WO2022174251A1 - Système et procédé de collecte d'énergie dans des étiquettes - Google Patents

Système et procédé de collecte d'énergie dans des étiquettes Download PDF

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Publication number
WO2022174251A1
WO2022174251A1 PCT/US2022/070625 US2022070625W WO2022174251A1 WO 2022174251 A1 WO2022174251 A1 WO 2022174251A1 US 2022070625 W US2022070625 W US 2022070625W WO 2022174251 A1 WO2022174251 A1 WO 2022174251A1
Authority
WO
WIPO (PCT)
Prior art keywords
rfid
signal
signals
rfid tag
energy
Prior art date
Application number
PCT/US2022/070625
Other languages
English (en)
Inventor
Manuel A. Soto
Adam S. Bergman
Original Assignee
Sensormatic Electronics, LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sensormatic Electronics, LLC filed Critical Sensormatic Electronics, LLC
Publication of WO2022174251A1 publication Critical patent/WO2022174251A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • G06K19/0707—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation
    • G06K19/0708—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation the source being electromagnetic or magnetic
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G08B13/2417—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428—Tag details
    • G08B13/2431—Tag circuit details
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout

Definitions

  • the present disclosure relates generally to security solutions, and in particular relates to a system and method for harvesting energy in tags.
  • Radio-frequency identification (RFID) tags are widely used to associate a product with an identification code or additional information.
  • RFID tags are one of many implementations of RFID tags.
  • Other implementations include, but are not limited to, use of RFID tags for identification of books in a library or use of RFID tags as identification of employees in an office.
  • the RFID tag captures radio frequency (RF) signals emitted by RFID reader.
  • the RFID tag continues to capture RF signals from the RFID reader until a threshold amount of energy is stored within a capacitor present in the RFID tag.
  • the threshold amount of energy stored in the capacitor enables the RFID tag to respond back with an RF response signal to the RFID reader.
  • the RFID reader then converts the RF response signal, received from the RFID tag, to usable data that enables identification of the details of the associated product.
  • an RFID tag can enter into a defeat mode, i.e., a mode where RF communication between the RFID tag and the RFID reader is and/or gets blocked.
  • the reason for blockage in communication between RFID tag and the RFID reader may be placement of the RFID tag at a position where the RF signals fail to pass.
  • Some examples of such placement may include, but are not limited to, placement of the RFID tag in a dense bag, placement of the RFID tag in a container that contains metal plates or foils which may lead to development of a partial faraday cage, or placement of the RFID tag under an arm, among others.
  • a mischievous shopper may knowing utilize this drawback of conventional RFID systems to fulfill his/her wrong intent.
  • one of the reasons for failure of communication that results in the RFID tag entering the defeat mode is lack of energy present within the RFID tag.
  • the defeat mode is developed because there is a weak communication or negligible communication between the RFID tag and the RFID reader, which results in insufficient energy generation within the RFID tag for generating the RF response signal.
  • a system for harvesting energy in a radio frequency identification (RFID) tag comprises: an RFID tag having an antenna configured to receive Acousto-Magnetic (AM) signals and having an energy harvesting element configured to harvest energy derived from the AM signals.
  • RFID radio frequency identification
  • a method of harvesting energy in a radio frequency identification (RFID) tag comprises: receiving Acousto-Magnetic (AM) signals by the RFID tag; and harvesting energy derived from the AM signals in an energy harvesting element of the RFID tag.
  • AM Acousto-Magnetic
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 illustrates a system 10 for harvesting energy in one or more RFID tags, according to some aspects.
  • FIG. 2 illustrates a block diagram of an RFID tag of the system of FIG. 1, according to some aspects.
  • FIG. 3 illustrates an operation of an RFID tag with AM exciters and an RFID reader within the system of FIG. 1, according to some aspects.
  • FIG. 4 illustrates a flow diagram of a method of operation of an RFID tag within a controlled environment, according to some aspects.
  • the present aspects include apparatus and methods to enable an RFID tag to respond immediately to an RF reader without waiting to continuously capture RF signals for storing the threshold energy. For instance, in a retail store security system, detection of an RFID tag at an exit RFID reader may be limited if the RFID tag enters a defeat mode. Aspects of the present disclosure are configured to enable the RFID tag to harvest power from the Acousto Magnetic system at the exit of the store. Thus, the present aspects may improve readability of an RFID tag when in proximity to the exit of the store.
