• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a system for identifying objects in a predetermined space, comprising a plurality of RFID transponders (1) carried by the objects to be identified and an RFID interrogator (2) for reading information contained in transponders. The interrogator is able to transmit at least one UHF interrogation signal (S1) to the transponders. In a first mode of operation, the transponders are powered by said interrogation signal and, in response to the interrogation signal, return a UHF response signal (S2) by retromodulation to the interrogator. The system further comprises at least one radiofrequency power source (3) present in a zone (Zi) of said space and capable of transmitting an energy signal (S3) to the transponders of the zone. In a second mode of operation, the transponders (1) present in the zone are fed by the energy signal (S3), and, in response to the interrogation signal (S1), sends back a response signal.
    公开号:FR3015729A1
    申请号:FR1363317
    申请日:2013-12-20
    公开日:2015-06-26
    发明作者:Cyril Catalanotto；Michel Talon
    申请人:Tagsys SAS；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to a system for identifying objects equipped with RFID tags or transponders. The system of the invention finds many applications. It can for example be used to identify the objects present in a warehouse or a store or in a specific area thereof, for example in a shelf or on a shelf. It can also be used to identify objects on a cash register treadmill in a warehouse or on a conveyor in a warehouse or objects crossing a security portal at the exit of a store. STATE OF THE ART RFID tags (for Radio Frequency IDentity in English) are currently widely used in the identification and location of objects systems.
    [0002] Such a system conventionally comprises an interrogator or RFID reader and a plurality of RFID tags attached or attached to the objects to follow. The RFID interrogator generally transmits a UHF signal, called the interrogation signal, to RFID tags. The frequency band of the interrogation signal is conventionally between 860 MHz and 960 MHz. In response to this interrogation signal, the RFID tags return by back modulation (or "backscattering" in English) a response signal to the RFID interrogator.
    [0003] The use of UHF signals has the following advantages: high communication speed, ability to communicate with a large number of tags simultaneously, high reading distance. UHF signals spread far, far. But they can also "bounce" when they encounter an obstacle. These many rebounds then create either black areas where reading tags, even close, is impossible, or white areas where reading tags, even very far, becomes possible. Consequently, when it is desired to read tags on a defined and limited area, for example in a tunnel disposed on a conveyor carrying products provided with tags, the use of UHF signals in the tunnel can lead to non-readings in the tunnel. tunnel (black areas) and unwanted readings outside the tunnel (white areas). The RFID tags used in these systems are conventionally passive tags, namely that they do not include a battery or energy storage means. These tags use the energy contained in the interrogation signal carrier to return a modulated version of the interrogation signal to the RFID interrogator. At least a portion of the interrogation signal energy is recovered by a power collection device to power the tag components. Passive tags have the advantage of being light and inexpensive and having a long life.
    [0004] However, the combined use of UHF interrogation signals and passive tags has the following drawbacks. Although the reading distance with UHF signals is high, it is not possible to feed the passive tags beyond a predetermined distance which is smaller than the reading distance. Beyond this so-called supply distance, the tag does not recover enough energy from the carrier of the interrogation signal to power its components. Therefore, the reading distance of these tags is limited by the feed distance. Moreover, as previously stated, such a system is not suitable for reading RFID tags in a restricted area of a warehouse or warehouse because of the long range of UHF signals and their propagative mode. The short feed distance of passive tags with UHF signals can be compensated by multiplying the number of RFID interrogators in the warehouse or warehouse. This solution is however expensive and does not overcome the problem of black areas and white areas, so solve the second problem namely, reading tags in a small area in the warehouse or store. To alleviate all or part of these problems, it is known from document US Pat. No. 7,812,725 a system comprising an interrogator or RFID reader for reading passive tags and power nodes (or "power nodes" in English) distributed over the area to be covered to feed local RFID tags to read. The power nodes power command tags around them by transmitting a radiofrequency signal said power. The space to be covered is for example divided into zones and each zone is equipped with a power node. The tags are equipped with energy collection means for recovering the energy of the power signal transmitted by the power node present in its zone. The power signal transmitted by the power nodes is a signal having a reduced range limited to the area to be covered.
    [0005] The power nodes are remotely controlled by the reader. To identify the tags present in a given zone, the reader turns on the power node of said zone. Then, only the tags of this zone are fed and these then emit a data signal to the RFID reader. The frequency of the data signal is greater than that of the supply signal so that the data signal can be received by the reader which is farther from the tag than the power node.
