Fujitsu Corporation

Fujitsu Ten Limited

Shinko Electric Industries Co., Ltd.

Eudyna Devices Inc.

Yoji Ohashi

Toshihiro Shimura

Atsushi Honda

Kaoru Yokoo

Takenori Ohshima

Kazumi Kasai

Alexander Nikolaevich Lozhkin

Toshio Kawasaki

Nobuyuki Hayashi

Tomoyuki Abe

Kazuo Shirakawa

Tamio Saito

Tomoya Ota

Mitsuhiro Azuma

Shinya Iijima

Hiroshi Ashida

Debasis Dawn

Yoshihiro Kawasaki

Hiroshi Kurihara

Toru Maniwa

Hiroyoshi Ishikawa

Yasuyuki Oishi

Tomonori Sato

Kazuyuki Ozaki

Teruhisa Ninomiya

Yuichi Utsunomiya

Osamu Isaji

Tatsuya Kikuzuki

Shigekazu Kimura

Liang Zhou

Yasuhiro Kurono

Satoshi Nakamura

Naofumi Okubo

Ichirou Ida

Mitsuji Nunokawa

Tadahiro Sato

Shinichiro Kobayashi

Yukio Takeda

Keiichi Oguro

Takaharu Miyamoto

Edmar Camargo

Shunsuke Fujio

Hiroshi Okagawa

Fumio Miyagawa

Yusuke Furuumi

Zhengyi Li

Yusuke Kato

Katsuhiko Tsujihata

Kazunori Sato

Kunifumi Tamachi

An array antenna system includes DPD that suppresses first IMD in a first band adjacent to a band of a transmission signal, antenna elements that include a first element and a second element, phase shifters that each correspond to each of the elements and form a transmission signal directed to a predetermined direction and second IMD, by applying a weight to the signal and the second IMD in a second band adjacent to the first band, a first amplifier that amplifies the signal directed to the direction and first distortion serving as the second IMD, that are output from a first shifter of the first element, and a second amplifier that amplifies the signal directed to the direction and second distortion a phase of which is opposite to that of the first distortion serving as the second IMD, that are output from a second shifter of the second element.

Array antenna system and nonlinear distortion suppression method

A radio communication apparatus includes a plurality of antennas, a radio transmission unit configured to execute radio transmission processing on data to be transmitted from the plurality of antennas, and a processor connected to the radio transmission unit. The processor executes a process including acquiring beam group specification information that specifies a beam group that is capable of being formed when the data to be transmitted is transmitted, forming at least one beam included in the beam group, and correcting an envelope of a beam group using correction factors, the beam group including the at least one beam formed, the correction factors corresponding to the beam group specification information.

Radio communication apparatus and radio transmission method

A slot antenna apparatus that includes a waveguide including a sidewall and having an extending direction, a slot provided on the sidewall, and a dielectric member that is attached to the waveguide and is slidable in the extending direction with respect to the slot, the dielectric member including a first section and a second section, the first section covering the slot at a first slide position, the second section covering the slot at a second slide position next to the first slide position, and the first section and the second section having different relative permittivities or different thicknesses with each other.

Slot antenna apparatus, communication system, and method for adjusting angle of radio waves emitted from slot antenna apparatus

A multiantenna communication device forms a directional beam by adding an antenna weight to respective signals of a plurality of antenna elements. The multiantenna communication device includes: a processor that executes performing distortion compensation on a transmission signal by using a distortion compensation coefficient; a plurality of power amplifiers that are provided corresponding to the antenna elements, and that amplify the transmission signal subjected to the distortion compensation by the processor; a multiplexer that multiplexes signals output from the power amplifiers to feed back; and an analog/digital (A/D) converter that A/D converts a multiplex feedback signal that is obtained by the multiplexer, wherein the processor executes updating the distortion compensation coefficient by using the multiplex feedback signal A/D converted by the A/D converter and the transmission signal.

Multiantenna communication device and coefficient update method

A stacked-waveguide substrate includes: a body configured to include a first dielectric-substrate, a second dielectric-substrate, and a third dielectric-substrate which are stacked in this order; a first conductor-pattern configured to be formed on a bottom surface of the first dielectric-substrate; a second conductor-pattern configured to be formed on a top surface of the third dielectric-substrate in a position corresponding to the first conductor-pattern; a first conductor-film configured to be located at an interface between the first dielectric-substrate and the second dielectric-substrate, and to have a first opening which faces the first conductor-pattern; a second conductor-film configured to be located at an interface between the second dielectric-substrate and the third dielectric-substrate, and to have a second opening which faces the second conductor-pattern; a first wiring line configured to cross the first opening to the first conductor-pattern; and a second wiring line configured to cross the second opening to the second conductor-pattern.

Stacked waveguide substrate, radio communication module, and radar system

An antenna apparatus includes N (2=&#x3c;N) transmitting antennas configured to transmit RF signals having Orbital Angular Momentum (OAM) of designated modes, and N receiving antennas configured to make N pairs with the N transmitting antennas, respectively, and to receive the RF signals having OAM of the designated modes transmitted from the corresponding N transmitting antennas within the N pairs.

