RFID devices are provided for use in combination with a food item or other temperature-sensitive item. The RFID devices include an RFID chip and an antenna electrically coupled to the RFID chip, along with a temperature-sensitive member. The temperature-sensitive member is configured to be in a first condition below a selected temperature and a second condition above the selected temperature to signify that the RFID device and associated food item or other temperature-sensitive item have been exposed to a temperature above the selected temperature. The temperature-sensitive member may be incorporated into the antenna to render the antenna at least partially inoperative above the selected temperature. The temperature-sensitive member may instead be configured to exhibit different colors below and above the selected temperature, or a single RFID device may include both types of temperature-sensitive members. Such RFID devices may also incorporate tamper-resistant features and/or accommodate human- and/or machine-readable printed symbols.

Provided herein are systems and methods comprising two or more localization agents that are linked together by a linker. For example, provided herein are systems and methods for the placement of two or more linked localization devices within biological systems and the detection of such localization devices for targeted surgeries or other medical procedures. For example, provided herein are systems comprising one or more miniature detectable devices that are linked together, that are placed into a target location and activated by remote introduction of a magnetic field.

A controller of a transaction card may cause the transaction card to be in a first state. The transaction card may include a battery and at least one other component. In the first state, the battery does not provide power to the at least one other component of the transaction card. The transaction card may receive a signal from a near-field communication (NFC) device and may cause the transaction card to be in a second state based on receiving the signal. In the second state, the battery provides power to the at least one other component of the transaction card. The transaction card may perform a transaction based on the transaction card being in the second state.

A smart card inlay comprising an inductive antenna, and a capacitive network. The inductive antenna is configured to (i) communicate wirelessly with a card terminal, and (ii) power the card circuitry via inductive coupling to the card terminal. The capacitive network is connected in parallel with the inductive antenna. The capacitive network comprises a first capacitor in series with a second capacitor. The second capacitor is connectable in parallel with card circuitry. The first capacitor has a capacitance C.sub.1 and the second capacitor has a capacitance C.sub.2, the ratio C.sub.2/C.sub.1 being so as to match the impedance of the card terminal as reduced by the capacitive network to the impedance of the card circuitry.

A controller of a transaction card may cause the transaction card to be in a first state. The transaction card may include a battery and at least one other component. In the first state, the battery does not provide power to the at least one other component of the transaction card. The transaction card may receive a signal from a near-field communication (NFC) device and may cause the transaction card to be in a second state based on receiving the signal. In the second state, the battery provides power to the at least one other component of the transaction card. The transaction card may perform a transaction based on the transaction card being in the second state.

A transaction device includes a metal layer with one or more discontinuities in the metal layer. Each discontinuity comprises a gap in the metal layer extending from the front surface to the back surface, including at least one discontinuity that defines a path from the device periphery to the opening. A transponder chip module is disposed in the opening. A booster antenna is in communication with the transponder chip module. The device may include at least one fiber-reinforced epoxy laminate material layer. The transponder chip module and the booster antenna may comprise components in a payment circuit, with the metal layer electrically isolated from the payment circuit. The booster antenna may be formed on or embedded in the fiber-reinforced epoxy laminate material layer. Processes for manufacturing transaction devices including a metal layer with one or more fiber-reinforced epoxy laminate material layers are also disclosed.

A RFID (Radio Frequency Identification) system is provided, comprising at least one tag assembly having at least one tag inductance element that is operatively coupled to an integrated circuit (IC). The RFID system further comprises at least one reader assembly having at least one reader inductance element that is configured to operatively and communicatively couple with the tag assembly, and a resonance assembly having at least one first resonance element that is inductively coupleable to the at least one tag inductance element and/or at least one second resonance element that is inductively coupleable to the at least one reader inductance element, and which is adapted to provide coupled magnetic resonance signal transmission between the reader assembly and the tag assembly.

An antenna device is provided as a near-field communication antenna device that is configured by arranging a plurality of loop antennas. Each loop antenna includes a plurality of parallel circuits each having a capacitor and a resistance element; and a plurality of looped conductors in a shape of a loop that is divided. The divided looped conductors are connected to each other via the parallel circuits, and the plurality of looped conductors and the plurality of parallel circuits form a loop.

Disclosed is a destructible RFID Tag that may include a far field antenna, a near field loop having an RFID chip, and an attachment adhesive configured to bond the destructible RFID Tag to an object. In at least one nonlimiting example embodiment the far field antenna and the near field loop are inductively coupled in a manner that allows the near field loop to send a long distance signal via the far field loop, and wherein the destructible RFID Tag destructs when the destructible RFID Tag is removed from an object after the attachment adhesive is bonded to the object.

A process for manufacturing a transaction card includes forming an opening in a card body of the transaction card; inserting an electronic component into the opening; and molding a molding material about the electronic component. A transaction card includes a molded electronic component.