磁波の送信及びＲＦ−ＩＤからの読み書き用の電磁波の受信のみを行う読み書き機器を用いることもできる。 The present invention is not limited to the above-described embodiment, and many changes and modifications can be made.
For example, a read / write device that transmits an electromagnetic wave for operating a battery-less RF-ID and receives an electromagnetic wave for reading / writing from the RF-ID and radiates the electromagnetic wave to the RF-ID to transmit power is described. However, it is also possible to use a read / write device that only transmits electromagnetic waves for operating battery-less RF-IDs and receives read / write electromagnetic waves from RF-IDs.

また、チャージャーの個数及び配置を任意に選択することができ、読み書き装置及びチャージャーのアンテナを、半波長ダイポールアンテナ以外の任意の種類のアンテナ（例えば、マイクロストリップアンテナ）を用いることができる。さらに、電磁波の波長を、マイクロ波の波長範囲以外の任意の範囲でも選択することができる。   Further, the number and arrangement of the chargers can be arbitrarily selected, and any type of antenna (for example, a microstrip antenna) other than the half-wave dipole antenna can be used as the read / write device and the charger antenna. Further, the wavelength of the electromagnetic wave can be selected in an arbitrary range other than the microwave wavelength range.

バッテリーレスタイプのＲＦ−ＩＤの内部構造を示す図である。It is a figure which shows the internal structure of battery-less type RF-ID. 従来のＲＦ−ＩＤ送受信システムを示す図である。It is a figure which shows the conventional RF-ID transmission / reception system. 本発明によるＲＦ−ＩＤ送受信システムを示す図である。It is a figure which shows the RF-ID transmission / reception system by this invention. パルス波又は連続波によって構成した電磁波をチャージャー列から放射したときの２５ｃｍ、５０ｃｍ、７０ｃｍ及び１００ｃｍ離れた位置の平均受信電力を示す図である。It is a figure which shows the average received power of the position 25 cm, 50 cm, 70 cm, and 100 cm away when the electromagnetic wave comprised by the pulse wave or the continuous wave was radiated | emitted from the charger row | line | column.

符号の説明Explanation of symbols

１ アンテナ
２ 信号受信回路
３ 信号送信回路
４ 記憶回路
５ 制御回路
６ 高周波整流回路
１１，２０，２１ ＲＦ−ＩＤ
１２ 読み書き機器
１３，１８，１９ アンテナ
１４，１５，２２ 電磁波
１６，１７ チャージャー DESCRIPTION OF SYMBOLS 1 Antenna 2 Signal receiving circuit 3 Signal transmission circuit 4 Memory circuit 5 Control circuit 6 High frequency rectifier circuit 11, 20, 21 RF-ID
12 Reading / writing device 13, 18, 19 Antenna 14, 15, 22 Electromagnetic wave 16, 17 Charger

Claims (8)

バッテリーレスタイプのＲＦ−ＩＤを操作するための電磁波の送信及び前記ＲＦ−ＩＤからの読み書き用の電磁波の受信を無線通信範囲内で行うと共に、前記ＲＦ−ＩＤが動作するための電力源となる電磁波を前記無線通信範囲よりも狭い電力伝送範囲内に放射する読み書き機器と、
前記ＲＦ−ＩＤが動作するための電力源となる電磁波を放射して、前記ＲＦ−ＩＤに対して電力の伝送を行う少なくとも一つのチャージャーとを具え、
前記無線通信範囲内に前記ＲＦ−ＩＤが配置されると、前記読み書き用の電磁波を前記読み書き機器に送信することを特徴とするＲＦ−ＩＤ送受信システム。 Transmission of electromagnetic waves for operating a battery-less type RF-ID and reception of electromagnetic waves for reading and writing from the RF-ID within a wireless communication range and a power source for operating the RF-ID Read / write equipment that radiates electromagnetic waves within a power transmission range narrower than the wireless communication range ;
Including at least one charger that radiates an electromagnetic wave serving as a power source for operating the RF-ID and transmits power to the RF-ID ;
When the RF-ID is disposed within the wireless communication range, the RF-ID transmission / reception system transmits the read / write electromagnetic wave to the read / write device. 前記電磁波をマイクロ波としたことを特徴とする請求項１記載のＲＦ−ＩＤ送受信システム。   The RF-ID transmission / reception system according to claim 1, wherein the electromagnetic wave is a microwave. 前記ＲＦ−ＩＤに放射される電磁波を連続波によって構成したことを特徴とする請求項１記載のＲＦ−ＩＤ送受信システム。   2. The RF-ID transmission / reception system according to claim 1, wherein the electromagnetic wave radiated to the RF-ID is constituted by a continuous wave. 前記ＲＦ−ＩＤに放射される電磁波をパルス波によって構成したことを特徴とする請求項１記載のＲＦ−ＩＤ送受信システム。   The RF-ID transmission / reception system according to claim 1, wherein the electromagnetic wave radiated to the RF-ID is configured by a pulse wave. バッテリーレスタイプのＲＦ−ＩＤを操作するための電磁波の送信及び前記ＲＦ−ＩＤからの読み書き用の電磁波の受信を無線通信範囲内で行うと共に、前記ＲＦ−ＩＤが動作するための電力源となる電磁波を前記無線通信範囲よりも狭い電力伝送範囲内に放射する読み書き機器を用いたＲＦ−ＩＤ送受信方法であって、
前記ＲＦ−ＩＤが動作するための電力源となる電磁波を放射して、前記ＲＦ−ＩＤに対して電力の伝送を行うステップと、
その電力が伝送されたＲＦ−ＩＤが、前記読み書き機器による前記読み書き用の電磁波の受信が可能な範囲内に配置されると、前記読み書き用の電磁波を前記読み書き機器に送信することを特徴とするＲＦ−ＩＤ送受信方法。 Transmission of electromagnetic waves for operating a battery-less type RF-ID and reception of electromagnetic waves for reading and writing from the RF-ID within a wireless communication range and a power source for operating the RF-ID An RF-ID transmission / reception method using a read / write device that radiates electromagnetic waves into a power transmission range narrower than the wireless communication range ,
Radiating an electromagnetic wave serving as a power source for operating the RF-ID to transmit power to the RF-ID ;
When the RF-ID to which the power is transmitted is disposed within a range in which the read / write electromagnetic wave can be received by the read / write device, the read / write electromagnetic wave is transmitted to the read / write device. RF-ID transmission / reception method. 前記ＲＦ−ＩＤに放射される電磁波をマイクロ波としたことを特徴とする請求項５記載のＲＦ−ＩＤ送受信方法。   6. The RF-ID transmission / reception method according to claim 5, wherein the electromagnetic wave radiated to the RF-ID is a microwave. 前記ＲＦ−ＩＤに放射される電磁波を連続波によって構成したことを特徴とする請求項５記載のＲＦ−ＩＤ送受信方法。   6. The RF-ID transmission / reception method according to claim 5, wherein the electromagnetic wave radiated to the RF-ID is constituted by a continuous wave. 前記ＲＦ−ＩＤに放射される電磁波をパルス波によって構成したことを特徴とする請求項５記載のＲＦ−ＩＤ送受信方法。   6. The RF-ID transmission / reception method according to claim 5, wherein the electromagnetic wave radiated to the RF-ID is constituted by a pulse wave.
JP2004014479A 2004-01-22 2004-01-22 RF-ID transmission / reception system and method Expired - Fee Related JP4296246B2 (en)

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