ANTENNESYSTEM

An MLS system having redundant subsystems. Dual signal sources (10, 20) feed dual power dividers (40, 70). A first switch array (90) selects the power divider to be used and provides the selected signals to an array of phase shifters (120). A second switch array (170) provides the phase shifted signal, which may be amplified, to either a primary array (190) having elements for radiating a scanning beam or a recombining network (200) having outputs connected to auxiliary antennas (210). A third switch array (131) provides control signals to the array of phase shifters from either a main beam steering unit (130) or a standby beam steering unit (140). Alternatively, the dual signal sources feed a single power divider through a circulator. Duplicate auxiliary antennas may be used with antenna switches located before the power dividers or circulator for selectively providing the signals to the auxiliary antennas instead of the primary array.