[1] “Novel wideband polarization rotating metasurface element and its application for wideband folded reflectarray,” IEEE Trans. Antennas Propag, 2019. (early version)

作者：Yue Cao, Wenquan Che*, Wanchen Yang, Chong Fan, Quan Xue

摘要：A novel wideband polarization rotating element based on a metasurface antenna is proposed. To achieve high polarization isolation and low cross polarization, a wideband differential-driven dual-polarized metasurface antenna is designed accordingly. By connecting the two differential ports of the dual-polarized metasurface antenna, a wideband polarization rotating metasurface element (PRMSE) is realized, while a large polarization rotating bandwidth of 27.6% can be achieved. In addition, combining the true-time delay (TTD) microstrip lines, the PRMSE can achieve linear phaseresponse andcan be applied to the folded reflectarray design. Based on the PRMSE, a 140-element center-fed folded reflectarray (FRA) is designed and fabricated.The measured radiation patterns of the FRA are stable within the frequency range from 26 to 32 GHz. The measured −10-dB impedance bandwidth is 25.4% from 25.4 to 32.8 GHz. Furthermore, the measured 1-dB gain drop and 3-dB gain drop are 20.7% and 34.5%, respectively. The measured sidelobe levels are below −13 dB and the cross-polarization levels are below −30 dB at the broadside direction within the entire operating band.