Abstract: An antenna device includes a first antenna (10) that radiates a first polarized wave; a second antenna (20) that radiates a second polarized wave; parasitic elements (11, 12, 21, 22); a base plate (30), and a switch group, the switch group including switches (111, 121, 211, 212, 221, 222) connected to the parasitic elements and switches (301 to 308) connected to the base plate.

Abstract: A power receiving device according to the present disclosure includes a power receiving section that receives power from a power feed device with use of a power receiving coil; and a communication section that transmits coil information to the power feed device, the coil information indicating whether or not a coil is provided near the power receiving coil.

Abstract: A communication device is provided which is able to start random access at an optimal transmission power when starting the random access, thereby reducing the number of times of failing to establish a connection to a base station and reducing power consumption of a user apparatus. A communication device is provided which includes: a communication section that receives, via a transceiving antenna, a reference signal to be transmitted from a base station; a measurement section that measures a reception-signal level on a basis of the reference signal received by the communication section; and a decision section that decides at least one of a transmission power or a number of times of transmission for starting random access to the base station, on a basis of the reception-signal level measured by the measurement section, and a difference between a gain in a reception frequency band of the transceiving antenna and a gain in a transmission frequency band of the transceiving antenna.

Abstract: An information communication device includes a transmission unit that wirelessly transmits a signal including data to a communication partner device via a transmission antenna, a reception unit that receives, via a reception antenna, an Ack signal wirelessly transmitted from the communication partner device; and a control unit that changes an antenna characteristic control mode of the transmission antenna, based on a reception state of the Ack signal received by the reception unit.

Abstract: An object is to, in a wireless communication device used in the vicinity of a human body and including a substrate and an antenna, increase a size of the antenna as large as possible and reduce an influence on the human body. An antenna device includes a ground substrate, a vertical antenna element, and a horizontal antenna element. The ground substrate is connected to a radio frequency signal source. The vertical antenna element has one end connected to a feed point to which a signal is supplied from the radio frequency signal source, and extends in a direction vertical to a substrate surface of the ground substrate. The horizontal antenna element is connected to another end of the vertical antenna element and extends in a horizontal direction parallel to the substrate surface.

Abstract: A power feeding apparatus is provided. The power feeding apparatus includes a power feeding unit configured to supply electric power to a power receiving apparatus through a magnetic field; a measuring unit configured to measure an electric characteristic value and to generate a measurement value; a power receiving unit configured to provide a set value; and a foreign substance detection unit configured to detect a foreign substance in the magnetic field based on the set value and the measurement value. A power receiving apparatus, a power feeding system, and a method of controlling power feeding are also provided.

Abstract: Methods and apparatus for detecting the presence of undesirable foreign matter in a region between a wireless power transmission apparatus and a power reception apparatus are described. First and second detection methods, based on different detection schemes, may be used to detect and distinguish the presence of foreign matter from misalignment during power transfer operation. A first detection method may be used before power is transferred to a load in a power reception apparatus, and a second detection method may be used while power is supplied to the load.

Abstract: A reception apparatus (10) includes plural antennas (101, 102) that are compatible with an LTE communication scheme and one reception processing section (100) processing a reception signal acquired by any one of the plural antennas (101, 102).

Abstract: The present technology relates an antenna apparatus and a communication apparatus that make it possible to miniaturize the antenna apparatus and improve communication performance. A solenoid-coil-type solenoid antenna and a metal plate disposed to have an overlapping portion with the solenoid antenna in a length direction of the solenoid antenna are included. The overlapping portion includes a portion corresponding to a length of 50% to 80% of a length of the solenoid antenna. Furthermore, a slit is formed in the metal plate, and the solenoid antenna is disposed in parallel to the slit. It is possible to apply the present technology to an antenna apparatus included in a communication apparatus that performs wireless communication.

Abstract: A communication apparatus and method, an antenna apparatus, and a communication system that prevent reduced communication characteristics are disclosed. In one example, a coupled antenna element positioned in the vicinity of a communication apparatus is detected, adaptation of impedance is controlled on the basis of the detection result, and wireless communication is performed via the coupled antenna element with the adapted impedance. In addition, an antenna element is excited by a wireless signal from a communication apparatus positioned in the vicinity of the antenna element, and this communication apparatus is notified of being positioned in the vicinity of this antenna element.

Abstract: A device for power transmission includes a power transmission section and a detection section. The power transmission section is configured to transmit an electric power wirelessly. The detection section is operatively connected to the power transmission section and configured to detect an object within a range from the power transmission section based on a change in impedance in vicinity of the power transmission section.

