Circularly Polarized Folded Transmitarray Antenna for Multi-beam Applications

A circularly polarized multibeam folded transmitarray antenna (CP-MFTA) with a lower profile and high gain is proposed in this paper. It has a lower profile than normal reflectarray and transmitarray antennas as well as folded reflectarray antennas, with linearly-polarized (LP) sources and circularly-polarized radiation beams. As an example, a CP-MFTA operating at 29 GHz is designed and simulated. The numerical results successfully demonstrate the CP multibeam functionality, with appropriate bandwidths for the impedance matching and the 3-dB axial ratio.