An ultra-thin multifunctional chiral metasurface with asymmetric transmission, cross-polarization conversion, and circular dichroism for Ku- and K-band applications

Abstract

In this paper, a bi-layered ultra-thin multifunctional chiral metasurface is proposed to obtain asymmetric transmission (AT), cross-polarization conversion (CPC), and circular dichroism (CD). The multifunctional chiral metasurface realizes AT with more than 70% efficiency over a frequency range of Ku-band from 14.3 to 15.8 GHz, while in the operating frequency band from 13.5 to 16.2 GHz, the CPC ratio is above 90%. In addition, the metasurface exhibits CD in the K-band with a CD parameter of 0.6 at 24 GHz. Furthermore, the functionalities of AT and CPC are stable for changes in incident angle up to 60° for both transverse-electric (TE) and transverse-magnetic (TM) electromagnetic (EM) waves. For verification of the anticipated concept, the proposed chiral metasurface is fabricated and measured. The proposed design can be used for potential applications in the Ku- and K-bands for satellite communication and radar.

A Low Profile Wideband Linear to Circular Polarization Converter Metasurface with Wide Axial Ratio and High Ellipticity

“…Polarization converters based on metasurfaces have been discovered to be a convenient method for changing the polarization of electromagnetic waves over multiple frequency ranges, such as the visible [8,9], terahertz [10], infrared [11], and microwave [12] frequencies. Most research studies have concentrated on designing converters that can change the polarization state within a given frequency band and perform linear-to-linear (LTL), linear-to-circular (LTC), and cross-polarization conversion (CPC) [13][14][15].…”