The invention provides liquid compositions comprising conductive carbon particles and/or carbon nanoparticles, a thickening agent, and a solvent. The carbon nanoparticles are preferably a mixture of graphite nanoplatelets and carbon nanotubes and the thickening agent is preferably a cellulose derivative. The liquid compositions can be used as ink to print highly conductive films that adhere to paper substrates.

The invention concerns an RFID sensor device (1, 2, 3) for tires, designed to be embedded/integrated, at least partially, in/into, or applied to, a tire (4) and comprising a patch-type antenna that includes a multilayer structure comprising: a bottom ground plane (10, 20, 30); an intermediate dielectric substrate (11, 21, 31) arranged on the bottom ground plane (10, 20, 30); and one or more top conductive patches (12, 13, 22, 32) arranged on the intermediate dielectric substrate (11, 21, 31) and covering partially or completely said intermediate dielectric substrate (11, 21, 31), wherein said bottom ground plane (10, 20, 30) and said one or more top conductive patches (12, 13, 22, 32) are short-circuited or capacitively coupled. The RFID sensor device (1, 2, 3) further comprises: a rigid or flexible board (15, 25, 33) arranged on said one or more top conductive patches (12, 13, 22, 32) and/or the intermediate dielectric substrate (11, 21, 31); an RFID chip (16, 26, 34) installed on the rigid/flexible board (15, 25, 33) and connected/coupled to said one or more top conductive patches (12, 13, 22, 32); a temperature sensor integrated into, or connected to, said RFID chip (16, 26, 34); and a pressure sensor (17, 27, 35) installed on the rigid/flexible board (15, 25, 33) and connected to the RFID chip (16, 26, 34). The bottom ground plane (10, 20, 30) is formed: by conductive textile/fabric/thread/fiber/yarn elements/layers or by a metal weft/net/mesh; or at least partially by conductive and/or metal elements/layers of the tire (4). The intermediate dielectric substrate (11, 21, 31) is made at least partially of rubber, or is formed at least partially by dielectric and/or rubber elements/layers of the tire (4).

An RFID tag is provided that includes an RFIC module with a base substrate and an RFIC chip, and an antenna element. A principal surface of the base substrate is provided with a first chip connection terminal connected to a first input/output terminal of the RFIC chip, a second chip connection terminal connected to a second input/output terminal, a first module-side terminal connected by direct current or capacitively coupled to a first antenna-side terminal of the antenna element, a second module-side terminal connected by direct current or capacitively coupled to a second antenna-side terminal, a first wiring pattern connecting the first chip connection terminal and the first module-side terminal, a second wiring pattern connecting the second chip connection terminal and the second module-side terminal, and a third wiring pattern connecting the first module-side terminal and the second module-side terminal.

A wireless communication device for transmitting/receiving a high-frequency signal having a predetermined communication frequency. The wireless communication device includes an antenna pattern having an inductance component, an RFIC element connected electrically to the antenna pattern and a capacitive coupling portion capacitively coupling specific confronting regions facing each other of the antenna pattern at multiple points on the antenna pattern, to make up an LC parallel resonant circuit.

A vibration transducer for sensing vibrations includes a first flexible triboelectric member, a second flexible triboelectric member, a plurality of attachment points, a first electrode and a second electrode. The first flexible triboelectric member includes a first triboelectric layer and a material being on a first position on a triboelectric series. A conductive layer is deposited on the second side thereof. The second flexible triboelectric member includes a second triboelectric layer and a material being on a second position on the triboelectric series that is different from the first position on the triboelectric series. The second triboelectric member is adjacent to the first flexible triboelectric member. When the first triboelectric member comes into and out of contact with the second triboelectric member as a result of the vibrations, a triboelectric potential difference having a variable intensity corresponding to the vibrations can be sensed between the first and second triboelectric members.

A method of detecting products includes a magnetic field generating device configured to generate a magnetic field, and a split ring resonator assembly configured to be magnetically coupled to the magnetic field generating device and configured to focus the magnetic field produced by the magnetic field generating device.

An antenna apparatus having a substrate, an antenna on the substrate, and a power supply circuit element on the substrate and connected to the antenna. The antenna includes coil-shaped first and second coil antenna units respectively having coil axes that intersect with the substrate. The first coil antenna unit and the second coil antenna unit are arranged on the substrate such that a direction in which a current flows through one of the coil antenna units is clockwise and a direction in which the current flows through the other of the coil antenna units is counterclockwise. The power supply circuit element is positioned between the first coil antenna unit and the second coil antenna unit.

A circulator includes: a ferrite plate; a permanent magnet that applies a direct current (DC) magnetic field to the ferrite plate; a first coil, a second coil, and a third coil arranged on the ferrite plate while being insulated from one another, the first coil, the second coil, and the third coil having coil axes intersecting one another; a first port that is electrically continuous with the first coil; a second port that is electrically continuous with the second coil; and a third port that is electrically continuous with the third coil. An inductance of the first coil or the second coil is different from an inductance of the third coil, and an impedance of the first port or the second port is not 50Ω.

A wireless-power harvester integrated in a small device, comprising a stamped metal harvesting antenna. The stamped metal antenna is formed into a meandering shape. A first end of the meandering shape is a free end positioned within free space of a housing of a small device, and a second end of the meandering shape is coupled to a PCB that includes electrical components for operating and powering the small device. The PCB is configured to operate as a ground plane for the stamped metal antenna. An intermediate portion, disposed between the first end and the second end of the meandering shape, is coupled to power-conversion circuitry that is separate from the PCB. The power-conversion circuitry is configured to convert the one or more RF power waves harvested by the stamped metal harvesting antenna into usable energy for charging a battery of the small device or for powering the small device.

An apparatus comprises a structure including a cavity that, when excited with electromagnetic energy, produces an electric field having randomized distribution of field amplitude and polarity. The apparatus further comprises a sensor within the cavity. The sensor has a plurality of antennas for wirelessly harvesting operating power along different paths within the cavity.