Smart antenna device with increased operation speed and complex smart antenna device using smart antenna device

摘要

A smart antenna device includes: first and second weighting units provided to correspond to two antennas disposed apart from each other so as to weight received signals inputted from the antennas, respectively; an operating unit that obtains a ratio of a weight of the second weighting unit to a weight of the first weighting unit; an adding unit that adds a signal outputted from the first weighting unit and a signal outputted from the second weighting unit to each other; and a phase shifting unit that makes phases of the two signals equal to each other. When the magnitude of a signal component and the magnitude of a noise component of the signal inputted to the first weighting unit are assumed to be S₁ and N₁, respectively, and the magnitude of a signal component and the magnitude of a noise component of the signal inputted to the second weighting unit are assumed to be S₂ and N₂, respectively, the weight ratio is (S₂/S₁)×(N₁/N₂)².