Systems and methods for operating a tag system. The methods comprising: emitting a wireless signal from an antenna of the tag with a first signal characteristic when the tag is proximate to an active antenna modulation marker; changing an impedance of a sensor from a first impedance value to a second impedance value when the active antenna modulation marker is exposed to a stimulus; and emitting a wireless signal from the antenna of the tag with a second signal characteristic when the tag is proximate to the active antenna modulation marker and the sensor has the second impedance value.

A system for detecting placement or misplacement of an object includes a wireless tag; a first electronic device (“FED”) associated with the tag to automatically detect signals from the tag, determine a position of the FED, transmit the position and status to an external electronic device or network (“EED”) in response to the status indicating that the tag and the FED are within a predetermined range, and transmit the position and status to the EED in response to the status indicating that the tag and the FED are outside of the predetermined range; and a second electronic device (“SED”) that is unassociated with the tag to automatically detect signals from the tag, determine a position of the SED, determine an identifier for the tag using the signals, and transmit the position of the SED and the identifier to the EED.

In some implementations, a wireless sensing system may receive sensor data associated with an asset. The sensor data may be associated with a tampering event and the tampering event may include an action performed on the asset. The wireless sensing system may further determine whether the tampering event is performed by an authorized user of the wireless sensing system. The wireless sensing system may further determine whether the tampering event is performed within an authorized location of the wireless sensing system. The wireless sensing system may transmit a notification to a user of the wireless sensing system. The notification may alert the user of the wireless sensing system that the tampering event has occurred.

A device for measuring a physical quantity, including at least a transceiver unit for electromagnetic waves, an antenna-sensor including a sensor integrated into a target antenna having at least one excitation port, the antenna-sensor having a variable impedance with electromagnetic transduction, the measuring device being configured, per predetermined frequency band and independently of the angular difference between the transmission and reception of waves, for measuring the electromagnetic response of the antenna-sensor at least from an ellipticity rate of an electromagnetic field backscattered by the antenna-sensor, the ellipticity rate characterizing the polarization of the electromagnetic field configured to be measured by the transceiver unit, the electromagnetic response being representative, by electromagnetic transduction, of the at least one physical quantity to be measured.

Embodiments herein describe a beacon that is used to verify a location of a user and provide access to a secure location (e.g., a locked building). The beacon includes a radio frequency reader which communicates with a tag (e.g., an NFC or RFID tag) disposed on a same surface as the beacon. For example, the beacon may cover the tag on the surface (e.g., a wall next to a locked door or access point into the secure location). The reader in the beacon can periodically perform a read cycle to identify the presence of the tag to ensure the beacon has not been removed. If during one or more cycles the reader does not detect the tag, the beacon can deactivate the beacon and no longer transmit the location verification code.

According to one or more embodiments, the tag reader includes a communication controller, a temperature measuring sensor, and a processor. The communication controller controls an output signal to be output from an antenna of the tag reader. The temperature measuring sensor measures an internal temperature of the tag reader. The processor sets the output value of an output signal based on the measured temperature and causes the communication control circuit to output the output signal from the antenna at the set output value.

A system for sensing a physical property of a medium inside a conduit includes a radio frequency identification (RFID) reader arranged to transmit electromagnetic signals in at least one radio frequency. An RFID tag receives the least one radio frequency and exchanges the received radio frequency to electrical energy powering the RFID tag. An included sensor electrically connected to the RFID tag receives the electrical energy from the RFID tag and powers the sensor to obtain measurement data of at least one physical property of the medium and transmit the measurement data to the RFID tag. The RFID tag transmits the measurement data to the RFID reader using the at least one radio frequency.

Example embodiments relate to radio-frequency identification (RFID) tags for liquid monitoring. An example RFID tag includes an antenna configured to communicate with an RFID reader. The antenna includes a radiating plane. The antenna also includes a ground plane. The RFID tag is attachable to a container. A reactance associated with the antenna is modifiable based on a temperature and a volume of a liquid within the container and adjacent to the ground plane. The RFID tag also includes an integrated circuit that includes a memory. The integrated circuit is configured to modulate the antenna in response to an RFID signal from the RFID reader based on the reactance associated with the antenna.

A method includes obtaining, by a processing module of a data logging device, a log command. The method further includes determining, by the processing module, whether to enter a finished mode for the data logging device based on a data logging condition. When not in the finished mode and in response to the log command, the method further includes obtaining, by the processing module, a measure of an environmental condition. The method further includes determining, by the processing module, whether the measure of the environmental condition is within an expected range. When the measure of the environmental condition is not within the expected range, the method further includes generating, by the processing module, an environmental violation signal when triggered.

An environmental exposure indicator includes a substrate and an environmental exposure indicator (“EEI”) material provided on the substrate that is configured to change an optical property between a creation state and an end state. The environmental exposure indicator material has a deployment state, between the creation state and the end state, at a deployment time. The environmental exposure indicator also includes calibration data based on the deployment state.