The Graphene Base Transistor (GBT) is a very promising device concept for analog applications. The device operates similar to the hot electron transistor and exploits the high carrier mobility of graphene to reduce the base resistance that limits the unity power gain frequency (fmax) and the noise figure (NF) of RF devices. Although the DC functionality of the GBT has been experimentally demonstrated, at present RF performance can be investigated by simulations only. In this paper, we predict

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... e DC current and the cutoff frequency of different GBT designs (including dimensions and various materials), with the aim to optimize the GBT structure and to achieve THz operation. In particular, optimized emitter/dielectrics combinations are proposed to maximize RF figures of merit.