Amplitude Modulator Design Using Series Graphene Transmission Lines in Terahertz Frequency Band

IF 2.1 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Nanotechnology Pub Date : 2024-04-05 DOI:10.1109/TNANO.2024.3385507

Saughar Jarchi

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Abstract

In this paper, a layered transmission line based on graphene is designed and investigated to provide amplitude modulation in the low terahertz frequency band. The proposed primary structure is composed of a graphene transmission line on a dielectric layer, as substrate, loaded by a transverse graphene strip and backed by a continuous graphene sheet, as ground plane. The intermediate graphene strip is electrically isolated from the input and output ports. The structure is first investigated by full-wave simulation method, with various chemical potentials of graphenes, and the ABCD matrices are extracted. Then, applying the analytical method based on the ABCD matrices, the scattering parameters of the cascade of several segments of the proposed primary transmission line are investigated, and the promising configuration for the amplitude modulator is derived. It is shown that, variations of signal transmission required by amplitude modulation performance are achieved by cascading six segments of the proposed transmission line and changing the chemical potential of graphene parts. The designed amplitude modulator is investigated, and high modulation depth of nearly 100% and flat response in 3.4–3.8 THz frequency band is achieved.

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利用太赫兹频段串联石墨烯传输线设计调幅器

本文设计并研究了一种基于石墨烯的分层传输线，用于在低太赫兹频段提供振幅调制。所提出的主要结构由介质层上的石墨烯传输线（作为基底）、横向石墨烯条带加载的石墨烯传输线和连续石墨烯片（作为地平面）支撑的石墨烯传输线组成。中间的石墨烯条与输入和输出端口电气隔离。首先用全波模拟法研究了石墨烯的各种化学势，并提取了 ABCD 矩阵。然后，应用基于 ABCD 矩阵的分析方法，研究了拟议主传输线若干段级联的散射参数，并得出了振幅调制器的理想配置。结果表明，通过级联六段拟议的传输线并改变石墨烯部分的化学势，可以实现调幅性能所需的信号传输变化。对所设计的振幅调制器进行了研究，结果表明在 3.4 至 3.8 太赫兹频段内，调制深度接近 100%，响应平坦。

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来源期刊

IEEE Transactions on Nanotechnology 工程技术-材料科学：综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

8.3 months

期刊介绍： The IEEE Transactions on Nanotechnology is devoted to the publication of manuscripts of archival value in the general area of nanotechnology, which is rapidly emerging as one of the fastest growing and most promising new technological developments for the next generation and beyond.