Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Sotaro Shinkai

Masahiko Nagoshi

Wataru Noguchi

Akihiko Shiotsuki

Hiroyuki Yurugi

Osamu Tanaka

Nobuhiko Arashin

Toyoshi Yamada

Takeshi Ohno

Koichiro Tanaka

Kazuki Hashimoto

Hiroshi Ohue

Hideyuki Yamada

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.

Wireless device, management device, and antenna direction determination method

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.

Antenna apparatus less susceptible to surrounding conductors and dielectrics

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 &#x215b; of a wavelength &#x3bb; 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.

Antenna apparatus including dipole antenna and parasitic element arrays for forming pseudo-slot openings

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

Wireless communications apparatus and wireless communications method

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.

Array antenna apparatus including multiple steerable antennas and capable of eliminating influence of surrounding metal components

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 &#x3bb; in communication.

Antenna apparatus including feeding elements and parasitic elements activated as reflectors

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.

Variable directivity antenna apparatus provided with antenna elements and at least one parasitic element connected to ground via controlled switch

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.

Directional pattern determining method capable of quickly selecting optimum directional pattern

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

Wireless communication system having MIMO communication capability and having multiple receiving antennas to be selected

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.

Growing community of inventors

Osaka, Japan

Sotaro Shinkai