JP4807029B2 - RFID system and RFID tag - Google Patents

RFID system and RFID tag Download PDF

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JP4807029B2
JP4807029B2 JP2005293625A JP2005293625A JP4807029B2 JP 4807029 B2 JP4807029 B2 JP 4807029B2 JP 2005293625 A JP2005293625 A JP 2005293625A JP 2005293625 A JP2005293625 A JP 2005293625A JP 4807029 B2 JP4807029 B2 JP 4807029B2
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frequency
switching
command signal
transmission wave
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JP2007102621A (en
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出 内藤
典生 梅村
憲治 末松
昌孝 大塚
敏久 亀丸
伸一郎 渡邉
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Mitsubishi Electric Corp
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この発明は、Ｒａｄｉｏ Ｆｒｅｑｕｅｎｃｙ Ｉｄｅｎｔｉｆｉｃａｔｉｏｎ（以下、ＲＦＩＤと称す）リーダライタから送信されるコマンド信号をＲＦＩＤタグが受信し、そのコマンド信号の情報に応じてＲＦＩＤタグ内のメモリに格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤタグが前記ＲＦＩＤリーダライタに読み出し信号として送信し、生体・物品の入退室管理や物流管理などに利用されるＲＦＩＤシステム及びそれに用いるＲＦＩＤタグに関するものである。 In the present invention, the RFID tag receives a command signal transmitted from a radio frequency identification (hereinafter referred to as RFID) reader / writer, and the tag information stored in the memory in the RFID tag is determined according to the information of the command signal. The present invention relates to an RFID system used for biometric / article entry / exit management, physical distribution management, and the like, and an RFID tag used for the update / rewrite or tag information transmitted from the RFID tag as a read signal to the RFID reader / writer. .

従来、ＲＦＩＤシステムは、無線通信システム（ＲＦＩＤリーダライタ）の複数の受信アンテナを直列に接続することにより、非接触通信媒体（ＲＦＩＤタグ）からの送信電磁波（読み出し信号）の受信範囲を拡大することができるとともに、夫々の受信アンテナにトランスを接続することによりノイズを低減するものがある（例えば、特許文献１参照）。また、リーダライタから送信された質問信号としての電磁波が、非接触ＩＣカード（ＲＦＩＤタグ）回路により受信されると、受信された電磁波に対応する電気信号が整流回路に供給され、受信した電気信号を整流平滑し、ＨＰＦ（ハイパスフィルタ）に供給し、ＨＰＦは、供給された正のレベルの電圧から、高域成分を排除して、復調回路に供給するものがある（例えば、特許文献２参照）。   Conventionally, an RFID system expands the reception range of a transmission electromagnetic wave (read signal) from a non-contact communication medium (RFID tag) by connecting a plurality of receiving antennas of a wireless communication system (RFID reader / writer) in series. In addition, there is one that reduces noise by connecting a transformer to each receiving antenna (see, for example, Patent Document 1). When an electromagnetic wave as an interrogation signal transmitted from a reader / writer is received by a non-contact IC card (RFID tag) circuit, an electric signal corresponding to the received electromagnetic wave is supplied to the rectifier circuit, and the received electric signal Is rectified and smoothed and supplied to an HPF (high-pass filter). The HPF removes a high-frequency component from the supplied positive level voltage and supplies it to a demodulation circuit (see, for example, Patent Document 2). ).

特開２０００−２８５２０８号公報（第２図）JP 2000-285208 A (FIG. 2)

特開２００５−９２３５２号公報（第５図）Japanese Patent Laying-Open No. 2005-92352 (FIG. 5)

しかし、特許文献１に記載の従来技術は、ＲＦＩＤリーダライタの受信時のノイズを軽減して、広域な送信エリアを確保する発明であり、特許文献２に記載の従来技術は、電流回路（整流回路）から供給された正のレベルの電圧から高域成分を排除する発明であるので、ＲＦＩＤシステム使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していると、感度抑圧などの影響を受け、ＲＦＩＤリーダライタからコマンド信号がＲＦＩＤタグで受信・復調ができない可能性があるという課題があった。ちなみに、日本国におけるＲＦＩＤシステムが割り当てられる予定のＵＨＦ帯では、周波数帯が携帯電話の周波数帯の近傍であり、ＲＦＩＤシステムが動作をしている近傍で、携帯電話からの大電力の送信電波では送信されると、上記のような感度抑圧が生じる可能性がある。また、ＲＦＩＤタグを物品に付けて、物品の物流管理にＲＦＩＤシステムが利用されているが、物流が一国、又は一地域だけでなく、多くの国や地域に渡る場合は、それら多くの国や地域でのＲＦＩＤシステム使用周波数等の規格が異なる場合が多く、多くの国・地域での同じＲＦＩＤタグを使用できないという課題もあった。   However, the prior art described in Patent Document 1 is an invention that secures a wide transmission area by reducing noise at the time of reception by the RFID reader / writer, and the prior art described in Patent Document 2 is a current circuit (rectifier). Circuit), a high-frequency component is excluded from a positive level voltage supplied from a circuit). Therefore, if a wireless communication device using a band near the frequency used by the RFID system emits a high-power transmission radio wave, the sensitivity There is a problem that a command signal from the RFID reader / writer may not be received or demodulated by the RFID tag due to the influence of suppression or the like. By the way, in the UHF band to which the RFID system in Japan will be allocated, the frequency band is in the vicinity of the frequency band of the mobile phone, and in the vicinity where the RFID system is operating, When transmitted, sensitivity suppression as described above may occur. In addition, RFID tags are attached to goods and the RFID system is used to manage the logistics of goods. However, if the logistics is not limited to one country or one region, but many countries or regions, those many countries In many cases, standards such as the frequency used for the RFID system in different regions are different, and the same RFID tag cannot be used in many countries / regions.

この発明は、上記のような課題を解消するためになされたもので、ＲＦＩＤシステム使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出している場合でも、その送信電波による感度抑圧を受けずに、ＲＦＩＤリーダライタからのコマンド信号をＲＦＩＤタグで受信・復調できるＲＦＩＤシステムを提供することを目的とする。   The present invention has been made to solve the above-described problems. Even when a wireless communication device using a band in the vicinity of the RFID system use frequency emits a high-power transmission radio wave, An object of the present invention is to provide an RFID system that can receive and demodulate a command signal from an RFID reader / writer with an RFID tag without being subjected to sensitivity suppression.

