Array Failure Correction with Placement of Wide Nulls in the Radiation Pattern of a Linear Array Antenna Using Iterative Fast Fourier Transform

The iterative Fast Fourier technique to array failure correction with placement of single wide nulls and dual wide nulls while keeping the side lobe level to its minimum value, are presented in this paper. The paper describes the iterative Fourier technique for the synthesis of low-side lobe patterns for linear arrays with uniform element spacing. The method uses the property that for a linear array with uniform element spacing, an inverse Fourier transform relationship exists between the array factor and the element excitations. This property is used in an iterative way to derive the array element excitations from the prescribed array factor. The effectiveness of this method for realizing lower values of side lobe levels and placing the single wide nulls and dual wide nulls at different FFT points will be demonstrated for linear arrays equipped with 34 elements. This demonstration of effectiveness also involves the recovery of the original low-side lobe levels as close as possible, in case of element failures.