In this paper, the method of circularly polarized folded transmitarray antenna (CPFTA) is first proposed and studied based on transmitarray antenna (TA). The special element of TA is proposed to reflect x-polarized waves as a ground, transmit y-polarized waves and convert the y-polarized waves to circular polarized wave with arbitrary phase shift at the same time in the operating frequency band. A reflective polarizer based on metasurface is applied to twist the polarization of incident waves by 90°. The whole CPFTA, including the feeding source of microstrip antenna, transmitarray antenna, and reflective polarizer can be fully integrated.
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