RF Loss Characteristics of Coplanar Waveguide Employing Chemically Modified Graphene on Flexible Substrates
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.
KeywordsRadio 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).
- 2.Y. Yun et al., A study on RF chracteristics of polyeher sulfone substrate for application to flexible mobile communication device, in Asia-Pacific Microwave Conference, Seoul, Republic of Korea, pp. 881–883Google Scholar
- 3.Y. Yun et al., RF characteristics of coplanar waveguide fabricated on flexible PES. Microw. J 56(2), 90–100 (2013)Google Scholar
- 9.J. Yu et al., Permittivity, thermal conductivity and thermal stability of poly(vinylidene fluoride)/graphene nanocomposites. IEEE Trans. Dielectr. Electr. Insul. 18(2), 478–484 (2012)Google Scholar
- 10.S.Y. Jeong et al., Highly concentrated and conductive reduced graphene oxide nanosheets by monovalent cation–pi interaction: toward printed electronics. Adv. Funct. Mater. 22, 3304–3314 (2012)Google Scholar
- 12.D.M. Pozar, Microwave Engineering (Addison- Wesley, Reading, 1990)Google Scholar