Abstract: Methods for coordinating power usage and link adaptation in wireless communications are described. Terminals and/or access points (APs) may attempt to modify terminals' transmit power in relation to a desired communication data transfer rate. Link adoption may also be used in conjunction with the described methods.

Abstract: There is provided a resonator including a magnetic core and a coil wherein the magnetic core includes a first magnetic core block and a second magnetic core block, the coil is wound on the magnetic core, the first magnetic core block includes a first portion and second portions on sides of the first portion, a sectional area of the first portion is larger than each sectional area of the second portions, the second magnetic core block includes a third portion and fourth portions on sides of the third portion along its longitudinal direction, a sectional area of the third portion is larger than each sectional area of the fourth portions, and the coil is wound on the first portion and the third portion.

Abstract: A transformer between a waveguide and a transmission-line includes a high-frequency circuit module, transmission-lines, a waveguide, and feed pins. The high-frequency circuit module has differential-pair terminals to input and output a differential signal. The transmission-lines are connected to the differential-pair terminals. The waveguide includes first to third metal walls. The feed pins are connected to the transmission-lines inside of the waveguide. The feed pins have a first distance of approximately (?g/2) from each other. One of the feed pins has a second distance of approximately (?g*(1+2?)/4) from the third metal plane. “?g” is a wavelength in the waveguide and “?” is an integer which is equal or larger than “0”. Each of the feed pins has a third distance of approximately (a/2) from the first or second wall. “a” is length of the waveguide along the third metal wall.

Abstract: A measurement apparatus includes an anechoic chamber, a DUT board, rotation units, and a feeding arm. The anechoic chamber has inner-walls. Each inner-wall is covered with a radio wave absorber. One of the inner-wall is a first wall with an aperture and the other inner-walls are second walls. The DUT board holds a first antenna to be measured with radiation property and a probe to detect a signal from the first antenna. A part of the DUT board is inserted into the anechoic chamber through the aperture opened in the first wall. One end of the feeding arm holds a second antenna radiating a radio wave to the first antenna in the anechoic chamber. Each rotation unit provides on each second wall and is selectively attached to the other end of the feeding arm for rotating the second antenna and for feeding to the second antenna.

Abstract: A transmitter transmits both an electric power signal and an information signal. The electric power signal includes a first frequency. The information signal includes a second frequency different from the first frequency.

Abstract: A system and method for equalizing traffic between antenna beams is described. Aspects of the system and method may vary the beam widths to attempt to equalize traffic based on non-real-time communications and/or non-real-time communications.

Abstract: A radio apparatus according to one aspect of the embodiments includes a substrate configured to have a high-frequency circuit formed thereon. The high-frequency circuit includes an electromagnetic wave radiation source to radiate an electromagnetic wave. The radio apparatus also includes a shielding case configured to house the substrate and have a plurality of openings each having a length of half a wavelength of the electromagnetic wave in a direction orthogonal to a polarization of the electromagnetic wave. Each of the openings is provided to make each distance between centers of the openings to be shorter than one wavelength of the electromagnetic wave.

Abstract: According to one embodiment, a wireless power transmission system, includes a power transmission antenna and a power reception antenna. The power transmission antenna has a first resonance frequency and a first frequency bandwidth, and wirelessly transmits high-frequency energy having a first transmission frequency. The power reception antenna has a second resonance frequency and a second frequency bandwidth, and wirelessly receives the high-frequency energy. The second resonance frequency is higher than a highest frequency within the first frequency bandwidth. The first transmission frequency falls within the first frequency bandwidth.

Abstract: An antenna device of an embodiment includes: an antenna having a feeding point and an end portion apart from the feeding point, the end portion being an open end; a variable impedance matching circuit connected to the antenna at the feeding point; a probe placed in such a position that the distance from the end portion to a tip of the probe is equal to or shorter than one eighth of the wavelength corresponding to the maximum radio frequency used in the antenna device; and a controller that is connected to the probe, and controls the variable impedance matching circuit, based on an electrical signal measured with the probe.

Abstract: According to one embodiment, an antenna device includes a feeding portion, first and second wire-like metal portions, third and fourth plate-like metal portions and a fifth metal portion. One ends of the first and second wire-like metal portions are connected to the feeding portion. The third and fourth plate-like metal portions are respectively connected to the other ends of the first and second metal portions and disposed separately from each other with a predetermined distance therebetween. The fifth metal portion is configured to connect the third metal portion to the fourth metal portion. A total electrical length of the first to fifth metal portions is 3/2 wavelength at operating frequency band.

Abstract: An antenna device includes subarray antennas including antenna elements, feeding lines and feeding interfaces. At least one of the feeding lines includes a phase shifter which shifts phases of the signals feeding to corresponding antenna elements. The feeding lines feed signals to the antenna elements. Each feeding interface is connected to each of subarray antennas. The subarray antennas are arranged parallel to each other with an interval on a plane to be symmetrical about a central axis. The interval is less or equal than a free-space wavelength. The central axis is along with the center of two adjacent subarray antennas arranged at middle of the subarray antennas when the number of the subarray antennas is even. Moreover, the central axis is along with one subarray antenna arranged at the middle of the subarray antennas when the number of the subarray antennas is odd.

