Murata Manufacturing Co., Ltd.

Murata Mfg. Co., Ltd.

Koji Shiroki

Noboru Kato

Harufumi Mandai

Kenji Asakura

Teruhisa Tsuru

Yuya Dokai

Seiji Kanba

Nobuo Ikemoto

Kenichi Ishizuka

Makoto Takeoka

Satoshi Ishino

Noriyuki Ueki

Ikuhei Kimura

Tsutomu Ieki

Hirotaka Fujii

Hiromasa Koyama

Takeshi Kataya

Yoichi Saito

Atsushi Tojyo

Haruhumi Mandai

Takeshi Kurihara

Makoto Osamura

Ken Sakai

Seiji Kanaba

Masami Mizuyama

In a transceiver, on a top surface of a rectangular plate-shaped substrate, transmission radiating elements and receiving radiating elements are provided. The transmission radiating elements extend in the horizontal or lateral direction from the center of the substrate. The receiving radiating elements extend in the vertical or longitudinal direction from the center of the substrate. Inductors included in a matching feeding element are individually electromagnetically coupled to transmission-side feeding points that are inner end portions of the transmission radiating elements and receiving-side feeding points that are inner end portions of the receiving radiating elements. A transmission signal is transmitted with a wave polarized in the horizontal or lateral direction, and a signal having a vertical or longitudinal polarization direction is received.

Transceiver and radio frequency identification tag reader

An antenna device includes an impedance-matching switching circuit connected to a feeding circuit, and a radiating element. The impedance-matching switching circuit matches the impedance of the radiating element as a second high frequency circuit element and the impedance of the feeding circuit as a first high frequency circuit element. The impedance-matching switching circuit includes a transformer matching circuit and a series active circuit. The transformer matching circuit matches the real parts of the impedance and matches the imaginary parts of the impedance in the series active circuit. Thus, impedance matching is performed over a wide frequency band at a point at which high frequency circuits or elements having different impedances are connected to each other.

Impedance-matching switching circuit, antenna device, high-frequency power amplifying device, and communication terminal apparatus

A communication terminal device includes a printed wiring board disposed in a casing, a feed pattern provided on a main surface of the printed wiring board, a radiation plate including a substantially planar radiation portion substantially perpendicular to the main surface of the printed wiring board and a lead portion connecting the radiation portion to the feed pattern, and a component mounted on the main surface of the printed wiring board to overlap the lead portion when the main surface of the printed wiring board is viewed from above, the component including a conductive material, a magnetic material and/or a dielectric material. The radiation portion is connected to the lead portion at a side spaced away from the main surface of the printed wiring board, and an area of the lead portion is located at a predetermined distance from the main surface of the printed wiring board.

Communication terminal device and manufacturing method thereof

A transmission line portion of a flat cable that is bent at a position along the longitudinal direction includes a dielectric element body, a first ground conductor, and a second ground conductor. The dielectric element body includes a signal conductor at the middle position of the thickness direction. The first ground conductor includes elongated conductors and bridge conductors. The elongated conductors are spaced in the width direction of the dielectric element body, and extend in the longitudinal direction. The bridge conductors connect the elongated conductors at spacings along the longitudinal direction. The spacing of bridge conductors across the bending point in a bent portion is smaller than the spacing of adjacent bridge conductors located in a straight portion.

Flat cable and electronic apparatus

An RFID chip package includes an RFID chip including a voltage booster circuit and processing an RF signal in a UHF band and a power supply circuit connected to the RFID chip and including at least one inductance element. A reactance component of an input/output impedance at an antenna-connecting input/output terminal of the power supply circuit is substantially 0&#x3a9;.

RFID chip package and RFID tag

A printed wiring board includes a circuit substrate on which sheets are laminated, a wireless IC element provided on the sheet, a radiator provided on the sheet, and a loop-shaped electrode defined by first planar conductors, via hole conductors, and one side of the radiator, coupled to the wireless IC element. The first planar conductors are coupled to the radiator and the second planar conductors by auxiliary electrodes.

Printed wiring board and wireless communication system

A composite printed wiring board includes a parent board and a child board that is mounted on the parent board. A wireless IC element that processes a high-frequency signal, a loop-shaped electrode that is coupled to the wireless IC element, and a first radiator that is coupled to the loop-shaped electrode are provided on the child board. A second radiator that is coupled to the loop-shaped electrode via an electromagnetic field is provided on the parent board.

