Multi-Band Multi-Functional Metasurface-Based Reflective Polarization Converter for Linear and Circular Polarizations

Ultrathin chiral metasurface with multiple functionalities

“…Once the magnitudes and phases of the co-and crosspolarized transmission coefficients are measured using the VNA, the ARs and S 3 /S 0 ratios within the three simulated asymmetric LTC bands are calculated using Equations (3) and (4). The measured values are plotted in Figure 8.…”

“…The MSs derive these properties from the geometry of their unit cells. They are capable of modifying the amplitude, phase, and polarization of an incident electromagnetic (EM) wave in reflection and/or transmission 1–5 …”

“…They are capable of modifying the amplitude, phase, and polarization of an incident electromagnetic (EM) wave in reflection and/or transmission. [1][2][3][4][5] Modifying the polarization state of an incident EM wave is desirable in many scenarios. Therefore, polarization converters have found a place in different EM applications such as antenna design, remote sensing, and imaging.…”

A novel broadband polarisation conversion reflective metasurface

“…An important index to measure the degree of circular polarisation of electromagnetic waves is Axial Ratio (AR). Axial Ratio can be calculated by the following formula in methods according to [25]: $$$\mathrm{A}\mathrm{R}={\left(\frac{{\left\vert {R}_{xx}\right\vert }^{2}+{\left\vert {R}_{yx}\right\vert }^{2}+\sqrt{a}}{{\left\vert {R}_{xx}\right\vert }^{2}+{\left\vert {R}_{yx}\right\vert }^{2}-\sqrt{a}}\right)}^{1/2}$$$ $$$a={\left\vert {R}_{xx}\right\vert }^{4}+{\left\vert {R}_{yx}\right\vert }^{4}+2{\left\vert {R}_{xx}\right\vert }^{2}{\left\vert {R}_{yx}\right\vert }^{2}\mathrm{cos}\left(2{\Delta }{{\Phi }}_{x-y}\right)$$$ …”

“…One is to load microwave switching elements to realise reconfiguration [19,20], and realise multiple polarisation conversions with different unit structures in the same frequency band or in different frequency bands. The other is the traditional single-layer or multi-layer structure [21][22][23][24][25][26][27][28][29][30], which can only achieve different polarisation conversions in different frequency bands, or realise polarisation conversions at different angles by rotating the structure plane during application. Since the frequency band of this metasurface design's polarisation conversion is set, the researchers intend to expand the bandwidth and frequency bands.…”