It can constrain frequency response of filter Banks to form null at zero frequency point and to obtain minimum side lobe area.

The direction of acoustic beam and angular width of main lobe can be changed by properly amplitude-weighting, decreasing the frequency of impulsive signal and adjusting the interval of array elements.

It is promised that the lobe pattern and impedance of a antenna are kept common in a wider frequency field (as bandwidth is 10 or more).