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A novel optimization method to design the layout of printed reflectarrays for multibeam operation is presented in this paper. The proposed approach allows using different classes of cell elements to design the layout of reflectarrays. Therefore, phase curves do not have to fulfill the requirement of having a phase range wider than 360°. The dimensions of each cell element are adjusted to achieve the required phase distribution to radiate symmetric or asymmetric multiple beams. Five different reflectarrays have been designed by using this technique. Numerical simulations demonstrate high gain performance and low side lobe levels.

Optimization Approach to Design Single Feed Symmetric and Asymmetric Multibeam Reflectarrays