WO2006082612A1 - Rfidキャリアセンス方法及び,これを用いるrfidシステム - Google Patents
Rfidキャリアセンス方法及び,これを用いるrfidシステム Download PDFInfo
- Publication number
- WO2006082612A1 WO2006082612A1 PCT/JP2005/001319 JP2005001319W WO2006082612A1 WO 2006082612 A1 WO2006082612 A1 WO 2006082612A1 JP 2005001319 W JP2005001319 W JP 2005001319W WO 2006082612 A1 WO2006082612 A1 WO 2006082612A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reader
- polarization
- writer
- channel
- antenna
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10356—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
Definitions
- the present invention relates to a radio frequency identification (RFID) carrier sensing method, an RFID reader / writer using the method, and an RFID system.
- RFID radio frequency identification
- Non-Patent Document 1 suggests the use of an RFID system using the 865 MHz-868 MHz band with power up to 2 W!
- Fig. 1 is a diagram for explaining an example of a powerful state.
- the signal transmitted by each reader / writer # 1 (# 2) becomes interference 3 with the other reader / writer # 2 (# 1), and reception by reader / writer # 1, # 2
- FIG. 2 is a diagram for explaining a method using powerful carrier sense, and is a flow of reading tag information in each reader / writer in FIG.
- each reader / writer # 1, # 2 is composed of a reader / writer body la and an antenna lb.
- an initial channel (frequency band) is set in the reader / writer main unit la (step S1), and the level of the carrier received by the antenna lb in the set initial channel is determined by interference. Determine as a signal (step S2). If the level of the interference signal is greater than or equal to the threshold (step S3, N), the channel cannot be used, and the interference level in other channels is taken as the measurement target. That is, it is determined whether all channels have already been measured. If there are channels that have not been measured (step S4, N), the channels are switched sequentially (step S5), and the same interference level measurement (step S2) is performed. Return to).
- step S6 If all channels have already been measured (step S4, Y), the waiting time is set randomly (step S6), and the initial channel setting (step) is performed again after the set waiting time has elapsed. Return to S1) and repeat the above process.
- step S2 if the interference level is below the threshold (step S3, Y), a channel having the interference level below the threshold is determined (step S7), and the command signal is Send (step S8).
- FIG. 3 is a diagram for explaining a command signal radiated from the antenna lb of the reader / writer 2) and a response signal of the tag 2a (2b) force.
- readers / writers # 1, # 2 transmit an unmodulated continuous wave CW and modulate this unmodulated continuous wave CW with a command signal. For example, transmission is performed with a fixed right-handed circularly polarized wave.
- the tags 2a and 2b receive the command signals from the corresponding reader / writers # 1 and # 2, the tag 2a uses the characteristic information including the identification information (ID) of the article attached to the tag as the tag information.
- ID the identification information
- Continue Response by modulating carrier wave CW step S9: See Fig. 3 (B)).
- the reader / writers # 1 and # 2 receive this response signal and terminate the communication (step S10).
- Non-patent literature l Draft ETSI EN 302 208-1V1.1.1 (2003-12)
- carrier sensing is performed to search for a frequency channel that is not used by other readers / writers, and if there is an empty channel, the former is used.
- This method has a problem that the waiting time becomes longer when the number of readers / writers is large.
- the latter method of centralized control by the control device is not effective when the number of readers and writers increases. There is a problem that the allocated communication time is shortened.
- an object of the present invention is to increase the transmission timing waiting time of each reader / writer or to allocate the communication time even when a plurality of reader / writers exist in the RFID system.
- the purpose is to reduce the effect of mutual interference that occurs when multiple reader / writers are close to each other.
- a reader / writer main unit and a polarization-switchable antenna are provided, a reader / writer for transmitting a continuous carrier wave, and the continuous carrier wave as tag information.
- a tag that modulates and returns a response signal to the reader / writer, and the reader / writer main unit determines a level of the received interference signal and sets the level of the interference signal to a threshold value or less.
