Nano photonics is empowering the advancement of gadgets in a scale running from one to couple hundred of nanometers. Indeed, Graphene nanoantenna having nanoscale size to few micrometers enabling to operate at terahertz frequencies. Graphene is highly characterized by its surface conductivity which can be derived by using Kubo's formula. Furthermore, the scattering response of the supporting surface plasmon waves at terahertz region bring the best possible choice of nanoantenna dimensions. In this article, a graphene-based bowtie circular array antenna is proposed and analyzed at terahertz frequencies. The investigated array antenna having 8 radiating graphene unit cell arranged in circular array configuration and is designed on a stacked substrate by stacking silica on silicon having thickness of 70 nm and 50 nm respectively with the ground plane used as graphene sheet. Simulation results show that antenna has surface plasmon resonance (SPR) at infrared frequency 590 THz having S11 of -35 dB with better surface conductivity and high electron mobility. Various parametric results illustrate that the antenna has better gain and stable radiation patterns. The best achieved performance of the proposed graphene array antenna with better properties make it potential applicant for terahertz energy harvesting. CST studio (Computer Simulation Technology) is used for the simulation of the proposed antenna. © 2019 IEEE.