Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

National Space Development Agency of Japan

Yoshihiko Konishi

Masataka Ohtsuka

Shuji Urasaki

Makoto Matsunaga

Yoshio Inasawa

Shigeru Makino

Naofumi Yoneda

Moriyasu Miyazaki

Takashi Katagi

Izumi Mikami

Izuru Naito

Kazuyuki Takada

Shintaro Nakahara

Akinori Taira

Ryoji Hayashi

Noriharu Suematsu

Masataka Otsuka

Isamu Chiba

Yasushi Sogabe

Akio Iida

Yoji Isota

Toshihisa Kamemaru

Izuru Naitoh

Kouji Tsutsumi

Toru Takahashi

Hiroyuki Satoh

Hidetaka Yamauchi

Tsuyoshi Ozaki

Shinichi Yamamoto

Kenji Kusakabe

Hiroaki Miyashita

Tamotsu Nishino

Tsutomu Endo

Toshiyuki Horie

Tomoaki Fukushima

Yoshiyuki Chatani

Izuru Naitou

Kazushi Nishizawa

Yutaka Shimawaki

Ichiro Shirokawa

Yoshihiko Imai

Nobuyasu Takemura

Shin-ichi Satoh

Shigenori Kabashima

Shinji Kuroda

Akio Iso

Toneo Kawanishi

Yasuo Tamai

When transmitting an RF signal for power supply or a pulse signal for data transmission, amplification is made in such a manner that the peak power of the RF signal becomes greater than the peak power of the pulse signal. Thus transmitting the RF signal with the greater peak power enables charging of a capacitorof noncontact wireless communication equipmenteven if the distance to the noncontact wireless communication equipmentis long.

Power supply apparatus and power supply method

A beam forming apparatus of a satellite is configured to: define a perimeter of a coverage area, and define a coordinate grid of a polar coordinate system so as to divide the coverage area into a plurality of small areas; calculate coordinates of borders between basic cells in a Cartesian coordinate system, the basic cells being shaped into regular hexagons arranged to be in contact with one another along their sides and at their vertices or into circles circumscribing the regular hexagons; define a plurality of new cells by converting, through coordinate transformation, the coordinates of the borders between the basic cells in the Cartesian coordinate system into coordinates of borders in the polar coordinate system; and set amplitudes and phases to the plurality of antenna devices that are suitable to form a plurality of beams in respective directions of the plurality of new cells.

Satellite communication system and method for dividing the coverage area thereof

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 in which a combination of rectangular waveguidesandand a combination of rectangular waveguidesandare disposed bilateral symmetrically to each other, and a waveguide orthomode transduceris disposed above a waveguide orthomode transduceris provided. Therefore, the profile of the antenna apparatus can be reduced and the stability of installation of the antenna apparatus can be improved without impairing the electric characteristics of the antenna apparatus. Since the antenna apparatus has a bilateral symmetric structure, it excels in weight balance and offers stable performance from the viewpoint of mechanism.

Antenna device

A reflector antenna device includes: an auxiliary reflectorthat receives an electric wave radiated from an opening portion by a primary radiatorand reflects the electric wave; and a main reflectorthat receives the electric wave that is reflected by the auxiliary reflectorand radiates the electric wave to a space. In the reflector antenna device, the configurations of the auxiliary reflectorand the main reflectorare designed such that an electric power in an area of the main reflectorwhere the auxiliary reflectoris projected on the main reflectorin parallel with the radiating direction of the electric wave due to the main reflectoris equalor lower than a predetermined first threshold value, and a radiation pattern of the antenna which is determined by the area of the main reflectorother than the area has a desired characteristic.

Reflector antenna

For the purpose of obtaining a mechanical drive reflecting mirror antenna device which is downsized and low in attitude, enables wide-angle scanning, and is high in performance, there are provided a main reflection mirror, a sub-reflection mirror, a primary radiator, a first circular waveguidewhich is connected to the primary radiator and has a plurality of bend portions, a first circular waveguide rotary jointwhich is connected to the first circular waveguide, a second circular waveguidewhich is connected to the first circular waveguide rotary joint and has a plurality of bend portions, and a second circular waveguide rotary jointwhich is connected to the second circular waveguide and is different in a direction of a rotary axis from the first circular waveguide rotary joint by substantially 90 degrees.

