High-efficiency cross-polarization conversion metamaterial using spiral split-ring resonators

Yang, Tian; Liu, Xiaoming; Wang, Chen; Wang, Feilou; Zhou, Ji

doi:10.1063/5.0017809

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…As can be seen from In contrast with DSL and ELC, the resonance is considerably wider and enables broadband operation. Instead of absorption by dissipation, spiral structures perform a mode conversion into the cross-polarization, as described in [15]. Almost perfect conversion from TE to TM is implied by |Γ TM,TE | ≈ 1.…”

Section: B Polarization-rotating Unit Cell Designmentioning

confidence: 99%

Frequency Selective Surfaces for Reduced Specular Reflection under Oblique Incidence at 240 GHz

Brandl¹,

Diepolder²,

Mueh³

et al. 2023

2023 17th European Conference on Antennas and Propagation (EuCAP)

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As the alignment of a feed antenna to a steerable reflectarray becomes increasingly complicated at upper mm-wave frequencies, illuminating the structure from the far field is desirable. Simultaneously, the required fabrication precision makes large arrays expensive, effectively limiting the size. Consequently, spill-over feed radiation results in specular reflections, degrading the array's far-field pattern. To mitigate these undesired reflections, planar periodic structures can be employed to implement spatial filtering. Three designs that reduce specular reflections of a planar surface, caused by an obliquely-incident wave at 240 GHz, are proposed. Additional to standard evaluation of the absorptivity per unit cell, this paper examines the suppression mechanism by studying the scattered far field of size-limited structures. To verify each design, the frequency dependency of the specular reflection and the far-field pattern of a small array are measured. In accordance with simulations, two polarizationmaintaining variants feature 10 dB attenuation, whereas a modeconverting design achieves 23 dB.

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Section: B Polarization-rotating Unit Cell Designmentioning

confidence: 99%

Frequency Selective Surfaces for Reduced Specular Reflection under Oblique Incidence at 240 GHz

Brandl¹,

Diepolder²,

Mueh³

et al. 2023

2023 17th European Conference on Antennas and Propagation (EuCAP)

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show abstract

“…Moreover, the SRR's anisotropic structure enables polarization conversion. Spiral split ring resonators [8], S-shaped split ring resonators [9], twisted split ring resonators [10] are some such SRRs.…”

Section: Introductionmentioning

confidence: 99%

Dual Split Ring Resonator Based Reconfigurable Reflective Metasurface for Linear-to-linear Polarization Conversion

Neema,

Krishna

2024

PIER M

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A metasurface that can be reconfigured for the conversion of linear-to-linear polarization has been designed, fabricated, and verified. It consists of dual co-centric split-ring resonators (SRRs), each of which has a pair of splits. It is specifically engineered to function in two reflection modes, one with polarization conversion and the other without. The unit cell achieves reconfiguration by utilizing two PIN diodes. Conversion of linear polarization to its perpendicular counterpart is achieved while the diodes are in the OFF state. When the PIN diodes are turned ON, full reflection without polarization conversion occurs. The proposed meta-surface operates over the 6.03-10.5 GHz frequency range. A 42 × 42 unit cell array is fabricated, and the results are experimentally verified. An FR4 substrate is used with copper ground plane on one side. The polarization conversion is measured and compared with simulation results for various incident angles. A Polarization Conversion Ratio (PCR) of ≥ 90% is achieved for incident angles up to 30 • , with simulation and measured results showing good agreement.

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“…However, a significant limitation of existing AT MMs is their reliance on polarization conversion to achieve asymmetric transmission [9,15,[18][19][20][21]. This poses challenges for their integration into optical and microwave communication systems due to the complexity and potential signal losses introduced by polarization conversion.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric transmission for linearly polarized terahertz waves without polarization conversion

Yang,

Fang,

et al. 2024

Phys. Scr.

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In this study, a novel metamaterial (MM) architecture is presented, which comprises cut wires and split-ring resonators (SRRs) and demonstrates asymmetric transmission characteristics. Unlike previously reported multi-layer chiral structures, spatial asymmetry is introduced by aligning the cut wires and SRRs with the propagation direction of electromagnetic waves. This innovative alignment effectively disrupts time-reversal symmetry, enabling asymmetric transmission. A thorough analysis of the electromagnetic field distribution and surface current patterns offers insights into the fundamental mechanisms underlying this asymmetric transmission. Notably, the ability of this MM design to maintain the polarization state of transmitted waves positions it as a promising candidate for terahertz systems applications.

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High-efficiency cross-polarization conversion metamaterial using spiral split-ring resonators

Cited by 11 publications

References 30 publications

Frequency Selective Surfaces for Reduced Specular Reflection under Oblique Incidence at 240 GHz

Frequency Selective Surfaces for Reduced Specular Reflection under Oblique Incidence at 240 GHz

Dual Split Ring Resonator Based Reconfigurable Reflective Metasurface for Linear-to-linear Polarization Conversion

Asymmetric transmission for linearly polarized terahertz waves without polarization conversion

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