    [0006] This system makes it possible to make an inventory of all the tags of the system by lighting up all the power nodes and also to identify the tags present in a given zone by lighting only the power node of this zone. However, this system has the following drawbacks: 1) an identification of the set of RFID tags requires the ignition of all the power nodes of the system; 2) the reader does not transmit an interrogation signal to the tags; the system therefore does not allow to write data in the tag; the tag essentially comprises a unique number preprogrammed at the factory and it is not possible to write via the reader other information in the tag, such as information related to the tagged object; the reader therefore needs to be connected to a database in which this other information is stored; 3) the system does not allow the use of passive tags powered by the UHF signal transmitted by the RFID reader; 4) the system relies on a proprietary communication protocol and therefore does not allow the use of an RFID reader and passive passive tags compliant with the ePC UHF Gen2 standard; and 5) the system can not operate in the absence of the power nodes. SUMMARY OF THE INVENTION The object of the invention is to overcome all or some of the aforementioned drawbacks. For this purpose, the invention proposes a system for identifying objects in a predetermined space, said system comprising a plurality of RFID transponders carried by the objects to be identified and an RFID interrogator for reading information contained in the transponders, said interrogator RFID being able to transmit at least one UHF interrogation signal to the transponders and, in response to said interrogation signal, each of said transponders being able, according to a first operating mode, to be powered by said interrogation signal and returning a UHF (Ultra High Frequency) response signal to said RFID interrogator by backscatterring (English language) of the wave of said interrogation signal. The term "transponder" here refers to passive tags or battery-assisted passive tags (or BAP tags for Battery-Assisted Passive in English language) able to return, in response to an interrogation signal, a response signal by back-modulation of the wave of said interrogation signal. According to the invention, the system furthermore comprises at least one radiofrequency power supply present in a predetermined geographical zone of said space and able to emit an energy signal intended for the transponders present in the predetermined geographical zone, said signal of energy and said interrogation signal belonging to distinct frequency bands, the transponders present in said predetermined geographical zone being capable, in a second mode of operation, of being powered by said energy signal, and, in response to the signal of interrogation issued by the RFID interrogator, to return a UHF response signal to said RFID interrogator by retromodulation of said interrogation signal. According to a particular embodiment, the energy signal is a high frequency (HF) or low frequency (BF) signal having a range limited to the zone associated with said radiofrequency power supply. This embodiment is particularly advantageous when the space has adjacent areas close to each other or when the location accuracy must be important (from a few centimeters to a few tens of centimeters). In this embodiment, the frequency of the energy signal is for example equal to 13.56 MHz or 27 MHz in HF or 125 kHz in BF. More generally, the frequency of this signal belongs to the ISM bands. This embodiment has the advantage of avoiding rebounds of the energy signal because of the non-propagative properties of low frequency signals, and thus to overcome black areas and white areas.
    [0007] According to a variant, the energy signal is a UHF or SHF signal having a range substantially covering the zone associated with said radiofrequency power supply. This embodiment can be used when the areas of the space to be covered are a few meters apart (corresponding to several times the wavelength of the energy signal) or when the location accuracy can be moderate (from the order of the meter or a few meters). The energy signal can then propagate slightly beyond the desired area without triggering the reading of a transponder from another area. In this variant, the frequency of the energy signal is for example equal to 433 MHz or 2.4 GHz.
    [0008] According to a particular embodiment, in said first mode of operation, said RFID interrogator transmits said interrogation signal with a first power level so that all the transponders present in said predetermined space can be supplied with energy by said signal. query. This first mode of operation is used to identify all the tags of the predetermined space without having to use said radiofrequency power source (equivalent to a power node). This first mode of operation is for example implemented to make an inventory of all objects with transponders present in a warehouse or a store. In the second mode of operation, the RFID interrogator 30 transmits the interrogation signal with a second power level, said second power level being lower than said first power level. In this second mode of operation, said radiofrequency power source supplies the transponders present in the geographical area associated with it. This second mode of operation is more particularly dedicated to identifying the tags present in a particular area of the space, so for example to locate the tags in a warehouse or 10 store. According to a particular embodiment, the ratio between the first power level and the second power level is greater than 10, advantageously greater than 50 and preferably greater than 100. The advantage of the system of the invention is that it can be realized from an existing and standard identification system essentially comprising an RFID interrogator capable of communicating with a plurality of transponders. According to a particular embodiment, the interrogation signal and the response signal conform to the UHF Gen2 ePC standard, which is the most widespread standard, or the ISO 18000-6 standard. According to a particular embodiment, each of the transponders comprises a first antenna for receiving the interrogation signal and sending back the response signal, an RFID chip able to be powered by the interrogation signal and to send back in response to said signal. interrogation, a response signal, a second antenna for receiving the energy signal, and a power collection device for, in said second mode of operation, generating a power signal from said energy signal and for powering said RFID chip with said power signal. In a variant, said first and second antennas are replaced by a dual band antenna capable of receiving the energy signal and the interrogation signal. According to a particular embodiment, the RFID interrogator is able to transmit a UHF control signal for controlling an on / off state of said at least one radiofrequency power supply. Advantageously, the control signal also controls the power level of the energy signal. According to a particular embodiment, said control signal is in accordance with the ePC UHF Gen2 standard or the ISO 18000-6 standard. According to a particular embodiment, said at least one radiofrequency power supply comprises an energy signal generator, a first antenna for transmitting the energy signal generated by said generator, a second antenna for receiving the control signal. and a control circuit for controlling said energy signal generator according to said control signal.
