Abstract
Gain degradation of a modular antenna due to module rotation, offset errors and curvature errors of a module is studied. Effects of these errors can be almost compensated in a single antenna by focus alignment adjusting mechanism, because they are low-order deformations. In order to investigate the effects of these errors, numerical simulations are carried out. The results clearly indicate that these errors cause antenna gain degradation of a modular antenna and they cannot be compensated.
