| 摘要 |
<p>An antenna suited for receiving/transmitting electromagnetic signals from/to at least two satellites, which are fixedly placed at points on the geostationary path, is waveguide or lens type, formed by a multitude of waveguiding channels (7), which for example can be rotationally symmetrically arranged about an axis (5). Signals from remote points, which arrive in directions somewhat deviating from the direction of the axis (5), e.g. in an angle αin thereto, exit after being refracted in the antenna in a different direction, so that the angle αut on the exit side differs from the angle αin on the entrance side. It is achieved by having all of the waveguiding channels (7) form suitably adapted angles to the axis (5). For a concave antenna it can give an increased separation between the positions, to which signals from remote objects are refracted by the antenna. It results in that for example large, more efficient receiver horns can be used for the same size of the antenna.</p> |
