Multiband Terahertz Self-Complementary Metasurface

Kim, Se‐Mi; Leite, Celso Martines; Park, Juyeong; Kim, Hyo-Jeong; Jang, Jae‐Hyung

doi:10.1109/access.2020.3034120

Cited by 12 publications

(5 citation statements)

References 47 publications

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“…Specifically, these hybrid unit-cells can consist of different resonators at each layer including, (a) single printed circuits, such as rectangular patches, with a complexity level M equivalent to the single-element unit-cell design, (b) single printed circuits with a complexity level exceeding M , for example, a Jerusalem cross (e.g., Ref. 41 ) compared to a rectangular patch, or (c) multiple printed circuits with a complexity level exceeding M , such as a split-ring resonator (e.g., Ref. 42 ) compared to a rectangular patch.…”

Section: Theorymentioning

confidence: 99%

An ultra-fast method for designing holographic phase shifting surfaces

Biswas,

Zekios,

Georgakopoulos

2023

Sci Rep

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Holographic phase-shifting surfaces (PSSs) have been proven to offer a cost-effective solution for enabling passive arrays to mechanically steer their beams toward desired directions. However, even though the principle of operation of PSSs is straightforward, designing a PSS is very challenging, because it involves an extremely high computational time, which in turn limits their usage and development. Notably, traditional design approaches of PSSs, with N number of layers that have M different variations of conductive patches, need $$M^N$$ M N full-wave simulations to be properly characterized. To address these challenges that are associated with the design of PSSs and reduce the needed computational effort, we present here a semi-numerical approach that enables the efficient design of holographic PSSs. Specifically, by representing an N-layer PSS unit-cell as N cascaded networks, where each network represents one layer of the PSS that has M different designs of sub-wavelength resonators, we only need to conduct $$N \times M$$ N × M full-wave simulations to collect all the required data needed to analyze the performance of the PSS. In turn, by utilizing the multiplication property of ABCD parameters we can evaluate very efficiently all the $$M^N$$ M N different combinations that characterize our PSS. To validate the accuracy of our design methodology, a 1-D beam steerable antenna system is designed that is comprised of a circularly polarized holographic metasurface antenna (HMA) and a hybrid PSS, both operating at 30 GHz. Comparisons between our semi-numerical results, full-wave simulations, and measurements demonstrate an angular error of less than $$0.7^{\circ }$$ 0 . 7 ∘ .

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Section: Theorymentioning

confidence: 99%

An ultra-fast method for designing holographic phase shifting surfaces

Biswas,

Zekios,

Georgakopoulos

2023

Sci Rep

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“…This article focuses on the design, analysis, and simulation of a multi-band reconfigurable metasurface filter, considering its crucial role in various telecommunication systems 46 . In previous studies different structures have been proposed utilizing frequency selective surfaces (FSS) 47 , metasurfaces [48][49][50] , and graphene-based devices 51,52 across a wide range of frequencies from microwave to optical regimes. One of the key challenges is the need for filters that can operate across multiple frequency bands, as this is a vital attribute for accommodating the diverse communication needs of 6G systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Reconfigurable Multi-passband Metasurface Filters Designed by Deep Neural Networks for 6G Applications

Jamshidiha,

Abdipour,

Askarpour

2024

Preprint

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This article proposes a comprehensive guide to simplify the design procedure a multi-layer double passband metasurface filter. An inverse design model is used to estimate the geometrical dimensions, and the filter is studied in 6G frequency bands. Generalized sheet transition boundary conditions (GSTCs) are used to explain the effects of various parameters on the frequency response and to determine resonance type in the reflection spectrum. The equivalent circuit method is explored to understand the filter functionality, and vanadium dioxide (VO2) is incorporated to adjust filter characteristics, enhance the bandwidth, and coverage of a new band in 6G.

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“…Hence, polarization selective excitation of resonances can be achieved. The multi-narrow band resonances can be utilized in applications such as multivariate sensing [33], multispectral filtering [34], multiband absorber [35] and multiband harmonic generation [36]. It should be noted that ultra-high Q resonances significantly depend on the degree of asymmetry [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Multispectral tunable symmetry-protected bound states in the continuum in all-dielectric split-ring resonator metasurfaces

Sharma

Lahiri

Varshney

2023

J. Phys. D: Appl. Phys.

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Symmetry incompatible bound states in the continuum (BICs) are the non-radiating states that remain decoupled from the radiation continuum due to the symmetry mismatch. However, it has always been challenging to observe multiple symmetry-protected BICs in single resonator dielectric metasurfaces. This work reports multiple symmetry-protected BICs for both linear polarizations in all-dielectric metasurfaces made up of split-ring resonators (SRRs). Intensive numerical simulations predict that SRR can support a high-quality factor (Q) of 106 for standalone and with substrate in presence of asymmetry. However, for a realistic and practical scenario, a Q-factor of ∼ 8000 for standalone structures is achieved, which reduces by a factor of 1.25 in the presence of silica substrate. Even if the out-of-plane asymmetry is introduced either in the geometry or variation in the angle of incidence, BICs are transformed into quasi-BICs possessing Fano resonance. Eigenmode and multipole decomposition analysis confirm multiple BIC resonances; notable dominant contributions are from magnetic dipole, toroidal dipole, and electric and magnetic quadrupole. Integrating monolayer graphene adds tunability to the metasurface, where distinct quasi-BIC modes can be employed to facilitate an excellent switching.

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Multiband Terahertz Self-Complementary Metasurface

Cited by 12 publications

References 47 publications

An ultra-fast method for designing holographic phase shifting surfaces

An ultra-fast method for designing holographic phase shifting surfaces

Analysis of Reconfigurable Multi-passband Metasurface Filters Designed by Deep Neural Networks for 6G Applications

Multispectral tunable symmetry-protected bound states in the continuum in all-dielectric split-ring resonator metasurfaces

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