Patent ID: 8559877

Claim:
A radio communication device that includes a radio communication unit transmitting simultaneously a plurality of communication data series using a same frequency band to a receiving device through a transmitting antenna unit including a plurality of transmitting antennas, comprising: an antenna selector configured to perform antenna selection processing when a communication quality degrades below a predetermined threshold in a radio communication channel between the radio communication device and the receiving device receiving simultaneously the plurality of communication data series and separating the plurality of communication data series into individual communication data series, the antenna selection processing performed by selecting, from among the plurality of transmitting antennas forming the transmitting antenna unit, such transmitting antennas that a distance between the transmitting antennas is shorter than before the communication quality degrades below the predetermined threshold, wherein the radio communication unit transmits the communication data series through the transmitting antennas selected by the antenna selector, the transmitting antenna unit includes a plurality of short transmitting antennas arranged with a distance therebetween not longer than a predetermined wavelength corresponding to the frequency band, among the plurality of transmitting antennas forming the transmitting antenna unit, all of a different transmitting antennas different from the plurality of short transmitting antennas have a longer distance therebetween than the predetermined wavelength, and all of the different transmitting antennas different from the plurality of short transmitting antennas have a longer distance to the short distance antenna group than the predetermined wavelength, and the antenna selector selects the short distance antenna group when the communication quality degrades below the predetermined threshold.