A novel broadband polarisation conversion reflective metasurface

Abstract

A metasurface‐based broadband reflective polarisation converter with dual L‐shaped patches and dual trapezoidal patches for linear‐to‐linear polarisation conversion and linear‐to‐circular polarisation conversion is proposed in this study. The simulated and measured results demonstrate that the polarisation rotation can be effectively implemented in the frequency bands 9.24–12.25 GHz and 21.23–23.01 GHz, with the fractional bandwidth of the former being 28.01%. In addition, linear‐to‐circular polarisation conversion is performed with fractional bandwidths of 42.86% and 14.49% at 13.09–20.23 GHz and 23.62–27.31 GHz respectively. In the primary bands of linear‐to‐linear polarisation conversion and linear‐to‐circular polarisation conversion, the converter can operate within an incident angle range of 55° for polarised wave. This design may have potential uses in polarisation control devices used in the field of communications in X‐, Ku‐ and K‐bands.

Quad‐band reflective metasurface for linear to circular polarization conversion

“…However, these surfaces had limitations such as the 3-dB axial ratio (AR) fractional bandwidth, the bulkiness of the applied structure, and a varied response based on the incident angle. As a result of these shortcomings, metasurface (MS)-based PCs can change the polarization of incident waves, either in transmission mode, [13][14][15] reflection mode, [16][17][18][19][20] or both modes. [21][22][23] A transmissive PC is made up of an array of subwavelength elements that are patterned on a thin dielectric substrate to enable the controlled transmission of incident waves through surfaces.…”

“…However, these surfaces had limitations such as the 3‐dB axial ratio (AR) fractional bandwidth, the bulkiness of the applied structure, and a varied response based on the incident angle. As a result of these shortcomings, metasurface (MS)‐based PCs can change the polarization of incident waves, either in transmission mode, 13–15 reflection mode, 16–20 or both modes 21–23 …”

“…With an AR fractional bandwidth of 42%, this surface provides right‐hand CP (RHCP) PC in the frequency range of 8.34 to 8.71 GHz and left‐hand CP (LHCP) from 10.3 to 14.73 GHz. Besides this, in Qu et al 19 dual CP conversion is implemented in the frequency bands 13.1–20.23 and 23.62–27.31 GHz with LHCP and RHCP, respectively. This paper presents a new MS structure which introduces a quad‐band linear to CP conversion.…”