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Wide-angle nulling for sum and difference beam patterns

A robust method of beam pattern nulling is discussed in this paper. The method achieves required nulls in the specified directions by perturbing the amplitudes and the phases of the aperture distribution coefficients of the sum and difference beams. The technique is flexible enough to handle a very wide variety of pattern nulling problems since it minimizes antenna sidelobe levels in specified directions while maximizing antenna pattern gain. The theory can be applied to discrete-angle nulling for the sum beam, the difference beam, sum and difference beams simultaneously, as well as wide-angle nulling.