請求項１の発明に係るＲＦＩＤシステムは、ＲＦＩＤリーダライタから送信されるコマンド信号である送信波をＲＦＩＤタグが受信し、その送信波のコマンド信号により前記ＲＦＩＤタグ内のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤタグが前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤシステムにおいて、前記送信波と周波数が異なる電波を送信する手段であって、前記ＲＦＩＤタグが受信する前記送信波の周波数帯を前記ＲＦＩＤタグに切替させるために、切替後送信波の周波数情報である周波数設定コマンド信号を周波数設定波として前記ＲＦＩＤタグへ送信する周波数設定波送信手段と、前記ＲＦＩＤタグに設けられ、前記送信波を含む到来電波を受信する第１のアンテナ部と、前記ＲＦＩＤタグに設けられ、前記周波数設定波を受信する第２のアンテナ部と、この第２のアンテナ部が受信した前記周波数設定波を復調し、前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記第１のアンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に設定し、前記切替後送信波以外の周波数帯を阻止帯に設定するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたことを特徴とするものである。 In the RFID system according to claim 1, the RFID tag receives a transmission wave, which is a command signal transmitted from the RFID reader / writer, and is stored in the memory unit in the RFID tag by the command signal of the transmission wave. In the RFID system in which tag information is updated / rewritten, or the RFID tag transmits a return wave as a read signal to the RFID reader / writer, the tag information is means for transmitting a radio wave having a frequency different from that of the transmission wave, Frequency setting wave transmitting means for transmitting a frequency setting command signal, which is frequency information of the transmission wave after switching, to the RFID tag as a frequency setting wave in order to switch the frequency band of the transmission wave received by the RFID tag to the RFID tag. And receiving the incoming radio wave including the transmission wave provided on the RFID tag. 1 antenna unit, a second antenna unit provided in the RFID tag, for receiving the frequency setting wave, and demodulating the frequency setting wave received by the second antenna unit, from the frequency setting command signal A frequency setting circuit for generating a frequency switching signal, and a passband of an incoming radio wave received by the first antenna unit based on the frequency switching signal from a frequency band of the transmission wave to a frequency band of the post-switching transmission wave set, a filter unit for setting a frequency band other than the transmission after the switching wave stopband, a demodulation circuit for demodulating a command signal of the after-switching transmission wave filtered from the incoming waves by the filter unit, a demodulation A control circuit for instructing one or both of updating / rewriting and reading of the tag information to the memory unit from the command signal received, and the control circuit It is characterized in that a modulation circuit for modulating the read signal the memory unit is outputted by the instruction reply wave.

請求項２の発明に係るＲＦＩＤシステムは、前記周波数設定波送信手段は、前記ＲＦＩＤリーダライタに設けられるものである請求項１に記載のものである。 The RFID system according to a second aspect of the present invention is the RFID system according to the first aspect, wherein the frequency setting wave transmitting means is provided in the RFID reader / writer .

請求項３の発明に係るＲＦＩＤタグは、ＲＦＩＤリーダライタから送信されるコマンド信号である送信波を受信し、その送信波のコマンド信号により内部のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤタグにおいて、前記送信波を含む到来電波を受信する第１のアンテナ部と、前記送信波と周波数が異なる電波であって、受信する前記送信波の周波数帯を切替るための、切替後送信波の周波数情報である周波数設定コマンド信号を周波数設定波として受信する第２のアンテナ部と、この第２のアンテナ部が受信した前記周波数設定波を復調し、前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記第１のアンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に設定し、前記切替後送信波以外の周波数帯を阻止帯に設定するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたことを特徴とするものである。 The RFID tag according to the invention of claim 3 receives a transmission wave which is a command signal transmitted from the RFID reader / writer, and updates / rewrites tag information stored in an internal memory unit by the command signal of the transmission wave. In the RFID tag that transmits a return wave as a read signal to the RFID reader / writer with the tag information as a read signal, the first antenna unit that receives an incoming radio wave including the transmission wave is a radio wave having a frequency different from that of the transmission wave. A second antenna unit that receives a frequency setting command signal, which is frequency information of the transmission wave after switching, for switching the frequency band of the transmission wave to be received, and the second antenna unit A frequency setting circuit that demodulates the received frequency setting wave and generates a frequency switching signal from the frequency setting command signal; and Based on the switching signal, said pass band of the first incoming wave to the antenna unit receives sets the frequency band of the transmission wave frequency band of the post-switching transmission wave, a frequency band other than the post-switching transmission wave A filter unit for setting the signal to the stop band, a demodulation circuit for demodulating the command signal of the post-switching transmission wave filtered from the incoming radio wave by the filter unit, and the tag information from the demodulated command signal to the memory unit A control circuit for instructing one or both of update / rewrite and reading, and a modulation circuit for modulating a read signal output from the memory unit according to an instruction of the control circuit into a return wave It is a feature.

請求項４の発明に係るＲＦＩＤシステムは、ＲＦＩＤリーダライタから送信されるコマンド信号である送信波をＲＦＩＤタグが受信し、その送信波のコマンド信号により前記ＲＦＩＤタグ内のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤタグが前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤシステムにおいて、前記送信波の周波数が切替る前に前記コマンド信号に切替後の切替後送信波の周波数情報である周波数設定コマンド信号が含まれている場合であって、前記送信波又は前記切替後送信波を含む到来電波を受信するアンテナ部と、このアンテナ部が受信した前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記アンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に変更し、前記切替後送信波以外の周波数帯を阻止帯に変更するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたことを特徴とするものである。
請求項５の発明に係るＲＦＩＤタグは、ＲＦＩＤリーダライタから送信されるコマンド信号である送信波を受信し、その送信波のコマンド信号により内部のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤタグにおいて、前記送信波の周波数が切替る前に前記コマンド信号に切替後の切替後送信波の周波数情報である周波数設定コマンド信号が含まれている場合であって、前記送信波又は前記切替後送信波を含む到来電波を受信するアンテナ部と、このアンテナ部が受信した前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記アンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に変更し、前記切替後送信波以外の周波数帯を阻止帯に変更するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたことを特徴とするものである。
According to a fourth aspect of the present invention, the RFID system receives a transmission wave, which is a command signal transmitted from the RFID reader / writer, and stores the transmission wave in a memory unit in the RFID tag by the command signal of the transmission wave. In an RFID system in which tag information is updated or rewritten, or the RFID tag transmits a return wave as a read signal to the RFID reader / writer, the tag information is switched to the command signal before the frequency of the transmission wave is switched. When a frequency setting command signal that is frequency information of a transmission wave after switching is included, the antenna unit that receives the transmission wave or an incoming radio wave including the transmission wave after switching, and the antenna unit that the antenna unit has received a frequency setting circuit for generating a frequency switching signal from the frequency setting command signal, based on the frequency switching signal There are, filter changes the pass band of the incoming radio waves the antenna unit receives, to change the frequency band of the transmission wave frequency band of the post-switching transmission wave, a frequency band other than the transmission after the switching wave stopband A demodulating circuit for demodulating the command signal of the post-switching transmission wave filtered from the incoming radio wave by the filter unit, and updating, rewriting and reading the tag information from the demodulated command signal to the memory unit And a modulation circuit that modulates a read signal output from the memory unit in response to an instruction from the control circuit into a return wave.
The RFID tag according to the invention of claim 5 receives a transmission wave which is a command signal transmitted from the RFID reader / writer, and updates / rewrites tag information stored in an internal memory unit by the command signal of the transmission wave. In the RFID tag that transmits a return wave using the tag information as a read signal to the RFID reader / writer, the frequency that is the frequency information of the transmission wave after switching after switching to the command signal before the frequency of the transmission wave is switched When a setting command signal is included, an antenna unit that receives an incoming radio wave including the transmission wave or the transmission wave after switching, and a frequency switching signal is generated from the frequency setting command signal received by the antenna unit a frequency setting circuit for, on the basis of the frequency switching signal, the pass band of the incoming radio waves the antenna unit receives, before Change from the frequency band of the transmitted wave to the frequency band of the post-switching transmission wave, a filter unit for changing the frequency band other than the transmission after the switching wave stopband, the switch which has been filtered from the incoming waves by the filter portion A demodulating circuit for demodulating a command signal of a post-transmission wave, a control circuit for instructing one or both of update / rewrite and reading of the tag information to the memory unit from the demodulated command signal; and And a modulation circuit that modulates a read signal output from the memory unit into a return wave in accordance with an instruction from the control circuit.

