Abstract: A system is provided that enables real time active phase control at higher RF signal power levels to be achieved by compensation for phase variations due to daily and lifetime fluctuation of equipment temperature, equipment aging effects and path length changes due to redundancy reconfiguration among others. This automated approach achieves the fastest and most accurate phase correction for efficient signal recombining. The system employs an RF signal which is split into parallel paths whose phase is adjusted employing the output of a feedback device and then amplified and sensed to provide the feedback signal and ultimately recombined.

Abstract: An antenna system has a reflector illuminated by a primary feed for producing a primary beam. The reflector is illuminated further by a secondary feed formed of an array of secondary feed elements of which the respective electromagnetic signals are adjustable in terms of their relative amplitudes and phases to produce a secondary beam with sidelobes oriented in directions away from the directions of the primary beam. Spacing among feed elements of the secondary feed array is selected for further control of orientation of sidelobes of the secondary beam. Highest efficiency is attained for signals of the primary feed by configuring the reflector for forming the primary beam, while the secondary beam is produced with lower efficiency but with isolation from the primary beam. The surface of the reflector is contoured to provide maximum primary-beam efficiency and minimal primary-beam sidelobes in the direction of the secondary beam.