| 摘要 |
<p>The present invention is a double-reflector microwave antenna (fig. 1), which can be classified as belonging to the Gregorian optics family, capable to provide an elliptical beam with a major axis which can be oriented in any required direction of space (fig. 2), through the simple rotation of sub-reflector (2) around axis (4 of fig. 1). By adding a further degree of freedom, that is, an independent translation of the same sub-reflector (2) and/or of main reflector (3) along axes (5) and/or (6), it is possible to obtain a considerable degree of reconfigurability of the shape of the beam. In particular, it is possible to widen the axes of the beam, to vary the ratio between the axes of the elliptical beam for any orientation of the major axis, or to obtain a circular beam (figs. 3a and 3b). These characteristics are such as to make the present invention suitable for use as antenna on board satellites with frequency re-use in an operational environment with one or more simultaneously active beams. The invention may be classified as belonging to the technical field of microwave antennas and to the application field of reconfigurable antennas for use on board satellites or space stations or in ground-based radar systems.</p> |
