摘要:
L'antenne à réflecteur à flexibilité de couverture et de fréquence comportant un réflecteur retournable (10) ayant deux surfaces réfléchissantes (R1, R2) distinctes formées géométriquement de façon à couvrir respectivement une première et une deuxième zones géographiques différentes et de formes prédéterminées, est caractérisée en ce que les deux surfaces réfléchissantes (R1, R2) sont fixées dos à dos sur un support commun et en ce que l'antenne comporte en outre au moins deux sources indépendantes (S1, S2) disposées dans une configuration fixe et reliées à des chaînes d'alimentation radiofréquence distinctes (2, 3) définissant des plans de fréquence de fonctionnement (F1, F2) différents et prédéfini, le réflecteur (10) comportant une première position de déploiement selon laquelle le foyer de la première surface réfléchissante (R1) est placé au centre de phase (5) de la première source (S1) et une deuxième position de déploiement selon laquelle le foyer de la deuxième surface réfléchissante (R2) est placé au centre de phase de la deuxième source (S2). Application notamment au domaine des antennes de télécommunication par satellite.
摘要:
Dual reflector offset mechanical pointing low profile telecommunication antenna, to be used above all on vehicles, even high-speed ones. Its reduced physical dimensions facilitate its use, with respect to the known solutions, as it allows its connecting to the receiving system, such as a satellite, though installed on a train or on an aircraft. The invention lies within the technical field of telecommunications and the applicative field of stationary, movable antennas of reduced dimensions, and accordingly within that of telecommunications in general. The original dual reflector antenna is obtained from a second-order polynomial that configurates it in the Cartesian space XYZ.
摘要:
Disclosed herein is an antenna beam control apparatus for steering a horizontal azimuth angle or horizontal beam width of base transceiver station antennas. The apparatus comprises at least one antenna reflection plate, rotation means for rotating the antenna reflection plate, plural driving means for driving the rotation means, driving control means for controlling the driving means according to external control signals, and a radome containing the antenna reflection plate and all the above means therein.
摘要:
Square waveguides (9a, 10a) and square waveguides (9b, 10b) are symmetrically formed and a waveguide type polarizer (13) is installed below the level of a waveguide type polarizer (8). This provides an effect which enables installation stability to be enhanced with reduced device height without impairing electric characteristics. In addition, the symmetrical arrangement ensures superior weight balance and mechanically stabilized performance.
摘要:
A reflector antenna comprising a Cassegrain reflector, and a mechanism for turning the reflector about the azimuth axis and the elevation axis so that it can be installed in a limited space while exhibiting a sufficient practicality and can perform scanning by turning about two axes perpendicular to each other. The reflector of substantially rectangular aperture is subjected to figuring such that the elevation angle thereof passes through the substantially central part of the height dimension of the reflector and the supplied electromagnetic wave is received substantially entirely and reflected and thereby the antenna height does not increase even when the reflector turns about the elevation axis. The reflector may comprises an array of a plurality of reflector elements.
摘要:
A reflecting mirror support structure comprising at least one reflecting mirror panel, a support base block for finally supporting the reflecting mirror panel, and at least one reflecting mirror support member. The reflecting mirror support member has a branching shape comprising a base attached to the support base block, and a plurality of blanches attached to the reflecting mirror panel.
摘要:
This disclosure provides a communication system using a high-altitude aircraft traveling at relatively slow speeds, which can remain airborne for long periods of time. The communication system uses the airplane as a long term high altitude platform that relays signals between one or more ground-stations and/or satellites, aircraft, and the like. The ground-stations have narrow-beam antennas that are aimable, permitting the aircraft to maintain a larger station than would otherwise be possible using the narrow-beam antennas. The ground-stations adjust their aim based on information either gained by tracking the aircraft's signal, or transmitted by the aircraft to the ground-station.
摘要:
The invention comprises a milli-wave radar system (11) for obtaining first target position information of a flying object (21) by capturing and tracking the flying object from a maximum detection distance, a stereo-camera system (12) for taking over the tracking of the flying object (21) in the vicinity of a landing point by acquiring the first target position information of the flying object from the milli-wave radar system (11), and obtaining second target position information having higher precision than the first target position information, and a controller (13) for managing the first target position information of the milli-wave radar system (11) and the second target position information of the stereo-camera system (12), controlling the milli-wave radar system (11) to capture and track the flying object (21) to the vicinity of the landing point, and controlling the stereo-camera system (12) to capture and track the flying object (21) at the time of landing of the flying object.