以上のように、請求項１に係る発明によれば、アンテナ部が受信したＲＦＩＤリーダライタの送信波を含む到来電波のうち、送信波の周波数帯が通過帯、前記送信波以外の周波数帯が阻止帯であるフィルタ部をＲＦＩＤタグに設けたので、ＲＦＩＤシステム使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。また、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤシステム使用周波数が異なる国や地域のＲＦＩＤタグ使用や使用周波数の再設定ができ、ＲＦＩＤシステムの使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。さらに、周波数設定波送信手段を設けたことにより、ＲＦＩＤタグに送信波と異なる周波数で、ＲＦＩＤシステムの使用周波数情報である周波数設定コマンド信号を送信して、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤタグが周波数設定波送信手段の送信エリア内に存在すれば、自動的にＲＦＩＤシステム使用周波数が異なる国や地域のＲＦＩＤタグ使用や使用周波数の再設定ができるＲＦＩＤシステムを得ることができる。 As described above, according to the first aspect of the present invention, among the incoming radio waves including the transmission wave of the RFID reader / writer received by the antenna unit, the frequency band of the transmission wave is the pass band, and the frequency band other than the transmission wave is Since the filter unit, which is a stop band, is provided in the RFID tag, an RFID system that is not subjected to sensitivity suppression even when a wireless communication device that uses a band near the RFID system use frequency emits a high-power transmission wave is obtained. Can do. In addition, since the frequency band between the pass band and the stop band of the filter unit can be changed, it is possible to use RFID tags in countries and regions where the RFID system use frequency is different and to reset the use frequency, and in the vicinity of the use frequency of the RFID system. Even when a wireless communication device using a device emits a high-power transmission radio wave, an RFID system that is not subjected to sensitivity suppression can be obtained. Further, by providing the frequency setting wave transmitting means, the RFID tag transmits a frequency setting command signal that is used frequency information of the RFID system at a frequency different from that of the transmission wave, so that the pass band and the stop band of the filter unit are transmitted. Since the frequency band can be changed, if the RFID tag exists in the transmission area of the frequency setting wave transmission means, the RFID system can automatically use the RFID tag in a country or region where the RFID system use frequency is different and reset the use frequency. Can be obtained.

請求項２に係る発明によれば、アンテナ部が受信したＲＦＩＤリーダライタの送信波を含む到来電波のうち、送信波の周波数帯が通過帯、前記送信波以外の周波数帯が阻止帯であるフィルタ部をＲＦＩＤタグに設けたので、ＲＦＩＤシステム使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。また、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤシステム使用周波数が異なる国や地域のＲＦＩＤタグ使用や使用周波数の再設定ができ、ＲＦＩＤシステムの使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。さらに、周波数設定波送信手段を設けたことにより、ＲＦＩＤタグに送信波と異なる周波数で、ＲＦＩＤシステムの使用周波数情報である周波数設定コマンド信号を送信して、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤタグがＲＦＩＤリーダライタの送信エリア内に存在すれば、自動的にＲＦＩＤシステム使用周波数が異なる国や地域のＲＦＩＤタグ使用や使用周波数の再設定ができるＲＦＩＤシステムを得ることができる。 According to the second aspect of the invention, among the incoming radio waves including the transmission wave of the RFID reader / writer received by the antenna unit, the frequency band of the transmission wave is a pass band, and the frequency band other than the transmission wave is a stop band Since the RFID tag is provided in the RFID tag, it is possible to obtain an RFID system that is not subjected to sensitivity suppression even when a wireless communication device using a band near the RFID system use frequency emits a high-power transmission radio wave. In addition, since the frequency band between the pass band and the stop band of the filter unit can be changed, it is possible to use RFID tags in countries and regions where the RFID system use frequency is different and to reset the use frequency, and in the vicinity of the use frequency of the RFID system. Even when a wireless communication device using a device emits a high-power transmission radio wave, an RFID system that is not subjected to sensitivity suppression can be obtained. Further, by providing the frequency setting wave transmitting means, the RFID tag transmits a frequency setting command signal that is used frequency information of the RFID system at a frequency different from that of the transmission wave, so that the pass band and the stop band of the filter unit are transmitted. Since the frequency band can be changed, if the RFID tag exists in the transmission area of the RFID reader / writer, an RFID system that can automatically use and reset the RFID tag in a country or region where the RFID system usage frequency is different is obtained. be able to.

請求項３に係る発明によれば、アンテナ部が受信したＲＦＩＤリーダライタの送信波を含む到来電波のうち、送信波の周波数帯が通過帯、前記送信波以外の周波数帯が阻止帯であるフィルタ部を設けたので、ＲＦＩＤシステム使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤタグを得ることができる。また、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤシステム使用周波数が異なる国や地域のＲＦＩＤタグ使用や使用周波数の再設定ができ、ＲＦＩＤシステムの使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤタグを得ることができる。さらに、送信波と異なる周波数で、ＲＦＩＤシステムの使用周波数情報である周波数設定コマンド信号を受信して、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、自動的にＲＦＩＤシステム使用周波数が異なる国や地域の使用や使用周波数の再設定ができるＲＦＩＤタグを得ることができる。 According to the third aspect of the invention, among the incoming radio waves including the transmission wave of the RFID reader / writer received by the antenna unit, the frequency band of the transmission wave is a pass band, and the frequency band other than the transmission wave is a stop band Since the wireless communication device using a band near the RFID system use frequency emits a high-power transmission radio wave, an RFID tag that is not subjected to sensitivity suppression can be obtained. In addition, since the frequency band between the pass band and the stop band of the filter unit can be changed, it is possible to use RFID tags in countries and regions where the RFID system use frequency is different and to reset the use frequency, and in the vicinity of the use frequency of the RFID system. Even when a wireless communication device using the device emits a high-power transmission radio wave, an RFID tag that is not subjected to sensitivity suppression can be obtained. Furthermore, the frequency setting command signal, which is the frequency information used by the RFID system, can be received at a frequency different from the transmission wave, and the frequency band between the pass band and the stop band of the filter unit can be changed. RFID tags that can be used in different countries or regions and can be reset to use frequencies can be obtained.

