Nippon Steel Corporation

System Uniques Corporation

Other

Mikuni Corporation

Systems Uniques Corporation

Takashi Ojima

Masahiro Uematsu

Nobuharu Takahashi

Kazuo Kato

Makoto Ochiai

Yutaka Arai

Naohisa Goto

Makoto Ando

Jiro Hirokawa

Atsushi Kaise

Motonobu Moriya

Hiroaki Kawaguchi

Seiji Koyama

Yoshikazu Takahashi

A slotted leaky waveguide array antenna comprises a flat, thin bottom plate made of a metallic material; a flat, thin slotted plate made of a metallic material, and disposed parallel with the bottom plate at a predetermined distance from the bottom plate to form a space between the slotted plate and the bottom plate, the slotted plate being formed with a plurality of slots arranged in substantially parallel rows extending in a predetermined guide axial direction; a plurality of flat, thin side walls made of a metallic material and arranged in the space so as to partition the space between the bottom plate and the slotted plate into a plurality of waveguides communicating with each other and including radiation waveguides extending in parallel in the guide axial direction, a lower surface of each of the side walls being fixed to the bottom plate and an upper surface thereof being fixed to the slotted plate; and an electrically conductive adhesive agent layer between the upper surface of each of the side walls and the slotted plate for fixing them to each other.

Slotted leaky waveguide array antenna and a method of manufacturing the

An antenna housing functions as a radome for a satellite antenna device for mounting on a moving body. The housing includes a lower portion on which the antenna device, having an antenna body and an automatic tracking mechanism, is fixedly mounted and an upper portion releasably connected to the lower portion in a watertight manner. The upper portion is made of a dielectric material and composed of a single layer of a resin having a relative dielectric constant of no more than 2. The upper portion is spaced from a surface of the antenna body by a distance except for values close to an integral multiple of a half-wave length.

Housing for antenna device

A slotted leaky waveguide array antenna of a one-axis tracking type wherein a feed section including a feed probe is kept in a stationary state to thereby keep a converter in a stationary state and a desired beam width is set in a tilt direction, includes a plurality of radiation waveguides arranged adjacent and parallel to each other, each of which has a plurality of slots arranged in a waveguide axial direction, and a feed waveguide for distributing to the respective radiation waveguides electromagnetic waves received through a feed section from a converter, and the antenna rotates in a substantially horizontal plane to track an azimuth direction, wherein the feed waveguide has a first section extended along one ends of the radiation waveguides and a second section extended from the feed section provided in the rotary center of the slotted leaky waveguide array antenna to the center of the first section, and wherein the radiation waveguides are formed with crossed slots having an identical offset, and the number of the crossed slots is preferably selected between 13 and 17.

Slotted leaky waveguide array antenna

This plane array antenna for receiving satellite broadcasts is an optimal combination of the plane array antenna main body having a tilt angle, a converter connected with the antenna main body through the power supply portion, and the rotation mechanism for rotating the antenna main body within almost a horizontal plane for tracking the azimuthal angle direction. The plane array antenna main body has the power supply portion formed at the center of the rotation and the converter includes a dielectric substrate having a microstrip channel formed on the substrate and a casing accommodating the substrate. The converter is fixed downwardly of the antenna main body and supports the antenna main body. The power supply portion includes the power supply probe with an insulation covering, and has its front end portion inserted into a space formed with the antenna body, a central portion extending through the casing of the converter, and the lowest end portion combined with the microstrip channel. The rotation mechanism includes a cylindrical body projecting downwardly from the bottom surface of the antenna main body at the outside of the converter and a driving mechanism for rotating the cylindrical body.

Plane array antenna for receiving satellite broadcasting

A non-contact rotating coupler for transmitting a signal through coupling capacitances formed between opposite coupling plates arranged apart from each other. In the coupling plate, an inductance for causing a parallel resonance in a signal frequency band with a stray capacity existing between a grounded conductor and a non-grounded conductor is connected between a junction point of a resistor and a capacitor and the grounded conductor or between the non-grounded conductor and the grounded conductor, thereby reducing a coupling loss.

Non-contact rotating coupler

A receiving antenna apparatus for receiving broadcast by satellite and adapted for mounting on a mobile body in which radio wave interruption tends to occur by obstacles, attains high-speed automatic tracking function capable of catching the satellite again in a short time just after cutting off of radio waves. In the receiving antenna apparatus, an incoming direction of radio waves is roughly detected to limit a search area and then a gain of the tuners is reduced to a value in the tracking control capable of detecting a peak and confirming a main lobe in accordance with power level of the received signal, so that a narrow and fine search may be made only in the limited search area. The antenna apparatus includes a gain setting device for varying gains of AGC of the tuners. Upon searching for the satellite, gains of the tuners are set to a first gain by the gain setting device to perform the rough search and the gains of the tuners are reduced to a second gain level lower than the first gain to perform the fine search. Thus, a time required to catch the satellite after cutting off of radio waves can be reduced.

Receiving antenna apparatus for broadcast by satellite

A satellite broadcast receiving antenna apparatus having an automatic tracking function for mobile bodies subject to radio wave interference due to obstacles is disclosed, in which phase correction circuits are arranged in the stage before a phase difference detection circuit, and the amount of phase shift of the phase correction circuits is adjusted by a CPU in such a manner that the peaks of the received signals are coincident in phase with each other at the time of detection thereof. The amount of phase shift associated with the coincidence is stored in a phase shift amount memory, and phase correction is effected on the amount of phase shift read from the memory is subsequent automatic tracking.

Growing community of inventors

Tokyo, Japan

Takashi Ojima