Radiation Efficiency Enhancement of Graphene THz Antennas Utilizing Metamaterial Substrates

Amanatiadis, Stamatios; Karamanos, Theodosios D.; Kantartzis, Nikolaos V.

doi:10.1109/lawp.2017.2695521

Cited by 43 publications

(21 citation statements)

References 18 publications

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“…The carrier lifetimes of the smooth-, fine-, and coarse-textured InP semiconductors are found as respective values of 200 ± 6, 100 ± 10, and 20 ± 3 ps when measured with a pump-probe experimental system [66]. In 2017, Amanatiadis et al showed a graphene plasmonic antenna via synthesized substrates with metamaterial resonators, whose radiation efficiency is calculated at 16.6%, more than four times higher compared to the 3.9% of the usual antenna [67]. In 2018, Gupta et al reported several factors of enhancement in THz emission efficiency from conventional antennas.…”

Section: Optimization Of Thz Systemmentioning

confidence: 99%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

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With the non-ionizing, non-invasive, high penetration, high resolution and spectral fingerprinting features of terahertz (THz) wave, THz spectroscopy has great potential for the qualitative and quantitative identification of key substances in biomedical field, such as the early diagnosis of cancer, the accurate boundary determination of pathological tissue and non-destructive detection of superficial tissue. However, biological samples usually contain various of substances (such as water, proteins, fat and fiber), resulting in the signal-to-noise ratio (SNR) for the absorption peaks of target substances are very small and then the target substances are hard to be identified. Here, we present recent works for the SNR improvement of THz signal. These works include the usage of attenuated total reflection (ATR) spectroscopy, the fabrication of sample-sensitive metamaterials, the utilization of different agents (including contrast agents, optical clearing agents and aptamers), the application of reconstruction algorithms and the optimization of THz spectroscopy system. These methods have been proven to be effective theoretically, but only few of them have been applied into actual usage. We also analyze the reasons and summarize the advantages and disadvantages of each method. At last, we present the prospective application of THz spectroscopy in biomedical field.

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Section: Optimization Of Thz Systemmentioning

confidence: 99%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

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“…To handle the mentioned handicaps, some new techniques have been presented in the literature to enhance the MPA . So, one method of designing high‐performance antennas is to use antenna applications together with metamaterials …”

Section: Introductionmentioning

confidence: 99%

“…2,3 So, one method of designing high-performance antennas is to use antenna applications together with metamaterials. [4][5][6] In recent years, MMs have attracted extensive research interests in the field of electromagnetics and optical systems due to their unnatural negative refractive properties. 7 Because of these negative refraction properties, MMs can be grouped into three groups.…”

Section: Introductionmentioning

confidence: 99%

Gain enhancement of microstrip antenna with a novel DNG material

Urul

2020

Micro & Optical Tech Letters

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In this study, a novel double‐negative compact metamaterial (MM) that can operate in Ku‐band (12 GHz) is designed and fabricated. It is shown that the proposed structure can be used as a MM for a wide bandwidth of 6 GHz. A double electromagnetic lens layer is then formed using this MM unit cell in an array. Afterwards, obtained lens layers are used together with a conventional microstrip patch antenna (CMPA) operating at 12 GHz. The effect of the MM on the antenna gain and directivity is examined. The CMPA and MMs are fabricated, and measurements are performed in Akdeniz University Microwave Laboratory and simulated with Microwave Studio by Computer Simulation Technology. 71% and 50% improvement in antenna gain and directivity are obtained by using it as a double MM lens layer.

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“…Consequently, a considerable amount of papers were published to show the theoretical results of graphene-based antennas [10][11][12]. Recently, a graphene-based antenna with a metamaterial substrate [13] and a few-layer (less than six) graphene antenna [14] were proposed for high radiation efficiency. Interested readers are encouraged to refer to the review article [15] for more details on the state of the art of the graphene-based THz antennas.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Resonant Circuit Modeling of a Graphene-Based Bowtie Antenna

Zhang

Liu

et al. 2018

Electronics

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The resonance performance analysis of graphene antennas is a challenging problem for full-wave electromagnetic simulators due to the trade-off between the computer resource and the accuracy of results. In this paper, an equivalent circuit model is presented to provide a concise and fast way to analyze the graphene-based THz bowtie antenna. Based on the simulated results of the frequency responses of the antenna, a suitable equivalent circuit of Resistor-Inductor-Capacitor (RLC) series is proposed to describe the antenna. Then the RLC parameters are extracted by considering the graphene bowtie antenna as a one-port resonator. Parametric analyses, including chemical potential, arm length, relaxation time, and substrate thickness, are presented based on the proposed equivalent circuit model. Antenna input resistance R is a significant parameter in this model. Validation is performed by comparing the calculated R values with the ones from full-wave simulation. By applying different parameters to the graphene bowtie antenna, a set of R, L, and C values are obtained and analyzed comprehensively. A very good agreement is observed between the equivalent model and the numerical simulation. This work sheds light on the graphene-based bowtie antenna’s initial design and paves the way for future research and applications.

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Radiation Efficiency Enhancement of Graphene THz Antennas Utilizing Metamaterial Substrates

Cited by 43 publications

References 18 publications

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Gain enhancement of microstrip antenna with a novel DNG material

Equivalent Resonant Circuit Modeling of a Graphene-Based Bowtie Antenna

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