Design of efficient terahertz antennas: Carbon nanotube versus gold

In this paper, by using scalability of equivalent circuit of single-wall carbon nanotube (SWNT) in its bundle structure, bundled carbon nanotube (CNT) are modeled by the macroscopic resistive sheet. The numerical simulation implements the boundary condition of the surface resistivity. An anisotropic resistive sheet model to represent bundled CNTs electromagnetically is presented. Then, a numerical simulation using method of moments (MoM) is developed to calculate radiation efficiencies of resonant strip antennas made up of bundled CNT and thin gold film. The radiation efficiencies are compared as a function of frequencies and number density of bundled CNT to find a crossover frequency where CNT antenna outperforms the thin gold film antenna.