RF Loss Characteristics of Coplanar Waveguide Employing Chemically Modified Graphene on Flexible Substrates

  • Hyun-Soo Oh
  • Young Yun
  • Sooyeon Jeong
  • Seung Yol Jeong
  • Hong Seung Kim
Regular Paper


In this work, a coplanar waveguide employing chemically modified graphene was fabricated on a polyethylene terephthalate (PET) substrate and its RF loss characteristics were investigated. According to the results, the coplanar waveguide showed much lower loss characteristics than conventional graphene-based transmission line. The insertion loss of conventional graphene/Si structure was – 24 to − 33 dB at 1 GHz, but that of the graphene/PET structure was − 0.773 dB at the same frequency. However, the graphene/PET structure showed a comparatively higher loss than the gold–Ti/PES structure. The higher loss of the graphene/PET structure originated from the comparatively lower conductivity of graphene. The results of the present study indicate that the graphene/PET structure is prospective for application in flexible RF devices.


Radio frequency Loss Coplanar waveguide Graphene Flexible substrate 



This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2014R1A2A1A11049844) and by Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2016M3A7B4021151).


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Copyright information

© The Korean Institute of Electrical and Electronic Material Engineers 2018

Authors and Affiliations

  1. 1.Department of Radio Communication and EngineeringKorea Maritime and Ocean UniversityBusanKorea
  2. 2.Nano Hybrid Technology Research CenterKorea Electrotechnology Research Institute (KERI)ChangwonKorea
  3. 3.Department of Electro Functionality Materials EngineeringUniversity of Science and Technology (UST)DaejonKorea
  4. 4.Department of Electrical and Electronics EngineeringKorea Maritime and Ocean UniversityBusanKorea

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