  This paper presents an efficient approach for exciting a dielectric resonator
antenna (DRA) in the terahertz frequencies by means of a graphene plasmonic
dipole. Design and analysis are performed in two steps. First, the propagation
properties of hybrid plasmonic onedimensional and two-dimensional structures
are obtained by using transfer matrix theory and the finite-element method. The
coupling amount between the plasmonic graphene mode and the dielectric wave
mode is explored based on different parameters. These results, together with
DRA and plasmonic antenna theory, are then used to design a DRA antenna that
supports the $TE_{y}^{112}$ mode at 2.4 THz and achieves a gain (IEEE) of up to
7 dBi and a radiation efficiency of up 70%. This gain is 6.5 dB higher than
that of the graphene dipole alone and achieved with a moderate area overhead,
demonstrating the value of the proposed structure.