- a polarization direction is determined, and a response signal from the tag is received in the determined channel and polarization direction.
- the polarization-switchable antenna is capable of switching between right-hand circular polarization and left-hand circular polarization.
- the reader / writer main unit detects a channel in which the level of the received interference signal is below a threshold value in either the right-handed circularly polarized wave or the left-handed circularly polarized wave.
- the polarization-switchable antenna is capable of switching between horizontal polarization and vertical polarization.
- the main body of the writer detects a channel whose received interference signal level is below a threshold value in either the horizontal polarization or the vertical polarization.
- a reader / writer main unit and a reader / writer that has a plurality of antennas each having a unique polarization and that transmits a continuous carrier wave
- a tag that modulates a continuous carrier wave with tag information and returns a response signal to the reader / writer
- the reader / writer main body is received by each of the plurality of antennas for each of the plurality of channels.
- the level of the interference signal An empty channel and an antenna whose level of the interference signal is less than a threshold are determined, and the response signal of the tag power is received by the determined antenna on the determined channel.
- the channel is divided into a plurality of divided frequency bands. It is characterized by being.
- An RFID system that achieves the above-described object is, as a sixth aspect, according to any one of the first to fourth aspects, wherein the tag is connected in parallel to a notch antenna and the patch antenna, and the inductance component
- An RFID system comprising an LSI having an interface unit having a resonant capacitance component.
- a carrier sensing method in an RFID system that achieves the above-mentioned problems is, as its first mode, a reader / writer having a reader / writer main body and a polarization-switchable antenna, and transmitting a continuous carrier wave.
- RFID that modulates the continuous carrier wave with tag information and returns a response signal to the reader / writer
- the reader / writer measures the interference signal level sequentially on a specific channel for all switchable polarizations of the antenna, and when the measured interference signal level is equal to or higher than a threshold, the specific channel To the other channel and measure the interference signal level,
- the measured interference signal level does not exceed the threshold value! / ⁇ channel and polarization direction are determined, and the determined channel and antenna polarization direction is returned from the tag.
- Modulated with the tag information In an R FID system, characterized in that it is configured to receive a continuous carrier signal.
- the reader / writer main unit has a plurality of antennas each having a different polarization direction, and a continuous carrier wave is detected.
- a carrier sense method in an RFID system that performs a reader / writer to send and a tag that modulates the continuous carrier wave with tag information and returns a response signal to the reader / writer.
- Antenna antenna For each polarization, the interference signal level is measured sequentially on a specific channel. When the measured interference signal level is equal to or higher than a threshold, the specific channel is switched to another channel and the interference signal level is measured. Measure the signal level and the measured interference signal level does not exceed the threshold value! /, Determine the antenna set in the channel and polarization direction, and set the determined channel and antenna to receive the continuous carrier wave modulated by the tag information returned from the tag. It is characterized by.
- the first aspect of the reader / writer that achieves the above-described problem is an RFID that has a reader / writer main body and a polarization-switchable antenna, and transmits an I-subcarrier toward a tag.
- a reader / writer in the system that determines a level of a received interference signal, determines a channel that makes the level of the interference signal equal to or less than a threshold, and a polarization direction of the antenna; A response signal generated by modulating the continuous carrier wave with tag information in the polarization direction and returning from the tag is received.
- a second aspect of the reader / writer that achieves the above-described problem is that the reader / writer main unit and each of the reader / writer in the RFID system that has a plurality of inherently polarized antennas and sends a continuous carrier wave toward the tag
- the reader / writer main body unit determines a level of an interference signal received by each of the plurality of antennas for each of the plurality of channels, and the level of the determined interference signal is equal to or less than a threshold value.
- Vacant channels and antennas are determined, and a response signal generated by modulating the continuation carrier with tag information is received by the determined antenna using the determined channel, and a response signal returned from the tag is received.
- FIG. 1 is a diagram for explaining an example of a state when a plurality of readers / writers are operated in close proximity as an RFID system.
