DESIGN OF NOVEL SSR BASED OCTAGONAL SHAPE RADIATOR FOR TERAHERTZ APPLICATION

Abstract

Antennas that possess a larger gain and efficient across a wider frequency range are more beneficial. Reaching these qualities at greater frequencies while preserving a compact size makes the design more complex. A novel square split ring (SSR) octagonal shaped radiator suitable for metamaterial structure is proposed. The Rogers substrate with dielectric constant of 2.2, 0.8mm thickness and 0.00009 loss tangent is used in the design. The size of the SSR is 2.0 by 2.0mm 2 and the total size of the unit cell is 2.4 by 2.4 mm 2. The electromagnetic characteristics of this antenna in terms of S11 and S12 are compared. The CST MICROWAVE STUDIO which is commercially available software (electromagnetic simulator) that operate on Finite-Difference Time-Domain (FDTD) method was used to simulate the unit cell. The antenna's performance is visualise from reflection coefficient (S11 and S12), permittivity and permeability. The simulation results shows that the unit cell have reflection coefficient between -10dB and -35dB at 190GHz to 300GHz, at 210 GHz and 255 GHz for x-direction and for y direction at 219 GHz and 290 GHz resonator creates an effective stop-band, also the designed radiator has a near zero permeability and permittivity. These results make it suitable for design of metamaterial antenna for Terahertz application.