Ultra-wideband Linear-to-Circular Polarization Conversion Realized by an 8-shaped Metasurface

Lin, Baoqin; Huang, Wenzhun; Lv, Lintao; Guo, Jianxin; Huang, Shiqi; Zhu, Rui

doi:10.1007/s11468-020-01321-5

Cited by 13 publications

(9 citation statements)

References 25 publications

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“…To develop a better understanding of the designed polarizer performance, we define To further analyze the performance of CP conversion and determine the effective bandwidth of the proposed polarizer, we calculate the AR [36] by equations ( 14)-( 16) and observe that the AR is below 3 dB in 12.1-20 GHz, suggesting that the EM waves are CP. In addition, we compute the PCR [37] using the following equations ( 17)-( 19), as illustrated in figure 4(c designed polarizer is capable of efficiently converting the y-polarized incident waves into CP waves over the broad bandwidth.…”

Section: Resultsmentioning

confidence: 99%

Broadband and high-efficient reflective linear-to-circular polarizer with Wi-Fi shaped metasurface

Tian¹,

Wang²,

He³

et al. 2022

J. Phys. D: Appl. Phys.

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Arbitrarily manipulating the polarization states of electromagnetic (EM) waves has gained interest due to its wide application in modern wireless communication systems. However, conventional polarizers face major bottlenecks such as bulky size, low efficiency and narrow frequency band. This paper proposes a reflective linear-to-circular (LTC) polarizer using Wi-Fi shaped metasurface, and the designed polarizer can efficiently convert the linearly polarized (LP) incident waves into nearly perfect circularly polarized (CP) reflected waves in wideband frequency region of 12.1-20 GHz. Based on simulations, the polarizer has an axial ratio (AR) of ≤3 dB at 12.1-20 GHz and a relative bandwidth of 49.2%. The polarization conversion rate (PCR) is over 97% in 12.1-20 GHz. The physical analysis of the polarization conversion is based on the surface current distributions. To validate the simulations, microwave tests are carried out, and the theory, simulations, and experiments all accord quite well.

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Section: Resultsmentioning

confidence: 99%

Broadband and high-efficient reflective linear-to-circular polarizer with Wi-Fi shaped metasurface

Tian¹,

Wang²,

He³

et al. 2022

J. Phys. D: Appl. Phys.

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“…More importantly, to the best of our knowledge, most of the current researches have investigated linear-to-circular PC and linear-to-linear PC. [19][20][21][22][23] There are few studies on circular-to-linear polarization converters. [24] As we all know, there will be 3.0 dB energy losses in the process of receiving and transmitting CP waves.…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Achieving Circular‐To‐Linear Polarization Conversion and Electromagnetically Induced Transparency by Utilizing a Metasurface

Gao

Zhang

2022

Annalen der Physik

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In this work, the simultaneous realization of circular-to-linear polarization conversion (PC) and electromagnetically induced transparency (EIT) is theoretically reported in terahertz (THz) range by utilizing a metasurface when left-handed circularly polarized (LCP) waves are incident. The metasurface is composed of two kinds of via-coupled modules (VCMs). Each module can realize the same EIT phenomenon by the destructive interference during the bright and dark modes due to the symmetry-broken rotation operation of the structure instead of the near-field coupling. The VCMs can simultaneously respond to the incident LCP waves and are identically converted into LCP and right-handed circularly polarized (RCP) waves, which own the same amplitudes and phase shifts. Therefore, the LCP and RCP waves can generate a resultant linearly polarized (LP) wave. The EIT transparent windows have emerged in 0.729-1.051 THz during the transmission of the LCP waves and the conversion of LCP to RCP. The values of maximum group delays both are 358 ps. The operating frequency band of the PC is located in 0.65-1.10 THz, and relative bandwidth reaches 51.4%. Optimal relative conversion efficiency reaches 93.2% at 0.921 THz. The EIT behavior has been investigated by the two-oscillator model to further confirm the consistency of the simulation results.

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“…[52] However, many current studies focus on linear-to-linear and linear-to-circular PC. [53,54] Studies about circular-to-linear PC also exist. [55,56] However, there are fewer circular-to-linear PCs that are insensitive to left-handed circularly polarized (LCP) and righthanded circularly polarized (RCP) waves.…”

Section: Introductionmentioning

confidence: 99%

Switchable Metasurface with Electromagnetically Induced Transparency and Absorption Simultaneously Realizing Circular Polarization‐Insensitive Circular‐to‐Linear Polarization Conversion

Gao

Zhang

2022

Annalen der Physik

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A metasurface (MS) with switching features from electromagnetically induced transparency (EIT) to electromagnetically induced absorption (EIA) is theoretically investigated in the terahertz (THz) range by incorporating vanadium dioxide (VO2) when circular polarization‐insensitive circularly polarized waves are incidents, which can also simultaneously realize circular‐to‐linear polarization conversion well. While the VO2 ring is in an insulator state, two new transparent EIT windows both are gained between 0.97 THz and 1.16 THz because of destructive interference between the two metal rings that are seen as bright modes. Once the VO2 ring is tuned to the metallic state, a perfect EIA phenomenon is observed between 0.824 THz and 1.233 THz, achieving the transition from the EIT to EIA behavior well. The received electromagnetic waves are radiated to left‐handed circularly polarized (LCP) or right‐handed circularly polarized (RCP) waves with identical phases and amplitudes through the radiation patches when the LCP or RCP ones are incident. Whereby, a resultant linearly polarized wave is obtained between 0.9 THz and 1.2 THz, and relative bandwidth reaches 29%. The outcomes of maximal group index and group delay both are 1934 and 488 ps at 1.08 THz, and maximal absorption is 90.3% at 1.06 THz.

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Ultra-wideband Linear-to-Circular Polarization Conversion Realized by an 8-shaped Metasurface

Cited by 13 publications

References 25 publications

Broadband and high-efficient reflective linear-to-circular polarizer with Wi-Fi shaped metasurface

Broadband and high-efficient reflective linear-to-circular polarizer with Wi-Fi shaped metasurface

Simultaneously Achieving Circular‐To‐Linear Polarization Conversion and Electromagnetically Induced Transparency by Utilizing a Metasurface

Switchable Metasurface with Electromagnetically Induced Transparency and Absorption Simultaneously Realizing Circular Polarization‐Insensitive Circular‐to‐Linear Polarization Conversion

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