Abstract: A power feed device according to the present disclosure includes a power feed section that supplies power wirelessly to a power receiving device having a power receiving coil, a communication section that receives coil information transmitted from the power receiving device and indicating whether or not a coil is provided near the power receiving coil, and a controller that performs, on the basis of the coil information, a first determination as to whether or not to supply power to the power receiving device and controls an operation of the power feed section on the basis of a result of the first determination.

Abstract: A power feed system according to the present disclosure includes a power feed device and a power receiving device. The power receiving device includes a power receiving section that receives power wirelessly from the power feed device with use of a power receiving coil, and a first communication section that transmits, to the power feed device, coil information indicating whether or not a coil is provided near the power receiving coil. The power feed device includes a power feed section that supplies power wirelessly to the power receiving device, a second communication section that receives the coil information, and a controller that performs, on the basis of the coil information, a first determination as to whether or not to supply power to the power receiving device, and controls an operation of the power feed section on the basis of a result of the first determination.

Abstract: A communication apparatus of the present disclosure includes: an antenna unit including a first electrode and a second electrode; a communication circuit unit that performs communication using a human body as a communication medium via the antenna unit; and a series circuit including a switch and a capacitor that are coupled to each other in series, and coupled between the first electrode and the second electrode.

Abstract: An antenna device, including an antenna element constituted by a conductor, having a tubular shape, and including a long notch section formed to extend in an axial direction in at least a part of a side surface, a capacitor formed to bridge end portions of the notch section in a short direction, substantially at a center of the notch section in a longitudinal direction, and a power feed point formed at a position which is apart from the capacitor to a side of one end portion of the notch section in the longitudinal direction and corresponds to a side of one end portion of the notch section in the short direction.

Abstract: The present technology relates to communication apparatus and method, and a communication system that enable communication control according to a gain of an antenna element. In a communication apparatus that performs wireless communication via an antenna element, a state of a gain of the antenna element is detected, a threshold value for carrier sense is controlled on the basis of the state of the gain of the antenna element that has been detected, the carrier sense is performed to determine whether communication using the threshold value that has been set possible, and wireless communication is performed in a case where it is determined that the communication is possible. The present disclosure can be applied to, for example, a transmission apparatus, a reception apparatus, a transmission/reception apparatus, a communication apparatus, electronic equipment, a computer, a program, a storage medium, a system, and the like.

Abstract: A communication system of the disclosure includes: a transmitter that includes a first transmitting electrode and a second transmitting electrode, and causes a transmission signal to be generated between the first transmitting electrode and the second transmitting electrode; and a receiver including a first receiving electrode, a second receiving electrode, and a determiner, in which the first receiving electrode and the second receiving electrode each receive the transmission signal through a communication path that includes a human body, and the determiner determines that communication is valid in a case where a reception signal, generated between the first receiving electrode and the second receiving electrode, has a prescribed polarity, and determines that the communication is invalid in a case where the reception signal has a polarity different from the prescribed polarity.

Abstract: An antenna comprises a coil element comprising a core element and coil wound around the core element, the core element arranged along a longitudinal direction and having a first front surface and a second front surface. A first metallic plate element and a second metallic plate element are provided. The first metallic plate element is arranged on a first side of the core element and extends with its first end in the longitudinal direction beyond the first front surface of the core element and its second end in the longitudinal direction adjacent the core element. The second metallic plate element is arranged on a second side of the core element opposite said second side and extends with its first end in the longitudinal direction beyond the second front surface of the core element and its second end in the longitudinal direction adjacent the core element.

Abstract: An electromagnetically-coupled state detection circuit including a detection unit that measures a primary side Q value of a circuit containing a primary side coil electromagnetically coupled with a secondary side coil and power transmission efficiency to the secondary side coil, corrects the power transmission efficiency based on the Q value of the primary side coil, and detects a state of electromagnetic coupling with the secondary side coil based on an obtained corrected value of the power transmission efficiency.

Abstract: Provided is a non-contact electric power feeding system including an electric power feeding device, and an electric power receiving device configured to receive electric power fed from the electric power feeding device. The electric power feeding device includes a primary-side coil, a driver, a primary-side control unit, and a primary-side communication unit. The electric power receiving device includes a secondary-side coil, a rectifier unit, a regulator, a secondary-side communication unit, and a secondary-side control unit.