Dielectric Feeds for Reflector Antennas

Special dielectric antennas used as elements for a feed of multi-beam or limited-scan reflector antennas have been developed. As a result of the close arrangement of the feed elements, their cross-sectional dimensions must be small and their mutual coupling should be as low as possible. On the other hand, the individual elements must produce a desired reflector illumination. The design and the radiation characteristics of the dielectric antennas developed are discussed in detail. Furthermore, a report is given on theoretical and experimental investigations, which were performed to obtain a low VSWR of these antennas in a wide frequency band.