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A simple technique for confining circular-array phase modes to angular sectors is introduced. Each sectoral phase mode (SPM) is a broadband directional beam characterised by an approximately linear phase slope. It is shown that the performance of a multimodal phase-comparison direction-finder in a multiple signal environment and the null steering agility of a multibeam null-steering system may be considerably improved.
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Griffiths et al. (1992) studied this question.
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