Composite printed wiring board and wireless communication system

A high-frequency device includes a wireless IC chip and a board which is coupled to the wireless IC chip and electrically connected to radiator plates, and an inductor and/or a capacitance are provided as a static electricity countermeasure element in the board. The inductor is connected in parallel between the wireless IC chip and the radiator plates, and its impedance at the frequency of static electricity is less than an impedance of the wireless IC chip.

High-frequency device and wireless IC device

An RFIC module includes an RFIC chip that is mounted on a mounting substrate and that is encapsulated with an encapsulation resin layer. The mounting substrate includes a flexible base and electrodes provided on the flexible base. External terminals are disposed near four corners of a mounting surface of the RFIC chip. One of a plurality of mounting lands located on the surface of the flexible base is a shared mounting land and defines an integrated mounting land that is shared by an RF terminal and an NC terminal of the RFIC chip. The shared mounting land is arranged to cover one side of the RFIC chip when viewed from above.

RFIC chip mounting structure

A wireless communication device includes a wireless IC device, a dielectric substrate, and a metal plate. A radiation conductor coupled to the wireless IC device is provided on the front surface of the dielectric substrate, and a ground conductor connected to the radiation conductor through an interlayer connection conductor is provided on a back surface. The dielectric substrate is fixed to the metal plate via an insulating adhesive, and is crimped by a conductive member. The front and back surfaces of the metal plate are electrically connected to each other by the conductive member, and when a high-frequency signal is supplied from the wireless IC device, a high-frequency signal current on the front surface side of the metal plate is conducted to the back surface side of the metal plate through a surface boundary portion between the conductive member and the metal plate, and radiated as a high-frequency signal.

Wireless communication device and metal article

A wireless IC device and an electronic apparatus are obtained, which can achieve miniaturization and improve the gain of a radiator plate (electrode) without providing a dedicated antenna. A wireless IC device is provided, in which a loop electrode is provided in a ground electrode provided on a printed wiring circuit board, and in which a wireless IC chip that processes a transmission/reception signal or an electromagnetic coupling module is coupled to the loop electrode. The ground electrode is coupled to the wireless IC chip or the electromagnetic coupling module via the loop electrode, and transmits or receives a high-frequency signal. The ground electrode is formed with a slit for adjusting a resonant frequency thereof.

Wireless IC device, electronic apparatus, and method for adjusting resonant frequency of wireless IC device

A chip antenna capable of reducing the spiral pitch of an antenna line to be smaller than that of a conventional one. Conductor patterns are electrically connected sequentially in series through via holes so as to form a spiral antenna line. The antenna line has a winding axis which is arranged either in a zigzag manner or along a straight line. Adjacent wound portions have an equal diameter or width or the adjacent portions may have unequal widths. Since adjacent via holes are arranged in a staggered arrangement with each other, the distance between the adjacent via holes is larger than the spiral pitch of the antenna line, allowing the adjacent portions to be closer together than a conventional chip antenna, thereby allowing the resonance frequency to be reduced.

Chip antenna

A portable telephone includes a portable telephone body made from plastic having a receiver, a transmitter, and dial keys, and a chip antenna which is mounted on a circuit board secured at the inside of the portable telephone body and which is electrically connected to an RF section provided on the circuit board in the portable telephone. The chip antenna is disposed near the transmitter at a location where a transmitted electromagnetic signal is unlikely to be affected by the body of a person who is holding the portable telephone.

Mobile communication apparatus

An antenna device, comprising an antenna unit including basic body comprising at least one of dielectric ceramic and magnetic ceramic, at least one conductor disposed at least one of inside and on a surface of the basic body, and a feeding electrode for applying a voltage to the conductor disposed on the surface of the basic body; a mounting board on which the antenna unit is mounted; a ground part in association with the mounting board and adapted to resonate with the antenna unit; and a length in the polarization direction of a radio wave of the ground part being about &lgr;/4 or more, where &lgr; is a wavelength of the radio wave, the basic body comprising a first generally planar sheet having a plurality of spaced, first conductors formed on one major surface thereof and a second generally planar sheet having a plurality of spaced second conductors formed on one major surface thereof; the first and second generally planar sheets being laminated together to form an elongated structure wherein respective pairs of the first and second conductors are coupled to one another to form respective spiral loops of a spiral antenna so that a central axis of the spiral antenna extends generally parallel to a longitudinal direction of the elongated structure; each of the sheets being formed of a material having a permeability of 1<&mgr;<7 or a dielectric constant &egr; of 1<&egr;<130; and a feeding terminal coupled to one end of the spiral antenna so that the antenna unit forms a mono-pole antenna, the antenna unit and the ground part together functioning as a dipole antenna.

Growing community of inventors

Nagaokakyo, Japan

Koji Shiroki