Characterization of contact properties at interface between metal and graphene up to 15 GHz
Abstract The contact properties between metal and monolayer chemical vapor deposition (CVD) graphene were investigated. Coplanar waveguides (CPWs) composed of CVD graphene‐based signal lines and Au‐based ground lines were fabricated. The S‐parameters of the CPWs were experimentally measured from 1 t...
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doaj-3c540883085943c3ab8641ccc208ddd02021-05-26T09:20:29ZengWileyEngineering Reports2577-81962021-05-0135n/an/a10.1002/eng2.12325Characterization of contact properties at interface between metal and graphene up to 15 GHzShohei Kosuga0Ryosuke Suga1Takeshi Watanabe2Osamu Hashimoto3Shinji Koh4Department of Electrical Engineering and Electronics, College of Science and Engineering Aoyama Gakuin University Sagamihara JapanDepartment of Electrical Engineering and Electronics, College of Science and Engineering Aoyama Gakuin University Sagamihara JapanDepartment of Electrical Engineering and Electronics, College of Science and Engineering Aoyama Gakuin University Sagamihara JapanDepartment of Electrical Engineering and Electronics, College of Science and Engineering Aoyama Gakuin University Sagamihara JapanDepartment of Electrical Engineering and Electronics, College of Science and Engineering Aoyama Gakuin University Sagamihara JapanAbstract The contact properties between metal and monolayer chemical vapor deposition (CVD) graphene were investigated. Coplanar waveguides (CPWs) composed of CVD graphene‐based signal lines and Au‐based ground lines were fabricated. The S‐parameters of the CPWs were experimentally measured from 1 to 15 GHz. The contact properties were analyzed using a lumped component‐based equivalent circuit model, which consists of the experimentally determined parallel contact resistance and the parallel contact capacitance. The calculated S‐parameters of the model roughly agreed with the measured ones, which indicated that the model was suitable for analyzing the contact properties between metal and graphene up to 15 GHz. Because the impedance of the contact capacitance (4.8 × 10−3 Ω) was four orders of magnitude lower than that of the contact resistance (50 Ω) at 15 GHz, the current flow was 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 increasing contact capacitance. Therefore, higher contact capacitance is preferable in designing microwave devices with a metal/graphene‐based feeding structure, such as antennas and transmission lines.https://doi.org/10.1002/eng2.12325contact propertiescoplanar waveguidegraphenemicrowaveoptically transparent antennas |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shohei Kosuga Ryosuke Suga Takeshi Watanabe Osamu Hashimoto Shinji Koh |
spellingShingle |
Shohei Kosuga Ryosuke Suga Takeshi Watanabe Osamu Hashimoto Shinji Koh Characterization of contact properties at interface between metal and graphene up to 15 GHz Engineering Reports contact properties coplanar waveguide graphene microwave optically transparent antennas |
author_facet |
Shohei Kosuga Ryosuke Suga Takeshi Watanabe Osamu Hashimoto Shinji Koh |
author_sort |
Shohei Kosuga |
title |
Characterization of contact properties at interface between metal and graphene up to 15 GHz |
title_short |
Characterization of contact properties at interface between metal and graphene up to 15 GHz |
title_full |
Characterization of contact properties at interface between metal and graphene up to 15 GHz |
title_fullStr |
Characterization of contact properties at interface between metal and graphene up to 15 GHz |
title_full_unstemmed |
Characterization of contact properties at interface between metal and graphene up to 15 GHz |
title_sort |
characterization of contact properties at interface between metal and graphene up to 15 ghz |
publisher |
Wiley |
series |
Engineering Reports |
issn |
2577-8196 |
publishDate |
2021-05-01 |
description |
Abstract The contact properties between metal and monolayer chemical vapor deposition (CVD) graphene were investigated. Coplanar waveguides (CPWs) composed of CVD graphene‐based signal lines and Au‐based ground lines were fabricated. The S‐parameters of the CPWs were experimentally measured from 1 to 15 GHz. The contact properties were analyzed using a lumped component‐based equivalent circuit model, which consists of the experimentally determined parallel contact resistance and the parallel contact capacitance. The calculated S‐parameters of the model roughly agreed with the measured ones, which indicated that the model was suitable for analyzing the contact properties between metal and graphene up to 15 GHz. Because the impedance of the contact capacitance (4.8 × 10−3 Ω) was four orders of magnitude lower than that of the contact resistance (50 Ω) at 15 GHz, the current flow was 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 increasing contact capacitance. Therefore, higher contact capacitance is preferable in designing microwave devices with a metal/graphene‐based feeding structure, such as antennas and transmission lines. |
topic |
contact properties coplanar waveguide graphene microwave optically transparent antennas |
url |
https://doi.org/10.1002/eng2.12325 |
work_keys_str_mv |
AT shoheikosuga characterizationofcontactpropertiesatinterfacebetweenmetalandgrapheneupto15ghz AT ryosukesuga characterizationofcontactpropertiesatinterfacebetweenmetalandgrapheneupto15ghz AT takeshiwatanabe characterizationofcontactpropertiesatinterfacebetweenmetalandgrapheneupto15ghz AT osamuhashimoto characterizationofcontactpropertiesatinterfacebetweenmetalandgrapheneupto15ghz AT shinjikoh characterizationofcontactpropertiesatinterfacebetweenmetalandgrapheneupto15ghz |
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