PURPOSE: An apparatus for correcting error of an array transmitting/receiving unit and a method thereof are provided to reduce the error of the array transmitting/receiving unit by measuring the characteristic of the transfer function between the channels of the array transmitting/receiving unit and by correcting it in a base band. CONSTITUTION: In an array receiving unit, an I/Q(in-phase/quadrature phase) demodulator(123) multiplies the receiving signal of an IF(intermediate frequency) band by a sine wave having the phase difference of 90 degree to convert a base band signal. In an array-transmitting unit, an I/Q modulator(127) multiplies an I-channel and a Q-channel by a sine wave having the phase difference of 90 degree, and generates the added signal.
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