Abstract: An acquisition unit in a control apparatus acquires information about interference received, from a signal transmitted from a non-terrestrial network apparatus, by a signal directly transmitted from a non-terrestrial network apparatus to a terminal apparatus. A path control unit selects a usage communication path from a direct path and an indirect path, based on the information about the interference. The “direct path” is a path in which a signal is directly transmitted from the non-terrestrial network apparatus to the terminal apparatus. The “indirect path” is a path in which a signal transmitted from the non-terrestrial network apparatus indirectly reaches the terminal apparatus via an RIS of a terrestrial relay apparatus.

Abstract: The objective is to provide a radio wave control system, which is capable of performing beamforming of a plurality of signals having different frequencies with a simple configuration. A radio wave control system according to the present disclosure includes a transmission apparatus (10) that transmits a first signal having a first frequency and a second signal having a second frequency, a reflector device (20) that reflects or transmits the first signal and the second signal in periodically disposed antenna elements and perform beamforming of the first signal and the second signal in respectively different directions, and a control apparatus (30) that controls directions in which beamforming of the first signal and the second signal is performed by controlling phases of the first signal and the second signal by electrically controlling the antenna elements.

Abstract: A radio wave control system according to the present disclosure includes a high power amplifier that generates broadband local signals including a first local signal having a first frequency and a second local signal having a second frequency, a reflective plate that modulates, when the first local signal and the second local signal are reflected by or transmitted through periodically disposed antenna elements, the first local signal and the second local signal, and beam-forms the first modulated signal and the second modulated signal in respectively different directions, and a control apparatus that controls directions in which the first modulated signal and the second modulated signal are beam-formed by electrically controlling the antenna elements and controlling phases of the first local signal and the second local signal incident on the reflective plate.

Abstract: A sweep control unit in a control apparatus performs sweep control for sequentially matching a direction of a reception beam of a communication terminal with each of a plurality of measurement directions included in a reception sweep range. An acquisition unit acquires received signal strength in each measurement direction. An acquisition unit acquires a result of demodulating the received signal in each measurement direction. A specifying unit specifies a direction of a desired wave and a direction of an interference wave on the basis of the received signal strength and the result of demodulating. A determination unit determines a direction of use of the reception beam on the basis of the direction of the desired wave and the direction of the interference wave that are specified by the specifying unit.

Abstract: The object is to provide a radio wave control system that is capable of suppressing radio wave interference. A radio wave control system according to the present disclosure includes a reflective plate (10) configured to reflect an undesired radio wave that causes interference for a communication apparatus, a control unit (21) that causes a reflected wave of the undesired radio wave to be transmitted in a direction in which the communication apparatus is present, and a communication unit (22) that receives interference information indicating an interference state in the communication apparatus, and the control unit (21) determines a phase of the reflected wave reaching the communication apparatus by using the interference information.

Abstract: A planar antenna device that includes a first substrate having a patch antenna, a dielectric, and a second substrate. The second substrate includes a matrix circuit including a transistor pair including a first thin-film transistor and a second thin-film transistor, a first signal line to which a signal to be transmitted is input, a phase shift element including a plurality of phase shift wires, a second signal line electromagnetically coupled to the patch antenna via the slot, and a switch group configured by a first switching element having a first end of a channel connected to one end of the plurality of phase shift wires and a control electrode connected to the first thin-film transistor, and a second switching element having a first end of the channel connected to the other end of the plurality of phase shift wires and a control electrode connected to the second thin-film transistor.

Abstract: Provided is a display antenna including a display including a plurality of light emitters arranged in a grid, an antenna array having an antenna assembly in which a plurality of patch antennas through which light in a wavelength band of a visible region is transmitted is disposed in a grid, the antenna array being disposed to be superimposed on the display, and a phase shifter disposed in a gap region sandwiched between the plurality of light emitters, connected to at least one of the plurality of patch antennas, and configured to shift a signal to be transmitted and received.

Abstract: A display communication processing apparatus including a plurality of antennas, a link controller, a communication controller and a display, wherein the plurality of antennas are provided on a display screen of the display, a with link a n adjacent display communication processing apparatus via a first antenna of the plurality of antennas is established by the link controller, a network is connected via the first antenna by the communication controller, a predetermined communication setting for a third antenna of the plurality of antennas is set by the communication controller, when a connection request is received from a terminal apparatus via a second antenna of the plurality of antennas, and a service from the network to the terminal apparatus via the third antenna is provided by the communication controller.

Abstract: Provided is an antenna device including an antenna array including a plurality of patch antennas arrayed in a grid, a first switch group including a first switch disposed on a wiring line connecting two adjacent patch antennas, and a second switch group including a second switch disposed on a wiring line between an antenna assembly formed by at least four adjacent patch antennas and a signal source connected to at least one patch antenna constituting the antenna assembly.

Abstract: A transmitter/receiver that includes a spherical radio wave lens in which a meta-surface converging a desired radio wave which is a transmitting/receiving target is formed and a plurality of array antennas that are arranged to face the spherical radio wave lens, and include antenna units that transmit and receive the desired radio wave which is the transmitting/receiving target and are arranged in accordance with focal positions of the spherical radio wave lens.

