Multiband Efficient Asymmetric Transmission With Polarization Conversion Using Chiral Metasurface

• Published in: IEEE antennas and wireless propagation letters Vol. 19; no. 7; pp. 1137 - 1141
• Main Authors: Khan, M. Ismail, Hu, Bin, Chen, Yixiao, Ullah, Naeem, Khan, Muhammad Junaid Iqbal, Khalid, Ataur Rehman
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Asymmetry; Chiral; circular polarization; Electromagnetics; Frequencies; Holography; Impinging waves; Incidence angle; Linear polarization; Metamaterials; metasurface; Metasurfaces; Microwave frequencies; Numerical stability; Polarization; Robustness (mathematics); Stability analysis
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2020.2991521

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 x/y 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.