Asymmetric dual‐band linear‐to‐circular converter by bi‐layered chiral metamaterial

In this article, we present a dual-band linear-to-circular transparent converter by bi-layered chiral metamaterial (CMM) with an inverted “G” array in microwave region. The proposed metasurface consists of three layers which are the upper layer of the metasurface with a periodic regular metallic inverted “G” and wire array, the dielectric layer, and the bottom layer operating as chiral symmetric structure of the upper. The simulation results show that the transmitted right-circular polarized wave with the axial ratio of 3 dB or less is in the range of 8.6-10.9 GHz and the left-circular polarized wave is within 18.1-22.5 GHz when y-polarized forward wave is normally incident. Specifically, the polarization conversion transmission can be maintained at over 85% at angle of incidence up to 40°. Therefore, the proposed CMM device is useful for the development of the integrated polarization manipulation devices.