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We fabricated an optically transparent monopole antenna using graphene film and investigated the feasibility of the film as an electrode material for antennas. A low sheet resistance (80 Ω/sq) was attained by stacking the graphene films and carrier doping with an ionic liquid. The optical transmittance of the carrier-doped three-layer stacked graphene film was greater than 90%, enabling it to be embedded in highly transparent objects without altering their landscape. Using the monopole antenna structure with a metal ground plane, we measured the reflection and radiation characteristics of the graphene monopole antenna, excluding the contribution from the power feeding components. The radiation efficiency of the graphene monopole antenna, which was measured by the Wheeler cap method, was determined to be 52.5% at 9.8 GHz. Through the measurements of the graphene monopole antenna, we demonstrated that the carrier-doped three-layer stacked graphene film can be used as an electrode material for optically transparent antennas. [ABSTRACT FROM AUTHOR]

The radiation properties of a graphene‐based optically transparent half‐wavelength dipole antenna in microwave bands was investigated. The resonance frequencies of a reference Au antenna and a graphene antenna having the same antenna structures were 9.5 and 21.6 GHz, respectively, owing to the difference in conductivity. Despite the low conductivity of graphene, the gain of the graphene antenna was 1 dB higher than that of the Au antenna. We also showed the feasibility of using graphene‐based optically transparent antenna through the measurements of transmission characteristics between two graphene antenna. [ABSTRACT FROM AUTHOR]