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公开(公告)号：US12099028B2
公开(公告)日：2024-09-24
申请号：US16945328
申请日：2020-07-31
申请人： RFMicron, Inc.
发明人： Brian David Young
IPC分类号： G01N27/04 , A61F13/42 , G01N27/22 , G01N35/00 , G06K19/07 , G08B21/20 , G08C17/00 , H04Q9/00 , H04W88/02
CPC分类号： G01N27/048 , A61F13/42 , G01N27/045 , G06K19/0717 , G08B21/20 , G08C17/00 , H04Q9/00 , A61F2013/424 , G01N27/225 , G01N2035/00881 , H04Q2209/40 , H04Q2209/80 , H04W88/02
摘要： A wireless sensor includes a radio frequency (RF) front end and a sensing integrated circuit (IC). The RF front end includes an antenna that is operable to transceive RF signals and a tuning circuit. The sensing IC includes a power supply. The sensing IC is operable to detect an impedance change of the power supply. The sensing IC is further operable to convert the impedance change into a digital value. The sensing IC is further operable to output, via the antenna, the digital value.
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公开(公告)号：US20230117486A1
公开(公告)日：2023-04-20
申请号：US17931336
申请日：2022-09-12
申请人： RFMicron, Inc.
摘要： A method includes determining, by a processing module of a data logging device, whether an event has occurred that potentially compromises reliability of the data logging device. The method further includes, when the event has occurred, determining, by the processing module, whether the reliability of the data logging device has been compromised. The method further includes, when the reliability of the data logging device has been compromised, generating, by the processing module, a compromised indication signal. The method further includes, when the reliability of the data logging device has not been compromised, generating, by the processing module, a data integrity indication signal.
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公开(公告)号：US20210352497A1
公开(公告)日：2021-11-11
申请号：US17364555
申请日：2021-06-30
申请人： RFMicron, Inc.
发明人： Shahriar Rokhsaz
摘要： A radio frequency (RF) circuit includes a tank circuit having a selectively variable impedance. The RF circuit further includes a tuning circuit adapted to dynamically vary the impedance of the tank circuit, and to develop a first quantized value representative of a change to impedance of the tank circuit. The RF circuit further includes a detector circuit adapted to develop a second quantized value representative of a field strength of a received RF signal.
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公开(公告)号：US10998886B2
公开(公告)日：2021-05-04
申请号：US15929299
申请日：2020-04-23
申请人： RFMicron, Inc.
发明人： Shahriar Rokhsaz
摘要： A radio frequency identification (RFID) tag includes an antenna operable to receive a radio frequency (RF) signal having a carrier frequency. The RFID tag further includes a tank circuit coupled to the antenna. The RFID tag further includes a tuning circuit operable to determine a received power level of the RF signal at the carrier frequency, determine whether the received power level is lower than a power level threshold. When the received power level is lower than the power level threshold: tuning circuit increases the input impedance of the RFID tag, determines a most recent power level of the received RF signal, and compares the most recent power level with the received power level. When the most recent power level is greater than the received power level, the tuning circuit incrementally increases the input impedance until the received power level is substantially equal to the power level threshold.
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公开(公告)号：US20210073490A1
公开(公告)日：2021-03-11
申请号：US17085895
申请日：2020-10-30
申请人： RFMicron, Inc.
摘要： A method includes sending, by a reader, a radio frequency (RF) signal to a wireless sensor that includes an antenna having a tail section and a head section. The tail section is for placement in an RF limited area for sensing moisture in a first location of a vehicle under test and wherein the head section is for placement in a non-RF limited area. The method further includes receiving, by the reader, an RF response to the RF signal from the wireless sensor. The first RF response includes an indication of adjustment of one or more RF characteristics of the wireless sensor, which corresponds to a variance of the one or more RF characteristics from a desired value, which, in turn, corresponds to a level of moisture at the first location. The method further includes outputting, by the reader, a message regarding the level of moisture at the first location.
