Patents by Inventor Shahriar Rokhsaz

Shahriar Rokhsaz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10410026
    Abstract: A label sensor that can be affixed to an item includes a first section and a second section. The first section includes a memory, an environmental sensor, a radio frequency (RF) front end, and a processing module. The processing module is operably coupled to the memory, the environmental sensor, and the RF front end. The second section includes an activation circuit that is operable, upon receiving an input, to activate one or more of the memory, the environmental sensor, the RF front end and the processing module. The activation causes the label sensor to be put in an operational mode of a plurality of operational modes.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: September 10, 2019
    Assignee: RFMicron, Inc.
    Inventors: Tanmay Zargar, Alan Wayne Hansford, Shahriar Rokhsaz
  • Patent number: 10389027
    Abstract: A method includes varying, by a tuning module of a passive radio RFID sensor, a reactive component impedance coupled to the tuning module and an antenna of the passive RFID sensor in order to change a system impedance. The method further includes producing an impedance value representative of the reactive component's impedance. The method further includes storing, by a memory module of the passive RFID sensor, the impedance value, identification information corresponding to the antenna, and a timestamp corresponding to the impedance value. The method further includes communicating, by a wireless communication module of the passive RFID sensor, the impedance value, the identification information, and the timestamp to an RFID reader. When the impedance value, the identification information, and the timestamp indicate an unfavorable environmental condition, the method further includes generating, by the RFID reader, an alarm signal.
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: August 20, 2019
    Assignee: RF Micron, Inc.
    Inventors: Shahriar Rokhsaz, Brian David Young, Ahmed Younis
  • Patent number: 10348419
    Abstract: A wireless sensor includes a substrate, an antenna, a sensing element, a transmission line, and a sensing integrated circuit (IC). The sensing element is positioned on one end of the substrate and the antenna is positioned on an opposite end of the substrate. The sensing IC is coupled to the sensing element and to the antenna via the transmission line. The sensing IC is operable to receive a sensed condition of the item from the sensing element. The sensing IC is further operable to determine an input impedance of the wireless sensor based on the sensed condition and convert it into a digital value that is representative of the condition of the item. The sensing IC is further operable to output, via the antenna, the digital value or a representation of the condition of the item.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: July 9, 2019
    Assignee: RFMicron, Inc.
    Inventors: Brian David Young, Shahriar Rokhsaz
  • Publication number: 20190188429
    Abstract: A label sensor that can be affixed to an item includes a first section and a second section. The first section includes a memory, an environmental sensor, a radio frequency (RF) front end, and a processing module. The processing module is operably coupled to the memory, the environmental sensor, and the RF front end. The second section includes an activation circuit that is operable, upon receiving an input, to activate one or more of the memory, the environmental sensor, the RF front end and the processing module. The activation causes the label sensor to be put in an operational mode of a plurality of operational modes.
    Type: Application
    Filed: June 18, 2018
    Publication date: June 20, 2019
    Applicant: RFMicron, Inc.
    Inventors: Tanmay Zargar, Alan Wayne Hansford, Shahriar Rokhsaz
  • Publication number: 20190190498
    Abstract: A method for execution by a RFID tag includes receiving, by an antenna of the RFID tag, an RF signal from an RFID reader, where the RF signal has a carrier frequency. The method further includes determining, by a tuning circuit of the RFID tag, a received power level of the RF signal at the carrier frequency and whether the received power level compares favorably to a power level threshold. When the received power level compares unfavorably to the power level threshold, the method further includes adjusting, by the tuning circuit, the input impedance of the RFID tag by adjusting a tank circuit of the RFID tag until the received power level compares favorably to the power level threshold, where the input impedance of the RFID tag is based on one or more of impedance of the antenna and impedance of the tank circuit.
    Type: Application
    Filed: January 29, 2019
    Publication date: June 20, 2019
    Applicant: RFMicron, Inc.
    Inventor: Shahriar Rokhsaz
  • Publication number: 20190180064
    Abstract: 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.
    Type: Application
    Filed: February 4, 2019
    Publication date: June 13, 2019
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Brian David Young
  • Publication number: 20190149135
    Abstract: A wireless sensor includes a radio frequency (RF) receiving circuit operable to receive an RF signal having a carrier frequency of a plurality of carrier frequencies. The RF receiving circuit further includes a variable impedance where impedance of the variable impedance is a factor in establishing a resonant frequency of the RF receiving circuit. The wireless sensor further includes a processing module that is operable to determine a first value for a first impedance of the variable impedance for a known temperature based on the resonant frequency and the carrier frequency, determine a second value a second impedance of the variable impedance for an unknown temperature based on the resonant frequency and the carrier frequency, and determine a difference between the first and second values that corresponds to a change between the known temperature and the unknown temperature.
