Patent ID: 7340248

Claim:
A calibration apparatus, in a wireless transmission diversity apparatus comprising first and second transmission portions which transmit the same signals and which calibrates the phases of main signals input to each of the antenna elements of the array antennas of said first and second transmission portions, comprising: a calibration signal generation portion for generating calibration signals; a first signal combining portion for combining the main signals input to each of the antenna elements of said first transmission portions with said calibration signals; a second signal combining portion for combining the main signals input to each of the antenna elements of said second transmission portions with said calibration signals; a first wireless retention portion for wirelessly receiving calibration signals radiated from all the antenna elements of the first transmission portion via a single antenna element of the second transmission portion; a second wireless reception portion for wirelessly receiving calibration signals radiated from all the antenna elements of the second transmission portion via a single antenna element of the first transmission portion: an RF switch, to which are input signals radiated from all the antenna elements of said second transmission portion via said single antenna element of said first transmission portion, to which are input signals radiated from all the antenna elements of said first transmission portion via said single antenna element of said second transmission portion, and which switches and outputs said input signals; a receiving portion for demodulating the signals switched by said RF switch; a calibration signal detection portion for detecting calibration signals from said demodulated signals; a weight generation portion, which uses the calibration signals detected for each antenna element to calculate a calibration weight for each antenna element to control the phase of the main signal input to each of the antenna elements of said first transmission portion and the phase of the main signal input to each of the antenna elements of said second transmission portion; a first phase shifter, which executes control of phase shifting of the main signals input to each of the antenna elements of said first transmission portions, based on said calculated calibration weights; and a second phase shifter, which executes control of phase shifting of the main signals input to each of the antenna elements of said second transmission portions, based on said calculated calibration weights.