Substrate material plays an important role in controlling the performance and resonating frequency of graphene based nano patch antenna. The tunability characteristics of graphene based antenna using suitable dielectric materials for graphene based nano patch antenna design has been investigated in terms of return loss, bandwidth, gain, directivity and voltage standing wave ratio (VSWR). The simulation is carried out using high frequency structure simulator HFSS. The antenna has been designed to operate in the THz frequency band of (1-10THz) with the central frequency of 5.5THz. Six dielectric materials, Roger RT/duroid (εr =2.2), Gallium Arsenite (εr =12.9), Quartz (εr =3.78), Silicon dioxide (εr =4), FR-4 (εr =4.4) and Silicon nitrate (εr =7) were considered in this research work. Silicon dioxide attains maximum return loss value of -22.6358 dB with acceptable VSWR of 1.2848, and reasonable gain of 3.5221dB. With this result, it is observed that silicon dioxide is the suitable substrate material for the production of graphene based nano patch antenna for wireless applications. This result also suggests that the antenna operating frequency can be tuned over the THz band by using suitable substrate materials.
Keywards: graphene, nano-patch, bandwidth, substrate material, tunability characteristics