A wearable RFID device is provided for use in an event-based interrogation zone. The zone contains terminals with RFID readers. The device has an element worn by a user and an attached or embedded RFID tag. The tag has stored data representing a UniqueID of the tag, and a stored funds balance. The tag is programmed to activate an otherwise inactive one of said terminals upon presentation of the tag to the RFID reader of said terminal in a first tap, and communicate its UniqueID to the terminal for validation. Upon validation and following a second tap of the tag at the RFID reader, the tag's stored funds balance can be changed by the amount of a transaction run through said terminal. A temporary installation of a system of RFID-based terminals and user-worn RFID devices is also provided for use within an event interrogation zone.

One example discloses a first near-field device, including: a controller configured to establish a near-field communications link with a second near-field device; wherein the controller is configured to monitor a characteristic of the near-field communications link; wherein the controller is configured to select a first modulation encoding for transmitting a near-field signal if the characteristic is greater than a first characteristic threshold; and wherein the controller is configured to select a second modulation encoding for transmitting the near-field signal if the characteristic is less than the first characteristic threshold but greater than a second characteristic threshold.

An attachable booster antenna attachable to a coil antenna, includes a body; and an antenna including a multiple resonant antennas arrayed on the body, with each resonant antenna including an insulator layer having first and second surfaces; and first and second loop antennas disposed on the first and second surfaces, respectively, so as to confront each other via the insulator layer. Moreover, the first and second loop antennas each having an opening that discontinue a part of a loop and are arranged such that a closed loop is defined by at least a part of the first loop antenna and at least a part of the second loop antenna in a transparent plane viewed from a normal direction of the insulator layer. Furthermore, in the plan view of the insulator layer, the opening of the first and second loop antennas and the opening of the coil antenna overlap each other.

Devices, methods and systems related to wearable patch having blood alcohol content detector. In some embodiments, a wearable patch can include a patch structure having one or more layers and configured to allow the patch to be worn by a user, and an analyzer component implemented on or at least partially within the patch structure and configured to measure alcohol content level in the user. The wearable patch can further include an interface component implemented on or at least partially within the patch structure and in communication with the analyzer component, with the interface component being configured to provide a notification based on the measured alcohol content. In some embodiments, such a wearable patch can be a part of a system such as a monitoring system or a compliance system.

A processing system of a carrier transport vehicle including at least one processor may obtain a notification of a luggage item to be placed in a stowage bin of the carrier transport vehicle, the notification including an identifier of the luggage item, detect, via the identifier of the luggage item, that the luggage item is proximate to the stowage bin, where the identifier of the luggage item is obtained via a wireless signal from the luggage item, and present at least one visual indicator associated with the stowage bin, in response to the detecting that the luggage item is proximate to the stowage bin.

A method for limiting voltage at an input of an integrated circuit of a transponder contactlessly communicating with a reader includes, during the contactless communication: receiving a carrier signal at an antenna of the transponder; and controlling gate voltages of two transistors of a rectifier circuit of the transponder so as to modify an input impedance of the integrated circuit, wherein the two transistors are cross-coupled between terminals of the antenna and a reference voltage.

A device includes a first circuit that includes a near-field emission circuit, a second circuit, and a hardware connection linking the first circuit to the second circuit. The hardware connection is dedicated to a priority management between the first circuit and the second circuit. In addition, priority management information can be communicated between a near-field emission circuit and a second circuit. The communicating occurs between a dedicated hardware connection connecting the near-field emission circuit to the second circuit.

A method is described for determining at least one location for backscattering, by at least one transmitter device and to at least one receiver device, of an ambient radio signal, the transmitter device being associated with a zone, a backscattering and a non-backscattering operating state, and a working frequency band. Further, the method is implemented by the transmitter device when it is in the non-backscattering state and comprises travel of the transmitter device in at least one part of the zone, during which the transmitter device acquires, in the working band and in at least one location of the part of the zone, a measurement of electromagnetic power received by the transmitter device, and compares the measurement with a determined threshold, the location associated with the measurement being determined as a location for backscattering if the measurement is greater than the threshold.

Smart livestock management method and system based on Internet of things. The smart livestock management system may include a gate. The gate may include a frame forming a moving path of an animal, an external device disposed in the frame and configured to radiate electromagnetic waves toward the moving path and to receive identification information and bio information of the animal from an implant device inserted into the body of the animal passing through the moving path, and a camera configured to obtain image data of the animal passing through the moving path.

A communication apparatus includes an antenna, an actuator assembly, a transducer, and a controller. The actuator assembly is configured to move the antenna in two dimensions relative to a space configured to contain a wireless tag. The transducer is configured to provide phase data indicating a phase of a signal transmitted from the wireless tag in at least (a) a first detection condition in which the antenna has a first position relative to the space and (b) a second detection condition in which the antenna has a second position relative to the space. The controller is configured to determine whether the wireless tag is located inside of the space based on the phase data.