    [0009] Advantageously, the radiofrequency power source further comprises an energy collection device for collecting ambient energy and a storage device for storing the collected energy, avoiding any need for wiring or connection to the mains. The energy collection device of the radiofrequency source is for example a photovoltaic cell or an energy recovery circuit 10 of the ambient electromagnetic field, for example GSM 1.8 GHz, Wi-Fi 2.4 GHz, Wifi 5.8GHz. Other advantages may still be apparent to those skilled in the art upon reading the examples below, illustrated by the appended figures, given by way of illustration. Brief Description of the Figures - Figure 1 shows a schematic overview of a system according to the invention; FIG. 2 is a schematic view of a transponder belonging to the system of FIG. 1; FIG. 3 represents a schematic view of a radiofrequency power source belonging to the system of FIG. 1; FIG. 4 illustrates a first mode of operation of the system of the invention; a second embodiment of FIG. 5 illustrates the operation of the system of the invention; Figure 6 illustrates a first application of the system of the invention; and Figure 7 illustrates a second application of the system of the invention. DETAILED DESCRIPTION OF THE INVENTION With reference to FIG. 1, the system of the invention comprises a plurality of RFID transponders 1 carried by the objects to be identified, an RFID interrogator 2 capable of transmitting a UHF interrogation signal, denoted S1, for transponders and radiofrequency power sources 3 distributed in zones Zi of the space covered by the system and intended to transmit, on command and in a particular mode of operation, an energy signal, denoted S3, for supply the transponders present in the zones Zi locally with energy. The objects to be identified are present in a place of storage or sale, for example a warehouse or a store, defining a space. Zones Zi are defined in this space and are each equipped with a radiofrequency power source 3. These zones Zi correspond to areas where it is sought to identify or locate objects with transponders. According to the invention, the RFID interrogator 2 is capable of transmitting an interrogation signal S1 which can be received by all the RFID tags present in said space. This signal is long range and its frequency is present in the UHF band, for example in the 860 MHz-960 MHz band. The signal range of the energy signal S3 emitted by each radiofrequency power source 3 is smaller and is preferably limited to the zone Zi in which the radiofrequency power source 3 is present. In a preferred embodiment, the energy signal is a Low Frequency (BF) or High Frequency (HF) signal with a much more limited range than the interrogation signal S1. As mentioned above, the transponders 1 are tags which, in response to an interrogation signal S1 sent by the RFID interrogator, send a response signal S2 to the interrogator RFID by retromodulation of the wave of said interrogation signal. . Advantageously, the interrogation signal S1 and the response signal S2 conform to the most widespread standard, namely the ePC UHF Gen2 standard, or the ISO 18000-6 standard. The tags are readable by usual means, even in the absence of radio frequency power sources as in the first mode of operation.
    [0010] According to the invention, the transponders are capable of two modes of operation. In a first mode of operation, the transponders are powered by the energy contained in the interrogation signal S1.
