X band tunable slot antenna with graphene patch

In this paper we present, for the first time, a X band slot antenna with a shorted graphene patch. The graphene patch is biased through the signal and ground of the coplanar waveguide feed. The change in the electric field determines a change of the impedance of the graphene sheet, leading to tuning of the antenna behavior. The 3D electromagnetic design and simulation will be presented. The structures were fabricated on high-resistivity silicon with a 0.3 μm thick silicon oxide layer and a single layer graphene sheet deposited by Graphenea. The experimental results are in good agreement with the simulations and show a tunability of over 20 dB in the minimum of the reflection losses and a 7.5 MHz frequency shift. The measured operating bandwidth (|S11| <; -10 dB) is between 9.3-10.435 GHz.