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

Wang, Mingjun; Zhai, Zhizhu

doi:10.3389/fphy.2020.527394

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…To date, several systems based on metasurfaces have been proposed to control the polarisation of an EM wave both in terms of Linear-to-Linear (LP-to-LP) and Linear-to-Circular (LP-to-CP) conversion [11]. With this regard, polarization control can be achieved via resonating [12], anisotropic [13], chiral [14] and artificial magnetic conductor [15] elements, both in transmission and reflection modes [16]. Notably, LP-to-LP [17] and LP-to-CP [18] ultra-wideband conversions have been demonstrated relying on anisotropic metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Plasma-Based Reflective Surface for Polarization Conversion

Magarotto

Schenato

Carlo

et al. 2023

IEEE Trans. Antennas Propagat.

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This study analyses, for the first time, the use of reflective surfaces based on magnetized plasmas for polarisation conversion. The feasibility of this concept has been assessed via a theoretical model. Moreover, the numerical design of a plasma-based reflective surface is presented. The latter enables linear-to-linear and linear-to-circular polarisation conversion over a broad frequency range, from 7.5 GHz to 13 GHz. To this end, the applied magnetic field intensity has to be tunable over 55-140 mT, and its direction steerable towards three mutual orthogonal axes. At the same time, the plasma density has to be controlled up to 2 × 10 18 m −3 . These requirements are consistent with the plasma technology at the state-of-the-art.

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Section: Introductionmentioning

confidence: 99%

Plasma-Based Reflective Surface for Polarization Conversion

Magarotto

Schenato

Carlo

et al. 2023

IEEE Trans. Antennas Propagat.

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“…It is shown that a properly designed metasurface has a great potential of converting a given polarization into other polarization types (e.g., circular and elliptical) with the benefits of inexpensive profile and light weight [14,15]. Although broadband linear polarization (LP) [16], circular polarization (CP) [17], and effective narrow-band [18,19] conversions have been performed partly in existing studies, to the best of our knowledge, there is no polarization converter with the features of ultra-thin and oblique-angle independence capable of simultaneously utilizing the polarization types of both linear and circular polarized waves operating at C-(4-8 GHz), X- (8)(9)(10)(11)(12), and Ku-bands (12)(13)(14)(15)(16)(17)(18). Therefore, multiband devices are in high demand.…”

Section: Introductionmentioning

confidence: 99%

Cheaper, Wide-Band, Ultra-Thin, and Multi-Purpose Single-Layer Metasurface Polarization Converter Design for C-, X-, and Ku-Band Applications

Kaya

2023

Symmetry

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This article presents the design of wide-band, ultra-thin, and multi-purpose polarization converter utilizing metasurface for C-, X-, and Ku-band applications. Having a topology on a FR-4 substrate with metasurface metallic patterns on the front and an all-metallic surface finish on the back, the unit cell of converter design has symmetry in the x−y plane with unique features of having both linear polarization (LP) and circular polarization (CP) property. While the polarization conversion ratio (PCR) of converter in normal incidence case is more than 90% in three different frequency bands of 6.46–6.78 GHz, 10.52–11.85 GHz, and 16.49–17.37 GHz, it shows linear-to-linear polarization feature and a linear-to-circular polarization feature with left-handed circular polarization (LHCP) for the frequency range between 7.28 and 9.40 GHz and right-handed circular polarization (RHCP) for the frequency range between 13.38 and 15.19 GHz. It is also seen that the converter has a PCR value of around 90% for oblique incidence case with incidence angles up to 45°. Extensive simulations have been conducted to prove the performance of suggested converter with the aid of a commercially-available simulation platform, called CST Microwave Studio. The advantages of suggested polarization converter are low-cost, wide-band, ultra-thin, and having both LP and CP conversion in C-, X-, and Ku-bands.

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“…Reflective polarization converters are known for their advantageous energy efficiency compared with their transmission-based counterparts. Researchers have explored a variety of structures in this category, including the cut-rhombus shape 27 , 8-shaped 28 , L-shaped 29 , double-square-shaped 30 , Z-shaped 31 , and ellipse-shaped 32 , all of which have demonstrated the potential for achieving polarization conversion through reflection. However, it is important to recognize the challenges in this area.…”

Section: Introductionmentioning

confidence: 99%

Design, optimization, and comparative analysis of wide-band polarization conversion along with dual coding sequences for RCS reduction

Ahmad,

Choi

2024

Sci Rep

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In this paper, a wideband polarization conversion metasurface is designed. Additionally, coding and chessboard metasurfaces are specifically tailored for radar cross-section reduction (RCS). Initially, a compact unit cell demonstrating exceptional polarization conversion performance is introduced, achieving a polarization conversion ratio (PCR) exceeding 90$$\%$$ % across frequencies ranging from 7.9 to 22.7 GHz. The PCR remains effective even when oblique incidence angles of up to 30$$^\circ$$ ∘ are utilized across this frequency band. Roger RT5880, with a thickness of 0.254 mm, serves as the substrate. An airgap is introduced between the substrate and the ground plane to enhance the polarization conversion bandwidth. This unit cell serves as the fundamental building block for subsequent metasurface configurations. To assess the scalability and effectiveness, a 36 $$\times$$ × 36 unit array is assembled, confirming efficient polarization conversion capabilities extending to larger structures. Moreover, a 1-bit coding unit “0” and “1” are formed by the Pancharatnam-Berry phase based on the same-sized meta-atom with 90$$^\circ$$ ∘ orientations. The robustness and practicality of the design are demonstrated by creating 12 $$\times$$ × 12 lattices and evaluating their RCS reduction potential under two distinct scenarios: a chessboard pattern and a coding-based scheme. Notably, its results indicate substantial RCS reduction across a broad frequency spectrum (7.9 to 22.7 GHz) for both configurations. This study demonstrates the wide-ranging applicability of metasurface design, making it a valuable contribution to the fields of microwave engineering, polarization control, and radar stealth technology. Owing to its simplicity, bandwidth, and versatility, this approach offers innovative solutions for diverse real-world applications.

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

Cited by 13 publications

References 20 publications

Plasma-Based Reflective Surface for Polarization Conversion

Plasma-Based Reflective Surface for Polarization Conversion

Cheaper, Wide-Band, Ultra-Thin, and Multi-Purpose Single-Layer Metasurface Polarization Converter Design for C-, X-, and Ku-Band Applications

Design, optimization, and comparative analysis of wide-band polarization conversion along with dual coding sequences for RCS reduction

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