Circular Polarization Conversion Reflectarray Suppressing Beam Shift

This paper proposes arbitrary shaped elements for a linear-to-circular polarization reflectarray suppressing beam shift depending on frequencies. To make aperture phase distribution uniform even at different frequencies, each element achieves specified different frequency properties. So we optimize the elements with orthogonal two axial symmetries by the genetic algorithm (GA). Furthermore, linearly polarized orthogonal waves will be transformed into a circularly polarized one by making reflection-phase difference between TE/TM incidences 90 degrees.