    [0011] In a second mode of operation, the transponders are powered by the energy contained in the energy signal S3. For this purpose, each transponder 1 comprises means able to selectively collect energy from the interrogation signal S1 or energy from the energy signal S3. An example of a transponder according to the invention is shown diagrammatically in FIG. 2. This transponder comprises - a UHF antenna, referenced 10, for picking up the interrogation signal S1, - an RFID chip 11, such as the chip EM4325 manufactured by the company EM Microelectronic, connected to the antenna 10 and comprising means for collecting energy of the interrogation signal S1 and means for generating the response signal S2 by retromodulation of the signal waveform. interrogation, - an HF or BF antenna, referenced 12, for sensing the energy signal S3, - a power collection circuit 13 connected to the antenna 12 for collecting the energy of the energy signal and generating a ALIM power signal for the chip 11 when it can not be powered by the interrogation signal S1. The antenna 10 is for example a half-wave dipole with respect to the wavelength of the interrogation signal. In the case of HF or BF energy signals, the antenna 12 is for example a magnetic loop comprising one or more windings and if necessary a resonant capacitor at a frequency close to the frequency of the energy signal S3. The energy collection circuit 13 is, for example, a diode rectifier circuit connected to the antenna 12. The radiofrequency power supply sources 3 of the system are advantageously controlled by the RFID interrogator 2. For this purpose, the interrogator RFID 2 is arranged to deliver a UHF control signal, denoted S4, for controlling an on / off state / power level of the radiofrequency power supply sources 3. Advantageously, this control signal S4 conforms to the ePC UHF Gen2 standard or the ISO 18000-6. Each radio frequency power source is then controlled as a tag. A radiofrequency power source 3 is shown schematically in FIG. 3. It essentially comprises an energy signal generator 30 and an antenna 31 for transmitting them. In the case of BF or HF energy signals, the generator 30 is a BF or HF generator and the antenna 31 is a magnetic loop. As indicated above, the radiofrequency power source 3 is advantageously controlled by a UHF control signal S4 emitted by the RFID interrogator 2. For this purpose, the power source advantageously comprises an antenna 32 for sensing the control signal 4 and a control circuit 33. The control circuit has an input for receiving the signal picked up by the antenna 32 and an output for the on / off state / power level of the generator 30. The control signal is for example a UHF signal conforming to the ePC UHF Gen2 standard and the control circuit 33 is an RFID chip. To control the on / off state of the generator 30, the control signal S4 comes for example to write a value of 0 or 1 in a memory of the RFID chip 33. The value 0 turns off the generator 30 and the value 1 turns it on.
    [0012] Advantageously, the radiofrequency power source 3 is autonomous in energy. For this purpose, it comprises a power collection device 34 for collecting ambient energy and a storage device 35 for storing the collected energy. The energy collection device supplies voltage to the generator 30 and the control circuit 33. The two modes of operation of the system are now described in more detail. The first mode of operation of the system of the invention is illustrated in FIG. 4. In this mode of operation, the transponders 1 are powered by the interrogation signal S 1 sent by the RFID interrogator 2. The radio frequency power sources 3 are extinct. This mode of operation is advantageously implemented when one wants an inventory of all tags. Therefore, in this mode of operation, the interrogation signal Si is advantageously transmitted with a power level P1 sufficiently high so that each transponder can extract enough energy from the interrogation signal S1 to supply the transponder. The RFID interrogator 2 is advantageously positioned in the center of the space to be covered (that is to say in the center of the store or the warehouse) to limit the power level P1 to be supplied. In the second mode of operation illustrated in FIG. 5, the transponder is powered by the energy signal S3 delivered by the radiofrequency power source 3 of the zone Zi in which the tag is present. In this mode of operation, the RFID interrogator can transmit the interrogation signal S1 with a power level P2 less than P1 because the transponder is no longer powered by the interrogation signal S1 but by the energy signal S3. . As mentioned above, the energy signal S3 is advantageously an HF or BF signal having a more limited range than the interrogation signal S1. It is intended to supply energy to a particular zone Zi of the total space. The ratio between the power level P1 and the power level P2 is greater than 10. It is advantageously greater than 50 and preferably greater than 100. According to an exemplary embodiment, in the first mode of operation, the interrogation signal S1 is emitted with a power level P1 equal to 30 dBm and, in the second mode of operation, it is emitted with a power level P2 of 10 dBm, a ratio of 100 between the two power levels. In the second mode of operation, the RFID interrogator 1 turns on each of the radio frequency power sources in turn to identify the transponders present in the associated zone. Since the position of the various radio frequency power sources is known to the RFID interrogator, it is possible to locate the zone in which a transponder is present. The transponders that can be used in the system of the invention are class 0 tags (read-only passive tags), class 1 tags (passive tags with additional functions, in particular memory write) or class 2 tags (passive tags assisted by drums). Particular applications of the system of the invention are described below. In a first application illustrated in Figure 6, the system of the invention is installed in a store and is used