Abstract: A wireless device is configured to perform wireless communication with one or more terminals and includes an antenna configured to perform wireless communication, a wireless interface configured to perform wireless communication with the one or more terminals through the antenna, and a processor configured to acquire an azimuth and a weighting coefficient of each of the one or more terminals, and determine a direction of the antenna based on the azimuth and the weighting coefficient of each of the one or more terminals.

Abstract: A communication device includes: a distance information acquisition unit configured to acquire distance information indicating a distance to a communication target; a setting information acquisition unit configured to acquire setting information including a communication distance; and a communication unit configured to communicate with the communication target. The distance information acquisition unit acquires the distance information after the communication unit establishes connection with the communication target. The communication unit cuts the connection with the communication target when the distance information does not satisfy the communication distance included in the setting information.

Abstract: An inter-vehicle communication system is a system that provides communication between vehicles with use of a beam having a directivity and includes a first antenna and a second antenna. The first antenna is provided to a first vehicle, and performs wireless communication. The second antenna is provided to a second vehicle coupled to the first vehicle, and performs wireless communication. The second antenna emits a beam toward the first antenna. In a state where the first vehicle and the second vehicle are aligned to each other, a position in a horizontal direction of the first antenna is different from a position in the horizontal direction of the second antenna.

Abstract: An antenna apparatus includes a dielectric substrate, a feed element, a front array, and side arrays. The feed element, front array, and side arrays are formed on the dielectric substrate. The antenna apparatus includes mounting pads on the dielectric substrate, for coupling the antenna apparatus to another substrate by means of soldering. A part of the mounting pads are formed in a region located in a first direction when viewed from the feed element and front array, with a part of parasitic elements of the side arrays being interposed between these mounting pads and the feed element and front array. The other part of the mounting pads are formed in a region in a second direction when viewed from the feed element and front array, with another part of the parasitic elements of the side arrays being interposed between these mounting pads and the feed element and front array.

Abstract: An antenna apparatus is provided with: a dielectric substrate, a front array including a feed element and a plurality of parasitic elements, the feed element being formed on the dielectric substrate and having one radiation direction, and the plurality of parasitic elements being formed on the dielectric substrate in an area located in the radiation direction with respect to the feed element; and at least one side array including a plurality of parasitic elements formed on the dielectric a substrate in at least an area located in a direction other than the radiation direction with respect to the feed element. The plurality of parasitic elements of each side array are aligned substantially along the radiation direction.

Abstract: In each parasitic element array, parasitic elements, each having a strip shape substantially parallel to a longitudinal direction of a dipole antenna, are formed at predetermined intervals. The parasitic element arrays are arranged such that a plurality of gaps are formed to propagate a radio wave from the dipole antenna, and that a center axis of the dipole antenna and a center axis of a parasitic element group composed of a plurality of parasitic element arrays do not overlap each other, where the center axis of the dipole antenna extends in a wave-guiding direction of a radio frequency signal from a center of the longitudinal direction of the dipole antenna, and the center axis of the parasitic element group extends in the wave-guiding direction of the radio frequency signal from a center of the parasitic element group in the longitudinal direction of the dipole antenna.

Abstract: An antenna apparatus is provided with: a dielectric substrate, a front array including a feed element and a plurality of parasitic elements, the feed element being formed on the dielectric substrate and having one radiation direction, and the plurality of parasitic elements being formed on the dielectric substrate in an area located in the radiation direction with respect to the feed element; and at least one side array including a plurality of parasitic elements formed on the dielectric a substrate in at least an area located in a direction other than the radiation direction with respect to the feed element. The plurality of parasitic elements of each side array are aligned substantially along the radiation direction.

Abstract: In each parasitic element array, each of parasitic elements has a strip shape substantially parallel to a longitudinal direction of a dipole antenna, and the parasitic elements are formed at predetermined intervals. For example, the interval is set to be equal to or smaller than ? of a wavelength ? of a high-frequency signal to be fed to a feeder line. The parasitic element arrays are arranged so as to form a plurality of pseudo-slot openings that allow a radio wave from the dipole antenna to propagate therethrough as magnetic currents.

Abstract: A wireless communications apparatus (1) in the present invention transmits, via wireless communications, data recorded on a memory unit (13) to a recording apparatus (2). The wireless communications apparatus (1) includes: a communication area determining unit (19) determining whether or not the wireless communications apparatus (1) is in a communication area having a threshold value equal to MIDDLE or higher; a stillness detecting unit (15) detecting whether or not the wireless communications apparatus (1) remains still; and a wireless communications unit (17) starting to transmit, via the wireless communications, the data recorded on the memory unit (13) to the recording apparatus (2) in the case where (i) the communication area determining unit (19) determines that the wireless communications apparatus (1) is in the communication area having the threshold value equal to MIDDLE or higher, and (ii) the stillness detecting unit (15) detects that the wireless communications apparatus (1) remains still.

