Patent ID: 7248898

Claim:
A radio device comprising: an array antenna including a plurality of antennas; a reception signal processing unit multiplying signals provided from said respective antennas of said array antenna by reception weights, and thereby extracting a signal received from desired another radio device; first switch means provided corresponding to at least one of said plurality of antennas for providing the signal received from the corresponding antenna to said reception signal processing unit in a receive operation; and a transmission signal processing unit modulating and providing a transmission signal to said first switch means corresponding to the one antenna of said plurality of antennas, wherein said first switch means provides the signal received from said transmission signal processing unit to said corresponding antenna in a transmission operation, said first switch means are provided corresponding to said plurality of antennas, respectively, said radio device further comprising: reception level measuring means for measuring reception levels of the signals transmitted from a terminal to be communicated with said radio device and received by said plurality of antennas, respectively; storage means for storing results of the measurements of said reception level measuring means; antenna selecting means for selecting the antenna having the maximum reception level from said plurality of antennas based on information stored in said storage means; and second switch means for providing the signal provided from said transmission signal processing unit to said first switch means corresponding to the selected antenna in accordance with a result of selection by said antenna selecting means.