請求項４に係る発明によれば、アンテナ部が受信したＲＦＩＤリーダライタの送信波を含む到来電波のうち、送信波の周波数帯が通過帯、前記送信波以外の周波数帯が阻止帯であるフィルタ部をＲＦＩＤタグに設けたので、ＲＦＩＤシステム使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。また、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤシステム使用周波数が異なる国や地域のＲＦＩＤタグ使用や使用周波数の再設定ができ、ＲＦＩＤシステムの使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。さらに、送信波の周波数の切替前にコマンド信号に切替後の切替後送信波の周波数情報である周波数設定コマンド信号を載せることにより、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤタグがＲＦＩＤシステムに周波数設定波送信手段が存在しないＲＦＩＤシステムの使用周波数が異なる国や地域に持ち込まれてもＲＦＩＤタグを使用できるＲＦＩＤシステムを得ることができる。
請求項５に係る発明によれば、アンテナ部が受信したＲＦＩＤリーダライタの送信波を含む到来電波のうち、送信波の周波数帯が通過帯、前記送信波以外の周波数帯が阻止帯であるフィルタ部を設けたので、ＲＦＩＤシステム使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤタグを得ることができる。また、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤシステム使用周波数が異なる国や地域のＲＦＩＤタグ使用や使用周波数の再設定ができ、ＲＦＩＤシステムの使用周波数の近傍の帯域を使用する無線通信機器が大電力の送信電波を出していても、感度抑圧を受けないＲＦＩＤタグを得ることができる。さらに、送信波の周波数の切替前にコマンド信号に切替後の切替後送信波の周波数情報である周波数設定コマンド信号により、フィルタ部の通過帯と阻止帯との周波数帯が変更できるので、ＲＦＩＤシステムに周波数設定波送信手段が存在しないＲＦＩＤシステムの使用周波数が異なる国や地域に持ち込まれても使用できるＲＦＩＤタグを得ることができる。 According to the fourth aspect of the present invention, among the incoming radio waves including the transmission wave of the RFID reader / writer received by the antenna unit, the frequency band of the transmission wave is a pass band, and the frequency band other than the transmission wave is a stop band Since the RFID tag is provided in the RFID tag, it is possible to obtain an RFID system that is not subjected to sensitivity suppression even when a wireless communication device using a band near the RFID system use frequency emits a high-power transmission radio wave. In addition, since the frequency band between the pass band and the stop band of the filter unit can be changed, it is possible to use RFID tags in countries and regions where the RFID system use frequency is different and to reset the use frequency, and in the vicinity of the use frequency of the RFID system. Even when a wireless communication device using a device emits a high-power transmission radio wave, an RFID system that is not subjected to sensitivity suppression can be obtained. Furthermore, the frequency band between the pass band and the stop band of the filter unit can be changed by placing the frequency setting command signal, which is the frequency information of the post-switching transmission wave after switching, on the command signal before switching the frequency of the transmission wave. An RFID system that can use the RFID tag can be obtained even if the RFID tag is brought into a country or region where the frequency of use of the RFID system does not exist in the RFID system where the frequency setting wave transmitting means does not exist .
According to the fifth aspect of the present invention, among the incoming radio waves including the transmission wave of the RFID reader / writer received by the antenna unit, the frequency band of the transmission wave is a pass band, and the frequency band other than the transmission wave is a stop band Since the wireless communication device using a band near the RFID system use frequency emits a high-power transmission radio wave, an RFID tag that is not subjected to sensitivity suppression can be obtained. In addition, since the frequency band between the pass band and the stop band of the filter unit can be changed, it is possible to use RFID tags in countries and regions where the RFID system use frequency is different and to reset the use frequency, and in the vicinity of the use frequency of the RFID system Even when a wireless communication device using the device emits a high-power transmission radio wave, an RFID tag that is not subjected to sensitivity suppression can be obtained. Further, the frequency band between the pass band and the stop band of the filter unit can be changed by the frequency setting command signal which is the frequency information of the transmission wave after switching after switching to the command signal before switching the frequency of the transmission wave. In addition, it is possible to obtain an RFID tag that can be used even if it is brought into a country or region where the frequency of use of the RFID system in which no frequency setting wave transmitting means is present is different.

実施の形態１．
以下、この発明の実施の形態１について図１，図２を用いて説明する。図１は、実施の形態１によるＲＦＩＤシステムの運用図、図２は、実施の形態１によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図であり、図１，図２において、１はＲＦＩＤタグ、２はＲＦＩＤリーダライタ、３はＲＦＩＤタグ１に送信波ｆ０を送るＲＦＩＤリーダライタに設けられたリーダライタアンテナ部、４はＲＦＩＤタグに設けられたアンテナ部、５はアンテナ部４が受信した送信波を整流回路で平滑化し、電力を生成する電源回路、６はＲＦＩＤタグに搭載され、固体識別情報等のタグ情報が格納されたメモリ部、７はアンテナ部４が受信した送信波を濾波するフィルタ部、８はフィルタ部７が濾波した送信波を復調する復調回路、９は復調回路８で復調された送信波によりメモリ部６を制御する制御回路、１０は制御回路９によりメモリ部６から引き出された情報を変調し、アンテナ部４に送る変調回路、１１はＲＦＩＤ１及びＲＦＩＤリーダライタ２の近傍で大電力の送信電波ｆ１を出す無線通信機器（携帯電話）である。図中、同一符号は、同一又は相当部分を示しそれらについての詳細な説明は省略する。 Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. 1 is an operation diagram of the RFID system according to the first embodiment. FIG. 2 is a configuration diagram of an RFID tag circuit of the RFID system according to the first embodiment. In FIGS. 1 and 2, 1 is an RFID tag and 2 is an RFID tag. A reader / writer 3 transmits a transmission wave f 0 to the RFID tag 1. A reader / writer antenna unit provided in the RFID reader / writer 4, an antenna unit provided in the RFID tag 5, rectifies a transmission wave received by the antenna unit 4. A power supply circuit that smoothes and generates power by a circuit, 6 is mounted on an RFID tag, a memory unit that stores tag information such as individual identification information, and 7 is a filter unit that filters a transmission wave received by the antenna unit 4; Reference numeral 8 denotes a demodulation circuit that demodulates the transmission wave filtered by the filter unit 7, 9 denotes a control circuit that controls the memory unit 6 using the transmission wave demodulated by the demodulation circuit 8, and 10 denotes a control circuit 9. A modulation circuit 11 that modulates information extracted from the memory unit 6 and sends the modulated information to the antenna unit 4, 11 is a wireless communication device (mobile phone) that emits a high-power transmission radio wave f 1 in the vicinity of the RFID 1 and the RFID reader / writer 2. . In the drawings, the same reference numerals denote the same or corresponding parts, and detailed descriptions thereof are omitted.

ＲＦＩＤシステムを利用する用途（生体・物品の入退室管理や物流管理）に合わせて、それらのタグ情報がＲＦＩＤタグ１のメモリ部６に格納されており、ＲＦＩＤリーダライタ２は、自身の送受信エリア内にＲＦＩＤタグ１が存在又は移動しているときにタグ情報の更新・書き換え、又は読み出しを行うことができる。次に動作について説明する。ＲＦＩＤリーダライタ２は、更新・書き換え、又は読み出し等をＲＦＩＤタグ１に命令するコマンド信号をリーダライタアンテナ部３から送信波ｆ０としてＲＦＩＤタグ１へ送信する。ＲＦＩＤタグ１のアンテナ部４が送信波ｆ０を受信し、送信波ｆ０は電源回路５により検波・蓄電（平滑化）され、ＲＦＩＤタグ１の動作電源を生成し、ＲＦＩＤタグ１の各回路に動作電源を供給する。また、送信波ｆ０はアンテナ部４と復調回路８との間で、コマンド信号のみが伝送される経路に挿入されたフィルタ部７により濾波され、復調回路８によりコマンド信号が復調される。復調されたコマンド信号の命令内容から制御回路９がデータ処理し、メモリ部６へタグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行い、この制御回路の指示によりメモリ部６が出力した読み出し信号が変調回路１０により変調された返信波ｆ０がアンテナ部４からリーダライタアンテナ部３に送信される。 The tag information is stored in the memory unit 6 of the RFID tag 1 according to the use of the RFID system (biological / article entry / exit management and logistics management), and the RFID reader / writer 2 has its own transmission / reception area. The tag information can be updated / rewritten or read out when the RFID tag 1 is present or moving. Next, the operation will be described. RFID reader writer 2, updated and rewritten, or transmits a command signal for commanding readout like the RFID tag 1 from the reader-writer antenna 3 to the RFID tag 1 as a transmission wave f 0. Antenna unit 4 of the RFID tag 1 receives the transmitted wave f 0, the transmitted wave f 0 is detected, the power storage (smoothing) by the power supply circuit 5 generates an operation power of the RFID tag 1, each circuit of the RFID tag 1 Supply operating power to The transmission wave f 0 is filtered between the antenna unit 4 and the demodulation circuit 8 by the filter unit 7 inserted in the path through which only the command signal is transmitted, and the command signal is demodulated by the demodulation circuit 8. The control circuit 9 performs data processing from the instruction content of the demodulated command signal, and instructs the memory unit 6 to update or rewrite tag information, or to read the tag information. A return wave f 0 obtained by modulating the read signal output from 6 by the modulation circuit 10 is transmitted from the antenna unit 4 to the reader / writer antenna unit 3.