    Type: Application
    Filed: December 20, 2018
    Publication date: May 16, 2019
    Applicant: RFMicron, Inc.
    Inventor: Shahriar Rokhsaz
  • Patent number: 10291077
    Abstract: A power harvesting circuit a p-channel circuit, an n-channel circuit, an AC capacitance circuit, and an output capacitance circuit. The p-channel circuit includes a first diode element and a first start-up current circuit operably coupled to increase start-up current of the first diode element. The n-channel circuit includes a second diode element and a second start-up current circuit operably coupled to increase start-up current of the second diode element. The AC coupling capacitance circuit is coupled to the p-channel circuit and the n-channel circuit. The output capacitance circuit is coupled to the p-channel circuit and the n-channel circuit.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: May 14, 2019
    Assignee: RFMicron, Inc.
    Inventors: Ahmed Younis, Shahriar Rokhsaz
  • Publication number: 20190097323
    Abstract: 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.
    Type: Application
    Filed: August 31, 2018
    Publication date: March 28, 2019
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Brian David Young, Marwan Hassoun
  • Publication number: 20190097598
    Abstract: A power detector for use in an RF receiver. The detector includes a power reference generator and a power quantizer. The power reference generator develops a power reference current, voltage, or signal as a function of a power transferred via a received RF signal. The power quantizer is responsive to the power reference current, voltage, or signal to develop a digital field power value indicative of the power reference current, voltage, or signal.
    Type: Application
    Filed: November 21, 2018
    Publication date: March 28, 2019
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Edwin De Angel
  • Patent number: 10243255
    Abstract: A method begins by a first radio frequency identification (RFID) sensor, that is associated with a first object element, receiving a first data request signal from an RFID reader and sending a first radio frequency (RF) signal that includes first data to the RFID reader in response to the first data request signal. The method continues with a second RFID sensor receiving a second data request signal from, and sending second data to, the RFID reader. The method continues with the RFID reader sending a representation of the first and second data to a data processing unit, which processes the representation of the first and second data to determine a first and second data point regarding first and second object elements. The method continues by the data processing unit processing the first and second data points to determine an environmental relationship between the first and second object elements.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: March 26, 2019
    Assignee: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Brian David Young, Ahmed Younis, John J. Paulos, Abhay Misra, Benjamin Cooke, Marwan Hassoun
  • Patent number: 10243479
    Abstract: A power harvesting circuit, a rectifier circuit and a capacitor. The rectifier circuit includes a diode circuit and a diode voltage reduction circuit. The diode circuit passes a current when a received RF signal has a first polarity and to substantially blocks the current when the received RF signal has a second polarity. The diode voltage reduction circuit is operably coupled to reduce a voltage drop of the diode circuit. The capacitor is operably coupled to convert the rectified signal into a DC supply voltage.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: March 26, 2019
    Assignee: RFMicron, Inc.
    Inventors: Brian David Young, Shahriar Rokhsaz, Ahmed Younis, Marwan Hassoun
  • Publication number: 20190075473
    Abstract: A radio frequency identification (RFID) tag includes an antenna structure, a tank circuit, and a processing module that includes a tuning circuit. The processing module requires a processing module power level to operate according to a protocol. The tuning circuit requires a tuning circuit power level to adjust input impedance. The processing module power level is greater than the tuning circuit level. The processing module measures a first power level from a received RF signal. When the first power level is greater than the tuning circuit power level but less than the processing module power level, the processing module adjusts the input impedance to increase efficiency of power measurement and measures a second power level from the received RF signal. When and the second power level is greater than the processing module power level, the processing module uses the second power level to operate according to the protocol.
    Type: Application
    Filed: November 7, 2018
    Publication date: March 7, 2019
    Applicant: RFMicron, Inc.
