Multiband Efficient Asymmetric Transmission With Polarization Conversion Using Chiral Metasurface
M. Ismail Khan, Bin Hu, Yixiao Chen, Naeem Ullah, Muhammad Junaid Iqbal Khan, Ata Ur Rahman Khalid
Abstract
In this letter, multiband efficient asymmetric transmission is realized both numerically and experimentally in the microwave frequency regime, using a three-layered chiral metasurface (CMS). The proposed structure achieves propagation direction dependent polarization transformation where the plane of polarization is rotated by 90° for <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x/y</i> polarization in the backward/forward direction. The asymmetric polarization transformation functionality for linearly polarized impinging waves is accomplished in three frequency bands: 10.9–11.2 GHz, 14.4–14.8 GHz, and 18.4–18.5 GHz. Moreover, the structure has a robust response to the variation of incidence angle (up to 40°). The measurement results of the fabricated structure are found to be in good agreement with the numerical results.