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公开(公告)号：US10911160B2
公开(公告)日：2021-02-02
申请号：US16505436
申请日：2019-07-08
申请人： RFMicron, Inc.
摘要： A wireless sensor includes a radio frequency (RF) front end, a sensing element, and a processing module. The RF front end receives a request for sensed data from a sensing computing device and sends a coded digital value to the sensing computing device via the RF signal. The sensing element senses an environmental condition of an item. The processing module determines an effect on an operational parameter of an RF front end of the wireless sensor as a result of the sensing element sensing the environmental condition and while receiving the RF signal. The processing module also adjusts tuning of the RF front end to mitigate the effect on the operational parameter and equates an amount of adjusting of the tuning of the RF front end to a coded digital value.
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公开(公告)号：US20200382969A1
公开(公告)日：2020-12-03
申请号：US16846951
申请日：2020-04-13
申请人： RFMicron, Inc.
发明人： Shahriar Rokhsaz
摘要： A radio frequency identification (RFID) tag includes an antenna structure operable to receive a radio frequency (RF) signal, an RF signal circuit operable to, when enabled, produce the RF signal, a sensing element operably coupled to the antenna structure, a memory, and a processing module. When in a calibration mode, the processing module adjusts the input impedance until a measured power level is substantially equal to the desired input power level, and generates a first digital value based on the amount of the adjustment a power difference between a measured first input power level and a desired power level, and stores the first digital value in the memory, where the first digital value is representative of a known condition. In a sense mode, the processing module adjusts the input impedance until a second measured power level is substantially equal to the desired input power level, and generates a second digital value based on the amount of the adjustment a power difference between a measured first input power level and a desired power level, and the desired power level, and stores the second digital value in the memory, where the second digital value is representative of an unknown condition.
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公开(公告)号：US10824831B2
公开(公告)日：2020-11-03
申请号：US16773595
申请日：2020-01-27
申请人： RFMicron, Inc.
摘要： A method includes sending, by a reader, a radio frequency (RF) signal to a wireless sensor that includes an antenna having a tail section and a head section. The tail section is for placement in an RF limited area for sensing moisture in a first location of a vehicle under test and wherein the head section is for placement in a non-RF limited area. The method further includes receiving, by the reader, an RF response to the RF signal from the wireless sensor. The first RF response includes an indication of adjustment of one or more RF characteristics of the wireless sensor, which corresponds to a variance of the one or more RF characteristics from a desired value, which, in turn, corresponds to a level of moisture at the first location. The method further includes outputting, by the reader, a message regarding the level of moisture at the first location.
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公开(公告)号：US10796111B2
公开(公告)日：2020-10-06
申请号：US16133327
申请日：2018-09-17
申请人： RFMicron, Inc.
发明人： Shahriar Rokhsaz
摘要： A method begins by a radio frequency identification (RFID) reader transmitting a first and second radio frequency (RF) signal of a plurality of RF signals, which each include a unique carrier frequency and an instruction to an RFID tag to respond with a received power level indication. The method continues by the RFID reader receiving, in response to the first and second signals sent at a first and second carrier frequency, a first and second response from the RFID tag that includes a first and second received power level indication. The method continues by the RFID reader determining an estimated resonant frequency of the RFID tag based on the first and second received power level indications and the first and second carrier frequencies. The method continues by the RFID reader determining an environmental condition based on the estimated resonant frequency.
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10.发明授权公开(公告)号：US10734727B2
公开(公告)日：2020-08-04
申请号：US16119365
申请日：2018-08-31
申请人： RFMicron, Inc.
摘要： A radio frequency identification (RFID) tag includes a power harvesting circuit, an RF front-end, and a processing module. The power harvesting circuit generates power for the RFID tag from a continuous wave of an inbound radio frequency (RF) signal. The RF front-end receives the inbound RF signal and transmits an outbound RF signal. The RF front-end includes a tuning circuit that is tuned based on a capacitance setting. The tuning of the tuning circuit effects a characteristic of the RF front-end. The processing module generate the capacitance setting to adjust the characteristic of the RF front-end to a desired characteristic.
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