The paper presents the results of investigations of array antennas intended to radiate high-power pulses of nanosecond and subnanosecond length. The array element is a combined antenna optimized for a given length of the exciting voltage pulse. Linear array antennas were investigated by the radiation wave beam in the steering mode. Possibility to form dual-polarization wave beams owing to the plane array antenna dividing into two sub-arrays and their excitation by the time-shifted voltage pulses was shown. Parameters of high-power radiation sources based on array antenna excitation by bipolar voltage pulses are presented.