Abstract: A wireless communications system for performing data communications between a data transmission side wireless communications device and a data receiving side wireless communications device. In the system, random back-off access control is performed until a connection is established between the data transmission side wireless communications device and the data receiving side wireless communications device. Then, after the connection is established, asymmetric IFS access control is performed.

Abstract: In a data transfer system in which wireless data transmission is carried out between a first device and a second device that each has a UWB wireless device, the data transfer system includes a ranging unit that is provided in the UWB wireless device of at least one of the first and second devices and measures a distance to the other of the first and second devices; a distance determination unit that determines, based on a measurement result by the ranging unit, whether or not the distance between the first and second devices has been within such a predetermined range that a predetermined transmission rate and a predetermined transmission quality are obtained by UWB communication; and a data transfer unit that executes data transmission between the first and second devices in response to a determination by the distance determination unit that the distance between the first and second devices has been within the predetermined range.

Abstract: In a data transfer system in which wireless data transmission is carried out between a first device and a second device that each has a UWB wireless device, the data transfer system includes a ranging unit that is provided in the UWB wireless device of at least one of the first and second devices and measures a distance to the other of the first and second devices; a distance determination unit that determines, based on a measurement result by the ranging unit, whether or not the distance between the first and second devices has been within such a predetermined range that a predetermined transmission rate and a predetermined transmission quality are obtained by UWB communication; and a data transfer unit that executes data transmission between the first and second devices in response to a determination by the distance determination unit that the distance between the first and second devices has been within the predetermined range.

Abstract: A slot antenna including: a dielectric substrate; a conductor pattern formed on a first surface of the dielectric substrate; a ground layer formed on a second surface of the dielectric substrate; a feeding point disposed at substantially a center of one side of the conductor pattern; a microstrip line extending from the feeding point to substantially a center of the conductor pattern; and a slot made with a predetermined width at a position at which the slot straddles a center line of the dielectric substrate, the center line passing through the feeding point, in the ground layer.

Abstract: A wireless communications system for performing data communications between a data transmission side wireless communications device and a data receiving side wireless communications device. In the system, random back-off access control is performed until a connection is established between the data transmission side wireless communications device and the data receiving side wireless communications device. Then, after the connection is established, asymmetric IFS access control is performed.

Abstract: In a data transfer system in which wireless data transmission is carried out between a first device and a second device that each has a UWB wireless device, the data transfer system includes a ranging unit that is provided in the UWB wireless device of at least one of the first and second devices and measures a distance to the other of the first and second devices; a distance determination unit that determines, based on a measurement result by the ranging unit, whether or not the distance between the first and second devices has been within such a predetermined range that a predetermined transmission rate and a predetermined transmission quality are obtained by UWB communication; and a data transfer unit that executes data transmission between the first and second devices in response to a determination by the distance determination unit that the distance between the first and second devices has been within the predetermined range.

Abstract: A slot antenna including: a dielectric substrate; a conductor pattern formed on a first surface of the dielectric substrate; a ground layer formed on a second surface of the dielectric substrate; a feeding point disposed at substantially a center of one side of the conductor pattern; a microstrip line extending from the feeding point to substantially a center of the conductor pattern; and a slot made with a predetermined width at a position at which the slot straddles a center line of the dielectric substrate, the center line passing through the feeding point, in the ground layer.

Abstract: In a data transfer system in which wireless data transmission is carried out between a first device and a second device that each has a UWB wireless device, the data transfer system includes a ranging unit that is provided in the UWB wireless device of at least one of the first and second devices and measures a distance to the other of the first and second devices; a distance determination unit that determines, based on a measurement result by the ranging unit, whether or not the distance between the first and second devices has been within such a predetermined range that a predetermined transmission rate and a predetermined transmission quality are obtained by UWB communication; and a data transfer unit that executes data transmission between the first and second devices in response to a determination by the distance determination unit that the distance between the first and second devices has been within the predetermined range.