    Inventor: Shahriar Rokhsaz
  • Patent number: 10224903
    Abstract: A method includes receiving a series of radio frequency (RF) signals, where, from RF signal to RF signal of the series of RF signals, a carrier frequency is changed in accordance with a frequency hopping pattern. The method further includes, while receiving the series of RF signals, sensing an environmental condition by, for a frequency hop of at least some frequency hops of the frequency hopping pattern, adjusting a characteristic of a wireless sensor to maintain proximal alignment of a resonant frequency of the wireless sensor with the carrier frequency corresponding to a present frequency of the at least some frequency hops and generating a value to represent the adjustment of the characteristic, where a set of values is generated for the at least some frequency hops and where the set of values is used to determine a sensed value of the environmental condition.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: March 5, 2019
    Assignee: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Greg Pitner
  • Patent number: 10224902
    Abstract: A method and apparatus for manufacturing thin RFID tags adapted to be mounted proximate an interfering substance, such as metal or liquid. Each tag comprises: a web substrate having a predetermined thickness; an antenna attached to the substrate; and an RFID integrated circuit connected to the antenna, the RFID integrated circuit comprising a tank circuit adapted to be tuned in response to an RF signal after the tag has been mounted proximate the interfering substance. In one embodiment, the tag is manufactured using roll-to-roll manufacturing technology.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: March 5, 2019
    Assignee: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Stanley Drobac
  • Patent number: 10210358
    Abstract: A method for execution by a RFID tag includes receiving, from an RFID reader, an RF signal, where the RF signal has a carrier frequency of a plurality of carrier frequencies that span a broad frequency band. The method further includes adjusting input impedance of the RFID tag over a range of input impedances, where the input impedance of the RFID tag is based on one or more of impedance of the RFID tag's antenna and tank circuit. The method further includes monitoring power level of the received RF signal over the range of input impedances. The method further includes selecting the input impedance of the range of input impedances providing a substantially maximum power level of the received RF signal, where the substantially maximum power level corresponds to the carrier frequency being substantially equal to a resonant frequency of at least one of the antenna and the tank circuit.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: February 19, 2019
    Assignee: RFMicron, Inc.
    Inventor: Shahriar Rokhsaz
  • Patent number: 10198607
    Abstract: A method begins by detecting a variance of one or more RF characteristics of a wireless sensor from a desired value of the one or more RF characteristics, due to exposure to an environmental condition. The tuning circuit is operably coupled to an antenna that includes a tail section that is located in a radio frequency (RF) limited area, and a head section that is located in a non-RF limited area. The method continues by adjusting the tuning circuit in response to the detecting of the variance. The method continues by generating a message regarding the adjusting of the tuning circuit, wherein a level of the adjusting of the tuning circuit is representative of the variance of the one or more RF characteristics sensed by the tail section. The method continues by transmitting the message to one or more of an RF reader and a computing device.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: February 5, 2019
    Assignee: RFMicron, Inc.
    Inventor: Shahriar Rokhsaz
  • Publication number: 20190034672
    Abstract: 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.
    Type: Application
    Filed: September 17, 2018
    Publication date: January 31, 2019
    Applicant: RFMicron, Inc.
    Inventor: Shahriar Rokhsaz
  • Patent number: 10164611
    Abstract: A wireless sensor includes a radio frequency (RF) receiving circuit including a plurality of components, where impedances of the plurality of components establish a resonant frequency of the RF receiving circuit. The wireless sensor further includes a sensing element that when exposed to an environmental condition, affects the resonant frequency of the RF receiving circuit. The wireless sensor further includes a processing module that is operable to determine a first value for an adjustable element of a plurality of elements for a known environmental condition based on the resonant frequency and the carrier frequency, determine a second value for the adjustable element for an unknown environmental condition based on the resonant frequency and the carrier frequency, and determine a difference between the first and second values that corresponds to a change between the known environmental condition and the unknown environmental condition.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: December 25, 2018
    Assignee: RFMicron, Inc.
    Inventor: Shahriar Rokhsaz
  • Publication number: 20180365457
    Abstract: A radio frequency identification (RFID) tag includes an antenna, a power circuit, a tuning circuit, a receiver, and a backscatter transmitter. The power circuit is operably coupled to convert a radio frequency (RF) signal received via the antenna from an RFID reader into one or more power supply voltages. The tuning circuit is operably coupled to the antenna and to adjust an RF characteristic of the antenna and/or the tuning circuit based on a difference between a resonant frequency of the RFID tag and a carrier frequency of the RF signal. The receiver is operably coupled to receive a command signal from the RFID reader. The backscatter transmitter is operably coupled to transmit a response signal to the RFID reader via the antenna.
    Type: Application
    Filed: July 30, 2018
    Publication date: December 20, 2018
    Applicant: RFMicron, Inc.
    Inventors: Shahriar Rokhsaz, Brian David Young