An efficient computer program for the analysis of dual-shaped-reflector antennas is described. This is used to predict the crosspolarisation of a typical earth station antenna. Employing a feed with intrinsic crosspolarisation, it is shown that the crosspolar performance of the antenna may be reflector depolarisation limited. The effect of subreflector beam steering on the crosspolar response is also discussed. © 1978, The Institution of Electrical Engineers. All rights reserved.
Bird, TS, Boomars, JL & Clarricoats, PJB 1978, 'Multiple-beam dual-offset reflector antenna with an array feed', Electronics Letters, vol. 14, no. 14, pp. 439-441.
View/Download from: Publisher's site
A computer simulation is described for the production of multiple beams by a dual-offset reflector antenna with a feed consisting of a circular waveguide array. It is shown that acceptable efficiencies and low crosspolar levels can be achieved for two sample beams of a multibeam configuration by deriving the array excitation from the focal-region fields of the double-offset antenna. © 1978, The Institution of Electrical Engineers. All rights reserved.