Cassegrain aerial for very short wavelengths - has horn exciter with circular cross:section and ring: shaped ribs one quarter wavelength deep

摘要

The cassegrain aerial rotates around a central axis and receives very short wavelengths. It consists of a main reflector (1) and a reflector (2) fed via a supply waveguide (3). There is also a sub-reflector (4) in the short range field of the exciter, which is a horn of circular section, a few wavelengths wide. The symmetry of the horn field on the internal surface of the horn is achieved by ring-shaped ribs with a depth which is approximately one quarter wave length. Dielectric layers are used for padding. A smooth wave front is obtained in the horn aperture by means of a lens.