- FIG. 2 is a diagram for explaining a method of detecting an empty channel by carrier sense.
- FIG. 3 is a diagram for explaining a command signal radiated from an antenna lb of reader / writer # 1 (# 2) and a response signal of tag 2a (2b) force.
- FIG. 4 is a diagram for explaining the features of the present invention when a plurality of readers / writers # 1, # 2 are operated in close proximity as an RFID system.
- FIG. 5 is a conceptual diagram of a configuration example of a reader / writer to which the present invention is applied.
- FIG. 6 is a conceptual diagram of a configuration example of another reader / writer.
- FIG. 7 is a conceptual block diagram of an embodiment of tag 2a (2b).
- FIG. 8 is an operation flow of an embodiment according to the present invention based on the configuration of a reader / writer and a tag.
- FIG. 9 is a diagram for explaining a command signal radiated from the antenna lb of the reader / writer # 1 (# 2) and a response signal of the tag 2a (2b) force.
- FIG. 10 is a diagram showing the relationship between the channel Chi-Ch 4 and the polarization direction 1 n determined by the embodiment flow of FIG. 8.
- FIG. 11 is a diagram showing an embodiment using a plurality of antennas each having a specific polarization direction set.
- Fig. 4 shows a case where a plurality of readers / writers # 1 and # 2 are operated close to each other as an RFID system.
- a characteristic of the present invention is that during carrier sense. , It has a function 4 that controls the polarization direction of the antenna lb of the reader / writer.
- FIG. 5 is a conceptual diagram of a configuration example of reader / writers # 1 and # 2 to which the present invention is applied.
- the antenna lb includes an antenna element 10 and a polarization direction control unit 20.
- the polarization direction control unit 20 shown in FIG. 5 has a function of switching the polarization direction of the antenna element 10 between right-hand circular polarization and left-hand circular polarization.
- the antenna element 10 also has two dipole antenna forces orthogonal to each other.
- the horizontal dipole antenna is connected to the switch 15, and the vertical dipole antenna is connected to the switch 16.
- the reader / writer main unit la sends the transmission signal TXSIG to the transmission / reception switching switch 14 of the polarization direction control unit 20 and inputs the reception signal TRSIG from the transmission / reception switching switch 14. In addition, the reader / writer main unit la sends a polarization switching signal PWSW to the switch control unit 11 of the polarization direction control unit 20.
- Each of the two hybrid circuits 12, 13 receives the transmission signal TXSIG and outputs a signal shifted in phase by 0 ° and 90 °.
- Switch control unit 11 controls switching switches 14, 15, and 16 according to the polarization switching signal PWSW from reader / writer main unit la.
- the switch control unit 11 when the polarization switching signal PW SW specifying right-handed circularly polarized wave is sent from the reader / writer main unit la to the switch control unit 11, the switch control unit 11 is connected to the output terminal ol, switch of the switch 14. Supply switch switching signal to switches 14, 15, 16 so that input terminal II to 15, 16 is valid.
- a phase shift signal of 0 ° from switch 15 is supplied to the horizontal dipole antenna element of antenna 10, and a phase shift signal of 90 ° from switch 16 is supplied to the vertical direction of antenna 10.
- a phase shift signal of 90 ° from switch 16 is supplied to the vertical direction of antenna 10.
- a 90 ° phase-shifted signal from switch 15 is supplied to the horizontal dipole antenna element of antenna 10 and a 0 ° phase-shifted signal is supplied from switch 16 to the vertical dipole antenna element of antenna 10, Left-handed circular polarization.
- Fig. 6 is a conceptual diagram of another configuration example of the reader / writer, which has a function of switching and controlling the polarization direction of the antenna 10 between horizontal polarization and vertical polarization.
- the antenna lb includes an antenna element 10 and a polarization direction control unit 20 as in the embodiment of FIG.
