GA-Produced Refiectarray Elements Having Arbitrary Phase-Difference Between Two Orthogonal Linear-Polarizations

This paper proposes novel reflectarray resonant elements designed by genetic algorithm(GA), which have arbitrarily phase difference from -180° to 180° between the TE (V-pol.) and the TM (H-pol.) polarizations from 13 GHz to 17 GHz. Moreover, these elements have two axially symmetric structure in the unit cell so that the cross polarization level is suppressed less than about -60 dB for the wide frequency range. A reflectarray antenna with two-separated offset feeds is designed by using proposed elements in the Ku-band, and its effectiveness is verified by evaluating radiation patterns numerically.