Patent ID: 7860535

Claim:
A radio-frequency receiver device including a plurality of receiver antenna elements each arranged to receive signals transmitted from communication objects, said radio-frequency receiver device comprising: a phased-array control portion configured to perform a phased array antenna control for controlling a directivity of reception of the signals by said plurality of receiver antenna elements; an adaptive-array control portion configured to perform an adaptive array antenna control for controlling the directivity of reception of the signals by said plurality of receiver antenna elements; a received-signal-quality determining portion configured to determine whether the signals received by said plurality of receiver antenna elements have a quality of at least than a predetermined threshold; and a directivity control switching portion configured to enable said phased-array control portion to perform said phased array antenna control for controlling said directivity of reception of the signals, and to enable said adaptive-array control portion to perform said adaptive array antenna control for controlling said directivity of reception of the signals only if said received-signal-quality determining portion makes a negative determination that the quality of at least one signal is less than the predetermined threshold after said phased array antenna control.