both at the cash registers for the payment of items with transponders and the outputs of the store to avoid theft . It can of course also be used to perform a global or partial inventory (by zones) of store items as described above. In these applications, the system of the invention operates according to the second mode of operation. The RFID interrogator 2 transmits an interrogation signal S1 with a power level P2 such that the transponders present in the magazine can not be powered by the interrogation signal S1. The interrogation signal is for example transmitted with a power level equal to 10 or 15 dBm and it is preferably placed in the center of the magazine and is fixed to the ceiling thereof. A radiofrequency power source 3 is disposed at each cash register. The antenna 31 for transmitting the energy signal S3 is, for example, a magnetic loop placed at the level of the treadmill of the body. This loop defines a zone in which the transponders 1 are powered by the energy signal 3. Outside this zone, the transponders are not powered. The customer has his items with transponders on the treadmill. In response to the interrogation signal S1 transmitted by the RFID interrogator, the transponders which are powered by the energy signal S3 return a response signal S2 to the interrogator. The items to be paid are therefore identified by the RFID interrogator. The computer system managing the RFID infrastructure then communicates payment information to the cash register for example through the store's computer network. With this system, the cashier does not need to scan the barcode of items. For theft protection, a radiofrequency power source 3 is disposed at each exit gantry of the magazine. The transmitting antenna 31 of the energy signal S3 is arranged to cover only the area between the two vertical panels of the gantry. Transponders which have not been deactivated at the cash register and which are supplied with power when they pass through the gantry send, in response to the interrogation signal S1 sent by the RFID interrogator 2, a response signal S2 which then triggers an alarm. In another application illustrated in Figure 7, the system of the invention is used to identify items received or shipped to a warehouse. The warehouse has several lines for receiving or shipping items with transponders and arranged in cartons. Each line comprises a radiofrequency power source 3 for supplying the transponders present on said line. The transmission antenna 31 of the energy signal S3 is for example arranged at a conveyor portion of the line. If the radiofrequency power source 3 is on, all the transponders passing through this portion emit a response signal S2 in response to an interrogation signal S1. The RFID interrogator 2 can successively control the ignition of the RF power sources of the different lines via control signals S4. It can for example control, during a time period T1, for example at the beginning of the day, the ignition of the radiofrequency power source of the goods reception line and, during a time period P2, for example during the rest of the day. the day, the ignition of the radiofrequency power source of the shipping line of goods. Of course, the embodiments and applications described above are only exemplary. In the examples described, the energy signal S3 is preferably a BF or HF signal having a reduced range. As a variant, the signal S3 is a UHF or SHF signal whose range is greater but can be reduced by lowering the level of the power emitted or by using antennas providing a certain directivity to limit the range in certain directions. The use of such a signal does not allow to feed well delimited areas with well-controlled borders, but this does not pose a problem when the different areas to be fed are far from several meters, that is to say from the order of several wavelengths of the energy signal S3 or when a high accuracy of location is not required. In this variant, the transmission antenna 31 of the energy signal S3 is no longer a magnetic loop but an antenna of dimensions close to its wavelength, such as a quarter wave (of the "Ground" type. Plane "in English language) or an antenna offering a certain directivity, for example patch type with parasitic elements. The system of the invention offers numerous advantages among which: it does not need to replace the existing infrastructures with RFID interrogator and plurality of transponders communicating according to the ePC UHF Gen2 standard; - simple installation; - low cost; - it does not need to turn on all radio frequency power sources to identify all transponders (inventory) .10
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. An object identification system in a predetermined space, said system comprising a plurality of RFID transponders (1) carried by the objects to be identified and an RFID interrogator (2) for reading information contained in transponders, said RFID interrogator being able to transmit at least one UHF interrogation signal (S1) to the transponders and, in response to said interrogation signal, each of said transponders being adapted, according to a first operating mode, to be powered by said signal interrogating (S1) and returning a UHF response signal (S2) to said RFID interrogator by retromodulating the wave of said interrogation signal, characterized in that it further comprises at least one radiofrequency power source ( 3) present in a predetermined geographical area (Zi) 20 of said space and able to emit an energy signal (S3) for the transponders present in the geographical area predetermined signal, said energy signal (S3) and said interrogation signal (S1) belonging to distinct frequency bands, the transponders (1) present in said predetermined geographical zone (Zi) being suitable, according to a second mode in response to the interrogation signal (S1) transmitted by the RFID interrogator, to return a UHF response signal (S2) to said RFID interrogator by retromodulation, to be powered by said energy signal (S3); of the wave of said interrogation signal.
