Patent ID: 7440739

Claim:
A smart antenna device comprising: 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, wherein, 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 S 1 and N 1 , 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 S 2 and N 2 , respectively, the weight ratio is (S 2 /S 1 )×(N 1 /N 2 ) 2 .