Abstract: Offset angle is taken as a variable to analyzethe far-field performance of offset parabolic antenna, surface current methodis used to calculate the far-field patterns, half power circles and cross-polar level etc.. Several cases with different offset angle are computed and analyzed.Little change is shown in the far-field performance when offset angle changedin E-plane, and apparent change is seen in H-plane.

Key words: offset parabolic antennas, offset angle, cross-polar level