Frequency Tunable Graphene Metamaterial Reflectarray

Zainud-Deen, S.H.; Mabrouk, Ahmed M.

doi:10.1007/s11277-018-5884-1

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…However, the current trend in metasurface development has elevated the need for cross-spectrum 18 , 19 applications, raising the demand for reconfigurable and tunable metasurfaces. Commonly used materials, including graphene 20 and VO2, 21 change the operational frequency, amplitude, and phase of electromagnetic waves through various external stimuli, creating numerous tunable devices such as photonic switches, 22 absorbers, 23 and polarizers 24 . However, the drawbacks of these materials, such as low stability, complex preparation process, and high cost, 25 have hindered their practical applications in constructing tunable metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional terahertz metasurface switch based on nematic liquid crystals for cross-spectrum applications

Deng,

Kou,

Zhang

et al. 2024

Opt. Eng.

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We present a design of a fully electrically tunable metasurface switch based on nematic liquid crystal (LC). By applying different voltages on adjacent gratings of the interdigitated electrodes, the dielectric constant of the LC material and the responses of the proposed metasurface can be arbitrarily tuned. The experimental results reveal a reflective switch action in the structure across a frequency range of 106.80 to 114.15 GHz. The maximum operational frequency bandwidth is 7%, and the highest switch contrast ratio achieved is 0.77. Moreover, the suggested structure demonstrates multifunctional switching capability, manifesting a transmissive switching effect in the frequency range of 340.75 to 345.13 GHz. The measured switch contrast ratio reaches a maximum of 0.71. Combining the advantages of multifunctionality and cross-spectrum application, we provide an innovative approach for developing switches intended for terahertz wave communication systems.

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Section: Introductionmentioning

confidence: 99%

Multifunctional terahertz metasurface switch based on nematic liquid crystals for cross-spectrum applications

Deng,

Kou,

Zhang

et al. 2024

Opt. Eng.

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“…To meet this challenge, a sensing approach that focuses on the resonance frequency shift in radio waves has been investigated. The sensor uses a split-ring resonator (SRR), ,, a metamaterial used, e.g., for near-field communications, − and it has a radio wave reflection function, − but it is used at short sensing distances, or its resonance frequency exceeds 5 GHz . Although there is a simple SRR reflection measurement system, the SRRs are not made from edible materials. , …”

Section: Introductionmentioning

confidence: 99%

Thermally Degradable Split-Ring Resonator Made on a Gelatin Substrate with Enhanced Dielectric and Conductive Properties

Fukada

Tajima

Hayashi

2023

ACS Appl. Electron. Mater.

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Ingestible electronics, taken orally for monitoring organs, bacteria, and cells, are innovative wireless diagnostic and therapeutic technologies. Whereas residual in-body devices may require surgical removal, food-based sensors are seen as a way of ensuring safety. This study reports a split-ring resonator (SRR) whose resonance can be observed wirelessly. It is fabricated on a thermoresponsive gelatin substrate with a collaged edible metal leaf. Gelatin is a highly water-absorbing material, which may affect the resonator performance. According to high-frequency structural simulations, this resonator requires a low dielectric loss, <0.05, and high conductivity, >106 S/m. We found that these targets were achieved by completely drying the gelatin film and transferring multiple stacked metal leaves onto the film. Thin metal sheets were glued using an oleogel made of beeswax and olive oil, and the use of a hydrophobic material also aided in the transfer. Thus, we gained insights into the criteria for fabricating transient resonators with thermodegradability. SRRs made with edible materials are a technology that works in harmony with people and the environment and could lead to wireless devices or micromachines for the healthcare, agriculture, and livestock industries.

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“…However, fxed and rotating devices are required to control antenna deformation through mechanical rotation, which is limited by cost and application. Zainud-Deen et al [20,21] have done a lot of work in reconfgurable antennas and antenna arrays.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Polarized Reconfigurable Plasma Antenna Array

Sun,

Zhou,

Tan

et al. 2023

International Journal of Antennas and Propagation

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Research on antenna reconfiguration is important in antenna applications. We present design of a multi-polarized plasma antenna with 40.68 MHz radio frequency (RF) power supplies and several discharge tubes filled with argon (neon) and mercury. Furthermore, self-made regulating circuits among the vibrators are introduced for the antenna array system. It can not only make the length of the dipole controllable but also improve the antenna gain and circular polarization (CP) performance under different lengths. Antenna arrays can be classified into linear and circular polarization by quickly adjusting the phase difference between vibrators. Both the experimental and simulation results indicate that the plasma antenna can realize impedance, pattern, and polarization reconstruction expediently. In addition, the linear polarization (LP) and CP can be transformed into each other quickly by adjusting the discharge conditions and regulating circuits. Moreover, compared with a symmetrical cross vibrator plasma antenna and a metal antenna of the same size, the proposed antenna array shows a certain gain and good reconfigurable performance within the frequency band of 150–250 MHz.

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Frequency Tunable Graphene Metamaterial Reflectarray

Cited by 15 publications

References 9 publications

Multifunctional terahertz metasurface switch based on nematic liquid crystals for cross-spectrum applications

Multifunctional terahertz metasurface switch based on nematic liquid crystals for cross-spectrum applications

Thermally Degradable Split-Ring Resonator Made on a Gelatin Substrate with Enhanced Dielectric and Conductive Properties

A Multi-Polarized Reconfigurable Plasma Antenna Array

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