    [0002]
    2. System according to claim 1, characterized in that the energy signal (S3) is an HF or BF signal.
    [0003]
    3. System according to claim 1, characterized in that the energy signal (S3) is a UHF or SHF signal.
    [0004]
    4. System according to any one of claims 1 to 3, characterized in that, in said first mode of operation, said RFID interrogator (2) transmits said interrogation signal (S1) with a first power level (P1) so that all transponders (1) present in said predetermined space are energized by said interrogation signal (S1), and in that in the second mode of operation the RFID interrogator (2) transmits the signal interrogation with a second power level (P2) lower than said first power level (P1) and said at least one radiofrequency power source (3) supplies transponders present in the geographical area in which said at least one radio frequency power source.
    [0005]
    5. System according to claim 4, characterized in that the ratio between the first power level (P1) and the second power level (P2) is greater than 10, preferably greater than 50 and preferably greater than 100.
    [0006]
    6. System according to any one of the preceding claims, characterized in that the interrogation signal (S1) and the response signal (S2) are in accordance with the ePC UHF Gen2 standard or the ISO 18000-6 standard.
    [0007]
    7. System according to any one of the preceding claims, characterized in that each of the transponders (1) comprises a first antenna (10) for receiving the interrogation signal (S1) and returning the response signal (S2), a RFID chip (11) capable of being powered by the interrogation signal and returning, in response to said interrogation signal, a response signal, a second antenna (12) for receiving the energy signal (S3) and a device energy harvesting device (13) for, in said second operating mode, generating a power signal from said energy signal (S3) and for supplying said RFID chip with said power signal.
    [0008]
    8. System according to any one of the preceding claims, characterized in that the RFID interrogator (2) is adapted to transmit a UHF control signal (S4) for controlling an on / off state of said at least one source of radio frequency power supply (3).
    [0009]
    9. System according to claim 8, characterized in that said control signal (S4) is in accordance with UPC standard UHF Gen2 or ISO 18000-6.
    [0010]
    10. System according to claim 8 or 9, characterized in that said at least one radiofrequency power source (3) comprises an energy signal generator (30), a first antenna (31) for emitting the signal of energy (S3) generated by said generator, a second antenna (31) for receiving the control signal (S4) and a control circuit (33) for controlling said energy signal generator according to said control signal (S4 ).
    [0011]
    The system of claim 10, characterized in that said at least one radiofrequency power source (3) further comprises an energy collection device (34) for collecting ambient energy and a storage device ( 35) to store the collected energy.
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    同族专利:
    公开号 | 公开日
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    FR3015729B1|2016-01-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20080150696A1|2006-12-21|2008-06-26|Bolander Jarie G|System for powering and reading RFID tags|
    WO2011159171A2|2010-06-11|2011-12-22|Trident Rfid Pty Ltd|A transponder, rfid system and methods of operation|WO2020174159A1|2019-02-28|2020-09-03|Asygn|Circuit for a passive radio identification tag operating in a uhf band and method for operating a circuit|
    WO2021186128A1|2020-03-18|2021-09-23|Asygn|Circuit for passive radio-frequency identification tag comprising a strain sensor and method for manufacturing a circuit|
    FR3024620A1|2014-08-01|2016-02-05|Tagsys|RFID TRANSPONDER INTERROGATION SYSTEM|
    WO2020081824A1|2018-10-17|2020-04-23|Vubiq Networks, Inc.|Multimode millimeter wave rfid systems and methods thereof|
    法律状态:
    2015-06-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-15| PLFP| Fee payment|Year of fee payment: 3 |
    2016-11-25| PLFP| Fee payment|Year of fee payment: 4 |
    2018-07-02| PLFP| Fee payment|Year of fee payment: 5 |
    2019-12-27| PLFP| Fee payment|Year of fee payment: 7 |
    2020-12-22| PLFP| Fee payment|Year of fee payment: 8 |
    2021-12-30| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1363317A|FR3015729B1|2013-12-20|2013-12-20|OBJECT IDENTIFICATION SYSTEM WITH RFID TAGS|FR1363317A| FR3015729B1|2013-12-20|2013-12-20|OBJECT IDENTIFICATION SYSTEM WITH RFID TAGS|
    PCT/FR2014/053479| WO2015092333A1|2013-12-20|2014-12-19|System for identifying objects provided with rfid tags|
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