Low Thickness Transmitarray Unit-Cell for Wideband Millimeter-wave Applications

Wideband millimeter-wave transmitarray antennas draw many interests in modern wireless communications when high speed connections for massive traffic are required. This paper introduces a unit-cell structure for wideband transmitarray antennas. The profile of the unit-cell is low with the total thickness of $\lambda_{0}/7.7$. The unit-cell structure has three metal layers printed on two identical substrates. The designed structure is based on polarization rotation technique to provide eight phase states with a phase step of 45° within a wide -1dB transmission bandwidth from 21 GHz to 31.5 GHz.