Abstract: According to one embodiment, a wireless power transmission apparatus includes a housing and a plurality of transmitting coils. The housing is capable of containing one or more power receiving apparatuses includes one or more receiving coils which receive power. The plurality of transmitting coils are provided inside the housing and are configured to transmit the power to the power receiving apparatuses by making electromagnetic coupling with the receiving coils, at least two of the plurality of transmitting coils having orientations of axes different from each other, the axes each indicating a line perpendicular to a plane which is defined by windings of a coil.

Abstract: This antenna includes: a ground conductor part; and a radiation conductor part that is disposed substantially parallel to and a predetermined distance apart from the ground conductor part and has a feeding point to which a high-frequency signal is fed, in which surface roughness of a predetermined region of at least one of the ground conductor part and the radiation conductor part is equal to or less than twice skin depth at an operating frequency.

Abstract: According to an embodiment, the first signal line is provided on the substrate and has one end connected to the communication unit. The coaxial line is provided by a surface side of the substrate and includes second and third signal lines. The third signal line is provided at an outside of the second signal line through a dielectric. One end of the second signal line is connected to the other end of the first signal line. One end of the third signal line is connected to the ground electrode though a via. The electrode unit includes a reference potential electrode and a signal electrode. The signal electrode is provided around the reference potential electrode with a space left in between. The reference potential electrode is connected to the other end of the third signal line whereas the signal electrode is connected to the other end of the second signal line.

Abstract: In one embodiment, a communication apparatus includes a substrate, an antenna disposed on the substrate, a first communication part transmitting or receiving a signal at a predetermined frequency via the antenna, a first conductor plate, a terminal disposed on the substrate and connected to the first conductor plate by a conductor line, a second communication part disposed on the substrate, connected electrically to the terminal, and communicating with a communication partner via the first conductor plate, and a second conductor plate connected electrically to the conductor line and having a length of substantially ¼ of the wavelength of the predetermined frequency.

Abstract: In one embodiment, a human body communication apparatus includes a first human body communication terminal carried by a person, a second human body communication terminal and an authentication unit included in the first or second human body communication terminal. The first human body communication terminal includes a first detection unit to detect first living body physiological information of the carrying person. The second human body communication terminal includes a human body contact sensor and a second detection unit to detect second living body physiological information of the person who touches the human body contact sensor. The authentication unit acquires the first and second living body physiological information and determines a correlation between the first and second living body physiological information to permit communication between the first and second human body communication terminals in accordance with the correlation.

Abstract: An antenna device includes an antenna substrate and a feed line substrate. The antenna substrate includes subarray antennas, feeding interfaces and a back surface. The subarray antennas are arranged parallel with an interval on a plane. Each subarray antenna includes antenna elements and first feed lines. The first feed lines feed signals from the feeding interface on back surface to the antenna elements. The feed line substrate is attached along back surface and includes second feed lines, first and second mode transformers. Each second feed line has one and other ends portions. Other end portion has wider width than one end portion. Each first mode transformer is located in one end portion and connected to the feeding interface. Each second mode transformer is located in other end portion. One end portions are arranged in a line with interval, and other end portions are alternately arranged across one end portions.

Abstract: According to one embodiment, a radio device includes: a mounting board having a conductive plane; a semiconductor package mounted on the mounting board and having a interposer having a conductive plane, a semiconductor chip mounted on one surface of the interposer, and an antenna having a conductive element formed on the one surface and connected to the semiconductor chip; and a plurality of connection portions connecting the mounting board and the interposer. A first electrical length of the first connection portion which is nearest the conductive element among the plurality of connection portions or a second electrical length of the first connection portion including a conductive plane of the mounting board or interposer connected to the first connection portion is less than ½ wavelength of the operating frequency of the antenna.

Abstract: According to one embodiment, an antenna device is provided with a dielectric substrate whose both surfaces are covered by first and second metal films, a via-hole row in which via-holes are arranged in two rows on the dielectric substrate, and a waveguide line is formed by the first and the second metal films, and a slot pair provided in the first metal film. The slot pair has a first slot and a second slot provided so that a slot length direction is oblique to a line direction of the waveguide line. A center of the first slot and a center of the second slot are spaced apart from each other by not less than a half of the shorter one of the slot length of the first slot and the slot length of the second slot along the slot length direction.

Abstract: A short slot directional coupler includes a dielectric substrate having both surfaces each covered by a metal film, a first via-hole string and a second via-hole string, each of which has via-holes penetrating through the substrate, and formed so that a distance between the first via-hole string and the second via-hole string is narrow at a center of a length direction of the string and wider along directions of both ends of the string, and a pair of third via-hole strings each having via-holes penetrating through the substrate, and formed between parts adjacent to both ends of the first via-hole string and parts adjacent to both ends of the second via-hole string to form a first post-wall waveguide along with the first via-hole string and a second post-wall waveguide along with the second via-hole string.