Abstract: An apparatus system, and techniques for detecting temperature change are disclosed. The system includes a temperature sensitive antenna that can be included in an RFID tag device. The antenna is associated with a temperature sensitive material that, upon being exposed to a particular temperature level over a time interval, causes at least one of a change in the resonance frequency of the antenna and change in antenna signal strength (e.g., antenna gain). An RFID reader is also provided that sends commands to the tag device and determines the existence of a temperature change based on a comparison of signal strengths received on different frequencies from the antenna.

Abstract: Methods, systems, and apparatuses for antenna designs for radio frequency identification (RFID) tags are described.

Abstract: A method for pipelined processing of access commands to a population of radio frequency identification (RFID) tags is provided. The method includes transmitting a first queued access command to a first tag in the population of RFID tags, transmitting a second queued access command to a second tag in the population of RFID tags, and transmitting a status request command to the first tag. The queued access command causes the first tag to perform an operation and upon completion of the operation, to suspend transaction processing. The second queued access command is transmitted while the first tag is performing the command operation. The status request command causes the first tag to resume normal processing.

Abstract: Methods, systems, and apparatuses for antenna designs for radio frequency identification (RFID) tags are described.

Abstract: Methods, systems, and apparatuses for antenna designs for radio frequency identification (RFID) tags are described.

Abstract: Methods, systems, and apparatuses for detecting a reader signal strength in a radio frequency identification (RFID) tag is described. A tag is configured to monitor an attribute of a reader transmitted signal, such as the signal strength. The tag generates an indication of the signal attribute, and transmits the indication of the signal attribute to the reader.

Abstract: An apparatus system, and techniques for detecting temperature change are disclosed. The system includes a temperature sensitive antenna that can be included in an RFID tag device. The antenna is associated with a temperature sensitive material that, upon being exposed to a particular temperature level over a time interval, causes at least one of a change in the resonance frequency of the antenna and change in antenna signal strength (e.g., antenna gain). An RFID reader is also provided that sends commands to the tag device and determines the existence of a temperature change based on a comparison of signal strengths received on different frequencies from the antenna.

Abstract: Methods, systems, and apparatuses for monitoring and refreshing data stored in radio frequency identification (RFID) tags are described. A voltage margin for data stored in memory of a tag is checked. If the voltage margin has decreased to an undesirable level, the data stored in the tag is refreshed.

Abstract: Methods, systems, and apparatuses for antenna designs for radio frequency identification (RFID) tags are described.

Abstract: Methods, systems, and apparatuses for antenna designs for radio frequency identification (RFID) tags are described.

Abstract: A method for pipelined processing of access commands to a population of radio frequency identification (RFID) tags is provided. The method includes transmitting a first queued access command to a first tag in the population of RFID tags, transmitting a second queued access command to a second tag in the population of RFID tags, and transmitting a status request command to the first tag. The queued access command causes the first tag to perform an operation and upon completion of the operation, to suspend transaction processing. The second queued access command is transmitted while the first tag is performing the command operation. The status request command causes the first tag to resume normal processing.

Abstract: Various antenna arrangements are disclosed for RFID tags. Embodiments of single dipole, dual dipole and patch antenna arrangements are described. Dipole antenna arrangements include metalizations used for tuning the antenna to resonance and for impedance matching to an IC with which they operate. Patch antenna arrangements have cut out portions used for tuning the antenna to resonance and for impedance matching to an IC with which they operate.

Abstract: Methods, systems, and apparatuses for updating pointers in memory are described. A device can include pointer logic and a memory that stores a memory pointer. The pointer logic can increment or decrement the memory pointer according to Gray code. The device can increment or decrement the memory pointer in response to a pointer change command and can be configured to first verify a password associated with the command. The device can send an acknowledgement that the command has been received and/or executed. Multiple increments or decrements of the memory pointer can occur in response to a pointer change command configured as a single multiple-increment-or-decrement command or as multiple single-increment-or-decrement change commands. The device can determine an updated value for each of a first memory pointer portion and a second memory pointer portion of the memory pointer.

Abstract: Methods, systems, and apparatuses for preventing unauthorized reading of data stored in tags are described. A non-identifying bit pattern, an identifying bit pattern, and a first passcode are stored in the tag. A read lock command is received by the tag. The tag determines whether a second passcode associated with the read lock command matches the first passcode. Read access to the identifying bit pattern is disabled if it is determined that the second passcode matches the first passcode.

Abstract: Methods, systems, and apparatuses for detecting a reader signal strength in a radio frequency identification (RFID) tag is described. A tag is configured to monitor an attribute of a reader transmitted signal, such as the signal strength. The tag generates an indication of the signal attribute, and transmits the indication of the signal attribute to the reader.

Abstract: Methods, systems, and apparatuses for testing antenna(s) of a radio frequency identification (RFID) tag are described. A reader transmits a test command signal to a RFID tag having a plurality of antennas. Each antenna of the plurality of antennas is coupled to a respective antenna port. The tag processes the test command signal to determine which one or more of the plurality of antennas is to be tested. The tag couples an information signal to the antenna port(s) corresponding with the antenna(s) to be tested. For example, the tag may include enabling elements that selectively couple the information signal to respective antenna ports based on respective test control signals. The RFID tag generates the test control signals based on the test command signal. The reader awaits receipt of the information signal from the RFID tag.

Abstract: Methods, systems, and apparatuses for monitoring and refreshing data stored in radio frequency identification (RFID) tags are described. A voltage margin for data stored in memory of a tag is checked. If the voltage margin has decreased to an undesirable level, the data stored in the tag is refreshed.

Abstract: Methods, systems, and apparatuses for antenna designs for radio frequency identification (RFID) tags are described.

Abstract: Methods, systems, and apparatuses for a radio frequency identification (RFID) tag tester/programmer and marker are described. A surface is in contact with a web of RFID tags. The surface has a first portion and a second portion. The first portion of the surface is grounded to ground tags of the web that are in contact with the first portion. A radio frequency (RF) source transmits a RF signal to interact with a tag adjacent to the second portion of the surface. The RF signal may be a signal for testing the tag and/or a signal for programming the tag.

Abstract: Methods, systems, and apparatuses for a radio frequency identification (RFID) tag tester/programmer and marker are described. A surface is in contact with a web of RFID tags. The surface has a first portion and a second portion. The first portion of the surface is grounded to ground tags of the web that are in contact with the first portion. A radio frequency (RF) source transmits a RF signal to interact with a tag adjacent to the second portion of the surface. The RF signal may be a signal for testing the tag and/or a signal for programming the tag.