  • FIG. 1 a system 100 for harvesting energy in one or more RFID tags 102 is shown, according to an example implementation.
  • the system 100 includes a controlled environment 10, such as a space in which one or more RFID tags 102 are being displaced in the direction 104.
  • the controlled environment 10 may represent a retail store, wherein the RFID tags 102 may be displaced towards an exit, which may occur during checkout process or when a person or device carries a product having the RFID tag 102 toward the exit.
  • FIG. 1 discloses four RFID tags 102 for illustration purpose, the current disclosure is not limited to the usage of only four RFID tags 102.
  • the displacement of the RFID tags 102 may be enabled by a person by way of carrying them in hand or through a handbag, a trolley, or a container, among other examples.
  • the RFID tags 102 may be carried by any machined components such as but not limited to a conveyor belt or a mechanical cart.
  • the controlled environment 10 further comprises an energy harvesting zone 106 and a reading zone 108.
  • the energy harvesting zone 106 is created by one or more acousto-magnetic (AM) exciters 110.
  • the coverage of energy harvesting zone 106 may depend on the number of AM exciters 110 along with their operating frequencies.
  • the reading zone 108 is created by one or more RFID readers 112 enabled for sending and receiving one or more RF signals, such as for identification of the RFID tags 102. Similar to AM exciters 110, the coverage of RFID reader 112 depends on its operating frequency.
  • the AM exciters 110 are enabled to send AM signals, which are radio frequency (RF) waves sent in pulses per second.
  • the AM signals are sent in order to energize the RFID tags 102.
  • the AM exciters 110 may operate at 58 KHz and AM signals are transmitted in pulses or bursts between 50 and 90 times a second.
  • the AM signals referred in the present disclosure are pulses or bursts of RF waves having a predetermined frequency (e.g. 58 KHz) with a repetition rate (e.g., 50 Hz, 60 Hz, 75 Hz or 90 Hz), with a pause between successive bursts or pulses. It should be understood that other frequencies and repetition rates may be used that are compatible with an AM tag reading system.
  • the RFID reader 112 is configured to send or transmit one or more outbound RF signals, and to receive one or more inbound RF signals.
  • the inbound RF signal may be a modulated, backscattered signal from the RFID tag 102 that has substantially the same frequency as the outbound RF signal or a different frequency from the outbound RF signal.
  • the AM exciters 110 energize the RFID tags 102 with the AM signals so as to boost the energization of the RFID tags 102 prior entering the reading zone 108 for identification, thereby enabling a faster and stronger communication with the RFID reader(s) 112.
  • the fast communication between the RFID tags 102 and the RFID reader 112 is because the RFID tags 102 are already energized for communication by the AM exciters 110, as opposed to having to wait to receive one or more outbound RF signals from the RFID reader 112.
  • the RFID tag 102 when the energized RFID tag 102 receives the outbound RF signal from the RFID reader 112, the RFID tag 102 gives an immediate response back, e.g., without taking any time for harvesting energy from additional outbound RF signals, thereby generating the inbound RF signal for the RFID reader 112. Additionally, since the RFID tag 102 is already energized, it is enabled to receive and respond to weak outbound RF signals from the RFID reader 112. The response generated by the RFID tag 102, i.e. the inbound RF signal, is captured by the RFID reader 112 and is further processed for identification purposes.
  • the identification of the RFID tag may be compared to RFID tag identifiers associated with a sales transaction in order to determine whether the product to which the RFID tag 102 is attached has been paid for. If not, then the RFID reader 112 and/or another component of a security system may generate an alarm, e.g., a visible output (cause a light to flash) and/or an audible output (a sound broadcast by a speaker). If so, then the RFID reader 112 and/or another component of a security system may refrain from generating the alarm and/or may record information about the RFID tag 102 and/or the associated product being detected by the RFID reader 112. Such information may include, but is not limited to, a date, a time, an RFID reader identifier, an RFID tag identifier, and/or an associated product identifier.
  • the RFID tag 102 comprises an integrated circuit 202, an antenna 204, a shield 206, and an energy harvesting element 208.
  • the shield 206 is made up of a protective material which holds and protects the integrated circuit 202, the antenna 204, and the energy harvesting element 208 together.
