Abstract
We fabricated an optically transparent dipole antenna based on chemical vapor deposition (CVD)-grown monolayer graphene on an optically transparent quartz substrate and characterized its properties in microwave bands. The measurements of the reflection coefficients for the dipole antenna revealed that ∼90% of the microwave power transmitted to the CVD monolayer graphene of the antenna element. By measuring transmission coefficients, we demonstrated that the graphene dipole antenna radiated microwave power around the operational frequency (∼20.7 GHz). The operational frequency of the graphene dipole antenna (∼20.7 GHz) shifted to a higher frequency than that of the Au dipole antenna with the same structure (∼9.2 GHz), which suggests that monolayer graphene behaves not as a metal but as a dielectric material.
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