An ultra-wideband ellipse-shaped linear-to-circular polarization conversion metasurface with high efficiency

IF 0.6 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Electromagnetics Pub Date : 2022-08-18 DOI:10.1080/02726343.2022.2144062

B. Lin, Wenzhun Huang, Jianxin Guo, Yan-wen Wang, Hongjun Ye, Xiang Ji

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引用次数: 2

Abstract

ABSTRACT In this work, a high-efficiency ultra-wideband ellipse-shaped linear-to-circular polarization conversion metasurface is proposed. The metasurface is composed of a square array of ellipse-shaped metal patches printed on grounded dielectric substrate and covered by a dielectric layer, because it is an orthogonal anisotropic structure with a pair of mutually perpendicular symmetric axes u and v along the directions ±45° with respect to the vertical y-axis, and the reflection phase difference under u- and v-polarized incidences is very close to −90° in an ultra-wide frequency ranges, both theoretical prediction and numerical simulation show that the metasurface can achieve high-efficiency ultra-wideband linear-to-circular polarization conversion under x- and y-polarized incidences, its 3-dB axial-ratio (AR) band is between 7.08 and 25.86 GHz with a relative bandwidth of 114%, in particular, the AR of its reflected wave can be kept lower than 0.89 dB in the frequency range 7.65–25.32 GHz, in which the polarization conversion rate (PCR) is always larger than 99.73%. Finally, one effective experimental verification is carried out, and a reasonable agreement is observed between the simulation and experimental results. Therefore, the polarization conversion metasurface has great potential application values in various polarization-controlled devices.

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一种高效率的超宽带椭圆型线圆极化转换超表面

摘要在这项工作中，提出了一种高效的超宽带椭圆线性到圆偏振转换元表面。元表面由印刷在接地电介质基板上并由电介质层覆盖的椭圆形金属贴片的方形阵列组成，因为它是一个正交各向异性结构，具有一对相互垂直的对称轴u和v，沿相对于垂直y轴±45°的方向，并且在超宽频率范围内，u和v偏振入射下的反射相位差非常接近−90°。理论预测和数值模拟都表明，超表面可以在x和y偏振入射下实现高效的超宽带线性到圆偏振转换，其3dB轴比（AR）波段在7.08至25.86GHz之间，相对带宽为114%，特别是在7.65至25.32GHz的频率范围内，其反射波的AR可以保持在0.89dB以下，其中偏振转换率（PCR）始终大于99.73%。最后，进行了一次有效的实验验证，并且在模拟结果和实验结果之间观察到了合理的一致性。因此，偏振转换超表面在各种偏振控制器件中具有巨大的潜在应用价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electromagnetics 工程技术-工程：电子与电气

CiteScore

1.60

自引率

12.50%

发文量

审稿时长

6 months

期刊介绍： Publishing eight times per year, Electromagnetics offers refereed papers that span the entire broad field of electromagnetics and serves as an exceptional reference source of permanent archival value. Included in this wide ranging scope of materials are developments in electromagnetic theory, high frequency techniques, antennas and randomes, arrays, numerical techniques, scattering and diffraction, materials, and printed circuits. The journal also serves as a forum for deliberations on innovations in the field. Additionally, special issues give more in-depth coverage to topics of immediate importance. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. Submissions can be made via email or postal mail.