Field modeling and analysis of terahertz transistor

In this paper we have analyzed a terahertz transistor with both distributed and slice modeling and the results are compared with lumped model analysis. The transistor used in this analysis was reported in reference to have cutoff frequency greater than 1 THz based on extrapolated MSG/MAG figure which was derived from lumped model. However, analysis presented in this paper indicates that the cutoff frequency is well lower than 1 THz. S-parameter plots for distributed, slice and lumped models are presented and compared. In the distributed and slice modeling, elements of the passive section are calculated using finite difference method applied to the transistor structure. Moreover effect of loading in the electrodes of the transistor is studied.