Adaptive antenna system (AAS) using a six-port module

Generally, an Adaptative Antenna System (AAS) controls the beam shape and steering. AAS's tasks are essentially to find the direction of an emitter and to reduce sidelobe levels of the antenna pattern in the direction of interferences. AAS finds application in radars [1] and in mobile or wireless indoor communications [2]. The AAS contains coherent receivers giving relative phase and magnitude and polarization of the incoming wave field sampled by radiators array [1]. Coherent receivers are either In Phase and Quadrature phase detectors using mixers and local oscillator, or either six-port systems using power detectors [3]. In this last case [3], AAS calibration was performed without radiator array. This paper presents a new calibration procedure of the overall AAS taking into account coupling factor of each radiator of the AAS.