Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An antenna device includes a ground layer, a first insulating layer, a second insulating layer layered on the ground layer and disposed under a first insulating layer, a patch antenna layered on the first insulating layer for emitting a circularly polarized radio wave, and a parasitic element provided between the first insulating layer and the second insulating layer. The patch antenna includes first and second feed points located in vicinity of a periphery of the patch antenna, which are respectively configured to receive high frequency electrical power having a 90-degree phase difference. The parasitic element is placed in a planar view so as to overlap with at least a part of the periphery of the patch antenna close to the first feed point and the second feed point.

Abstract: 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 s

Abstract: An antenna apparatus includes N (2=<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.

Abstract: 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.

Abstract: 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.

Abstract: A base station includes a plurality of antenna elements, a grouping module that forms a plurality of groups in which a plurality of mobile stations for which degree of mutual interference among the mobile stations is below a threshold are grouped in an identical group, and a forming module that simultaneously forms a plurality of beams for a plurality of mobile stations that belong to a single group for each group of the plurality of groups by using the plurality of antenna elements.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A laminated waveguide includes: a dielectric layer, a first and a second patch antennae formed on a first face of the dielectric layer, a third and a fourth patch antennae formed on a second face of the dielectric layer, the first face being opposite to the second surface, a first and a second transmission lines formed on the dielectric layer and connected to the first and the second patch antennae, respectively, a third and a fourth transmission lines formed on the dielectric layer and connected to the third and the fourth patch antennae, respectively, wherein a pair of the first and the third patch antennae and another pair of the second and the fourth patch antennae are arranged to form an angle between the pair and the another pair so as to suppress interference between the pair and the another pair.

Abstract: 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.

Abstract: An antenna apparatus includes N (2=<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.

Abstract: 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 s