Flexible broadband polarization converter based on metasurfaceat microwave band

TL;DR

This paper introduces a flexible, broadband microwave polarization converter using metasurface technology, achieving high efficiency over a wide frequency range and adaptable to conformal surfaces, with potential applications across electromagnetic regimes.

Contribution

The paper presents a novel flexible broadband polarization converter based on metasurface with multiple resonances, optimized for wide bandwidth and angle independence, suitable for conformal applications.

Findings

Achieves over 85% polarization conversion ratio from 11.3 to 20.2 GHz.

Maintains high efficiency on convex cylindrical surfaces.

Demonstrates potential for microwave, terahertz, and optical applications.

Abstract

This paper proposes a flexible broadband linear polarization converter based on metasurface operating at microwave band. In order to achieve bandwidth extension property, long and short metallic arc wires, as well as the metallic disks placed over a ground plane, are combined into the polarizer, which can generate three neighboring resonances. Due to the combination of the first two resonances and optimized size and thickness of the unit cell, the polarization converter can have a weak incident angle dependence. Both simulated and measured results confirm that the average polarization conversion ratio is over 85% from 11.3 to 20.2 GHz within a broad incident angle from 0{\deg} to 45{\deg}. Moreover, the proposed polarization converter based on flexible substrates can be applied for conformal design. The simulation and experiment results demonstrate that our designed polarizer still keeps high polarization conversion efficiency even when it adheres on convex cylindrical surfaces. The periodic metallic structure of the designed polarizer has great potential application values in the microwave, terahertz and optic regimes.