Wide-Angle Circular Polarization Converter Based on a Metasurface of Z-Shaped Unit Cells

Mingjun Wang,Zhizhu Zhai

doi:10.3389/fphy.2020.527394

Mingjun Wang, Zhizhu Zhai

Open Access

https://doi.org/10.3389/fphy.2020.527394

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Abstract

Since it’s designable, metasurface was widely used in various fields, especially the design of polarization converters. However, most of the polarization converters currently designed can only work under normal incidence or small angle incidence, which hugely limits the application of the device. In this paper, a chiral metasurface based on the z-shaped unit cell which can manipulate circular polarization wave is proposed. The simulation result shows that this converter can maintain the polarization state of circular polarization after reflection from 8.18 to 13.988GHz with a polarization conversion ratio more than 90%. Moreover, the structure is insensitive to incidence angle，which can keep a stable performance both for left-handed circularly polarized wave and right-handed circularly polarized waves as the incident angle increase to 75°. The proposed metasurface with simple structure, angular stability can be used in communication and polarization manipulating devices.

Highlights

Polarization, as one of the basic characteristics of electromagnetic (EM) waves, can be divided into three types: linear polarization, circular polarization, and elliptical polarization
We carried out works to overcome the shortcomings of the strong angle sensitivity of existing polarization converters and proposed a reflective circularly polarized (CP) regulator using a chiral metasurface based on the unit cell having a zshaped structure
The results show that the reflection coefficients curves of the two cases almost wholly coincide; the polarization conversion rate (PCR) satisfies this rule

Summary

INTRODUCTION

Polarization, as one of the basic characteristics of electromagnetic (EM) waves, can be divided into three types: linear polarization, circular polarization, and elliptical polarization. We carried out works to overcome the shortcomings of the strong angle sensitivity of existing polarization converters and proposed a reflective CP regulator using a chiral metasurface based on the unit cell having a zshaped structure. We regulate the rotation direction of the reflected wave, that is, to maintain the handedness of the circularly polarized wave It shows that our design has the advantages of simple structure, small loss, and strong angular tolerance

MECHANISM DISCUSSION

Findings

CONCLUSION

DATA AVAILABILITY STATEMENT