- the reader / writer main unit la sends the transmission signal TXSIG to the transmission / reception switching switch 14 of the polarization direction control unit 20, and inputs the reception signal TRSIG from the 14 transmission / reception switching switches. Further, the reader / writer main unit la sends a horizontal and vertical polarization direction switching signal PWSW to the switch control unit 11 of the polarization direction control unit 20.
- the polarization direction of the antenna 10 is controlled to be switched to horizontal polarization or vertical polarization based on the polarization switching signal P WSW from the reader / writer main unit la. It is possible to configure more easily than the configuration shown in Fig. 5.
- FIG. 7 is an example conceptual block diagram of the tag 2a (2b). It consists of an antenna 30 and an LSI chip 31.
- the antenna unit 30 is composed of a patch antenna as an example, and has an inductance L as an equivalent circuit.
- LSI LSI
- Chip 31 has a capacitance component C at the interface!
- the antenna unit 30 and the interface unit of the LSI chip 31 are connected in parallel. Therefore, if the inductance L of the antenna unit 30 and the interface component capacitance component C are in a resonance relationship, the continuous wave CW that is also sent by the reader / writer force is received, and the control unit CONT of the LSI chip 31 at the maximum power is received. Can be supplied to the side. [0045]
- the control unit CONT of the LSI chip 31 uses the supplied power to modulate the continuous wave CW with the characteristic information including the identification information of the article attached to the stored tag and fix it from the antenna unit 30. It can be emitted to the reader / writer in the polarization direction (for example, horizontal polarization).
- the reader / writer main unit la performs initial channel (frequency band) setting (step S1) and initial antenna polarization setting (step S11).
- initial antenna polarization is right-handed circular polarization, as described above, in the embodiment shown in FIG. 5, the switch control unit 11 enables the output terminal ol of the switch 14, and the no. Enable the 0 ° phase-shifted output terminal of 12 and the input terminal II of switch 15. At the same time, the 90 ° phase-shifted output terminal of node No. 12 and the input terminal II of switch 16 are made valid.
- the level of the carrier received by the antenna 10 is determined as an interference signal (step S2). If the level of the interference signal is above the threshold (step S3, N), the channel cannot be used! /.
- step S12 the polarization direction (in this case, the left-handed circular polarization direction) is determined (step S12), and the antenna polarization is changed to the left-handed circular polarization.
- step S13 the processing after the interference level measurement (step S2) is continued again in the switched polarization direction.
- step S3, N if the level of the interference signal is equal to or higher than the threshold (step S3, N), the interference level in other channels is set as the measurement target. In other words, it is determined whether all channels have already been measured. If there are channels that have not been measured (step S4, N), the channels are switched sequentially (step S5), and the same interference level measurement ( Return to step S2).
- step S4 If all channels have already been measured (step S4, Y), the waiting time is set randomly (step S6), and the initial channel setting (step) is performed again after the set waiting time has elapsed. Return to S1) and repeat the above process.
- step S2 if the interference level is less than or equal to the threshold (step S3, Y), the used channel and antenna bias that are less than the threshold are used.
- the wave direction is determined (step S7), and a command signal is transmitted (step S8).
- FIG. 9 is a diagram for explaining the command signal radiated from the antenna lb of the reader / writer 2) and the response signal of the tag 2a (2b) force.
- readers # 1 and # 2 use the determined use channel and antenna polarization direction, for example, right-handed circularly polarized wave, and use continuous wave CW as the command.
- the tags 2a and 2b receive the above command signals from the corresponding readers / writers # 1 and # 2, as shown in FIG. Similarly, the identification information is used as tag information, and the continuous wave CW is modulated by a frame signal having a preamble Pre and a check signal CRC before and after it, and reflected to the corresponding reader / writer # 1, # 2 side.
- Reader / writers # 1 and # 2 receive this response signal and terminate communication (step S 10).
- FIG. 10 is a diagram showing the relationship between the channel Chi-Ch 4 and the polarization direction 1 n determined by the embodiment flow of FIG. In Fig. 10, in the white band, the interference signal level is below the threshold, and the corresponding channel (frequency band) and polarization can be used in the reader / writer.