ここで、図１に示す無線通信機器１１がＲＦＩＤ１及びＲＦＩＤリーダライタ２の送受信エリア内で大電力の送信電波ｆ１を出し、この送信電波ｆ１の周波数が送信波ｆ０の周波数の近傍であると、ＲＦＩＤタグ１のアンテナ部４は送信電波ｆ１もあわせて受信してしまうが、ＲＦＩＤタグ１のフィルタ部７が、送信波ｆ０の周波数帯を通過帯、前記送信波以外の周波数帯を阻止帯の性能を有していれば、フィルタ部７が送信波ｆ０の電波を濾波して、無線通信機器１１の送信電波ｆ１による復調回路８へ感度抑圧によるコマンド信号の正常認識への悪影響を生じない。具体的に、フィルタ部７は、送信波ｆ０を通過させ、無線通信機器１１の送信電波ｆ１を含む送信波ｆ０以外の周波数の信号を抑圧する帯域通過フィルタ（ＢＰＦ）が用いられるか、無線通信機器１１の送信電波ｆ１の周波数が既知の場合は、送信電波ｆ１のみを抑圧し、送信波ｆ０を通過させる帯域抑圧フィルタ（ＢＲＦ）を用いてもよい。なお、リーダライタアンテナ部３とアンテナ部４とは、送信用と受信用のアンテナを別々に設けてもよいことや送信波と返信波との周波数を変えてもよいことは言うまでもない。また、フィルタ部はコマンド信号のみが伝送されるＲＦＩＤタグのアンテナ部と復調回路との間に挿入されているので、電源回路５用の電波（送信波ｆ０）や変調回路１０から出力される読み出し信号（応答信号）に無用な損失を発生させることはない。 Here, the radio communication apparatus 11 shown in FIG. 1 issues a transmission radio wave f 1 of the large power RFID1 and the transmission and reception area of the RFID reader-writer 2, the frequency of the transmission radio wave f 1 is in the vicinity of the frequency of the transmitted wave f 0 If there is, the antenna unit 4 of the RFID tag 1 also receives the transmission radio wave f 1, but the filter unit 7 of the RFID tag 1 passes the frequency band of the transmission wave f 0 and has a frequency other than the transmission wave. If the band has the performance of a stop band, the filter unit 7 filters the radio wave of the transmission wave f 0 and recognizes the normality of the command signal by suppressing the sensitivity to the demodulation circuit 8 by the transmission radio wave f 1 of the wireless communication device 11. Does not cause adverse effects. Specifically, whether the filter unit 7 passes the transmitted wave f 0, bandpass filter for suppressing the frequency of a signal other than the transmission wave f 0 including the transmission radio wave f 1 of the radio communication device 11 (BPF) is used When the frequency of the transmission radio wave f 1 of the wireless communication device 11 is known, a band suppression filter (BRF) that suppresses only the transmission radio wave f 1 and passes the transmission wave f 0 may be used. Needless to say, the reader / writer antenna unit 3 and the antenna unit 4 may be provided with separate antennas for transmission and reception, and the frequencies of the transmission wave and the return wave may be changed. Further, since the filter unit is inserted between the antenna unit of the RFID tag that transmits only the command signal and the demodulation circuit, it is output from the radio wave (transmission wave f 0 ) for the power supply circuit 5 and the modulation circuit 10. There is no unnecessary loss in the read signal (response signal).

実施の形態２．
この発明の実施の形態２について図３を用いて説明する。図３は、実施の形態２によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図であり、図３において、１２は通過帯と阻止帯との周波数帯が変更可能であるフィルタ部（チューナブルフィルタ）、１３はフィルタ部１２の周波数切替を指示する周波数切替回路である。図中、同一符号は、同一又は相当部分を示しそれらについての詳細な説明は省略する。なお、フィルタ部１２には、共振器ＢＰＦの可変容量ダイオードに印加する直流電流を変化させることにより容量を変化させ、通過帯を変化させるものなどがある。実施の形態２のＲＦＩＤシステムの基本的な運用や各回路の動作は実施の形態１と同じであるので、以下に異なる点のみを記す。 Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a configuration diagram of an RFID tag circuit of the RFID system according to the second embodiment. In FIG. 3, 12 is a filter unit (tunable filter) in which the frequency band between the pass band and the stop band can be changed, and 13 is It is a frequency switching circuit that instructs frequency switching of the filter unit 12. In the drawings, the same reference numerals denote the same or corresponding parts, and detailed descriptions thereof are omitted. The filter unit 12 includes one that changes the capacitance by changing the direct current applied to the variable capacitance diode of the resonator BPF and changes the passband. Since the basic operation and operation of each circuit of the RFID system of the second embodiment are the same as those of the first embodiment, only the differences will be described below.

実施の形態１では、ＲＦＩＤシステムの送信波ｆ０は固定あったが、図３に示すＲＦＩＤタグ１では、通過帯と阻止帯との周波数帯が変更可能であるフィルタ部１２が実装されており、周波数切替回路１３がフィルタ部１２の通過帯と阻止帯との周波数帯を切替えることにより、多くの国や地域でのＲＦＩＤシステム使用周波数等の規格が異なる場合でもＲＦＩＤタグが使用可能となる。また、周波数切替回路１３が切替指示を出すトリガは、ＲＦＩＤタグに切替スイッチ等を設けて行うなどが考えられる。なお、使用周波数の変化が大きい（切替帯域が広い）場合は、使用周波数毎に対応するアンテナ部４を複数設けることや、周波数切替回路１３がフィルタ部１２に通過帯と阻止帯との周波数帯の切替えの指示するだけでなく、復調回路８と変調回路１０を使用周波数毎に複数個、切替可能にＲＦＩＤタグ１の内部回路に設けて、それらをフィルタ部１２とあわせて切替えてもよい。このようにＲＦＩＤタグ１内の回路を構成することにより、コマンド信号の送信波ｆ０や抑圧する必要がある大電力の送信電波ｆ１を出す無線通信機器１１の使用周波数の変化に容易に対応できる。 In the first embodiment, the transmission wave f 0 of the RFID system is fixed, but the RFID tag 1 shown in FIG. 3 has a filter unit 12 that can change the frequency band between the pass band and the stop band. By switching the frequency band between the pass band and the stop band of the filter unit 12 by the frequency switching circuit 13, the RFID tag can be used even when the standards such as the RFID system use frequency differ in many countries and regions. In addition, the trigger that the frequency switching circuit 13 issues a switching instruction may be performed by providing a changeover switch or the like on the RFID tag. When the change in the use frequency is large (the switching band is wide), a plurality of antenna units 4 corresponding to each use frequency are provided, or the frequency switching circuit 13 is provided in the filter unit 12 in the frequency band between the pass band and the stop band. In addition to instructing switching, a plurality of demodulation circuits 8 and modulation circuits 10 may be provided in the internal circuit of the RFID tag 1 so as to be switchable for each use frequency, and these may be switched together with the filter unit 12. By configuring the circuit in the RFID tag 1 in this way, it is possible to easily cope with changes in the frequency used by the wireless communication device 11 that emits the command signal transmission wave f 0 and the high-power transmission radio wave f 1 that needs to be suppressed. it can.

