Patent ID: 6735182
Filing Date: 2004-05-11
Classification: H01Q

Abstract:
An adaptive array antenna system comprising;N (N=>2, N is an integer) number of antenna elements (1-1-1 through 1-1-N), N number of transmitters (1-3-1 through 1-3-N), N number of receivers (1-4-1 through 1-4-N), a directivity calculation circuit (1-7) for controlling radiation pattern of said adaptive antenna system by weighting amplitude and phase of signals applied to a respective receiver related to each antenna element, and combining weighted signals, said adaptive array antenna being used in Time Division Duplex communication system, each transmitter being coupled with a related antenna element during transmit time slot in communication, and having means (1-5-1 through 1-5-N) for sending a part of transmit signal to at least one receiver, amplitude/phase calibration calculation circuit (1-6) receiving outputs of at least two receivers which receive a signal from a transmitter during transmit time slot, and providing amplitude/phase calibration value of a branch related to said transmitter and said receivers by ratio of outputs of said at least two receivers.