X band two layer printed reflectarray with shaped beam

X-band cosecant square shaped beam microstrip reflectarray is designed, fabricated and measured. For this reflectarray, a unit element in stacked patch configuration is used. In order to synthesize shaped beam pattern, phase-only synthesis method based on genetic algorithm is used. Phases of reflected electric field from antenna elements are adjusted by changing the dimensions of the patches. Infinite array approach is utilized to obtain reflection phase curves versus patch size. Radiation patterns are measured in spherical near field range and results are compared with simulations. It is shown that the cosecant square shaped beam reflectarray antenna is capable to operate in a band of 8.6-9.7 GHz.