実施の形態３．
この発明の実施の形態３について図４〜８を用いて説明する。図４，図６は、実施の形態３によるＲＦＩＤシステムの運用図、図５，図７は、実施の形態３によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図、図８は、実施の形態３によるＲＦＩＤシステムの周波数設定フロー図であり、図４〜８において、１４は周波数設定波送信手段である周波数設定コマンド送信回路内蔵のＲＦＩＤリーダライタ、１５はＲＦＩＤリーダライタ１４に設けられた周波数設定コマンド信号を送信する周波数設定コマンド信号送信アンテナ部、１６はＲＦＩＤタグ１に設けられた周波数設定コマンド信号を受信する周波数設定コマンド信号受信アンテナ部、１７は周波数設定コマンド信号を復調する周波数設定回路、１８はＲＦＩＤリーダライタ１４の外部に設けられた周波数設定波送信手段である周波数設定コマンド送信装置である。図中、同一符号は、同一又は相当部分を示しそれらについての詳細な説明は省略する。実施の形態３のＲＦＩＤシステムの基本的な運用や各回路の動作は実施の形態２と同じであるので、以下に異なる点のみを記す。 Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIGS. 4 and 6 are operational diagrams of the RFID system according to the third embodiment, FIGS. 5 and 7 are configuration diagrams of an RFID tag circuit of the RFID system according to the third embodiment, and FIG. 8 is an RFID system according to the third embodiment. 4 to 8, 14 is an RFID reader / writer with a built-in frequency setting command transmission circuit as a frequency setting wave transmitting means, and 15 is a frequency setting command signal provided in the RFID reader / writer 14. A frequency setting command signal transmitting antenna unit for performing the operation, 16 is a frequency setting command signal receiving antenna unit for receiving a frequency setting command signal provided in the RFID tag 1, 17 is a frequency setting circuit for demodulating the frequency setting command signal, and 18 is an RFID reader. Frequency setting command which is a frequency setting wave transmitting means provided outside the writer 14 It is a communication apparatus. In the drawings, the same reference numerals denote the same or corresponding parts, and detailed descriptions thereof are omitted. Since the basic operation and operation of each circuit of the RFID system of the third embodiment are the same as those of the second embodiment, only the differences will be described below.

実施の形態２では、周波数切替回路１３が切替指示を出すトリガは、ＲＦＩＤタグに切替スイッチ等を設けるなどにより行なわれたが、実施の形態３では、周波数設定波送信手段を設けてフィルタ部１２の通過帯と阻止帯との周波数帯を切替える。次に動作を説明する。ＲＦＩＤシステムの送信波ｆ０と周波数が異なる送信波ｆ０の周波数情報である周波数設定コマンド信号を周波数設定波送信手段が周波数設定波ｆ２として周波数設定コマンド信号送信アンテナ部１５から送信する。周波数設定波ｆ２はＲＦＩＤタグ１に設けられた周波数設定コマンド信号受信アンテナ部１６で受信され、図８のＲＦＩＤシステムの周波数設定フロー図に示すように周波数設定回路１７が周波数設定コマンド信号を復調し、周波数切替信号を生成する。この周波数切替信号の指示によりフィルタ部１２の通過帯と阻止帯との周波数帯を切替えることにより、多くの国や地域でのＲＦＩＤシステム使用周波数等の規格が異なる場合でもＲＦＩＤタグが使用可能で、無線通信機器が大電力の送信電波ｆ１を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。 In the second embodiment, the trigger that the frequency switching circuit 13 issues a switching instruction is performed by providing a changeover switch or the like in the RFID tag. However, in the third embodiment, the filter unit 12 is provided with a frequency setting wave transmission unit. The frequency band between the pass band and the stop band is switched. Next, the operation will be described. The frequency setting command transmission means transmits the frequency setting command signal, which is frequency information of the transmission wave f 0 having a frequency different from that of the transmission wave f 0 of the RFID system, from the frequency setting command signal transmission antenna unit 15 as the frequency setting wave f 2 . Frequency setting wave f 2 is received by the frequency setting command signal receiving antenna unit 16 provided in the RFID tag 1, demodulates the frequency setting command signal frequency setting circuit 17 is as shown in the frequency setting flow diagram of the RFID system of FIG. 8 Then, a frequency switching signal is generated. By switching the frequency band between the pass band and the stop band of the filter unit 12 according to the instruction of the frequency switching signal, the RFID tag can be used even when the standards such as the RFID system use frequency differ in many countries and regions. wireless communication device even out the transmission radio wave f 1 for high power, it is possible to obtain an RFID system that does not undergo desensitization.

なお、使用周波数は送信波ｆ０がＵＨＦ帯（８００／９００ＭＨｚ）、波数設定波ｆ２が１３．５６ＭＨｚ帯や２．４５ＧＨｚ帯の利用が考えられる。また、周波数設定波送信手段は、図４と図５に示すように、ＲＦＩＤリーダライタ１４に内蔵しても構わないし、図６と図７に示すようにＲＦＩＤリーダライタ２の外部に周波数設定コマンド送信装置１８を設けても構わない。また、周波数設定波ｆ２がＲＦＩＤシステムの送信エリア内に伝播していないときには、ＲＦＩＤシステムが通常運用されることはいうまでもない。 Note that it is conceivable that the use frequency is the UHF band (800/900 MHz) for the transmission wave f 0 and the 13.56 MHz band or the 2.45 GHz band for the wave number setting wave f 2 . Further, the frequency setting wave transmitting means may be incorporated in the RFID reader / writer 14 as shown in FIGS. 4 and 5, or a frequency setting command may be provided outside the RFID reader / writer 2 as shown in FIGS. A transmission device 18 may be provided. Further, when the frequency setting wave f 2 does not propagate in the transmission area of the RFID system, it is needless to say that the RFID system is usually operated.

実施の形態４．
この発明の実施の形態４について図９，図１０を用いて説明する。図９は、実施の形態３によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図、図１０は、実施の形態４によるＲＦＩＤシステムの周波数設定フロー図であり、図中、同一符号は、同一又は相当部分を示しそれらについての詳細な説明は省略する。実施の形態４のＲＦＩＤシステムの基本的な運用や各回路の動作は実施の形態２と同じであるので、以下に異なる点のみを記す。実施の形態２では、周波数切替回路１３が切替指示を出すトリガは、ＲＦＩＤタグに切替スイッチ等を設けるなどにより行なわれ、実施の形態３では、周波数設定波送信手段を設けてフィルタ部１２の通過帯と阻止帯との周波数帯を切替えていたが、実施の形態４では、送信波ｆ０の周波数の切替前にコマンド信号に切替後の切替後送信波の周波数情報である周波数設定コマンド信号を載せて、フィルタ部１２の通過帯と阻止帯との周波数帯を切替える。 Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a configuration diagram of an RFID tag circuit of the RFID system according to the third embodiment. FIG. 10 is a frequency setting flow diagram of the RFID system according to the fourth embodiment. In the figure, the same reference numerals indicate the same or corresponding parts. Detailed description thereof will be omitted. Since the basic operation and operation of each circuit of the RFID system of the fourth embodiment are the same as those of the second embodiment, only the differences will be described below. In the second embodiment, the trigger in which the frequency switching circuit 13 issues a switching instruction is performed by providing a changeover switch or the like on the RFID tag. In the third embodiment, a frequency setting wave transmitting unit is provided to pass through the filter unit 12. had switched to a frequency band of the band and the blocking band, in the fourth embodiment, the frequency setting command signal is a frequency information of the after-switching transmission wave after switching to the command signal before the switching of the frequency of the transmitted wave f 0 The frequency band between the pass band and the stop band of the filter unit 12 is switched.

