Reconfigurable THz Yagi antenna based on hybrid graphene-metal layout

Radwan, Ahmed; D’Amico, M.; Gentili, Gian Guido

doi:10.1109/lapc.2014.6996483

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…Graphene-based Yagi-Uda antennas [85,117,149,[160][161][162] are a common research topic for various high-gain applications. The main focus herein lies in the THz frequency range where the plasmonic effects occur, and dynamic tunability is facilitated.…”

Section: Yagi-uda Antennasmentioning

confidence: 99%

Review of graphene for the generation, manipulation, and detection of electromagnetic fields from microwave to terahertz

et al. 2022

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Graphene has attracted considerable attention ever since the discovery of its unprecedented properties, including its extraordinary and tunable electronic and optical properties. In particular, applications within the microwave to terahertz frequency spectrum can benefit from graphene’s high electrical conductivity, mechanical flexibility and robustness, transparency, support of surface-plasmon-polaritons, and the possibility of dynamic tunability with direct current to light sources. This review aims to provide an in-depth analysis of current trends, challenges, and prospects within the research areas of generating, manipulating, and detecting electromagnetic fields using graphene-based devices that operate from microwave to terahertz frequencies. The properties of and models describing graphene are reviewed first, notably those of importance to electromagnetic applications. State-of-the-art graphene-based antennas, such as resonant and leaky-wave antennas, are discussed next. A critical evaluation of the performance and limitations within each particular technology is given. Graphene-based metasurfaces and devices used to manipulate electromagnetic fields, e.g., wavefront engineering, are then examined. Lastly, the state-of-the-art of detecting electromagnetic fields using graphene-based devices is discussed.

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Section: Yagi-uda Antennasmentioning

confidence: 99%

Review of graphene for the generation, manipulation, and detection of electromagnetic fields from microwave to terahertz

et al. 2022

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“…The first term (intraband term) dominates the value of total conductivity in the range of frequency below 5 THz, whereas the second term (interband term) has no significant effect on the total surface conductivity within this band (see Figure 1(a)). [25]. where h is the substrate thickness and ε r the relative permittivity of the substrate.…”

Section: Modelling Of Complex Surface Properties Of Graphenementioning

confidence: 99%

The Performance Improvement of THZ Antenna via Modeling and Characterization of Doped Graphene

Gatte¹,

Soh²,

Rahim³

et al. 2016

PIER M

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Abstract-The improvement of Terahertz (THz) antenna requires efficient (nano)materials to operate within the millimeter wave and THz spectrum. In this paper, doped graphene is used to improve the performance of two types of patch antennas, a rectangular and an elliptical antenna. The surface conductivity of conventional (non-doped) graphene is first modeled prior to the design and simulation of the two graphene based antennas in an electromagnetic solver. Next, different graphene models and their corresponding surface conductivities are computed based on different bias voltages or chemical doping. These configurations are then benchmarked against a similar antenna based on conventional metallic (copper) conductor to quantify their levels of performance improvement. The graphene based antennas showed significant improvements for most parameters of antenna than that of the conventional antenna. Besides that, the higher chemical potentials resulting from higher biasing voltages also resulted in this trend. Finally, the elliptical patch graphene antenna indicated better reflection performance, radiation efficiency and gain than a rectangular patch operating at the same resonant frequency.

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“…These initial findings are particularly promising for future THz applications, especially THz antenna arrays. Radwan et al demonstrated a tunable THz radiation band antenna, whose resonance frequency and bandwidth can be changed by the applied voltage [27]. The proposed structure offers a wider operational bandwidth and a better match between the photomixer and the antenna.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a PDLC-Based Reconfigurable Hilbert Fractal Antenna for Large and Fine THz Frequency Tuning

Garu

Wang

2022

Micromachines

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The proposed reconfigurable radiating antenna design is based on the integration of a reconfigurable fractal antenna and electro-optic substrate material. This antenna can be adjusted to achieve either re-configurability or tunability in the desired frequency range for wireless systems. The electromagnetic characteristics of the fractal antenna are manipulated at both the level of fractal geometry, electrical length and dielectric substrate. The designed antenna features multiband responses, in which the geometry and length change create a large frequency shift and the dielectric change using polymer dispersed liquid crystal (PDLC) creates fine and/or continuous tuning. The far field and scattering properties of the antenna are analyzed using the Computer Simulation Technology (CST) Microwave Studio Suite. The proposed approach has successfully demonstrated reconfigurable switching for up to four frequency bands between 0.2 and 0.6 THz. The dielectric constant change in the PDLC substrate shows fine and continuous frequency tuning with an 8% maximum frequency shift when operating around 0.54 THz and a high directivity of 7.35 dBi at 0.54 THz and 8.43 dBi at 0.504 THz. The antenna can also realize a peak gain of 4.29 dBi at 0.504 THz in the extraordinary polarization state of PDLC. The designed antenna can be readily integrated in the current communication devices, such as satellites, smart phones, laptops, and other portable electronic devices, due to its compact geometry and IC compatible design. In satellite applications, the proposed antenna can play a significant role in terms of security. The antenna could be extremely useful for satellites that want to keep their information secret; by constantly switching their operating frequency, spy satellites can evade detection and data collection from enemy ears.

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Reconfigurable THz Yagi antenna based on hybrid graphene-metal layout

Cited by 8 publications

References 9 publications

Review of graphene for the generation, manipulation, and detection of electromagnetic fields from microwave to terahertz

Review of graphene for the generation, manipulation, and detection of electromagnetic fields from microwave to terahertz

The Performance Improvement of THZ Antenna via Modeling and Characterization of Doped Graphene

Design and Analysis of a PDLC-Based Reconfigurable Hilbert Fractal Antenna for Large and Fine THz Frequency Tuning

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