A radio frequency identification (“RFID”) antenna structure such as may be found on a tag, label or inlay for use with consumer products that has a conductive surface. The RFID structure of the present invention can be attached to the conductive surface without significantly modifying the performance of the RFID device. The RFID device has first and second portions, with the first portion having a first antenna pattern and the second portion including an elongate section for attachment to the consumer item.

A microelectronic wireless transmission device including: a substrate able to be traversed by radio waves intended to be emitted by the device, an antenna, an electrical power supply, an integrated circuit, electrically connected to the antenna and to the electrical power supply, and able to transmit to the antenna electrical signals intended to be emitted by the antenna in the form of the said radio waves, a cap rigidly connected to the substrate and forming, with the substrate, at least one cavity in which the antenna and the integrated circuit are positioned, where the cap comprises an electrically conductive material connected electrically to an electrical potential of the electrical power supply and/or of the integrated circuit, and able to form a reflector with regard to the radio waves intended to be emitted by the antenna.

An RFID tag is provided that includes an insulator film, an antenna with an antenna conductor pattern disposed on the insulator film, and an RFIC module mounted on the insulator film. The RFIC module includes an RFIC and an impedance matching circuit. The impedance matching circuit includes a first coil and a second coil. Main planes of magnetic flux loops generated in the vicinities of the first coil and the second coil by the antenna are not parallel to main planes of magnetic flux loops generated in the first coil and the second coil.

Brackets for amplifying antenna gain associated with mountable radio frequency identification (RFID) tags are disclosed. An example apparatus includes a bracket and an RFID tag. The bracket has a base, a first meandering amplification arm connected to and extending away from the base in a first direction, and a second meandering amplification arm connected to and extending away from the base in a second direction opposite the first direction. The RFID tag is mounted to the base of the bracket. The first meandering amplification arm and the second meandering amplification arm are respectively structured to at least one of: amplify an antenna gain associated with the RFID tag; or increase a communication range associated with the RFID tag.

An RFID device that can be connected to a piece of material, in particular, a piece of fabric (22), in an efficient manner and that is small and flexible is provided. A wire antenna (16) is coupled to an integrated circuit provided on a substrate (12) of the RFID device (10). The wire antenna (16) is attached to the substrate (12) by being laced with the substrate (12) via a pair of through holes. In this state, the wire antenna (16) is fixedly connected to the piece of material by heating a coating of the wire antenna (16), which coating includes a thermoset adhesive material. In this manner, the substrate (12) is connected to the piece of material via the wire antenna (16).

RFID devices are provided with an antenna coupled to an RFID chip by a direct or indirect connection. A data-carrying pattern that is visible at one or more wavelengths is incorporated into and/or onto the antenna. The pattern may comprise a plurality of apertures defined in the antenna or a material applied onto the antenna and having a property or properties different from a property or properties of the material used to form the antenna at one or more wavelengths. The pattern may carry data that is optically readable at one wavelength and quasi-optically readable at another wavelength. The pattern may include at least one sensing material configured to cause the pattern to present different data depending on whether a condition is existent or not. The antenna may include a plurality of layers, each with patterns or portions of a pattern or patterns that are visible at different wavelengths.

A fastener accessory includes a fastener body and a sacrificial radio frequency (RF) tag. A dielectric substrate of the tag is affixed to a contact surface of the fastener body. An RF antenna trace is connected to or printed on the substrate. The antenna trace transmits an RF response signal when energized by an external RF tracking circuit. The substrate is plastically deformed by an installation force to prevent transmission of the response signal. A method for locating the fastener body within a search area includes exciting a receiver trace of the tag using an interrogation signal, frequency-modulating an interrogation frequency using an RF modulating circuit, transmitting a response signal at a response frequency via a transmitting antenna trace of the tag, and detecting the response signal using an RF tracking circuit to locate the fastener body within the search area.

An RFID tag is provided that includes an RFIC chip having a first connection terminal and a second connection terminal, a first electrode electrically connected to the first connection terminal of the RFIC chip, a capacitance element connected in series to the first electrode and the RFIC chip, and short-circuit parts connecting the first electrode and a ground at an intermediate position of an electrical length of the first electrode. Moreover, the electrical length of the first electrode is a half of a wavelength of a communication frequency of the RFIC chip, the first connection terminal of the RFIC chip is connected to the first electrode at a position within one third of the electrical length from an end portion of the first electrode, and the second connection terminal of the RFIC chip is connected to the ground.

A Radio Frequency Identification (RFID) tag is disclosed. The RFID tag includes an antenna to receive a high frequency signal, a capacitor bank coupled with the antenna, a charge pump coupled with the antenna configured to convert the high frequency signal to a direct current (DC) signal, an envelope detector to measure peak voltage of the high frequency signal and a detector to compare an output of the charge pump and an output of the envelope detector. The RFID tag also includes an impedance tuning circuit coupled with the charge pump and the envelope detector configured change a capacitance of the capacitor bank based on an output of the detector and the envelope detector.

An RFID tag includes a circuit board, an RFID IC, a functional module, a case and a lid. The circuit board has a main part and an extended part. The extended part extends along an edge of the main part and includes an antenna conductor. The RFID IC is mounted on the circuit board. The functional module is disposed so as to overlap the circuit board. The case accommodates the circuit board and the functional module. The lid closes an opening of the case. The main part of the circuit board is held at a position away from an inner bottom surface of the case with the functional module as an obstacle in a direction toward the lid.