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Characterization of contact properties at interface between metal and graphene up to 15 GHz.
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  • Shohei Kosuga,
  • Ryosuke Suga,
  • Takeshi Watanabe,
  • Osamu Hashimoto,
  • Shinji Koh
Shohei Kosuga
Aoyama Gakuin University - Sagamihara Campus
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Ryosuke Suga
Aoyama Gakuin University - Sagamihara Campus
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Takeshi Watanabe
Aoyama Gakuin University - Sagamihara Campus
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Osamu Hashimoto
Aoyama Gakuin University - Sagamihara Campus
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Shinji Koh
Aoyama Gakuin University - Sagamihara Campus
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Abstract

The contact properties between metal and monolayer chemical vapor deposition (CVD) graphene were investigated, and coplanar waveguides (CPWs) composed of CVD graphene-based signal lines and Au-based ground lines were fabricated. The reflection coefficients of the CPWs were experimentally measured from 1 to 15 GHz. The contact properties were represented using the equivalent circuit model, which consists of paralell contact resistance Rc and paralell contact capacitance Cc. The calculated reflection coefficients of the model nearly agreed with the measured ones, which indicated that this model is suitable for analyzing the contact properties between metal and graphene up to 15 GHz. Bacause the impedance of Cc (|1/(ωCc )| = 4.8×10-3 Ω) is four orders of magnitude lower than that of Rc (50 Ω) at 15 GHz, the current flow is more capacitive and efficient than that in the DC band. The ratio of power consumption and power storage in the microwave band to the total power consumption in the DC band decreased with increasing frequency and incresing Cc. Therefore, higher Cc is preferable in designing microwave devices with a metal/graphene-based feeding structure, such as antennas and transmission lines.

Peer review status:UNDER REVIEW

09 Jun 2020Submitted to Engineering Reports
09 Jun 2020Submission Checks Completed
09 Jun 2020Assigned to Editor
11 Jun 2020Reviewer(s) Assigned
16 Jul 2020Editorial Decision: Revise Major
11 Sep 20201st Revision Received
11 Sep 2020Assigned to Editor
11 Sep 2020Submission Checks Completed
11 Sep 2020Reviewer(s) Assigned