Murata Manufacturing Co., Ltd.

Makoto Yasutake

Noboru Kato

Hiromi Murayama

Noriyuki Ueki

Tsuyoshi Suesada

Shinichiro Banba

Ikuhei Kimura

Kengo Matsumoto

Yoichi Saito

Kazuki Eshima

Kunihiro Komaki

Teppei Miura

Makoto Takeoka

Atsuyuki Yuasa

An RFID auxiliary antenna device is provided on an article that is adjacent to an RFID tag to be communicated or accommodates the RFID tag. The RFID auxiliary antenna device includes a conductive pattern that circles the article. A capacitance component generated between conductive patterns and an inductance component of the conductive pattern configure a resonant circuit. A resonant frequency of the resonant circuit is equal to or substantially equal to a communication frequency of the RFID tag, and the RFID auxiliary antenna device is magnetically coupled to each of the RFID tag and a reader/writer.

RFID auxiliary antenna device

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.

Antenna device and RFID tag communication device

A wireless IC tag-attached metal medical instrument includes a metal medical instrument including a metal portion. The metal medical instrument is configured such that electric, magnetic, or electromagnetic field coupling is established between a resonant circuit and the metal portion when a wireless IC tag is fixed to the metal portion that includes the resonant circuit having an inductor with a spiral or helix shape that turns around a central axis more than one turn. In this configuration, the metal portion either emits a transmission signal with a frequency equal to a resonant frequency of an electromagnetic wave supplied from the resonant circuit or receives a reception signal having a frequency equal to the resonant frequency, and supplies the reception signal to the resonant circuit.

Wireless IC tag-attached metal medical instrument

A medical instrument is provided in which a wireless IC tag is fixed to a first or second body, such that at least part of the wireless IC tag is positioned more frontward than a front end of a first ring and a front end of a second ring and more backward than a support. A winding axis of an inductor is orthogonal to the up-down direction and intersects the front-back direction so that electric, magnetic, or electromagnetic field coupling is established between a resonant circuit and a metal medical instrument. Moreover, the metal medical instrument either emits a transmission signal, which has a frequency equal to a predetermined resonant frequency and supplied from the resonant circuit, as an electromagnetic wave, or it receives a reception signal having a frequency equal to the predetermined resonant frequency as an electromagnetic wave, and supplies the reception signal to the resonant circuit.

A watch with a built-in tag that includes a display displaying a time, a metal case having a through-hole in a side surface, a metal crown disposed to enable opening and closing of the through-hole, and a wireless communication device housed inside the case. The crown includes a head located outside the case and coming into contact with the case to close the through-hole, and a shank extending to the inside of the case through the through-hole with one end portion connected to the head and the other end portion located inside the case. When the head of the crown is pulled in a direction away from the case, the head of the crown becomes contactless with the case to enable a reader device located outside the case to read information of the wireless communication device through the crown.

Watch with built-in tag and method of determining authenticity of watch with built-in tag

A wireless IC device includes a resin member including first and second surfaces, a substrate including first and second principal surfaces, a coil antenna provided in the resin member, and an RFIC element mounted on the substrate and connected to the coil antenna. The substrate is embedded in the resin member so that the second principal surface is at a second surface side. The coil antenna is defined by first linear conductor patterns on the second surface, first metal posts extending between the first and second surfaces, second metal posts extending between the first and second surfaces, and second linear conductor patterns on the first surface. The RFIC element is disposed in the coil antenna.

Wireless IC device

A UHF band RFID tag with stable communication characteristics when attached to a metal surface. The UHF band RFID tag includes a resin block having a first surface serving as an attaching surface to the metal surface and a second surface opposing the first surface, a substrate on a second surface side of the resin block, a RFIC element mounted on the substrate, and a loop electrode connected to the RFIC element. The loop electrode includes metal bodies provided in the resin block and extending in a direction intersecting the first and second surfaces, a flat plate electrode on a first surface side of the resin block and connecting first ends of the metal bodies, conductor patterns on the second surface side of the resin block and connecting the RFIC element and second ends of metal bodies.

UHF band RFID tag and UHF band RFID tagged article

An antenna device includes an RFIC element, a power supply coil connected to the RFIC element, and a first coil conductor including a first large-diameter loop shaped conductor and a first small-diameter loop shaped conductor. The first coil conductor functions as a booster antenna and forms an antenna resonance circuit. The power supply coil is accommodated in a recess surrounded by the first small-diameter loop shaped conductor. The power supply coil is disposed in a manner that its winding direction is aligned with the winding axis direction of the first small-diameter loop shaped conductor and its outer diameter is inside a coil opening of the first small-diameter loop shaped conductor in a planar view. The power supply coil is coupled to the first small-diameter loop shaped conductor through a magnetic field.

Antenna device and method of manufacturing the same

Wireless IC device, molded resin article, and method for manufacturing wireless IC device

An electronic key executes keyless entry communication or RFID communication. A wireless controller mounted on a vehicle executes keyless entry communication within a range of a radius of several meters to several tens of meters. An RFID reader is assigned to each door and executes RFID communication within a range of a radius of approximately 1 meter. In regards to unlocking the door, the wireless controller issues a password by the keyless entry communication, and a wireless circuit temporarily stores the issued password. The RFID readers search for the password stored in the electronic key by the RFID communication, and the wireless controller unlocks a door corresponding to the RFID reader for which the password was detected.

Door unlocking system and door unlocking method

A coupling assistance device is provided with a base material having a first principal surface, and a planar antenna provided at the base material. Moreover, the first principal surface of the base material has a first region to which a coil antenna of a portable telephone terminal is to be adjacent, and a second region to which a coil antenna of an RFID tag-containing article is to be adjacent. The planar antenna is provided from the first region over to the second region of the base material, and is coupled to the antenna of the portable telephone terminal in the first region and to the antenna of the RFID tag-containing article in the second region.

Coupling assistance device and RFID communication system

An electronic key actively executes wireless communication following a keyless entry communication and passively executes wireless communication following a RFID communication. A vehicle control device is mounted on a vehicle and actively executes wireless communication following each of the keyless entry communication and RFID communication. An ECU/BCM unlocks a door by communicating with the electronic key using the keyless entry communication and issues a password to the electronic key in relation to this action. When a door knob or handle is pulled, an RFID-IC acquires the password issued by the ECU/BCM from the electronic key using the RFID communication and unlocks the door by authenticating the acquired password.

A microprocessor includes a memory, an input/output port and a switch controller. Transmission data, a spread code and an inverted code are stored in the memory. The switch controller generates a spread spectrum signal by calling up either of the spread code or the inverted code in accordance with a bit of the transmission data. A switch connected to the input/output port is switched on and off based on the spread spectrum signal. In addition, an antenna is connected to the input/output port via a coupler. An oscillation circuit includes a reference oscillator and a BPF and inputs a harmonic of a reference signal to the coupler as a carrier wave.

Spread spectrum communication device

A wireless communication apparatus includes a first communication system, and a second communication system configured to transmit a transmission signal in a communication frequency band which is the same or substantially the same as that of the first communication system and at an electric power which is stronger than that of a reception signal of the first communication system. The first communication system includes a feeder circuit having a resonant frequency, the resonant frequency being within the communication frequency band if a reception signal of the first communication system is input, and the resonant frequency being out of the communication frequency band if a transmission signal of the second communication system is input.

Growing community of inventors

Nagaokakyo, Japan

Makoto Yasutake