Patent ID: 7702287

Claim:
A communication apparatus comprising a calibration unit, a transmit-receive unit, and a plurality of antenna units coupled to each of the calibration unit and the transmit-receive unit, wherein: the communication apparatus further comprises a calibration signal obtainer to obtain a calibration signal; the calibration unit comprises a first transmitter to transmit the calibration signal obtained by the calibration signal obtainer to each of the antenna units; each of the antenna units comprises a first obtainer/transmitter to obtain the calibration signal transmitted by the first transmitter and to transmit to the transmit-receive unit; the transmit-receive unit comprises a first calibration weight basic amount calculator to calculate a first calibration weight basic amount based on the calibration signal transmitted by the first obtainer/transmitter and a second transmitter to transmit the calibration signal obtained by the calibration signal obtainer to each of the antenna units; each of the antenna units further comprises a second obtainer/transmitter to obtain the calibration signal transmitted by the second transmitter and to transmit to the calibration unit; the calibration unit further comprises a second calibration weight basic amount calculator to calculate a second calibration weight basic amount based on the calibration signal transmitted by the second obtainer/transmitter; and the communication apparatus further comprises a calibration weight calculator to calculate a calibration weight based on the first calibration weight basic amount and the second calibration weight basic amount.