Performance Analysis of Plasmonic Nano-antenna Based on Graphene with Different Dielectric Substrate Materials for Optoelectronics Application

The graphene-based plasmonic antenna’s operating frequency and performance are significantly controlled by the substrate dielectric material. In this article, a plasmonic microstrip antenna is designed and simulated for terahertz applications. The design procedure is performed by testing different dielectric substrate materials of the same thickness, such as RT5800, polyimide, quartz, silicon dioxide (SiO 2 ), FR4, mica, silicon nitride (SiO 3 N 4 ), and gallium arsenide (GaAs). Generally, the computed results reveal that the quartz substrate maintains suitable radiation performance with a minimum S11 values of − 45.67 dB, efficiency of 92.65%, gain of about 3.15 dB, and bandwidth values of 310 GHz. Furthermore, a modification is done in the antenna by increasing the substrate height to obtain tri-band radiation mode. The results indicate that the proposed antenna operates at tri-band frequencies when the substrate thickness is larger than 6 µm. However, a better antenna radiation performance is observed with a substrate thickness of 7 µm which operates at frequencies of 0.766, 3.285, and 4.510 THz. Additionally, the overall radiation performance obtained for the proposed antennas of a single band frequency with quartz and dual and triple band frequencies with GaAs is compared with previous study results done by other researchers and a reliable agreement with an advancement in present work, especially in terms of antenna size and bandwidth. Finally, it can be said that the implementation of a graphene patch conductor to develop milt-band resonance frequency is an easy technique with low profiles, simple and alternative to the implementing conducting material slots, or extensions along the patch radiating borders techniques.