| 摘要 |
<p>An improved subreflector antenna with lower sidelobes than the prior art subreflector antenna is disclosed herein. A tapered, anisotropic, corrugated subreflector (11) is attached to a waveguide (3) and located at the focus of a near-parabolic deep dish main reflector (9). The subreflector (11) has corrugations of varying depth. The varying depths of the corrugations result in varying reactance, or reactance taper, of the subreflector (11). This taper is designed in such a manner to guide or steer the energy from the antenna feed to the main reflector in such a manner as to help assure sharply reduced sidelobes. Further, the subreflector (11) is physically shaped so as to further steer or guide the energy in the desired direction. The deep geometry of the main reflector (9) allows the reduced sized subreflector (11) to be positioned within the rim of the main reflector (9) such that the combination can be covered by a flat radome.</p> |