Abstract: An antenna unit is provided with: steerable antennas, each having one active antenna element and two parasitic antenna element; and metal blocks. Each of the active antenna elements is associated with at least one of the metal blocks such that the metal block is disposed remote from the active antenna element by a predetermined distance and operates as a reflector for the active antenna element. Each of the parasitic antenna elements is provided with a switching circuit for changing an electrical length of the parasitic antenna element, and the parasitic antenna element operates as a reflector for an active antenna element of the same steerable antenna as the parasitic antenna element by changing the electrical length using the switching circuit.

Abstract: An antenna apparatus includes an antenna element and a parasitic element provided on a first surface of a dielectric substrate, and an antenna element and a parasitic element provided on a second surface of the dielectric substrate. Each of the parasitic elements is provided at a position away from the antenna elements by a distance of one-fourth of an operating wavelength ? in communication.

Abstract: A variable directivity antenna apparatus is configured to include a parasitic element, a plurality of antenna elements each provided to be away from the parasitic element by an electrical length of a quarter-wavelength, and a PIN diode connected to the parasitic element and changing over whether or not to ground the parasitic element. A radiation pattern from the variable directivity antenna apparatus is changed by outputting a control signal for changing over whether or not the parasitic element operates as a parasitic element by selectively turning on or off the PIN diode.

Abstract: A plurality of directional patterns are classified into groups and stored in a directional pattern memory, such that among the plurality of directional patterns, the directional patterns strongly correlated with each other are classified into the same group, while the directional patterns weakly correlated with each other are classified into the different groups. One directional pattern is selected from each group in the directional pattern memory. One directional pattern is determined from the selected directional patterns, in accordance with a communication quality of signals each received when each one of the selected directional patterns is set for steerable antenna element. The determined directional pattern is set for the steerable antenna element.

Abstract: Before start of streaming, a server apparatus obtains from client apparatuses their respective numbers of antenna combinations, determines a training time t1 according to the maximum of the numbers of antenna combinations, and notifies the client apparatuses of the training time t1. Each client apparatus determines a training time t2 required to estimate transmission path conditions for one antenna combination, based on the training time t1. The server apparatus transmits a training signal during the training time t1. Each client apparatus estimates transmission path conditions using the training signal during the training time t2 for each antenna combination, and selects and sets an antenna combination based on the estimated transmission path conditions.

Abstract: An antenna unit is provided with: steerable antennas, each having one active antenna element and two parasitic antenna element; and metal blocks. Each of the active antenna elements is associated with at least one of the metal blocks such that the metal block is disposed remote from the active antenna element by a predetermined distance and operates as a reflector for the active antenna element. Each of the parasitic antenna elements is provided with a switching circuit for changing an electrical length of the parasitic antenna element, and the parasitic antenna element operates as a reflector for an active antenna element of the same steerable antenna as the parasitic antenna element by changing the electrical length using the switching circuit.

Abstract: A steerable antenna includes an radiating antenna element and parasitic antenna elements. Each of the parasitic antenna elements is provided with a pair of PIN diodes. On each of control lines connecting the PIN diodes to a controller, inductors are provided at predetermined intervals on portions of the control line electromagnetically coupled to another steerable antenna. The intervals for providing the inductors is set to such a length that substantially no resonance occurs in a section of the control line between the inductors at an operating frequency of the steerable antenna.

Abstract: A wireless communications apparatus (1) in the present invention transmits, via wireless communications, data recorded on a memory unit (13) to a recording apparatus (2). The wireless communications apparatus (1) includes: a communication area determining unit (19) determining whether or not the wireless communications apparatus (1) is in a communication area having a threshold value equal to MIDDLE or higher; a stillness detecting unit (15) detecting whether or not the wireless communications apparatus (1) remains still; and a wireless communications unit (17) starting to transmit, via the wireless communications, the data recorded on the memory unit (13) to the recording apparatus (2) in the case where (i) the communication area determining unit (19) determines that the wireless communications apparatus (1) is in the communication area having the threshold value equal to MIDDLE or higher, and (ii) the stillness detecting unit (15) detects that the wireless communications apparatus (1) remains still.

Abstract: An antenna apparatus includes an antenna element and a parasitic element provided on a first surface of a dielectric substrate, and an antenna element and a parasitic element provided on a second surface of the dielectric substrate. Each of the parasitic elements is provided at a position away from the antenna elements by a distance of one-fourth of an operating wavelength ? in communication.

Abstract: A plurality of directional patterns are classified into groups and stored in a directional pattern memory, such that among the plurality of directional patterns, the directional patterns strongly correlated with each other are classified into the same group, while the directional patterns weakly correlated with each other are classified into the different groups. One directional pattern is selected from each group in the directional pattern memory. One directional pattern is determined from the selected directional patterns, in accordance with a communication quality of signals each received when each one of the selected directional patterns is set for steerable antenna element. The determined directional pattern is set for the steerable antenna element.

Abstract: A variable directivity antenna apparatus is configured to include a parasitic element, a plurality of antenna elements each provided to be away from the parasitic element by an electrical length of a quarter-wavelength, and a PIN diode connected to the parasitic element and changing over whether or not to ground the parasitic element. A radiation pattern from the variable directivity antenna apparatus is changed by outputting a control signal for changing over whether or not the parasitic element operates as a parasitic element by selectively turning on or off the PIN diode.