INDEPENDENT NULL STEERING IN THE SUM AND DIFFERENCE PATTERNS OF ANTENNA-ARRAYS USING REAL WEIGHTS

A method for steering nulls in the sum and difference patterns of a ph ased linear antenna array using only real weights is introduced. The p roposed method decouples the weights so that a given jammer is associa ted with a given weight value. A change in the jammer's direction chan ges only its corresponding weight value without affecting the other nu lls. The main beam is steered independently using a progressive phase shift. This allows the signal-to-jammer power ratio to be maximized wi th relative ease. The drawback of this method is that the number of ja mmers that can be nulled will be reduced to about a quarter of the num ber of array elements.