Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Hiroaki Miyashita

Toru Fukasawa

Satoshi Yamaguchi

Takashi Ito

Tomohiro Mizuno

Takashi Itoh

Masataka Otsuka

Yasuhiro Nishioka

Takuro Sasaki

Hirokatsu Okegawa

Kazushi Nishizawa

Takashi Katagi

Yoshihiko Konishi

Takashi Yanagi

Makoto Matsunaga

Yukihiro Tahara

Narihiro Nakamoto

Tetsuo Haruyama

Yoshiyuki Chatani

Tooru Takahashi

Izuru Naitou

Hideyuki Oohashi

Toshio Masujima

Yoshihiko Imai

Nobuyasu Takemura

Hiroyuki Aoki

Takayoshi Furuno

Kazuhito Miyashita

Yasuhiro Itabashi

Toru Fukusawa

Included are: a waveguide in which multiple probe inserting holes are provided in a first wall surface, and multiple connection shaft inserting holes are provided in a second wall surface; multiple feed probes each of which is inserted in one of the probe inserting holes, and to a first end of each of which one of multiple circularly polarized element antennas is connected; multiple connection shafts each of which is inserted in one of the connection shaft inserting holes, and a third end of each of which is connected to a second end of one of the feed probes; multiple rotation shafts, a fifth end of each of which is connected to a fourth end of one of the connection shafts; multiple rotation devices each of which rotates one of the rotation shafts; and a control device that individually controls rotation of the rotation devices.

Array antenna device

A partial discharge sensor evaluation method includes a first frequency characteristic measuring process in which, in a state where a reference antennafor which a frequency characteristic in an effective height is known and a measuring antennaare installed on a flat groundto be separated by a predetermined distance from each other, a transmission characteristic measurermeasures a frequency characteristic of a transmission characteristic between the reference antennaand the measuring antenna, and a second frequency characteristic measuring process in which, in a state where a measured antennais installed inside a cylindrical groundburied in a circular openingformed at a position where the reference antennahas been installed, the transmission characteristic measurermeasures the frequency characteristic of the transmission characteristic between the measured antennaand the measuring antenna

Partial discharge sensor evaluation method and partial discharge sensor evaluation device apparatus

A partial discharge sensor includes: a first ground () that constitutes a closed space () to surround a high-voltage wire (); and a cylindrical branch pipe () disposed at the first ground () to protrude to an outer space to house with a lid () a first metal container () having at least one hole through which gas can pass, and having a slit () formed on the side to the space (); at one end of a coaxial wire () disposed in the container (), an outer conductor () of the coaxial wire () is connected to the first metal container () at a portion near the center of the slit (), and an inner conductor () of the coaxial wire () is connected to the first metal container () at an opposite portion to a position where the outer conductor () is connected across the slit ().

Partial discharge sensor

A partial discharge sensor is configured to have a metal casingdisposed outside flangeandand a bowtie antennadisposed inside the metal casingin a direction orthogonal to a circumferential direction of the flangesandto thus receive a signal caused by a partial discharge over a wide band with high sensitivity.

A partial discharge sensor includes a top-loading monopole antenna including a disc and a post to be installed even in a branch pipe with a small diameter such that a length between the disc and a structure is adjusted to set thereto a frequency band to be detected.

A wireless communication device whose impedance can be matched with an arbitrary load impedance and that can be broadened in operating frequency band even when choosing an input impedance of an IC chip freely is not possible. The wireless communication device includes: a first conductor; a second conductor disposed substantially parallel to the first conductor; a hole formed in the second conductor; a capacitive coupling mechanism disposed adjacent to the hole; and a communication circuit which has at least one of a radio wave transmitting function and a radio wave receiving function. The communication circuit is connected through the capacitive coupling mechanism to two sites on the second conductor that are near borders between the second conductor and the hole.

Wireless communication device

Provided is a waveguide slot array antenna apparatus having a polarized wave plane in a direction oblique to a tube shaft of a waveguide, in which an excitation distribution of opening portions for radiating or receiving electromagnetic waves is appropriately attained. The waveguide slot array antenna apparatus includes a waveguide slot array antenna formed of a rectangular antenna waveguide which has a rectangular section orthogonal to a tube axis, in which: the rectangular antenna waveguide has one end side thereof in a tube axial direction serving as a feeding port and another end side short-circuited; the antenna waveguide has a plurality of slender rectangular opening portions for radiating or receiving an electromagnetic wave arranged at intervals of about &#x3bb;g/2 (&#x3bb;g is an intra-tube wavelength) along the tube axis on a first wide plane of a pair of wide planes that are parallel to the tube axis; the plurality of slender rectangular opening portions each have the same predetermined angle with respect to a center line parallel to the tube axis of the first wide plane; the opening portions adjacent to one another are alternately arranged at opposite positions with respect to the center line; the opening portions located on one side with respect to the center line of the first wide plane each have a length longer than about &#x3bb;f/2 (&#x3bb;f is a free space wavelength), and the opening portions located on another side each have a length shorter than about &#x3bb;f/2.

Waveguide slot array antenna apparatus

A radio communication device is obtained which is provided with an RFID tag function which can ensure the mounting area of each antenna as large as possible, and which is sharable with an LF band RFID system or an HF band RFID system and a UHF band RFID system, while having a communication range equivalent to the communication range of each of an LF band an HF band and a UHF band. The device is provided with an integrated circuit () having a communication function in a first frequency band, a conductive object () connected to one of input and output terminals of the integrated circuit (), an integrated circuit () having a communication function in a second frequency band, and a second conductive object connected between input and output terminals of the integrated circuit (). The second conductive object is composed of a spiral conductive object (). The other of the input output terminals of the integrated circuit () is connected to a part of the spirally wound conductive object ().

Radio communication equipment

A planar antenna including slot arrays configured to set a narrow interval between elements so as to perform beam scanning in a wide angle range while keeping low loss and low profile. The planar antenna includes: a coaxial line including an inner conductor, an outer conductor provided so as to surround a circumference of the inner conductor, and both ends short-circuited; a feeding mechanism for exciting the coaxial line; and a plurality of slots formed on the outer conductor with a certain angle with respect to a tube direction of the coaxial line and having approximately a resonance length.

Coaxial line slot array antenna and method for manufacturing the same

A variable power distributor capable of calculating an error between transmission lines of two systems after building a variable power distributor and correcting the set value of the amplitude and the phase according to the error, an error detection method for the variable power distributor, and a set value correction method is provided. The variable power distributor includes: a two-way distributor provided on an input side of a set of transmission lines consisting of a first and a second transmission line; a 90-degree hybrid circuit provided on an output side of the set of transmission lines; and a variable phase shifter, variable resistance attenuator, and a power amplifier provided on each line of the set of transmission lines between the two-way distributor and the 90-degree hybrid circuit. The variable power distributor further includes an error detection unit that monitors an output signal from the 90-degree hybrid circuit and detects an error existing in each component between the first and the second transmission lines based on the monitor output.

Variable power distributor, error detection method thereof, and set value correction method

An antenna apparatus comprises a dielectric substrate, an earth conductor mounted on one surface of the substrate and forming a microstrip transmission line, an upper conductor mounted on the other surface of the substrate and forming a microstrip transmission line, an antenna element formed integrally with the microstrip transmission lines, and a delayed wave opening situated in the earth conductor in confronting relationship with the upper conductor.

Growing community of inventors

Tokyo, Japan

Hiroaki Miyashita