次に動作を説明する。ＲＦＩＤシステムの送信波ｆ０をアンテナ部４が受信し、図１０のＲＦＩＤシステムの周波数設定フロー図に示すように送信波ｆ０のコマンド信号の中に周波数設定コマンド信号が含まれているとき、復調回路８が周波数設定コマンド信号を復調し、この周波数設定コマンド信号に基づき、制御回路９から周波数設定回路１７へ指令がなされ、フィルタ部１２の通過帯と阻止帯との周波数帯が切替えられる。なお、周波数設定回路１７が周波数設定コマンド信号を復調してもよい(図示せず)。このようにして、ＲＦＩＤタグ１がＲＦＩＤシステムに図５及び図７に示すような周波数設定波送信手段が存在しないＲＦＩＤシステムの使用周波数が異なる国や地域に持ち込まれても、事前に上記のように使用周波数を変更しておけば、多くの国や地域でのＲＦＩＤシステム使用周波数等の規格が異なる場合でもＲＦＩＤタグが使用可能で、無線通信機器が大電力の送信電波ｆ１を出していても、感度抑圧を受けないＲＦＩＤシステムを得ることができる。また、送信波ｆ０のコマンド信号の中に周波数設定コマンド信号が含まれていないときには、ＲＦＩＤシステムが通常運用されることはいうまでもない。 Next, the operation will be described. When the transmitted wave f 0 of the RFID system and the receiving antenna unit 4 includes a frequency setting command signal into the command signal of the transmitted wave f 0 as shown in the frequency setting flow diagram of the RFID system of FIG. 10, The demodulating circuit 8 demodulates the frequency setting command signal, and based on the frequency setting command signal, a command is given from the control circuit 9 to the frequency setting circuit 17, and the frequency band between the pass band and the blocking band of the filter unit 12 is switched. The frequency setting circuit 17 may demodulate the frequency setting command signal (not shown). In this way, even if the RFID tag 1 is brought into a country or region where the operating frequency of the RFID system in which the frequency setting wave transmitting means as shown in FIGS. 5 and 7 does not exist in the RFID system is different, as described above. If the frequency used is changed, the RFID tag can be used even if the standards such as the RFID system frequency used in many countries and regions are different, and the wireless communication device emits a high-power transmission radio wave f 1. In addition, an RFID system that is not subjected to sensitivity suppression can be obtained. Needless to say, when the frequency setting command signal is not included in the command signal of the transmission wave f 0 , the RFID system is normally operated.

この発明の実施の形態１によるＲＦＩＤシステムの運用図である。It is an operation | use figure of the RFID system by Embodiment 1 of this invention. この発明の実施の形態１によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図である。It is a RFID tag circuit block diagram of the RFID system by Embodiment 1 of this invention. この発明の実施の形態２によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図である。It is a RFID tag circuit block diagram of the RFID system by Embodiment 2 of this invention. この発明の実施の形態３によるＲＦＩＤシステムの運用図である。It is an operation | use figure of the RFID system by Embodiment 3 of this invention. この発明の実施の形態３によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図である。It is a RFID tag circuit block diagram of the RFID system by Embodiment 3 of this invention. この発明の実施の形態３によるＲＦＩＤシステムの運用図である。It is an operation | use figure of the RFID system by Embodiment 3 of this invention. この発明の実施の形態３によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図である。It is a RFID tag circuit block diagram of the RFID system by Embodiment 3 of this invention. この発明の実施の形態３によるＲＦＩＤシステムの周波数設定フロー図である。It is a frequency setting flowchart of the RFID system by Embodiment 3 of this invention. この発明の実施の形態４によるＲＦＩＤシステムのＲＦＩＤタグ回路構成図である。It is a RFID tag circuit block diagram of the RFID system by Embodiment 4 of this invention. この発明の実施の形態４によるＲＦＩＤシステムの周波数設定フロー図である。It is a frequency setting flowchart of the RFID system by Embodiment 4 of this invention.

符号の説明Explanation of symbols

１…ＲＦＩＤタグ、２…ＲＦＩＤリーダライタ、３…リーダライタアンテナ部、４…アンテナ部、５…電源回路、６…メモリ部、７…フィルタ部、８…復調回路、９…制御回路、１０…変調回路、１１…無線通信機器（携帯電話）、１２…フィルタ部（チューナブルフィルタ）、１３…周波数切替回路、１４…ＲＦＩＤリーダライタ（周波数設定コマンド送信回路内蔵）、１５…周波数設定コマンド信号送信アンテナ部、１６…周波数設定コマンド信号受信アンテナ部、１７…周波数設定回路、１８…周波数設定コマンド送信装置

DESCRIPTION OF SYMBOLS 1 ... RFID tag, 2 ... RFID reader / writer, 3 ... Reader / writer antenna part, 4 ... Antenna part, 5 ... Power supply circuit, 6 ... Memory part, 7 ... Filter part, 8 ... Demodulation circuit, 9 ... Control circuit, 10 ... Modulation circuit 11... Wireless communication device (mobile phone) 12... Filter unit (tunable filter) 13... Frequency switching circuit 14 .. RFID reader / writer (built-in frequency setting command transmission circuit) 15. Antenna unit 16 ... Frequency setting command signal receiving antenna unit 17 ... Frequency setting circuit 18 ... Frequency setting command transmitting device

Claims (5)

