Author： Ismail T.H. Mismar M.J. Dawoud M.M.
Publisher： Taylor & Francis Ltd
ISSN： 1569-3937
Source： Journal of Electromagnetic Waves and Applications, Vol.13, Iss.1, 1999-01, pp. : 93-94
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Abstract
This paper presents a new technique for the synthesis of multiple wide band nulls by controlling the complex current excitations in linear arrays. The complex current excitations are determined using the minimax approximation approach to suppress multiple wide band sectors while maintaining the sidelobe level and the main beam width almost unchanged. This method estimates the required number of pattern nulls to realize the prescribed suppressed sectors and locates the positions of the remaining nulls to control the optimum sidelobe level for the perturbed pattern in the minimax sense. The results show the formation of single and multiple wide band nulls at arbitrary prescribed directions. Also, this method can impose arbitrary symmetric and asymmetric nulls in the sidelobe region and hence, overcome the limitations of the linearized amplitude-only or phase-only solutions.
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