| 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 S<SUB>1 </SUB>and N<SUB>1</SUB>, 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<SUB>2 </SUB>and N<SUB>2</SUB>, respectively, the weight ratio is (S<SUB>2</SUB>/S<SUB>1</SUB>)x(N<SUB>1</SUB>/N<SUB>2</SUB>)<SUP>2</SUP>.
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