In this paper,pattern synthesis with broad nulls is converted into a target problem which is a nonlinear optimization problem,and a niche based genetic algorithm is used to optimize the weights of the array.

Research on beamforming of wide nulling algorithm;

Method of null steering by phase control;

A null steering technique by phase and element position perturbations;

Based on this new method,a selective algorithm is introduced for the purpose of reducing the number of controlled elements for null steering,and increasing.

It is often desireable to widen the interference null width in an adapted pattern to impart robustness into the realized adapted pattern in some real environments.

The character of the eigenvalues of the constraint matrix was aimed,and the character is that the matrix has the same number of larger eigenvalues as number of the nulls that the matrix denoted.

The most basic problem of designing antenna array is deciding radiation pattern, if we can specify the positions of the nulls, and make the nulls aim at the interferes on given angle on pattern, it will restrain interferes effectively, and minimize Signal-to-Noise capability drop that is caused by int.