A remote calibration for DBF transmitting array antennas by using synchronous orthogonal codes

Since the performance of the array antennas is degraded due to the amplitude and phase imbalance between the antenna elements, unknown mutual coupling coefficients, unknown element location and so on, a calibration process is indispensable. Moreover fast convergence of the calibration process is required in some systems. This paper focuses upon the calibration of the amplitude and phase imbalance of the adaptive transmitting array antennas and proposes a simple method by using synchronous orthogonal codes. In this method, the calibration coefficients compensating for the imbalance can be obtained simultaneously by digital signal processing. It is assumed that the direction to the receiving antenna is known and receiving antenna has one element.