| 摘要 |
<p>A shaped beam antenna of the type comprising a main reflector (30) and a feed horn (20) for irradiating an electromagnetic wave upon said main reflector (30), the main reflector (30) including, in sectional planes inclusive of a Y - Z plane and planes parallel thereto, a central section and horizontal side end sections adjoining the central section, where Cartesian coordinates are assumed having an origin near the feed horn (20), a Z-axis extending in a direction of the horizontal center axis of the feed horn (20), and X- and Y-axes extending in planes perpendicular to the Z-axis. The central section has a plurality of torus reflector segments (34, 37, 38) and each of the side end sections has a plurality of parabolic reflector segments (35-1, 36-1, 39-1, 35-2, 36-2, 39-2), and the torus and parabolic reflector segments are grouped into first and second portions, the first portion having the reflector segments (34, 35-1, 35-2) which are symmetrical with respect to the Y-Z plane, the second portion having first and second sub-portions, the reflector segments (37, 36-1, 36-2, 38, 39-1, 39-2) of the first and second sub-portions being asymmetrical with respect to the Y-Z plane, whereby the maximum radiation direction of the beam reflected from the first portion lies in the Y-Z plane, and the maximum radiation direction of the beam reflected from the second portion lies in planes other than the Y-Z plane.</p> |
