Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Toshiyuki Horie

Naofumi Yoneda

Moriyasu Miyazaki

Akio Iida

Izuru Naito

Yoji Aramaki

Hiroyuki Satoh

Hiroyuki Sato

Koji Yamanaka

Yukio Ikeda

Akira Tsumura

Yoshio Inasawa

Yoshihiko Konishi

Shinichi Yamamoto

Kazutomi Mori

Kenji Kusakabe

Shigeru Makino

Shuji Nuimura

Tetsu Ohwada

Hideyuki Oh-Hashi

Yutaka Ozaki

Yutaka Shimawaki

Izuru Naitoh

Yutaka Simawaki

Akira Tumura

Syuji Nuimura

Makio Tsuchiya

An antenna device including: a reflector antenna including a primary radiator, a feed waveguide for feeding radio waves to the primary radiator, and a reflector; and a radome that covers the reflector antenna, in which the antenna device further includes a sidelobe reduction member attached to a vicinity of the primary radiator or the feed waveguide, the sidelobe reduction member reducing a sidelobe in a specific direction of an antenna by at least one of scattering and absorbing of radio waves reflected by the radome out of the radio waves radiated from the reflector antenna. Therefore, it is possible to reduce a sidelobe deterioration caused by reflection waves from the radome.

Antenna device

A waveguide orthomode transducer includes a first radio wave conducting means for conducting an electric wave of a horizontally polarized wave branched by an electric wave branch means, for conducting another electric wave of the horizontally polarized wave, for combining the electric waves of the horizontally polarized wave into one electric wave and dividing this electric wave into an electric wave of a basic mode and an electric wave of a higher mode, and for outputting them, and a second radio wave conducting means for conducting one electric wave of a vertically polarized wave branched by the electric wave branch means, for conducting another electric wave of the vertically polarized wave, for combining the electric waves of the vertically polarized wave into one electric wave and dividing this electric wave into an electric wave of a basic mode and an electric wave of a higher mode, and for outputting them.

Waveguide orthomode transducer

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.

The present invention aims at providing a rotary joint which is of a thin type and has broad band characteristics and which is low in loss and is excellent in power resistance as well. In order to attain the object, the rotary joint includes: first and second polarizers each having a common side terminal connected to a waveguide portion, and two branch side terminals through which two polarized waves orthogonal to each other inputted through the common side terminal are separately taken out; and the waveguide portion which has a rotatable connection portion, one end of which is connected to the common side terminal of the first polarizer and the other end of which is connected to the common side terminal of the second polarizer.

Rotary joint

The present invention includes: a first main waveguide; a T-branch circuitconnected thereto; a first low-pass filterconnected thereto; a band-pass filterconnected to the first T-branch circuit; a first converterconnected to the first low-pass filterfor converting transmission lines between a waveguide and a microwave integrated circuit; an amplifierconnected to the first converter and structured by the microwave integrated circuit; a second converterconnected thereto for converting transmission lines between a waveguide and the microwave integrated circuit; a second low-pass filterconnected thereto; a second T-branch circuitconnected to the second low-pass filter and the band-pass filter; and a second main waveguideconnected to the second T-branch circuit.

High frequency module and antenna device

An object of the present invention is to obtain a waveguide type polarizer, which enables miniaturization thereof, shortening of an axis, and broad band promotion, and which has high performance. In order to attain the object, the waveguide type polarizer includes: a first rectangular main waveguide; first to fourth rectangular branching waveguidestobranching perpendicularly to the first rectangular main waveguide; a short-circuit plateconnected to one terminal of the first rectangular main waveguide; a metallic blockprovided on the short-circuit plate; a rectangular waveguide stepconnected to the other terminal of the first rectangular main waveguide; and a second rectangular main waveguideconnected to the rectangular waveguide step

Waveguide type ortho mode transducer

In order to lessen the deterioration of the VSWR, a plural-reflector antenna system is provided wherein an appropriately shaped vertex matching plate is disposed on the subreflector and electric waves that reenter the primary radiator are cancelled out. The electric waves radiated from the primary radiator are reflected by the subreflector and are radiated into space after being reflected by the main reflector. The passing area in the horn aperture, through which the reflected waves from the vertex matching plate pass, is made to be analogous to the aperture of the primary radiator, by defining the vertex matching plate as an ellipsoid, and by orienting its minor-axis direction in the major-axis direction of the main reflector and its major-axis direction, in the minor-axis direction of the main reflector.

Plural-reflector antenna system

Growing community of inventors

Tokyo, Japan

Toshiyuki Horie