Hybrid alternate projection algorithm and its application for practical conformal array pattern synthesis

Based on the fabricated 12-element cavity-backed microstrip sector cylinder array, a novel hybrid alternate projection algorithm (HAPA), which combines analytical method with numerical techniques effectively, is proposed for synthesizing the pattern of practical conformal array. The algorithm applies the variable direction aperture projection method with mutual coupling correction techniques to provide the good initial excitations of elements to the enhanced alternate projection algorithm (EAPA). In order to do further optimization, which improves the convergent speed of the algorithm significantly. Finally, the HAPA has been applied to the fabricated sector cylinder array with mutual coupling considered. The results of synthesized patterns, such as low sidelobe with null points formed pattern, beam scanning with low sidelobe pattern and the shaped beam pattern are presented. It demonstrates the validity of HAPA in practical conformal array synthesis.