Abstract
ABSTRACT The offset dual parabolic cylindrical reflectors are analyzed. They generally produce elliptical beam patterns with unequal beamwidths in the two principal planes. The dependence of the principal plane beamwidths, the peak cross-polarization level, the antenna gain and the first sidelobe level on the antenna geometrical parameters, and in particular the offset angle, is studied. The main effect of the offset angle is increasing the cross-polarization level. However, for any offset configuration, the angle between the two reflectors has a strong effect on the cross-polarization. Optimizing this angle, the peak cross-polarization may become negligibly small, and as low as -60dB. A design procedure for such an offset configuration is provided and a design example Is given.
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