Null shaping in the radiation pattern of phased array with nonrectangular aperture

The aim this paper is improvement of operationability of compensation phase definition in the multielement phased array with nonrectangular aperture by the null shaping in the directional characteristic. The problem of the modification this metod based on minimization of the error functional, formulated for subarrays, factor relative to nonrectangular aperture planar phased array is solved to achieve this purpose.

The method modification assume addition of aperture by virtual radiating elements with further equal subarray sectionalisation. Decomposition procedure is applied for the radiating elements situated at the border of two or four subarrays. The phase vector correcting subarray phases is finded by minimizing of the error functional which dimension is equal to the half of subarray quantity. At definition radiation pattern of phased array the virtual radiating elements contribution are eliminated taking into consideration subarray phase.

Improvement of operationability of compensation phase definition in the multielement phased array by the null shaping in the radiation pattern is achieved by definition of the error functional deminsion in consequence of subarray phase compensation, but not of radiating element phase compensation.

The eighth order of the error functional for high-level lobe suppression in directional characteristic hexagonal aperture phased array, which consists of 217 elements is used in the given example.