  • the antenna 204 may be configured to operate for performing multiple functions. First, the antenna 204 may capture the AM signals transmitted by the AM exciter 110 for harvesting energy within the RFID tag 102. Second, the antenna 204 may transmit the energy received from the AM signals to the energy harvesting element 208. Third, the antenna 204 may capture and send RF signals, e.g., the outbound RF signal and the inbound RF signal, for communication between the RFID tag 102 and the RFID reader 112. In an aspect, the antenna 204 may be of any variety of antenna types, such as but not limited to a dipole antenna, a loop antennas, a slot antenna, or hybrids combining characteristics of these antenna types.
  • the energy harvesting element 208 may be configured to collect energy present in the AM signals via antenna 204 and charge the energy harvesting element 208.
  • the stored energy is sufficient to enable one or more operations of the RFID tag 102 with the RFID reader 112.
  • an output voltage of the energy storage device 208 is supplied to the integrated circuit 202 to send an inbound RF signal from the RFID tag 102 to the RFID reader 112.
  • the energy harvesting element 208 may include, but is not limited to, a storage capacitor or an array of storage capacitors, a battery, or an inductor.
  • the energy harvesting element 208 may further be combined with an energy storage battery, which may be powered by a storage capacitor or an array of storage capacitors.
  • the antenna 204 is connected to the integrated circuit 202 and is configured to receive outbound RF signals from the RFID reader 112 and send inbound RF signals to the RFID reader 112.
  • the integrated circuit 202 when the antenna 204 receives the outbound RF signal from the RFID reader 112, the integrated circuit 202 is activated to generate the inbound RF signal in response to the outbound RF signal.
  • the outbound RF signal, received by the antenna 204 may be an activation signal that has predetermined properties.
  • the outbound RF signal may be of a particular frequency, such as 8.2 MHz or 915 MHz.
  • the integrated circuit 202 may respond to the outbound RF signal with the predetermined properties by generating the response in the form of the inbound RF signal.
  • the inbound RF signal, transmitted by the antenna 204 may be broadcast within the controlled environment 10 where it may be received by the RFID reader 112.
  • the integrated circuit 202 in one aspect, is configured to respond to the outbound RF signal with a responsive RF signal, which serves as the inbound RF signal with the predetermined frequency for the RFID reader 112.
  • the inbound RF signal may indicate the presence of the RFID tag 102 within the reading zone 108.
  • the inbound RF signal includes identifying information of the RFID tag 102 that can be used to determine information about a product to which it is attached.
  • the integrated circuit 202 may transmit a serial number associated with the RFID tag 102 and the RFID reader 112 may access a database that associates that serial number with product information.
  • the RFID reader 112 may then determine, based on the received inbound RF signal, that the product along with the RFID tag 102 is within the range of the RFID reader 112, wherein the range of the RFID reader 112 may relate to an area.
  • the area may relate to an exit area of a retail store in which each product is attached with the RFID tag 102 having the details of the associated product along with its clearance status, i.e. sold or not sold.
  • the shield 206 may include any type of material and is based upon the application where the RFID tag 102 is to be implemented or operated.
  • the shield 206 may be a polymer, such as but not limited to a polyvinyl chloride (PVC).
  • PVC polyvinyl chloride
  • the shield 206 may be a textile.
  • FIG. 3 an operation of the RFID tag 102 with AM exciters 110 and an RFID reader 112 with the system 100 of FIG. 1 is shown, according to some aspects.
  • the same RFID tag 102, in FIG. 3 is shown across three timelines. Specifically, the RFID tag 102, from a first timeline till a third timeline, is being displaced in the direction 302.
  • the first timeline illustrates the RFID tag 102 placed outside the energy harvesting zone 106 and the reading zone 108.
  • a second timeline illustrates the RFID tag 102 within the energy harvesting zone 106, and the third timeline illustrates the RFID tag 102 within the reading zone 108.
  • the RFID tag 102 is neither subjected to any AM signals from the AM exciters 110 nor to any outbound RF signals from the RFID reader 112. Thus, the energy harvesting element 208 within the RFID tag 102 is not energized.
  • the RFID tag 102 as disclosed earlier in this disclosure is in the energy harvesting zone 106.
