A Broadband Tunable Coaxial Attenuator Based on Graphene

Hui Chen; Zhen Guo Liu; Wei Bing Lu; An Qi Zhang; Hao Chen

doi:10.1109/ACCESS.2019.2937835

IEEE Access (Jan 2019)

A Broadband Tunable Coaxial Attenuator Based on Graphene

Hui Chen,
Zhen Guo Liu,
Wei Bing Lu,
An Qi Zhang,
Hao Chen

Affiliations

Hui Chen: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, China
Zhen Guo Liu: ORCiD; State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, China
Wei Bing Lu: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, China
An Qi Zhang: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, China
Hao Chen: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, China

DOI: https://doi.org/10.1109/ACCESS.2019.2937835
Journal volume & issue: Vol. 7
pp. 127593 – 127599

Abstract

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A dynamically tunable coaxial attenuator based on graphene is presented in this paper. The attenuator is achieved by inserting a graphene sandwich structure (GSS) inside the dielectric of coaxial line along the propagation direction of electromagnetic waves to dissipate the electromagnetic field. The mechanism of attenuator is theoretically analyzed, and an approximate formula to calculate attenuation with different parameters is proposed. We experimentally demonstrate that attenuation of the attenuator can be tuned from 3 dB to 14.5 dB with good flatness in broad operation frequency from 2 GHz to 9 GHz when graphene impedance is changed by different bias voltage. The theoretical calculation and simulation results have a good agreement with experimental results, while the $\vert S_{11}\vert $ can always remain low level under -15 dB.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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