The general problem of modifying antenna array patterns by adjusting only the phase of the elements is discussed. It is shown that, in the case of endfire arrays, considerable reduction of the sidelobe levels can be obtained by using small departures from progressive phasing. Simple formulas for the required phasing are derived. An alternative method, using only a single pair of "sidelobe-reducing" elements, is also given.
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Roger F. Harrington (1963) studied this question.
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