ＲＦＩＤリーダライタから送信されるコマンド信号である送信波をＲＦＩＤタグが受信し、その送信波のコマンド信号により前記ＲＦＩＤタグ内のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤタグが前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤシステムにおいて、前記送信波と周波数が異なる電波を送信する手段であって、前記ＲＦＩＤタグが受信する前記送信波の周波数帯を前記ＲＦＩＤタグに切替させるために、切替後送信波の周波数情報である周波数設定コマンド信号を周波数設定波として前記ＲＦＩＤタグへ送信する周波数設定波送信手段と、前記ＲＦＩＤタグに設けられ、前記送信波を含む到来電波を受信する第１のアンテナ部と、前記ＲＦＩＤタグに設けられ、前記周波数設定波を受信する第２のアンテナ部と、この第２のアンテナ部が受信した前記周波数設定波を復調し、前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記第１のアンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に設定し、前記切替後送信波以外の周波数帯を阻止帯に設定するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたＲＦＩＤシステム。 The RFID tag receives a transmission wave, which is a command signal transmitted from the RFID reader / writer, and updates or rewrites tag information stored in the memory unit in the RFID tag by the transmission wave command signal, or the tag information. In the RFID system in which the RFID tag transmits a return wave as a read signal to the RFID reader / writer, a means for transmitting a radio wave having a frequency different from that of the transmission wave, the frequency band of the transmission wave received by the RFID tag For switching to the RFID tag, a frequency setting wave transmitting means for transmitting a frequency setting command signal, which is frequency information of the transmission wave after switching, to the RFID tag as a frequency setting wave, and provided in the RFID tag, the transmission A first antenna unit that receives incoming radio waves including waves, and the RFID tag. A second antenna unit that receives the frequency setting wave; a frequency setting circuit that demodulates the frequency setting wave received by the second antenna unit and generates a frequency switching signal from the frequency setting command signal; Based on the frequency switching signal , the passband of the incoming radio wave received by the first antenna unit is set from the frequency band of the transmission wave to the frequency band of the transmission wave after switching, and other than the transmission wave after switching A filter unit for setting a frequency band as a stop band; a demodulation circuit for demodulating a command signal of the post-switching transmission wave filtered from the incoming radio wave by the filter unit; and a demodulated command signal from the demodulated command signal to the memory unit A control circuit that instructs either or both of updating / rewriting and reading of tag information, and reading output from the memory unit according to the instructions of the control circuit RFID system comprising a modulation circuit for modulating a signal to the reply wave. 前記周波数設定波送信手段は、前記ＲＦＩＤリーダライタに設けられるものである請求項１に記載のＲＦＩＤシステム。   The RFID system according to claim 1, wherein the frequency setting wave transmission unit is provided in the RFID reader / writer. ＲＦＩＤリーダライタから送信されるコマンド信号である送信波を受信し、その送信波のコマンド信号により内部のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤタグにおいて、前記送信波を含む到来電波を受信する第１のアンテナ部と、前記送信波と周波数が異なる電波であって、受信する前記送信波の周波数帯を切替るための、切替後送信波の周波数情報である周波数設定コマンド信号を周波数設定波として受信する第２のアンテナ部と、この第２のアンテナ部が受信した前記周波数設定波を復調し、前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記第１のアンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に設定し、前記切替後送信波以外の周波数帯を阻止帯に設定するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたＲＦＩＤタグ。 A transmission wave that is a command signal transmitted from the RFID reader / writer is received, and the tag information stored in the internal memory unit is updated or rewritten by the command signal of the transmission wave, or the tag information is transferred to the RFID reader / writer. In an RFID tag that transmits a return wave as a read signal, a first antenna unit that receives an incoming radio wave including the transmission wave, a radio wave having a frequency different from that of the transmission wave, and a frequency band of the transmission wave to be received A second antenna unit that receives a frequency setting command signal that is frequency information of a transmission wave after switching as a frequency setting wave for switching, and demodulates the frequency setting wave received by the second antenna unit, a frequency setting circuit for generating a frequency switching signal from the frequency setting command signal, based on the frequency switching signal, said first antenna The passband of the incoming radio wave section has received, a filter unit and set the frequency band of the transmission wave frequency band of the post-switching transmission wave, sets the frequency band other than the transmission after the switching wave stopband, this A demodulation circuit that demodulates the command signal of the post-switching transmission wave filtered from the incoming radio wave by the filter unit, and any one of update / rewrite and reading of the tag information to the memory unit from the demodulated command signal An RFID tag comprising: a control circuit that instructs both, and a modulation circuit that modulates a read signal output from the memory unit into a return wave according to the instruction of the control circuit. ＲＦＩＤリーダライタから送信されるコマンド信号である送信波をＲＦＩＤタグが受信し、その送信波のコマンド信号により前記ＲＦＩＤタグ内のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤタグが前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤシステムにおいて、前記送信波の周波数が切替る前に前記コマンド信号に切替後の切替後送信波の周波数情報である周波数設定コマンド信号が含まれている場合であって、前記送信波又は前記切替後送信波を含む到来電波を受信するアンテナ部と、このアンテナ部が受信した前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記アンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に変更し、前記切替後送信波以外の周波数帯を阻止帯に変更するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたＲＦＩＤシステム。 The RFID tag receives a transmission wave, which is a command signal transmitted from the RFID reader / writer, and updates or rewrites tag information stored in the memory unit in the RFID tag by the transmission wave command signal, or the tag information. In the RFID system in which the RFID tag transmits a return wave as a read signal to the RFID reader / writer, the frequency setting is the frequency information of the transmission wave after switching after switching to the command signal before the frequency of the transmission wave is switched When a command signal is included, an antenna unit that receives an incoming radio wave including the transmission wave or the transmission wave after switching and a frequency switching signal are generated from the frequency setting command signal received by the antenna unit a frequency setting circuit, based on the frequency switching signal, the incoming radio waves the antenna unit receives The passband, and change the frequency band of the transmission wave frequency band of the post-switching transmission wave, a filter unit for changing the frequency band other than the post-switching transmission wave in the blocking band, from the incoming waves by the filter portion The demodulating circuit that demodulates the filtered command signal of the post-switching transmission wave, and instructs the memory unit to update or rewrite and / or read the tag information from the demodulated command signal An RFID system comprising: a control circuit; and a modulation circuit that modulates a read signal output from the memory unit according to an instruction from the control circuit into a return wave. ＲＦＩＤリーダライタから送信されるコマンド信号である送信波を受信し、その送信波のコマンド信号により内部のメモリ部に格納されているタグ情報の更新・書き換え、又はそのタグ情報を前記ＲＦＩＤリーダライタに読み出し信号として返信波を送信するＲＦＩＤタグにおいて、前記送信波の周波数が切替る前に前記コマンド信号に切替後の切替後送信波の周波数情報である周波数設定コマンド信号が含まれている場合であって、前記送信波又は前記切替後送信波を含む到来電波を受信するアンテナ部と、このアンテナ部が受信した前記周波数設定コマンド信号から周波数切替信号を生成する周波数設定回路と、前記周波数切替信号に基づいて、前記アンテナ部が受信した到来電波の通過帯を、前記送信波の周波数帯から前記切替後送信波の周波数帯に変更し、前記切替後送信波以外の周波数帯を阻止帯に変更するフィルタ部と、このフィルタ部によって前記到来電波から濾波された前記切替後送信波のコマンド信号を復調する復調回路と、復調されたコマンド信号から、前記メモリ部へ前記タグ情報の更新・書き換えと読み出しとのいずれか一方、又は両方の指示を行う制御回路と、この制御回路の指示により前記メモリ部が出力した読み出し信号を返信波に変調する変調回路とを備えたＲＦＩＤタグ。 A transmission wave that is a command signal transmitted from the RFID reader / writer is received, and the tag information stored in the internal memory unit is updated or rewritten by the command signal of the transmission wave, or the tag information is transferred to the RFID reader / writer. In an RFID tag that transmits a return wave as a read signal, the command signal includes a frequency setting command signal that is frequency information of the post-switching transmission wave before switching the frequency of the transmission wave. Te, an antenna unit for receiving the incoming radio wave including the transmission wave or the post-switching transmission wave, a frequency setting circuit for generating a frequency switching signal from said frequency setting command signal the antenna unit receives, to the frequency switching signal based on the pass band of the incoming radio waves the antenna unit receives the transmission after the switching from the frequency band of the transmission wave Change in the frequency band of a filter unit for changing the frequency band other than the transmission after the switching wave stopband, demodulation circuit for demodulating a command signal of the after-switching transmission wave filtered from the incoming waves by the filter portion And a control circuit for instructing one or both of updating / rewriting and reading of the tag information to the memory unit from the demodulated command signal, and the memory unit outputs in accordance with the instruction of the control circuit An RFID tag including a modulation circuit that modulates a read signal into a return wave.
JP2005293625A 2005-10-06 2005-10-06 RFID system and RFID tag Expired - Fee Related JP4807029B2 (en)

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