Antenna device for conducting two-axial scanning of an azimuth and elevation

In order to provide a reflector antenna apparatus which can be installed within a small space, which has adequate practicality, and which can perform scanning by pivoting about two axes which are perpendicular to each other, in a reflector antenna apparatus having a Cassegrain reflector and a rotating mechanism which rotates the reflector about an azimuth axis and an elevation axis, a reflector with a substantially rectangular aperture has its elevation axis passing through substantially the central portion of the height dimension of the reflector, and reflector surface adjustment is carried out such that substantially all of the electromagnetic waves which are supplied are received and reflected, whereby the antenna height does not become large when the reflector rotates about the elevation axis. The reflector may be an array of a plurality of reflector elements.

An AC power source applies power to a primary coil that is provided in a fixed part. An AC current flowing through the primary coil induces electromotive force in a secondary coil that is provided in a movable part. The AC electromotive force induced in the secondary coil is converted by an AC/DC converter into DC power, which is input to a drive control section.

Antenna apparatus and waveguide rotary coupler

A space photovoltaic power generation system including a plurality of power satellites arranged in space, each of which converts electrical energy, into which sunlight has been photoelectric-converted, into a microwave, and transmits the microwave to an electric power base. The space photovoltaic power generation system divides the plurality of power satellites into a number of power satellite groups and adjusts the amount of phase adjustment to be made to a microwave which each of the plurality of power satellites included in each power satellite group will transmit so that a plurality of microwaves from the plurality of power satellites included in each power satellite group are in phase with one another. The beamwidth of the plurality of microwaves can be reduced without increasing the area of the aperture of a transmission antenna of each of the plurality of power satellites. If the plurality of microwaves transmitted from the plurality of power satellites included in each power satellite group interfere with microwaves transmitted from any other power satellite group, the beamwidth is reduced. To avoid the reduction in the beamwidth, each of the plurality of power satellites included in each power satellite group modulates the phase-adjusted microwave so as to generate an incoherent microwave so that the microwave does not interfere with other microwaves transmitted from any other power satellite group.

Space photovoltaic power generation method and system

A space photovoltaic generation system including a plurality of power satellites arranged in space, each of which converts electrical energy, into which sunlight has been photoelectric-converted, into a microwave, and transmits the microwave to an electric power base. The system can thus transmit a microwave of high power to the electric power base. Each of the plurality of power satellites modulates the generated microwave so as to generate an incoherent microwave before transmitting it to the electric power base, thus reducing the power density of the electric power transmitted to the electric power base on the earth and hence a loss in the total amount of energy transmitted to the electrical power base on the earth.

Space photovoltaic power generation system, power satellite, and electric power base

A method of and a system for receiving microwave beams from a plurality of power satellites ( ) in space by way of a receiving antenna ( ). By controlling the directions of a plurality of microwave beams to be transmitted from the plurality of power satellites, the plurality of power satellites ( ) direct the plurality of microwave beams into an aperture surface of the receiving antenna ( ), respectively, so that the plurality of microwave beams can be dispersively received at a number of different positions on the aperture surface of the receiving antenna ( ), so as to level the energy distribution of the microwaves received on the aperture surface of the receiving antenna ( ).

Method of and system for receiving microwave

A composite antenna apparatus comprising a balun connected to an inner conductor at the upper end of a coaxial line,, one end of a helical element formed by a pair of wire conductors is connected to the balun, the other end is wound symmetrically around the coaxial line using the the coaxial line as a center so as to face the balun and is connected to the outer conductor,at the lower end of the coaxial line. The provision of an outer conductor connecting terminal connected to the outer conductor and an inner conductor connecting terminal connected to the inner conductor at the lower end of the coaxial line, allows the formation, on the same axis, of a helical antenna fed by the coaxial line via the helical element and a monopole antenna formed by the outer conductor of the coaxial line. Thereby equivalent gain in the horizontal plane and a reduction in the occupied volume is achieved.

Composite antenna apparatus

A flat antenna device is constructed such that circular patches are provided on one surface of a dielectric film, a metallic grounding conductor film is fitted to one surface of a dielectric film, a dielectric member is sandwiched between the dielectric film and the dielectric film, and an extending mechanism is provided to the periphery of the device so as to maintain the dielectric film and the dielectric film in a fully extended state. A circular microstrip patch antenna is formed by the metallic grounding conductor film and each of the circular patches.

Light-weight flat antenna device tolerant of temperature variation

A mobile satellite communication system including an artificial satellite which is situated in a satellite orbit and develops an active phased array antenna so as to accomplish a line to a terrestrial station using a portable terminal in a specific area. As a result, a service that satisfies a demand for communication in the specific area can be realized.

Mobile satellite communication system

Growing community of inventors

Tokyo, Japan

Yoshihiko Konishi