Abstract: In one aspect of the present example embodiment, a modulation control apparatus includes at least one memory configured to store an instruction, and at least one processor configured to execute the instruction, wherein the processor, by executing the instruction, acquires data relating to a temperature during a predetermined period, and sets signal point arrangement used for modulation of a transmission signal in such a way that the signal point arrangement used for modulation of the transmission signal is switched to different signal point arrangement during the predetermined period, based on the data relating to the temperature.

Abstract: An antenna element receives a first radio wave and outputs a transmission signal, and receives a second radio wave and outputs a reception signal. A phase conversion unit applies a predetermined phase shift amount to a signal to be input and then output the signal. A switch connects the antenna element to one of the phase conversion unit and external receiver. When the first radio wave enters the antenna, the switch connects the antenna element to the phase conversion unit, and the transmission signal to which the predetermined phase shift amount has been applied is radiated from the antenna element. A third radio wave radiated from each of a plurality of RIS elements is deflected in a predetermined direction. When the second radio wave enters the antenna, the switch connects the antenna element to the external receiver, and the external receiver receives the reception signal.

Abstract: A positioning method of the present disclosure includes: generating first observation data through observation of phases of a plurality of carrier waves transmitted from a plurality of transmitting stations in a first satellite; generating second observation data through observation of the phases of the plurality of the carrier waves in a second satellite; performing phase difference calculation to calculate a phase difference of the plurality of the carrier waves observed in the first satellite and the second satellite using the first observation data and the second observation data; performing base line vector calculation to calculate a base line vector indicating relative positions of the first satellite and the second satellite based on the phase difference calculated by performing the phase difference calculation; and performing the phase difference calculation and the base line vector calculation by either one of the second satellite or a positioning apparatus located on the ground.

Abstract: A communication control system includes at least one processor, and the at least one processor carries out: a predicting process of making predictions of a future status of communication of a communication system in a plurality of stages; and a controlling process of performing control of the communication system, the control being based on a result of a prediction in each of the plurality of stages, and in the controlling process, the at least one processor determines, in accordance with the result of the prediction in one of the plurality of stages, whether it is necessary to move the air vehicle and controls the air vehicle.

Abstract: To provide a communication terminal apparatus, a communication satellite apparatus, and a satellite communication system, capable of facilitating rapid determination of the direction of a beam. A communication terminal apparatus (10) is a communication terminal apparatus configured to communicate with a communication satellite apparatus (20) by means of a radio beam, the apparatus including: an antenna (11) configured to receive a plurality of beacons (Fa1 to Fa3) from at least one communication satellite apparatus, and to transmit and receive a directional radio beam; and at least one processor executing a control process of determining a plurality of candidate directions of the radio beam to be transmitted, on the basis of information included in the plurality of beacons.

Abstract: A communication control apparatus which controls communication between a plurality of communication terminals each located in any one of a plurality of areas and a plurality of base station includes at least one processor, the at least one processor carrying out a control process in which a directivity direction of each of antennas of the plurality of communication terminals is determined, on the basis of: terminal location prediction information in which locations of the plurality of communication terminals are predicted; and an electric wave environment database in which the plurality of base stations, beam directions of respective electric waves from the base stations, the plurality of areas, and reception powers of the respective electric waves in the plurality of areas are associated with each other.

Abstract: A transmission apparatus according to one aspect of the present disclosure includes an antenna that emits a radio wave to space, a reflector that reflects a radio wave emitted from the antenna, and a reconfigurable intelligent surface (RIS) reflecting plate that reflects a radio wave from the reflector and thereby transmits the reflected radio wave to a transmission target.

Abstract: An amplifier amplifies an input signal. A radiation unit radiates a radio wave into space, based on the input signal amplified by the amplifier. A first reflection unit reflects the radio wave radiated from the radiation unit. A second reflection unit configured as a reconfigurable intelligent metasurface (RIS) reflecting plate reflects the radio wave from the first reflection unit and thereby transmits the radio wave to a transmission target. A control unit controls the second reflection unit. The second reflection unit reflects the radio wave at a target reflection angle that represents a reflection angle toward the transmission target, by reflecting the radio wave at a reflection angle acquired by adding an offset to a reflection angle specified by the control unit, based on the target reflection angle.

Abstract: A communication apparatus according to the present disclosure includes a receiver configured to receive upward data being transmitted from a terminal during an upward period from a terminal transmission start time to a terminal transmission end time in an upward slot, during an own apparatus reception period being equal in length to the upward period from an own apparatus reception start time being later than the terminal transmission start time by a propagation delay time; and a transmitter configured to transmit downward data during an own apparatus transmission period being equal in length to a downward period from an own apparatus transmission start time being earlier than a terminal reception start time by the propagation delay time, in such a way that the terminal receives the downward data during the downward period from the terminal reception start time to a terminal reception end time in a downward slot.

Abstract: Provided is a display antenna including a display including a plurality of light emitters arranged in a grid, an antenna array having an antenna assembly in which a plurality of patch antennas through which light in a wavelength band of a visible region is transmitted is disposed in a grid, the antenna array being disposed to be superimposed on the display, and a phase shifter disposed in a gap region sandwiched between the plurality of light emitters, connected to at least one of the plurality of patch antennas, and configured to shift a signal to be transmitted and received.