Method for tuning a phased array antenna

摘要: During installation or maintenance of a phased array antenna system in which the transmission line to each element includes an adjustable phase shift device, it is required that effective electrical lengths lines be adjusted equal, alternatively errors determined and stored as correction data for use during normal operation. One way doing this modulate by ±90° device one at time, while applying test signal all elements. The radiated array, received via antenna, supplied envelope detector. If out tune, has different amplitudes +90° -90° modulation. tuned adjusting length its adjustment obtain null amplitude In improved technique, reduce certain errors, sum tuning used, modulation applied devices, except being tuned.