Abstract: In order to suppress wideband interference and make the pattern null in the direction of interference, a new
wideband transmitting beamforming algorithm is presented based on the LFM waveform. The method uses digital weight and
frequency-dependent phase weight to replace phase shifters at the element level and analog time delay units at the subarray
level respectively, which avoids using analog time delay units that cause quantization style errors and high cost. Moreover,
digital weight in subarray can be constructed by the narrowband method and make a wide null, realizing the wideband pattern
null finally. Finally, the computer simulations illustrate that the proposed algorithm can keep waveform range resolution and
obtain pattern null.

Key words: wideband phased array, digital beamforming, LFM