A circularly-polarised aerial for satellite reception

摘要

A circularly-polarised feed aerial for a 2-44m parabolic reflector was designed and constructed to form the basis of a satellite receiving station. Waveguide components and a hybrid-mode scalar-horn aerial were used, with a facility for the reception of either sense of polarisation. The cross-polar isolation was found to be 30 dB, and with a 2-44 metre parabolic reflector the aerial gain was estimated to be 40 dB, the efficiency approaching 70%.