- the reader / writer has one antenna lb and switches the polarization direction of the antenna.
- the application of the present invention is limited to such a configuration. Absent. That is, as shown in Fig. 11, a plurality of antennas 101b-lOnb, each having a specific polarization direction, are connected to the reader / writer main unit la, and the polarization to be set by the reader / writer main unit la is supported. It is also possible to configure so that the specific antenna is selectively controlled to be effective.
- each of the plurality of antennas 101b-onb is configured such that the polarization direction can be variably controlled as shown in FIG. 5 or FIG. 6, the degree of freedom is reduced with fewer antennas. Thus, searching for a communicable channel can be facilitated.
- a usable channel can be used in a fixed polarization.
- a state where the interference signal level is equal to or less than the threshold value is searched for by a combination of the channel and the polarization direction.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/001319 WO2006082612A1 (ja) | 2005-01-31 | 2005-01-31 | Rfidキャリアセンス方法及び,これを用いるrfidシステム |
TW094102876A TWI285844B (en) | 2005-01-31 | 2005-01-31 | RFID carrier sensing method and RFID system using the method |
JP2007501450A JP4336379B2 (ja) | 2005-01-31 | 2005-01-31 | Rfidキャリアセンス方法及び,これを用いるrfidシステム |
DE602005024620T DE602005024620D1 (de) | 2005-01-31 | 2005-01-31 | Rfid-trägererfassungsverfahren und dieses einsetzendes rfid-system |
EP05709482A EP1845630B1 (en) | 2005-01-31 | 2005-01-31 | Rfid carrier sense method and rfid system using the same |
US11/878,925 US8531271B2 (en) | 2005-01-31 | 2007-07-27 | RFID carrier sensing method and RFID system using this RFID carrier sensing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/001319 WO2006082612A1 (ja) | 2005-01-31 | 2005-01-31 | Rfidキャリアセンス方法及び,これを用いるrfidシステム |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/878,925 Continuation US8531271B2 (en) | 2005-01-31 | 2007-07-27 | RFID carrier sensing method and RFID system using this RFID carrier sensing method |
Publications (1)
Publication Number | Publication Date |
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WO2006082612A1 true WO2006082612A1 (ja) | 2006-08-10 |
Family
ID=36777007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/001319 WO2006082612A1 (ja) | 2005-01-31 | 2005-01-31 | Rfidキャリアセンス方法及び,これを用いるrfidシステム |
Country Status (6)
Country | Link |
---|---|
US (1) | US8531271B2 (ja) |
EP (1) | EP1845630B1 (ja) |
JP (1) | JP4336379B2 (ja) |
DE (1) | DE602005024620D1 (ja) |
TW (1) | TWI285844B (ja) |
WO (1) | WO2006082612A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4537248B2 (ja) * | 2005-04-06 | 2010-09-01 | 富士通株式会社 | キャリアセンス方法及び送受信装置 |
US20090134977A1 (en) * | 2007-11-28 | 2009-05-28 | Agere Systems Inc. | Method and apparatus for RFID device coexistance |
JP5269496B2 (ja) * | 2008-06-25 | 2013-08-21 | 新日鐵住金株式会社 | 焼結機のパレット位置認識装置および漏風検知装置 |
US20100156607A1 (en) * | 2008-12-19 | 2010-06-24 | Thomas Lankes | Method for activating an RFID antenna and an associated RFID antenna system |
