Low Insertion Loss Of 200 Mu M-Long Graphite Coplanar Waveguide

The graphene coplanar waveguide (CPW) has recently been found to have large insertion loss (typically larger than 50 dB/100 mu m), which mainly results from the large resistance of graphene. The poor radio-frequency transmission property of graphene hampers its application in interconnect, a low loss material is thus required. In this paper, low-resistance graphite CPWs with effective graphite length up to 200 mu m were fabricated. A record low insertion loss of graphite CPW (2.76 dB/100 mu m) is demonstrated, and the average insertion loss of our graphite CPWs is only similar to 1/5 of that of our monolayer graphene CPWs. Moreover, we find the insertion loss of graphite CPW may be even smaller at higher frequencies. Our investigation shows that graphite is a possible candidate for interconnect and may even be more applicable at ultra-high frequencies. (C) 2016 AIP Publishing LLC.