  • the antenna 204 of the RFID tag 102 receives AM signals in the form of RF waves in pulses, which enables the antenna 204 to energize the energy harvesting element 208 present within the RFID tag 102.
  • This process of sending AM signals by the AM exciters 110 in the form of pulsed RF waves enables the RFID tag 102 to harvest energy within the energy harvesting element 208.
  • the AM signals in the form of RF signals with 58 KHz pulses or bursts, are transmitted with a frequency of 90 Hz.
  • the RFID tag 102 receives or captures the outbound RF signal from the RFID reader 112 with the particular frequency.
  • the RFID reader 112 may transmit the outbound RF signal in the form of RF waves with a frequency of 8.2 MHz.
  • the antenna 204 of the RFID tag 102 receives the outbound RF signal from the RFID reader 112
  • the antenna 204 transfers the outbound RF signal to the integrated circuit 202.
  • the integrated circuit 202 of the RFID tag 102 is enabled to respond immediately after the receipt of the first outbound RF signal because the integrated circuit 202 is energized by the energy stored in the energy harvesting element 208.
  • the integrated circuit 202 and the energy harvesting element 208 circuit do not take time to charge or gather energy by the continuous reception of outbound RF signals.
  • the inbound RF signal transmitted by the RFID tag 102 is received by the RFID reader 112, which enables the RFID reader 112 to identify the RFID tag 102.
  • the energized RFID tag 102with the harvested energy from the AM signals can overcome the defeat modes or any situation where RF signals are blocked or weakened due to presence of material capable of blocking or weakening the RF signals.
  • the present disclosure provides a solution wherein the energy is harvested in the RF tags 102 by the reception of the AM signals.
  • the harvested energy is used for establishing the immediate communication between the RFID tag 102 and the RFID reader 112 or detector.
  • the RFID tag 102 receives a weak outbound signal, for example, the RFID tag 102 is enabled to transmit a strong inbound signal that can be received by the RFID reader 112.
  • FIG. 4 a flow diagram of an example of a method 400 of operation of an RFID tag 102 within a controlled environment 10 is shown, according to some aspects.
  • the RFID tag 102 is present in the controlled environment 10, which may be an enclosed space.
  • the controlled environment 10 may represent a retail store, wherein the RFID tags 102 may be displaced towards an exit.
  • the RFID tag 102 at block 402, though present within the controlled environment 10, is not placed or present within the energy harvesting zone 106 and the reading zone 108, thus the RFID tag 102 is not subjected to any signals from the AM exciters 110 or the RFID reader 112.
  • the RFID tag 102 comprises an integrated circuit 202, an antenna 204, a shield 206, and an energy harvesting element 208 as described above.
  • the RFID tag 102 enters or is present within the energy harvesting zone 106.
  • the energy harvesting zone 106 is created by one or more AM exciters 110, which are configured to transmit AM signals. Therefore, the antenna 204 of the RFID tag 102 may receive AM signals in the form of RF waves in pulses which enables the antenna 204 to energize the energy harvesting element 208 present within the RFID tag 102.
  • the energization of the energy harvesting element 208 results from harvesting energy within the energy harvesting element 208 from the AM signals, where the harvested energy may be utilized by the integrated circuit 202.
  • the RFID tag 102 enters or is present within the reading zone 108.
  • the reading zone 108 is created by one or more RFID readers 112.
  • Each RFID reader 112 is configured for transmitting one or more outbound RF signals, and for receiving one or more inbound RF signals, for identification of the RFID tags 102.
  • the antenna 204 of the RFID tag 102 with the energized energy harvesting element 208, may receive an outbound RF signal transmitted by the RFID reader 112.
  • the received outbound RF signal may have predetermined wave properties, i.e., a predetermined wave frequency, recognized by the integrated circuit 202 as a trigger for generating an inbound RF signal.
  • the outbound RF signal may be of a particular frequency, such as 8.2 MHz or 915 MHz.
  • the integrated circuit 202 is activated to generate the response in the form of the inbound RF signal in response to the outbound RF signal.
  • the antenna 204 of the RFID tag 102 receives the outbound RF signal from the RFID reader 112
  • the antenna 204 transfers the outbound RF signal to the integrated circuit 202.
  • the integrated circuit 202 may respond to the outbound RF signal with the predetermined properties by generating the response in the form of the inbound RF signal.