Antenna apparatus

A wireless communication module includes an antenna on a first conductive wall among the conductive walls enclosing a closed space; a tag reader connected with the antenna to read an RFID tag in the closed space; and a reflective part having a thin film or plate shape between the first and second conductive walls facing each other. The reflective part partitions the closed space into first and second spaces. The antenna radiates a radio wave that is reflected by the reflective part to become a first reflected wave in the first space. The radio wave also transmits through the reflective part, reflected by the second conductive wall, and transmits through the reflective part to become a second reflected wave in the first space. The position of the reflective part is determined so that the first and second reflected waves are canceled by each other.

Wireless communication module, wireless communication system, and communication method

A wireless communication device includes a first housing including a first opening part; a second housing including a second opening part facing the first opening part, the second housing being arranged to face the first housing; a first resonance device including a first resonator, the first resonance device being arranged inside the first housing such that the first resonator is facing outside from the first opening part; and a second resonance device including a second resonator, the second resonance device being arranged inside the second housing such that the second resonator is facing outside from the second opening part and is facing the first resonator.

Wireless communication device and electronic device

A wireless communication device includes a delay circuit to generate four or more delay signals, an amplifier circuit amplifying the four or more delay signals to generate four or more amplified delay signals, and a combiner circuit combining at least two amplified delay signals to generate an output signal, a second phase of a second amplified delay signal is between a first phase of a first amplified delay signal and a third phase of a third amplified delay signal, gains of the amplifier circuit for the four or more delay signals are controlled such that the output signal is generated by combining the first amplified delay signal and the third amplified delay signal, and a phase of the output signal is between the first phase of the first amplified delay signal and the third phase of the third amplified delay signal.

Wireless communication device, control method of wireless communication device and phase shifter

In an in-vehicle radar device, as a vertical azimuth which is an azimuth of a target in a direction perpendicular to a ground surface, a real image vertical azimuth which is an azimuth of a real image existing above ground is calculated from a reflected wave generated when a transmission signal transmitted from a transmission antenna is reflected from the target, and a virtual image vertical azimuth which is an azimuth of a virtual image existing underground is calculated from a reflected wave generated when the transmission signal transmitted from the transmission antenna is reflected from the target and reflected again from the ground surface. Next, in the in-vehicle radar device, an angle difference between the real image vertical azimuth and the virtual image vertical azimuth is calculated, and a height of the target from the ground surface is calculated using the calculated angle difference.

Radar device and target height calculation method

A device includes a dielectric, wherein a front and a back of the dielectric for reflecting and transmitting an electromagnetic wave are defined by a first surface and a second surface, the first or second surface forming a half mirror, the first surface has a height that changes in spiral as leaving from the second surface, and the second surface has a height that changes in spiral as leaving from the first surface.

Device to reflect and transmit electromagnetic wave and antenna device

A wireless communication system includes first and second wireless communication apparatuses. The first wireless communication apparatus includes a plurality of communication units that perform communication in different frequency bands. The plurality of communication units transmits the same control signal and data in the different frequency bands to keep allocation of communication slots for the second wireless communication apparatus on a plurality of paths. When detecting a communication failure while connecting to and communicating with one communication unit through one path, the second wireless communication apparatus switches to another communication unit and continues the communication through another path.

Wireless communication system and wireless communication apparatus

In a radio communication system, a plurality of transmission antennas and a plurality of reception antennas are arranged such that a channel matrix having channel responses between the plurality of transmission antennas and the plurality of reception antennas as elements is a circulant matrix.

Radio communication system and radio communication method

A waveguide converter includes a waveguide including a hollow section through which a signal is transmitted and a first opening formed on a cross section of the hollow section in a direction orthogonal to a transmission direction of the signal, and a circuit board including on a same surface a signal line, a conductor patch connected to the signal line, and a second opening surrounding the conductor patch. The waveguide is fixed onto the circuit board. The first opening surrounds the second opening. The conductor patch includes a rectangular section which has short sides in parallel with short sides of the first opening, and has a first long side and a second long side connected to the signal line in parallel with long sides of the first opening, and protruding portions which are provided so as to touch the short sides near both ends of the second long side, respectively.

Waveguide converter

A detection and ranging system includes: a signal generator configured to generate M probe signals having different carrier frequencies; M transmitting elements configured to transmit the M probe signals; N receiving elements configured to receive an echo signal from a target; N demodulators provided for the N receiving elements, each of the demodulators being configured to generate a demodulated echo signal by demodulating an echo signal received by a corresponding one of the receiving elements by using at least one of the M probe signals, and to generate M sets of data signals corresponding to the M probe signals by filtering the demodulated echo signal in a frequency domain; and a signal processor configured to detect the target according to M&#xd7;N sets of data signals generated by the N demodulators.

System and method for detection and ranging

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Fucyu, Japan

Yoji Ohashi