Design and Analysis of Parabolic Reflector with High Gain Pencil Beam and Low side lobes by Varying feed

The far field radiation pattern from a parabolic reflector depends on the primary radiation pattern which is the radiation pattern of the feed element placed and also on the type and dimensions of reflector used. Therefore in this paper first analysis of the primary patterns of different elements like dipole, horn is done by considering different dimensions. In addition the beam efficiency and the dipole multiplication patterns for different lengths were also calculated. A parabolic reflector has been selected as the reflector because it produces high gain pencil beam with low side lobes. Using general and aperture approximation methods the radiation patterns have been plotted in both the azimuth and elevation planes. The comparison of dipole, square corner and horn feeds based on the characteristics like intensity, directivity has also been done and the resultant patterns were obtained.