An antenna structure comprising: a first antenna; a second antenna; at least one processor; a power distribution circuit configured to equally supply power supplied from the at least one processor to the first antenna and the second antenna; and a coupler disposed between the at least one processor and the power distribution circuit, wherein the at least one processor is configured to: obtain, through the coupler, a first parameter for a first signal received by the first antenna and a second parameter for a second signal received by the second antenna; detect a phase difference between the first signal and the second signal; obtain matching parameters for calibration for the first parameter and the second parameter, based on the first parameter, the second parameter and the detected phase difference corresponding to cases in which the phase difference satisfies a specified condition among the first parameter and the second parameter; and obtain a third parameter for allowing reflection coefficients of the first signal and the second signal flowing from the power distribution circuit to the coupler to exist within a specified range among the matching parameters to correct the matching parameters. a first antenna; a second antenna; at least one processor; a power distribution circuit configured to equally supply power supplied from the at least one processor to the first antenna and the second antenna; and a coupler disposed between the at least one processor and the power distribution circuit, wherein the at least one processor is configured to: obtain, through the coupler, a first parameter for a first signal received by the first antenna and a second parameter for a second signal received by the second antenna; detect a phase difference between the first signal and the second signal; obtain matching parameters for calibration for the first parameter and the second parameter, based on the first parameter, the second parameter and the detected phase difference corresponding to cases in which the phase difference satisfies a specified condition among the first parameter and the second parameter; and obtain a third parameter for allowing reflection coefficients of the first signal and the second signal flowing from the power distribution circuit to the coupler to exist within a specified range among the matching parameters to correct the matching parameters. obtain, through the coupler, a first parameter for a first signal received by the first antenna and a second parameter for a second signal received by the second antenna; detect a phase difference between the first signal and the second signal; obtain matching parameters for calibration for the first parameter and the second parameter, based on the first parameter, the second parameter and the detected phase difference corresponding to cases in which the phase difference satisfies a specified condition among the first parameter and the second parameter; and obtain a third parameter for allowing reflection coefficients of the first signal and the second signal flowing from the power distribution circuit to the coupler to exist within a specified range among the matching parameters to correct the matching parameters.