  • the inbound RF signal, transmitted by the antenna 204 may be broadcast within all or a portion of the controlled environment 10 where it may be received by the RFID reader 112.
  • the inbound RF signal transferred by the RFID tag 102 is received by the RFID reader 112 which enables the RFID reader 112 to identify the RFID tag 102.
  • the identification of the RFID tag may be compared to RFID tag identifiers associated with a sales transaction in order to determine whether the product to which the RFID tag 102 is attached has been paid for. If not, then the RFID reader 112 and/or another component of a security system may generate an alarm, e.g., a visible output (cause a light to flash) and/or an audible output (a sound broadcast by a speaker).
  • the RFID reader 112 and/or another component of a security system may refrain from generating the alarm and/or may record information about the RFID tag 102 and/or the associated product being detected by the RFID reader 112.
  • information may include, but is not limited to, a date, a time, an RFID reader identifier, an RFID tag identifier, and/or an associated product identifier.
  • the present aspects may overcome the problem of a defeat mode disabling communication between the RFID tag 102 and the RFID reader 112.
  • the following numbered aspects include addition examples of the present disclosure, and are illustrative only and may be combined with other teachings described herein, without limitation.
  • a system for harvesting energy in a radio-frequency identification (RFID) tag comprising: an RFID tag having an antenna configured to receive Acousto- Magnetic (AM) signals and having an energy harvesting element configured to harvest energy derived from the AM signals.
  • RFID radio-frequency identification
  • the RFID tag further comprises an integrated circuit configured to utilize the energy harvested within the energy harvesting element to transmit an inbound RF signal.
  • a method of harvesting energy in a radio-frequency identification (RFID) tag comprising: receiving Acousto-Magnetic (AM) signals by the RFID tag; and harvesting energy derived from the AM signals in an energy harvesting element of the RFID tag.
  • RFID radio-frequency identification
  • AM exciter an energy harvesting zone within which the AM exciter is enabled to transmit the AM signals and the RFID tag is enabled to receive the AM signals.
  • RFID reader a reading zone within which the RFID reader is configured to transmit the outbound RF signal and receive the inbound RF signal.
  • RFID tag based on the inbound RF signal and generating an alarm.
  • example is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “example” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “at least one of A, B, and C,” and “A, B, C, or any combination thereof’ include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C,” “at least one of A, B, and C,” and “A, B, C, or any combination thereof’ may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.
  • Nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

La présente invention concerne un système destiné à collecter de l'énergie dans une étiquette d'identification par radiofréquences (RFID). Le système comporte l'étiquette RFID, un excitateur AM (acousto-magnétique) et un lecteur RFID. L'étiquette RFID comporte un circuit intégré, une antenne et un élément de collecte d'énergie. L'excitateur AM est activé pour émettre des signaux AM, l'antenne de l'étiquette RFID recevant les signaux AM qui permettent à l'antenne de collecter de l'énergie à l'intérieur de l'élément de collecte d'énergie. Le lecteur RFID est activé pour émettre des signaux RF sortants et recevoir des signaux RF entrants. Le circuit intégré est activé pour générer et émettre un signal RF entrant en réponse au signal RF sortant reçu, émis par le lecteur RFID. L'énergie collectée dans le condensateur est utilisée pour générer le signal RF de réponse. Les signaux AM sont des signaux RF pulsés, dont la quantité de pulsations par seconde est spécifiée et peut faire l'objet d'une variation.
PCT/US2022/070625 2021-02-12 2022-02-11 Système et procédé de collecte d'énergie dans des étiquettes WO2022174251A1 (fr)

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US202163148961P 2021-02-12 2021-02-12
US63/148,961 2021-02-12

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100148965A1 (en) * 2008-12-16 2010-06-17 Sensormatic Electronics Corporation Method and system for item level uhf rfid tag with low frequency power assist
US20200134998A1 (en) * 2018-10-25 2020-04-30 Sensormatic Electronics, LLC Unified security device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100148965A1 (en) * 2008-12-16 2010-06-17 Sensormatic Electronics Corporation Method and system for item level uhf rfid tag with low frequency power assist
US20200134998A1 (en) * 2018-10-25 2020-04-30 Sensormatic Electronics, LLC Unified security device

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