US9443121B2 (en) | 2014-03-31 | 2016-09-13 | Symbol Technologies, Llc | Locally-powered, polarization-insensitive antenna for RFID reader, and RFID system for, and method of, scanning item tags with one or more such antennas |
US9760749B2 (en) | 2014-10-13 | 2017-09-12 | Avery Dennison Retail Information Services, Llc | Reduce inlay pitch singulation |
US10872311B2 (en) * | 2017-09-11 | 2020-12-22 | Walmart Apollo, Llc | Systems and methods of tracking objects in a retail store utilizing mobile RFID tag transmitter systems |
CN112152673B (zh) * | 2020-09-02 | 2021-04-13 | 北京易路行技术有限公司 | 天线干扰下cpc卡交易测试方法及装置 |
EP4358422A1 (en) * | 2022-10-18 | 2024-04-24 | Nokia Technologies Oy | Configuring antenna polarizations |
Citations (5)
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JPH1075196A (ja) * | 1996-08-30 | 1998-03-17 | Sharp Corp | 移動体識別装置及びダイバーシティ方法 |
JPH10293824A (ja) * | 1997-04-18 | 1998-11-04 | Omron Corp | 識別システム及びデータ読取装置 |
JP2000307466A (ja) * | 1999-04-20 | 2000-11-02 | Ueda Japan Radio Co Ltd | 移動体識別装置及び移動体の識別方法 |
JP2001111448A (ja) * | 1999-10-14 | 2001-04-20 | Hitachi Kokusai Electric Inc | カード型無線機 |
JP2003506948A (ja) * | 1999-07-29 | 2003-02-18 | マルコニ データ システムズ リミテッド | 圧電タグ |
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US6255993B1 (en) * | 1999-07-08 | 2001-07-03 | Micron Technology, Inc. | Right and left hand circularly polarized RFID backscatter antenna |
US6617962B1 (en) * | 2000-01-06 | 2003-09-09 | Samsys Technologies Inc. | System for multi-standard RFID tags |
US7026935B2 (en) * | 2003-11-10 | 2006-04-11 | Impinj, Inc. | Method and apparatus to configure an RFID system to be adaptable to a plurality of environmental conditions |
JP2006025322A (ja) * | 2004-07-09 | 2006-01-26 | Funai Electric Co Ltd | 放送受信機 |
-
2005
- 2005-01-31 TW TW094102876A patent/TWI285844B/zh not_active IP Right Cessation
- 2005-01-31 DE DE602005024620T patent/DE602005024620D1/de active Active
- 2005-01-31 EP EP05709482A patent/EP1845630B1/en not_active Expired - Fee Related
- 2005-01-31 WO PCT/JP2005/001319 patent/WO2006082612A1/ja active Application Filing
- 2005-01-31 JP JP2007501450A patent/JP4336379B2/ja not_active Expired - Fee Related
-
2007
- 2007-07-27 US US11/878,925 patent/US8531271B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH1075196A (ja) * | 1996-08-30 | 1998-03-17 | Sharp Corp | 移動体識別装置及びダイバーシティ方法 |
JPH10293824A (ja) * | 1997-04-18 | 1998-11-04 | Omron Corp | 識別システム及びデータ読取装置 |
JP2000307466A (ja) * | 1999-04-20 | 2000-11-02 | Ueda Japan Radio Co Ltd | 移動体識別装置及び移動体の識別方法 |
JP2003506948A (ja) * | 1999-07-29 | 2003-02-18 | マルコニ データ システムズ リミテッド | 圧電タグ |
JP2001111448A (ja) * | 1999-10-14 | 2001-04-20 | Hitachi Kokusai Electric Inc | カード型無線機 |
Non-Patent Citations (1)
Title |
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See also references of EP1845630A4 * |
Also Published As
Publication number | Publication date |
---|---|
US8531271B2 (en) | 2013-09-10 |
JPWO2006082612A1 (ja) | 2008-06-26 |
EP1845630A1 (en) | 2007-10-17 |
TW200627291A (en) | 2006-08-01 |
US20070279193A1 (en) | 2007-12-06 |
EP1845630A4 (en) | 2008-12-24 |
TWI285844B (en) | 2007-08-21 |
EP1845630B1 (en) | 2010-11-03 |
JP4336379B2 (ja) | 2009-09-30 |
DE602005024620D1 (de) | 2010-12-16 |
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